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ICs for Communications
ISDN DC Converter Circuit IDCC PEB 2023 Version 1.1 PEF 2023 Version 1.1
Data Sheet 08.97
DS 2
PEB 2023 PEF 2023 Revision History: Previous Releases: Page all Pages 21 22 22 22 23
Original Version:
Data Sheet 08.97 Data Sheet 02.97
Subjects (changes since last revision) Additional to the normal temperature range devices PEB 2023 also the extended temperature range devices PEF 2023 are specified in this Data Sheet. The ambient temperature under bias is separately defined for PEB 2023 and PEF 2023. The maximum limit values for line regulation VREF Line and load regulation VREF Load are reduced. The typical values are adapted. The maximum limit value for voltage stability of fOSC is reduced. The typical value is adapted. The test condition ambient temperature range TA is extended for temperature stability of VREF and fOSC. The sense voltage VSense of the current limit comperator is separately defined for PEB 2023 and PEF 2023.
Edition 08.97 This edition was realized using the software system FrameMaker(R). Published by Siemens AG, HL TS, Balanstrae 73, 81541 Munchen (c) Siemens AG 08.1997. All Rights Reserved. Attention please! As far as patents or other rights of third parties are concerned, liability is only assumed for components, not for applications, processes and circuits implemented within components or assemblies. The information describes the type of component and shall not be considered as assured characteristics. Terms of delivery and rights to change design reserved. For questions on technology, delivery and prices please contact the Semiconductor Group Offices in Germany or the Siemens Companies and Representatives worldwide (see address list). Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Siemens Office, Semiconductor Group. Siemens AG is an approved CECC manufacturer. Packing Please use the recycling operators known to you. We can also help you - get in touch with your nearest sales office. By agreement we will take packing material back, if it is sorted. You must bear the costs of transport. For packing material that is returned to us unsorted or which we are not obliged to accept, we shall have to invoice you for any costs incurred. Components used in life-support devices or systems must be expressly authorized for such purpose! Critical components1 of the Semiconductor Group of Siemens AG, may only be used in life-support devices or systems2 with the express written approval of the Semiconductor Group of Siemens AG. 1 A critical component is a component used in a life-support device or system whose failure can reasonably be expected to cause the failure of that life-support device or system, or to affect its safety or effectiveness of that device or system. 2 Life support devices or systems are intended (a) to be implanted in the human body, or (b) to support and/or maintain and sustain human life. If they fail, it is reasonable to assume that the health of the user may be endangered.
PEB 2023 PEF 2023
Table of Contents 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 2 3 3.1 3.2 3.3 3.4 4 Page
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 System Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Surge Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Fast Input Undervoltage Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Functional Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Static Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Package Outlines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Semiconductor Group
3
08.97
PEB 2023 PEF 2023
Overview 1 Overview
The PEB/F 2023 is a pulse width modulator circuit designed for fixed-frequency switching regulators with very low power consumption. In telephone and ISDN-systems a high conversion yield is crucial to maintain functionality in all supply conditions via S- or U-interfaces. The PEB/F 2023 design and technology realizes high conversion efficiency and low power dissipation. The PEB/F 2023 is fully compatible with the ITU-power recommendations of the S-interface. For these reasons the PEB/F 2023 is especially suited for telephone and ISDNenvironments. Coupled with a few external components it can provide a stable 5V DC-supply for subscriber terminals (TE's) or network terminators (NT's). It can additionally be programmed for higher output voltages, e.g. to supply the S-lines. It should be recognized that the PEB/F 2023 can also be used in numerous DC/DCconversion systems other than ISDN-power supplies. For example, in a special supply voltage range the PEB/F 2023 can be supplied from a 12V battery.
For detailed technical information about "Processing Guidelines" and "Quality Assurance" for ICs, see our "Product Overview".
Semiconductor Group
4
08.97
ISDN DC Converter Circuit IDCC
PEB 2023 PEF 2023
Data Sheet
SPT 75 R
P-DSO-14
1.1 * * * *
Features
* * * * * * * *
Switched Mode DC/DC Converter ITU ISDN Compatible Low Power Dissipation Supply Voltage Range 0: 8V to 16V Supply Voltage Range 1: 12V to 80V Supply Voltage Range 2: 22V to 90V (pin striping selects between range 1 and range 2) Supply Voltage Range 3, with shifting by an external zener diode: UZD+8V to UZD+90V (minimum zener voltage UZD = 14V) Programmable Overcurrent Protection Soft Start Power Housekeeping Input Input Undervoltage Detection High Input Impedance (<10A) During Undervoltage Condition Oscillator Synchronization Input/Output High Voltage Smart Power Technology 75V P-DSO-14/1 Package Ordering Code Q67100-H6830 Q67220-H1059
5
Type PEB 2023 PEF 2023
Semiconductor Group
Package P-DSO-14 P-DSO-14
08.97
PEB 2023 PEF 2023
Overview 1.2 Pin Configuration
(top view)
P-DSO-14 VREF IP GND GA VEXT CSS VS 1 2 3
IDCC
14 13 12
RC SYNC UVx UV VN VP COMP
4 PEB 2023 11 5 PEF 2023 10 6 7 9 8
Semiconductor Group
6
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PEB 2023 PEF 2023
Overview 1.3 Pin No.
1 2
Pin Definitions and Functions Symbol
VREF IP
Input (I) Output (O)
O I
Function
Output of the 4V reference voltage. When the voltage difference between IP and GND exceeds 100mV, the digital current limiting becomes active and turns off the external FET for the rest of this oscillator period. All analog and digital signals are referred to this pin. Output of the FET-driver. Output of the internal supply. Via VEXT the internal low-voltage-circuits can be supplied from an external DC-supply in order to reduce chip power dissipation. In supply voltage range 0 the positive supply voltage must be connected via a resistor to this pin. The capacitor at this pin determines the soft-start characteristic.
3 4 5
GND GA
I O I/O
VEXT
6 7
CSS VS
I I
VS is the positive input voltage for supply voltage
range 1, 2 and 3. Must be connected to GND via a resistor when using supply voltage range 0.
8 9 10 11
COMP
O I I I
Error amplifier output and Pulse Width Modulator (PWM) input for loop stabilization network. Non-inverting input of the error amplifier. Inverting input of the error amplifier. Input undervoltage lockout. The input undervoltage lockout level depends on the used supply voltage range. Must be connected to pin VS when using supply voltage range 0. If this pin is connected to UV, then supply range 1 is selected. If this pin is not connected (floating), then supply range 2 or supply range 3 can be used. Must be connected to pin VEXT when using supply voltage range 0. Input for synchronization of the oscillator to an external frequency, or output to synchronize multiple devices. The external timing components of the ramp generator are attached to this pin.
VP VN
UV
12
UVx
I
13
SYNC
I/O
14
RC
I
Semiconductor Group
7
08.97
1.4
Figure 1 Block Diagram
CURRENT LIMITING
V EXT
Semiconductor Group
V S
9.4 V
Functional Block Diagram
SUPPLY AND BIASING
IP
100 mV OUTPUT DRIVER
UV
8
CONTROL LOGIC PWM SOFT START
UNDERVOLTAGE DETECTION
GA
UVx
ERROR AMPL.
VOLTAGE REFERENCE
SAWTOOTH OSCILLATOR
GND CSS COMP VV N P RC SYNC
Overview
V REF
PEB 2023 PEF 2023
08.97
PEB 2023 PEF 2023
Overview 1.5 System Integration
Figure 2 and 3 showing examples out of the wide application field of the PEB/F 2023. In network termination applications, the PEB/F 2023 supplies the internal IC's directly from the U-interface. If the local main supply of the NT is out of order, then the PEB/F 2023 will also supplies the S-interface (restricted power mode).
In the subscriber terminal the PEB/F 2023 is used for feeding the internal circuits.
The PEB/F 2023 accommodates both galvanically isolated and non-isolated configurations. Considering the diversity of DC/DC-converter applications, this part of the specification only shows how to use the special ISDN-features of the PEB/F 2023.
CODEC Interface
S
S Transceiver
U Transceiver
U
HDLC Controller
.C.
5V
Current Limiter
40VRPM 40VNPM
reverse Polarity
DC/DC Converter PEB 2023 PEF 2023
Current Limiter
AC/DC Converter
AC 230V
Figure 2 PEB/F 2023 in ISDN-Concept
Semiconductor Group
9
08.97
PEB 2023 PEF 2023
Overview In figure 3 the S-transformers are replaced by the PEB/F 3023 which is called S-Feeder. When using the S-Feeder a capacitive coupling between S-receive-path and the STransceiver is necessary. For the S-transmit-path the S-Feeder need an extra 2.4V transmitter supply voltage. Because of the DC-voltage-drop on the S-Feeder (about 2V and 4V) the input voltages VRPM and VNPM must be increased (to about 42V and 44V).
CODEC Interface
S
S Transceiver
U Transceiver
U
HDLC Controller
Reset Generator
.C.
S Feeder PEB 3023
5V 2.4V
Current Limiter
40VRPM 44VNPM
reverse Polarity
DC/DC Converter PEB 2023 PEF 2023
Current Limiter
AC/DC Converter
AC 230V
Figure 3 PEB/F 2023 in ISDN-Concept
Semiconductor Group
10
08.97
PEB 2023 PEF 2023
Overview Figure 4 shows the PEB/F 2023 in flyback configuration with transformer isolation using supply voltage range 3. This application circuit is used to supply the internal IC's of the NT from the U-interface and also to supply the S-interface in case of restricted power mode. The DC/DC-converter begins operating when the input voltage exceeds 38V (UZD+8V, see supply voltage range 3). In the start-up phase the PEB/F 2023 is supplied through VS. After this start-up phase, the PEB/F 2023 is supplied via VEXT (power housekeeping input) and the DC/DC-converter will operate until the input voltage falls below 20V (input undervoltage detection). For power saving reasons the value of resistor R6 is as high as possibile. The maximum static VS supply voltage in this example is 120V. How to get a higher maximum dynamic VS supply voltage see chapter 1.6 Surge Protection" on pages 14 and 15. To get a very fast input undervoltage detection see chapter 1.7 Fast Input Undervoltage Detection" on page 15.
41 (20) ... 120 V
BYS 21-45
+5V
D2 CL1 + N2a 220F 20% RLoad1
82/1%
ZD1 BZV55C33
10/10%
R6
N1 0.47F 20% C5 +
0.56/5%
R5
T1
AAA 0 AAA
BSP 89 N2b D3 CL2 + 68F 20%
V
7 VS
C6 100F 20% +
11 12 UV UVx
5 6 VEXT C SS
2 IP
4 GA
RLoad2
3.9/1%
PEB 2023 PEF 2023
GND RC 3 14 VREF VP SYNC COMP VN 13 1 9 8 10
R1 R2 C2 C1 1nF 5% + C3 1F 20% 100nF 10%
68/1%
- 42 V
BAS 21
BAW 76 R3
33 1%
BYS 21-45 D4 CL3 + N2c 100F 20% RLoad3
130/1%
39 5%
47/5%
D1 N3
+ C4 R4 10F 20%
0V
2.2 V
Figure 4 PEB/F 2023 in Flyback Configuration with Transformer Isolation
Semiconductor Group
11
08.97
PEB 2023 PEF 2023
Overview Figure 5 shows the PEB/F 2023 in a non-isolated minimum configuration by using supply voltage range 1 (for this input voltages also supply voltage range 2 is possible). The voltage drop over R6 is the difference between input voltage and undervoltage detection level. To get low power dissipation the value of resistor R6 should be as high as possibile. The minimum current through R6 is about 100nA, the maximum current is 1mA (see absolute maximum ratings).
25 ... 38 V
R6
1/10%
0.47F 20% C5 +
L1 R5 10mH
0.22/5%
2.2F 20% C7 +
T1
BSS 296
7 VS
C6 100F 20% +
11 12 UV UVx
5 6 VEXT C SS
2 IP
4 GA
D1 BAS 78B
PEB 2023 PEF 2023
GND RC 3 14 VREF VP SYNC COMP VN 13 1 9 8 10
R1 R2 C2 C3 1F 20% 470nF 10% R4 16/1%
27 5%
10/5%
+ 42 V
R3 150 1% + C4 220F 20% RLoad
330/1%
C1 68pF 5%
+
0V
0V
Figure 5 PEB/F 2023 in a non-isolated Minimum Configuration
Figure 6 shows the PEB/F 2023 in a non-isolated flyback configuration with transformer using supply voltage range 0. The voltage drop over R6 is VEXT-1V. To get low power dissipation the value of resistor R6, should be as high as possibile. For calculating the value of resistor R6 the minimum current through R6 is about 100nA and the maximum current is about 100A.
Semiconductor Group
12
08.97
PEB 2023 PEF 2023
Overview For calculation of resistor R7: VIN, input voltage : VEXT : IR7, input current : VINmin = 8V, VEXTmin = 6V, IR7min = 1mA, VINmax = 16V VEXTmax = 9V IR7max = 6mA V INmin - V EX Tmin R 7ma x = ---------------------------------------------- = 2k I R7min
V INmax - V EXT ma x R 7min = ----------------------------------------------- = 1, 667k I R7max
To get lower power dissipation the value of resistor R7 should also be as high as possibile. For this reason we use R7max. If in the calculation above R7min is higher than R7max, then the input voltage range is not correct; VINmax-VINmin is too large.
Note:
If VINmin = 6V and VINmax = 9V then the resistor R7 is not necessary. The input voltage VIN can directly be connected to VEXT.
8 ... 16 V
BYS 21-45
+5V
D1 4.7F 20% C4 + 0.47F 20% C5 + CL1 + N2a 220F 20% RLoad1
82/1%
R7 R6
1/10% 2/1%
N1 R5
0.1/5%
T1
AA AA
BSP 295 N2b D2 CL2 + 68F 20%
0V
RLoad2
3.9/1%
7 VS
C6 100F 20% +
12 11 UV UVx
5 6 VEXT C SS
2 IP
4 GA
PEB 2023 PEF 2023
GND RC 3 14 VREF VP SYNC COMP VN 8 10 1 9 13
R1 R2 C2 C1 1nF 5% + C3 1F 20% 100nF 10%
- 42 V
BAS 21 BYS 21-45 D3
39 5%
47/5%
R3 18/1% R4
CL3 + N2c 100F 20%
RLoad3
130/1%
2.2 V
0V
72/1%
Figure 6 PEB/F 2023 in a non-isolated Flyback Configuration
Semiconductor Group 13 08.97
PEB 2023 PEF 2023
Overview 1.6 Surge Protection
In telephone and ISDN-systems the topic "surge protection" or "lightning overvoltage protection" is very important. For the PEB/F 2023 overvoltage protection is necessary when the DC/DC converter input supply voltage VIN is connected to the U- or S-interfacelines. Figure 7 shows how to protect the PEB/F 2023 when using supply voltage range 3 (see also figure 4). For supply voltage ranges 1 and 2 the principle is the same.
ZD1 BZV55C30 C6 + R6
Overvoltage protection
V IN
100F 20%
10/10%
R Vs i Vs
i UV
i UVx
11
12 7 UV UVx V S
9.4V
5 V EXT
i LVR
9.4V
LVR
ZDp
100V
UV
... Undervoltage detection circuit
1.2V
LVR ... Linear voltage regulator ZDp ... parasitic zener diode
UV
GND 3
PEB 2023 PEF 2023
0V
Figure 7 PEB/F 2023 Surge Protection The DC/DC converter begins operating when the input voltage exceeds VZD1+8V+VRVs. In the start-up phase the PEB/F 2023 is supplied through VS. After this start-up phase, the PEB/F 2023 is supplied via VEXT (power housekeeping input, see figure 4) and the DC/DC-converter will operate until the input voltage falls below 20V (input undervoltage detection). The current iLVR needed in the start-up phase is less than 500A. With this current and the value of resistor RVs the voltage VRVs can be calculated. For static and transient currents iUV and iUVx, respectively, absulote maximum ratings are valid. Because of the high value of R6 (for power saving reasons), iUV and iUVx normally are sufficiently low. Limits for voltage and current on pin VS are also defined in the maximum ratings.
Semiconductor Group 14 08.97
PEB 2023 PEF 2023
Overview Calculation example: figure 7 with RVs = 4,7k V IN start = V ZD 1 + 8 + ( R V s i LVR ) = 30V + 8V + ( 4 ,7 k 500A ) = 40 ,35V
for t 100msec: V INmax = V ZD1 + 100 + ( R V s iV smax ) = 30V + 100V + ( 4 ,7 k 10mA ) = 177V
for t 10msec: V INmax = V ZD1 + 100 + ( R V s iV smax ) = 30V + 100V + ( 4 ,7 k 30mA ) = 271V
In this example the DC/DC converter begins operating when the input voltage exceeds 40,35V. The maximum transient input voltage is 177V / 271V for a duration of 100msec / 10msec. The maximum static input voltage is given by VZD1 + 90V = 120V, see absolute maximum ratings.
1.7
Fast Input Undervoltage Detection
With three extra devices (D5, D6 and R8, see figure 8) an undervoltage state on the input can be detected faster than the voltage on capacitor C6 decreases. See also chapter undervoltage lockout" on page 17.
D5
ZD BZV55C30
10/10%
R6
C6 100F 20%
+
7 VS
11 UV
PEB 2023 PEF 2023
GND 3
D6
R8
10/10%
0V
Figure 8 PEB/F 2023, Fast Input Undervoltage Detection
Semiconductor Group 15 08.97
PEB 2023 PEF 2023
Functional Description 2 Functional Description
The PEB/F 2023 contains the following functional blocks: * * * * * * * * * * Supply and Biasing Undervoltage Detection Temperature Compensated Voltage Reference Sawtooth Oscillator Error Amplifier Pulse Width Modulator Digital Current Limiting Soft Start Control Logic (double pulse inhibit) Output Driver
The reference voltage provides 4V for the regulation loop. A high gain error amplifier compares the reference voltage to the output voltage. The output of the error amplifier is then compared to a periodic ramp, which is generated by the sawtooth-oscillator circuit. The comparator output is a fixed-frequency, variable pulse width logic signal, which passes through logic circuits and the output driver and out to the external high voltage power-switching-FET. A digital current limiting device suppresses the PWM logic signal when the voltage difference between current limit sense input IP and GND reaches 100 mV to protect the external power-switching-FET. Non-isolated and isolated SMPS-configurations are possible. Logic and analog circuits are implemented in BICMOS in order to achieve low power dissipation. Start-Up Procedure Before the switched-mode DC/DC converter starts, a sequence of several conditions has to be passed in order to avoid any system malfunction. An integrated 6V linear voltage regulator supplies the internal low-voltage BICMOScircuits from the input voltage VS. The generated supply voltage is connected to pin VEXT and has to be buffered by an external capacitor (Cmin = 1F). Power dissipation of the linear voltage regulator can be reduced, if an external supply is used for that purpose by connecting it to pin VEXT. If the input voltage at VEXT is greater than 6.2V, the internal linear voltage regulator turns off and the internal BICMOS-circuits are then fed from the external voltage source (power housekeeping input VEXT). In this case, the input current at VEXT is approximately 0.6mA.
Semiconductor Group
16
08.97
PEB 2023 PEF 2023
Functional Description Note:
An internal 9.4V zener diode protects the VEXT input against overvoltages. The maximum zener current is 6mA! If the external supply isn't stabilized, the input current must be limited (e.g. by a resistor, see also supply voltage range 0)!
Supply Voltage Ranges Supply Voltage Range 0: 8V to 16V In this supply voltage range the PEB/F 2023 can be supplied from a 12V battery. Connect the positive supply voltage via a resistor (R7 in figure 6) to pin VEXT and pin VS via a resistor (R6 in figure 6) to GND. Pin UV must be connected to pin VS. Pin UVx must be connected to pin VEXT. For calculating the values of the two resistors R6 and R7, see the description of figure 6. Supply Voltage Range 1: 12V to 80V Connect the input voltage to pin VS and via a resistor (R6 in figure 5) to pins UV and UVx. For calculating the value of this resistor see the description of figure 5. Supply Voltage Range 2: 22V to 90V Connect the input voltage to pin VS and via a resistor to pin UV. Pin UVx is not connected (floating). Supply Voltage Range 3: UZD+8V to UZD+90V Connect the input voltage via a zener diode (minimum zener voltage UZD = 14V) to pin VS and via a resistor (R6 in figure 4) to pin UV. Pin UVx is not connected (floating). Undervoltage Lockout At the undervoltage detection pin UV, a resistor with a value of about 100k..10M is required to protect this pin against high currents (see absolute maximum ratings). The level of undervoltage detection when using supply voltage range 1 is 8V..12V, using supply voltage range 2 or 3, it is 18V..22V. To get a higher undervoltage detection level a zener diode in series with the resistor is required. When the PEB/F 2023 detects an undervoltage condition, the gate output driver will be turned off. The DC/DC conversion is disabled and the PEB/F 2023 shows a high input impedance seen from the undervoltage detection pins (UV, UVx) and from pin VS to GND. Also the voltage on VEXT will decrease. When the undervoltage condition is removed, the DC/DC converter will be enabled once again with a soft start.
Note:
When using supply voltage range 0 the undervoltage detection circuit is not working. The resistor connected between VS and GND bypasses this undervoltage detection circuit (R6 in figure 6).
Semiconductor Group
17
08.97
PEB 2023 PEF 2023
Functional Description Voltage Reference The reference regulator of the PEB/F 2023 is based on a temperature compensated bandgap. This circuitry is fully active at supply voltages (pin VEXT) above 6 volts and provides up to 0.5mA of load current to external circuitry at 4 volts. This reference has to be buffered by an external capacitor (Cmin = 1F). Sawtooth Oscillator The oscilator frequency is programmed by the two components R1 and C1 (see figure 4, 5 or 6). The oscillator timing capacitor C1 is charged by VREF through R1 and discharged by an internal 10k discharge-resistor. The rise-time of the sawtooth oscillator can be programmed with R1 and C1. The internal discharge-resistor and C1 define the fall-time. At the beginning of the discharge period a positive synchronization pulse is generated at pin SYNC. Otherwise the PEB/F 2023 can be synchronized via pin SYNC to an external logic clock by programming the oscillator to free run at a frequency 10% lower than the synchronization frequency. The PEB/F 2023 is synchronized by the rising edge of the sync. signal. So multiple devices can be synchronized together by programming one master unit for the desired frequency (only one possible interfering frequency). Note that the frequency of the output driver is half the oscillator frequency. The switching frequency as a function of R1 and C1 is shown in figure 9.
350
10 pF 300
250 22 pF
200 f [ kHz ] 150 68 pF
100 pF 100
220 pF 50 470 pF 1 nF 0 10 20 30 40 50 R [ kOHM ] 60 70 80 90 100
Figure 9 Switching Frequency
Semiconductor Group
18
08.97
PEB 2023 PEF 2023
Functional Description Error Amplifier Conventional operational amplifier for closed-loop gain and phase compensation. Low output impedance: unity-gain stable. Pulse Width Modulator The pulse width modulator compares the sawtooth-voltage of the oscillator output with the output of the error amplifier and with the voltage of the external soft start capacitor at pin CSS. Current Limiting When the sense voltage reaches a threshold voltage of 100mV a shutdown signal is sent to the control logic. Sense voltage is the voltage between pin IP and pin GND. Because of the small value of the current-sensing-resistor (R5 in figure 4, 5 or 6) the board layout has to be done carefully. Soft Start The soft start circuit protects the power transistors and rectifier diodes from high current surges during power supply turn-on. When the supply voltage is connected to the PEB/ F 2023 the undervoltage lockout circuit holds the soft start capacitor voltage at zero. When the supply voltage reaches the normal operating range, an internal 1.5A current source will charge the external soft start capacitor. As the soft start voltage ramps up to +5 volts, the duty cycle of the PWM linearly increases to whatever value the regulation loop requires. Control Logic The control logic inhibits double pulses during one duty cycle and limits the maximum duty cycle to 50%. Disable Input Realization One way to disable the function of the PEB/F 2023 is to connect an external n-channel MOS-transistor between the pins UV(drain) and GND(source). By switching on this external transistor the PEB/F 2023 detects an 'undervoltage' and turns off. After switching off this external transistor the PEB/F 2023 turns on and starts the DC/DC conversion with a soft start. A second posibility is to connect an external n-channel MOS-transistor between the pins CSS(drain) and GND(source). By switching on this external transistor the PEB/F 2023 disables the gate output driver because of the soft start circutry. After switching off this external transistor the PEB/F 2023 turns on and starts the DC/DC conversion with a soft start.
Semiconductor Group 19 08.97
PEB 2023 PEF 2023
Electrical Characteristics 3 3.1 Electrical Characteristics Absolute Maximum Ratings
Symbol min. Supply voltage (pin VS) for VS1 sup. voltage range 1 Supply voltage (pin VS) for VS2,3 sup. voltage range 2 or 3 Transient input current on pin VS (sup. voltage range 1, 2 or 3) Analog input voltage (pins IP, COMP, VP, VN, SYNC, RC) Reference output current (pin VREF) SYNC-output current (pin SYNC) Error amplifier output current (pin COMP) Z-current (pin VEXT) Output current (pin VEXT) Driver output current (pin GA) Undervoltage detection input currents (pins UV, UVx) Junction temperature Storage temperature ESD-voltage, all pins -0.3 -0.3 -10 -30 -0.3 Limit Values max. 80 90 10 30 V V mA mA V Referred to GND Referred to GND t 100 msec t 10 msec Referred to GND Unit Test Condition
Parameter
iVs
VI A
VEXT +0.3
IO REF IO SYNC IO COMP IZ EXT IO EXT IO DR IUV, IUVx iUV, iUVx Tj Tstg
5 5 5 6 6 25 1 10 150 150 1
mA mA mA mA mA mA mA mA C C kV Human body model
-10 0 -40
t 10 msec
Note: Note:
Maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the integrated circuit. If not otherwise stated than this absolute maximum values are static values. For overvoltage protection (pin VS respectively UV and UVx) see chapter 1.6 Surge Protection.
Semiconductor Group
20
08.97
PEB 2023 PEF 2023
Electrical Characteristics 3.2 Operating Range
Symbol min. Ambient temperature under bias PEB 2023 PEF 2023 Limit Values max. Unit Test Condition
Parameter
TA TA
0 -40 12 8
70 85 80 90
C C V V Referred to GND Referred to GND
Supply voltage (pin VS) for VS1 sup. voltage range 1 Supply voltage (pin VS) for VS2,3 sup. voltage range 2 or 3
Note:
3.3
In the operating range the functions given in the circuit description are fulfilled.
Static Thermal Resistance
Symbol min. Limit Values max. 112 K/W P-DSO-14 Unit Test Condition
Parameter Junction to ambient
Rth, jA
Semiconductor Group
21
08.97
PEB 2023 PEF 2023
Electrical Characteristics 3.4 DC Characteristics
Symbol min. Supply current (pin VS to GND) IS Limit Values typ. 6 max. 12 A Unit Test Condition
Parameter
VEXT = 6.2V, VS = 40V
Reference VREF Output voltage Line regulation
VREF O VREF Line
3.96
4.0 0.1
4.04 5
V mV
TA = 25C , IL = 0mA, VS = 40V TA = 25C , VS = 25 to 65V, IL = 0mA, TA = 25C , IL = 0.1 to 0.3mA, VS = 40V TA = -40 to 85C , IL = 0mA, VS = 40V
Load regulation
VREF Load
2
5
mV
Temperature stability
VREF TS
10
20
mV
Oscillator SYNC, RC fOSC = 20kHz, RT = 39k 1 %, CT = 1nF 1 % Initial accuracy Voltage stability of fOSC Temperature stability of fOSC Max. frequency H-sawtooth voltage L-sawtooth voltage H-sync output level L-sync output level Pulse Width Modulator Duty cycle Soft Start CSS Charging current fO fO Line fO TS 5 0.1 10 1 5 550 3.0 1.6 2.4 3.2 1.8 3.5 0.2 3.4 2.0 5.25 0.8 % % % kHz V V V V
TA = 25C , VS = 40V TA = 25C , VS = 25 to 65V TA = -40 to 85C , VS = 40V
RT =20k, CT=10pF
fmax VH VL VSYNC H VSYNC L
IL = 0.5mA, VEXT = 6.2V IL = 20A
td
0
50
%
IC
1
1.5
2
A
VCSS = 0V
Semiconductor Group
22
08.97
PEB 2023 PEF 2023
Electrical Characteristics DC Characteristics (cont'd)
Parameter Symbol min. Error Amplifier COMP, VP, VN Input offset voltage Input current Common mode range DC open loop gain Common mode rejection Unity gain bandwidth Supply voltage rejection Limit Values typ. max. Unit Test Condition
VIO II VCMR GVO kCMR f kSVR VOH VOL
-10 25 1.8 60 60 0.5 60 4.5 0.02 70 70 1 70
10 50 4.5
mV nA V dB dB MHz dB V
VCM = 3.0V
f 10kHz
CL (pin) = 10pF
f 10kHz
VEXT / VCOMP
H-output voltage L-output voltage Current Limit Comparator IP TA = 25C Sense voltage PEB 2023 PEF 2323 Input bias current Input voltage range Response time (signal at GA) Output Driver GA TA = 25C, H-output voltage L-output voltage Rise time (10% to 90%) Fall time (90% to 10%)
IL = 100A IL = 10A
0.1
V
VSense VSense II VI tRes
90 85
100 100 -25
110 115 -40 1
mV mV A V ns
VS = 40V VS = 40V VIP = 0V IP = 0 200mV
0 250
500
VOH VOL tr tf
4.5 0.3 50 50
V EXT
0.4 200 200
V V ns ns
ISource = 20mA, V EXT = 6.2V ISink = 20mA C L = 800pF, V EXT = 6.2V C L = 800pF, V EXT = 6.2V
Semiconductor Group
23
08.97
PEB 2023 PEF 2023
Electrical Characteristics DC Characteristics (cont'd)
Parameter Symbol min. Undervoltage Detection UV, UVx Start-up threshold 1 Start-up threshold 2,3 Limit Values typ. max. Unit Test Condition
VUV St1 VUV St2,3
8 18
10 20
12 22
V V
supply voltage range 1 supply voltage range 2 or 3
External Supply VEXT Output voltage Output current Input voltage Z-current General Parameters, TA = 25C Power consumption
VO IO VI IZ
5.8 6.2
6.0
6.2 2 9 6
V mA V mA
Ptot
5
6
mW
VS = 40V, fOSC = 20kHz, C L GATE = 470pF, V EXT = 6.2 to 6.7V
undervoltage"
High impedance input current
IHI
10
A
Note:
The listed characteristics are ensured over the operating range of the integrated circuit. Typical characteristics specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply at TA = 25 C and the given supply voltage.
Semiconductor Group
24
08.97
PEB 2023 PEF 2023
Package Outlines 4 Package Outlines
Plastic Package, P-DSO-14 (Plastic Dual Small Outline
Semiconductor Group
25
08.97

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