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KA3511BS
Intelligent Voltage Mode PWM IC
Features
* * * * * * * * * * * * * * Complete PWM control and house keeping circuitry Few external components Precision voltage reference trimmed to 2% Dual output for push-pull operation Each output TR for 200mA sink current Variable duty cycle by dead time control Soft start capability by using dead time control Double pulse suppression logic Over voltage protection for 3.3V / 5V / 12V Under voltage protection for 3.3V / 5V / 12V One more external input for various protection (PT) Remote on/off control function (PS-ON) Latch function controlled by remote and protection input Power good signal generator with hysteresis
Description
The KA3511BS is a fixed frequency improved performance pulse width modulation control circuit with complete housekeeping circuitry for use in the secondary side of SMPS (Switched mode power supply). It contains various functions, which are precision voltage reference, over voltage protection, under voltage protection, remote on/off control, power good signal generator and etc.
OVP (Over voltage protection) section
It has OVP functions for +3.3V,+5V,+12V and PT outputs. The circuit is made up of a comparator with four detecting inputs and without hysteresis voltage. Especially, PT (Pin18) is prepared for an extra OVP input or another protection signal.
UVP (Under voltage protection) section Precision reference section
The reference voltage trimmed to 2% (4.9V Vref 5.1V) It also has UVP functions for +3.3V, +5V, +12V outputs. The block is made up of a comparator with three detecting inputs and without hysteresis voltage.
PG (Power good signal generator) section
Power good signal generator is to monitor the voltage level of power supply for safe operation of a microprocessor. KA3511BS requires few external components to accomplish a complete housekeeping circuits for SMPS.
Remote on/off section
Remote on/off section is used to control SMPS externally. If a high signal is supplied to the remote on/off input, PWM signal becomes a high state and all secondary outputs are grounded. The remote on/off signal is transferred with some on-delay and off-delay time of 8ms, 24ms respectively.
24-SDIP
1
Rev. 1.0.1
(c)2001 Fairchild Semiconductor Corporation
KA3511BS
Internal Block Diagram
RT CT
24 7 OSCILLATOR 8 PWM CONTROL CK 2 23 DELAY CONTROLLER Q D Q 22
C1
C2
COMP V5 V12
E
E/A() E/A(+ ) DEAD TIME CONTROL
3 4
DEAD TIME CONTROLLER Q
R
REMOTE ON/OFF
5
TREM
6 S REM (PS-ON) 1.4V 11 PG PT V12 V5 V3.3
1.25V 0.1V 21 5V INTERNAL BIAS VREF 14 VREF Start Up VCC 1 5V COMP1 VREF Ichag PG GENERATOR VREF OVP COMP 1.25 V COMP3 9 1.8V COMP2 1.25V UVP COMP 1.25 V 10 TPG 2.2u F TUVP 2.2uF 19 20 GND 0.6V 1.8V 0.6V 18 17 16 15
DET
Absolute Maximum Ratings
Parameter Supply voltage Collector output voltage Collector output current Power dissipation(KA3511BS) Operating temperature Storage temperature Symbol VCC VC1, VC2 IC1, IC2 PD TOPR TSTG Value 40 40 200 1.5 -25 to 85 -65 to 150 Unit V V mA W C C
Temperature Characteristics
Parameter Temperature coefficient of Vref (-25CTa85C) Symbol Vref/T Min. Typ. 0.01 Max. Unit %/C
2
KA3511BS
Pin Definition : KA3511BS
C1
E
C2
DTC
GND
TUVP
PT
V12
V5
V3.3
Vref
NC
#24
#13
AS BS KA3511D
#1
Vcc COMP E/A(-) EA(+) TREM REM RT CT DET TPG PG NC
#12
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12
Pin Name VCC COMP E/A(-) E/A(+) TREM REM RT CT DET TPG PG NC
I/O I O I I I I O -
Pin Function Supply voltage E/A output E/A (-) input E/A (+) input Remote on/off delay Remote on/off input Oscillation freq. setting R Oscillation freq. setting C Detect input PG delay Power good signal output NC
Pin Number 13 14 15 16 17 18 19 20 21 22 23 24
Pin Name NC Vref V3.3 V5 V12 PT TUVP GND DTC C2 E C1
I/O O I I I I I O O
Pin Function Descrition NC Precision reference VTG OVP, UVP input for 3.3V OVP, UVP input for 5V OVP, UVP input for 12V Extra protection input UVP delay Signal ground Deadtime control input Output 2 Power ground Output 1
3
KA3511BS
Pin Number Pin Name 1 2 3 4 5 VCC COMP E/A(-) E/A(+) TREM
Pin Function Descrition Supply voltage. Operating range is 10V~30V. VCC=20V, Ta=25C at test. Error amplifier output. It is connected to non-inverting input of pulse width modulator comparator. Error amplifier inverting input. Its reference voltage is always 1.25V. Error amplifier non-inverting input feedback voltage.This pin may be used to sense power supply output voltage. Remote on/off delay. Ton/Toff=8ms/24ms (Typ.) with C=0.1uF. Its high/low threshold voltage is 1.8V/0.6V. Remote on/off input. It is TTL operation and its threshold voltage is 1.4V. Voltage at this pin can reach normal 4.6V, with absolutely maximum voltage, 5.25V. If REM = "Low", PWM = "Low". That means the main SMPS is operational. When REM = "High", then PWM = "High" and the main SMPS is turned-off. Oscillation frequency setting R. (Test Condition RT=10k) Oscillation frequency setting C. (Test Condition CT=0.01uF) Under voltage detection pin. Its threshold voltage is 1.25V Typ. PG delay. Td=250ms (Typ) with CPG=2.2uF. The high/low threshold voltage are 1.8V/ 0.6V and the voltage of Pin10 is clamped at 2.9V for noise margin. Power good output signal. PG = "High" means that the power is "Good" for operation and PG = "Low" means "Power fail". Precision voltage reference trimmed to 2%. (Typical Value = 5.03V) OVP, UVP input for output 3.3V. (Typical Value = 4.1V/2.3V) OVP, UVP input for output 5V. (Typical Value = 6.2V/4.0V) OVP, UVP input for output 12V. (Typical Value = 14.2V/10V) This is prepared for an extra OVP input or another protection signal. (Typical Value = 1.25V) Timing pin for under voltage protection blank-out time. Its threshold voltage is 1.8V and clamped at 2.9V after full charging. Target of delay time is 250ms and it is realized through external (C=2.2uF). Signal ground. Deadtime control input. The dead-time control comparator has an effective 120mV input offset which limits the minimum output dead time. Dead time may be imposed on the output by setting the dead time control input to a fixed voltage, ranging between 0V to 3.3V. Output drive pin for push-pull operation. Power ground. Output drive pin for push-pull operation.
6
REM
7 8 9 10 11 14 15 16 17 18
RT CT DET TPG PG Vref V3.3 V5 V12 PT
19 20
TUVP GND
21
DTC
22 23 24
C2 E C1
4
KA3511BS
Electrical Characteristics (Vcc=20V, Ta=25C)
Parameter REFERENCE SECTION Reference output voltage Line regulation Load regulation Temperature coefficient of Vref Short-circuit output current OSCILLATOR SECTION Oscillation frequency Frequency change with temperature (1) DEAD TIME CONTROL SECTION Input bias current Maximum duty voltage Input threshold voltage ERROR AMP SECTION Inverting reference voltage Input bias current Open-loop voltage gain (1) Unit-gain bandwidth Output sink current Output source current PWM COMPARATOR SECTION Input threshold voltage OUTPUT SECTION Output saturation voltage Collector off-state current Rising time Falling time PROTECTION SECTION Over voltage protection for 3.3V VOVP1 3.8 4.1 4.3 V VCE(SAT) IC(off) TR TF IC=200mA VCC=VC=30V, VE=0V 1.1 2 100 50 1.3 100 200 200 V uA ns ns VTH(PWM) Zero Duty Cycle 4 4.5 V
(1) (1)
Symbol Vref Vref.LINE Vref.LOAD Vref/T ISC fosc fosc/T
Condition Iref=1mA 10V VCC 30V 1mA Iref 10mA -25C Ta 85C Vref=0 CT=0.01uF, RT=12k CT=0.01uF, RT=12k
Min. 4.9 15 -
Typ. 5 2.0 1.0 0.01 35 10 2
Max. 5.1 25 15 75 -
Unit V mV mV %/C mA kHz %
IB(DT) DCMAX VTH(DT)
Pin19 (DTC)=0V Zero Duty Cycle Max. Duty Cycle VCOMP=2.5V 0.5VVCOMP3.5V VCOMP=0.7V VCOMP=3.5V
45 0 1.20 70 0.3 -2.0
-2.0 48 3.0 1.25 -0.1 95 650 0.9 -4.0
-10 50 3.3 1.30 -1.0 -
uA % V
Vref(EA) IB(EA) GVO BW ISINK ISOURCE
V uA dB kHz mA mA
5
KA3511BS
Electrical Characteristics (continued)
Parameter Over voltage protection for 5V Over voltage protection for 12V Input threshold voltage for PT Under voltage protection for 3.3V Under voltage protection for 5V Under voltage protection for 12V Charging current for UVP delay UVP Delay Time REMOTE ON/OFF SECTION REM on input voltage REM off input voltage REM off input bias voltage REM on open voltage REM on delay time REM off delay time REMOTE ON/OFF SECTION Detecting input voltage Detecting V5 voltage Hysteresis voltage 1 Hysteresis voltage 2 PG output load resistor Charging current for PG delay PG delay time PG output saturation voltage TOTAL DEVICE Stanby supply current ICC 10 20 mA
Note: 1. These Parameters, although guaranteed over their recommended operating conditions are not 100% tested in production. 2. REM on delay time (Pin6 REM: "L" "H"), REM off delay time (Pin6 REM: "H" "L")
(2)
Symbol VOVP2 VOVP3 VPT VUVP1 VUVP2 VUVP3 ICHG.UVP TD.UVP VREMH VREML IREML VREM(OPEN) Ton Toff VIN(DET) V5(DET) HY1 HY2 RPG ICHG.PG TD.PG VSAT(PG)
Condition C=2.2uF, VTH=1.8V C=2.2uF IREM=-200uA VREM=0.4V C=0.1uF C=0.1uF COMP1, 2 COMP3 C=2.2uF, VTH=1.8V C=2.2uF IPG=10mA
Min. 5.8 13.5 1.20 2.1 3.7 9.2 -10 100 2.0 2.0 4 16 1.20 4.1 10 0.6 0.5 -10 100 -
Typ. 6.2 14.2 1.25 2.3 4.0 10 -15 260 8 24 1.25 4.3 40 1.2 1 -15 260 0.2
Max. 6.6 15.0 1.30 2.5 4.3 10.8 -23 500 0.8 -1.6 5.25 14 34 1.30 4.5 80 2 -23 500 0.4
Unit V V V V V V uA ms V V mA V ms ms V V mV V k uA ms V
6
KA3511BS
Application Informations
300K VCC=15V 100K IO - OSCILLATOR FREQUENCY
0.001F 10K CT=0.01F 1K 0.1F
1.0F 100 30 1K 2K 5K 10K 20K 50K 100K 200K 500K 1M
RT. TIMING RESISTANCE()
Figure 1. Oscillator Frequency vs. Timing Resistance
Ct Feedback Dead-time control
Ck Q
Q
Output Q1
Output Q2
Figure 2. Operating Waveform
7
KA3511BS
Housekeeping Circuit
2k(1W ) 2k(1W )
Standby Supply VCC=20V 12V 5V 0.01u F 11k 33k 15k
1
VCC
C1
24
2
COMP
E
23
3
E/A(-)
C2
22
4
1.8k 0.1uF 1k +
E/A(+)
DTC
21
5
TREM
6
Micom
REM
7
12k
RT
K A 3 5 1 1 A B
GND
20
TUVP
19
+ 2.2uF
PT
18
S
V12
8
+ 0.01u F
CT
17
12V
9
DET
V5
16
5V
10
+ PG
TPG
V3.3
15
3V
2.2uF
11
PG
Vref
14
1uF +
12
13
Note : The KA3511BS requires few external components to accomplish a complete housekeeping circuits for SMPS.
8
KA3511BS
Typical Characteristics
0.014 5.010 0.012 0.010 5.008
ICC [A]
0.008 0.006 0.004 0.002 0.000 0 10 20 30 40
Vref [V]
5.006 5.004
5.002 -40 -20 0 20 40 60 80 100 120 140
Supply Voltage [V]
TEMP [C]
Figure 3. VCC-ICC
Figure 4. Bandgap Reference Voltage
50 40
5 4 31.1% 21.8% 3
Duty Ratio [%]
VPG [V]
12.8%
30 20 10 0 0.0 0.5 1.0 1.5 2.0 2.5 2.73 3.0
2 1 0 3.6 3.8 4.0 4.2 4.4 4.6
Deadtime Control Voltage [V]
V3.3 [V]
Figure 5. PIN19(Dead Time Control Voltage)-Duty Cycle
Figure 6. OVP for 3.3V
7 6 5 5 4
VPG [V]
3 2 1 0 5.0 5.5 6.0 6.5 7.0
VPG [V]
4
3 2 1 0 14.0 14.2 14.4 14.6 14.8 15.0
V5 [V]
V12 [V]
Figure 7. OVP for 5V
Figure 8. OVP for 12V
9
KA3511BS
Typical Characteristics (Continued)
5 4 5 4
VPG [V]
3 2 1 0 1.15 1.20 1.25 1.30 1.35
VPG [V]
3 2 1 0 21 22 23 24 25
Vpt [V]
Pin 13 (V3.3) Voltage [V]
Figure 9. OVP for PT
Figure 10. UVP for 3.3V
5 4
5 4
VPG [V]
VPG [V]
3 2 1 0 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0
3 2 1 0 9.0 9.5 10.0 10.5 11.0
Pin 14 (V5) Voltage [V]
Pin 15 (V12) Voltage [V]
Figure 11 . UVP for 5V
Figure 12 . UVP for 12V
-0.000016 5 -0.000018 4 3 2 1 -0.000024 0 0 50 100 150 200 250 0 1 2 3 4 5
Irem [A]
-0.000020
-0.000022
VPG [V]
Vrem [V]
Figure 13 . Remote ON Charging Current
Figure 14 . REM ON/OFF Vth
10
KA3511BS
Typical Characteristics (Continued)
5 4 5 4
Vrem [V]
VPG [V]
0 1 2 3 4 5
3 2
3 2 1
1 0 0 1.0 1.1 1.2 1.3 1.4 1.5
Pin 9 (DET) Voltage [V]
Figure 15. Remote ON Open Voltage
Figure 16. Detecting VCC Voltage (DET)
-0.000005 5 4 -0.000010
VPG [V]
3 2 1 0 4.0 4.2 4.4 4.6 4.8 5.0
IPG [V]
-0.000015
-0.000020
0
20
40
60
80
100
120
140 160
Pin 14 (5V) Voltage [V]
Figure 17. Detecting V5 Voltage
Figure 18. Charging Current for PG
-0.032
5 4
VPG [V]
0 100 200 300 400
Iref [A]
-0.033
3 2 1
-0.034
-0.035 0 0.0 0.5 1.0 1.5 2.0 2.5
Pin 10 (TPG) Voltage [V]
Figure 19. Short Circuit Current
Figure 20. Hysteresis Voltage 2
11
KA3511BS
Typical Characteristics (Continued)
0.002 5 0.00
Isink & Isource [A]
4
Vref [V]
0 20 40 60 80 100 120 140
-0.002 -0.004 -0.006 -0.008
3 2 1 0 0 10 20 30 40
Supply Voltage [V]
Figure 21. Error Amp Sink Current
Figure 22. Reference Voltage
12
KA3511BS
Experimental Result
CH1 : PS-ON CH2 : +5Vdc Output CH3 : PG Signal
Figure 23. Rising Time of +5Vdc Output Voltage
CH1 : PS-ON CH2 : +5Vdc Output CH3 : PG Signal
Figure 24. PG Signal Delay Time
13
KA3511BS
CH1 : PS-ON CH2 : +5Vdc Output CH3 : PG Signal
Figure 25. Power Down Warning
CH1 : +3.3Vdc Output CH2 : +5Vdc Output CH3 : +12Vdc Output
Figure 26. No Load Protection
14
KA3511BS
CH1 : Vcc CH2 : +5Vdc Output CH3 : PG Signal
Figure 27. Vcc, +5Vdc Output vs. PG Signal (High)
CH1 : Vcc CH2 : +5Vdc Output CH3 : PG Signal
Figure 28. Vcc, +5Vdc Output vs. PG Signal (Low)
15
KA3511BS
Application Circuit
47K R6 70K VCC R5 103 IC1 1 2 3 15K POWER ON + 0.1uF OUT REF 6 7 8 103 9 10 + 2.2uF 11 PG 100K + 4 5 Vcc COMP E/A(-) E/A(+) TREM REM RT CT DET TPG C1 E C2 DTC GND TUVP PT V12 V5 V3.3 C1
24 22 23 21 22 20
19 21
C2
R4 1.2K
20 18
17 19 R3 56K + C6 22uF 12V OUT 5V OUT 3.3V OUT
17 15 16 14 15 13 14 12 13
PG NC 12 NC D19
Vref NC NC B AR3511XS KA3511BS
C16 VR1
D9 CT
16
+
18 16
2.2uF
KA3511BS
Mechanical Dimensions
Package Dimensions in millimeters
24-SDIP
17
KA3511BS
Ordering Information
Product Number KA3511BS Package 24-SDIP Operating Temperature 0C ~ 70C
18
KA3511BS
19
KA3511BS
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 7/2/01 0.0m 001 Stock#DSxxxxxxxx 2001 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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