View CAT4106HV4-GT2_4973470.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

CAT4106 6 W Quad Channel DC/DC LED Driver with Diagnostics
Description
The CAT4106 is an integrated multi-channel LED driver and high power DC/DC converter suitable for powering backlighting applications up to a total of 6 watts. Up to four matched LED strings can be accurately programmed with uniform drive current set by a single external resistor. Each output channel is suitable for LED string voltages of up to 36 V. The driver automatically adjusts the output voltage to drive the highest forward voltage string with the minimum headroom voltage maximizing the efficiency. High resolution dimming control is achieved by the EN/PWM logic pin which supports multiple frequencies. This ensures precise PWM dimming control while the device remains fully biased. In addition, when held at logic low, the device to enter a full shutdown "zero" current mode. External programming resistors set the minimum and maximum voltage limits for the acceptable "window of operation" for LED strings. Any channel which fails to regulate within the window (Open or Short LED) is detected and flagged on the FAULT logic output (active low, open-drain). The device is available in a 16-lead TQFN 4 mm x 4 mm and TSSOP with exposed pad packages.
Features
http://onsemi.com
1 TQFN-16 HV4 SUFFIX CASE 510AE
1 TSSOP-16 YP SUFFIX CASE 948AP
PIN CONNECTIONS
LED1 GND FAULT PGND FB SW EN/PWM NC 1 LED2 LED3 LED4 RSET VFMAX VFMIN CTRL VIN
TAB is GND
RSET LED4 LED3 LED2
* * * * * * * * * * * *
Four LED Channels with Tight Current Matching Integrated DC/DC Boost Converter Up to 6 W LED Total Output Power Up to 92% Efficiency Low Dropout LED Channels (500 mV at 175 mA) High Frequency PWM Interface (up to 2 kHz) Adjustable Short/Open LED Detection Programmable LED Channel Current Adjustable LED Channel Voltage Thermal Shutdown Protection 16-lead TQFN 4 x 4 mm and TSSOP Packages These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant
LED1 GND FAULT PGND
1 TAB is GND NC EN/PWM SW FB (Top Views)
VFMAX VFMIN CTRL VIN
MARKING DIAGRAMS
4106Y
CDAL
Applications
CDAL = CAT4106HV4-GT2 4106Y = CAT4106YP-T2
* LCD Backlight Lighting * Automotive and General Purpose Lighting
ORDERING INFORMATION
Device CAT4106HV4-GT2 (Note 1) CAT4106YP-T2 (Note 1) Package TQFN-16 (Pb-Free) TSSOP-16 (Pb-Free) Shipping 2,000/ Tape & Reel 2,000/ Tape & Reel
1. NiPdAu Plated Finish (RoHS-compliant) 2. Matte-Tin Plated Finish (RoHS-compliant)
(c) Semiconductor Components Industries, LLC, 2010
March, 2010 - Rev. 0
1
Publication Order Number: CAT4106/D
CAT4106
VL 3 V to 24 V C2 4.7 mF VIN 3 V to 5.5 V C1 1 mF OFF... ON... DIM L 47 mH D C3 10 mF/ 50 V SW VFMAX VFMIN CAT4106 EN/PWM RSET R5 R7
R4
R6
VIN
R1
LED1 LED2 LED3 R2 20 kW LED4 CTRL FAULT FB GND PGND R3 20 kW
VIN R8 LED Fault Detection (open drain pull-down)
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters VIN, RSET, EN/PWM, CTRL, FB, FAULT VFMIN, VFMAX LED1, LED2, LED3, LED4 SW (internally clamped to 40 V) Storage Temperature Range Junction Temperature Range Lead Temperature Ratings -0.3 V to 6 -0.3 V to 6 -0.3 V to 25 50 -65 to +160 -40 to +150 300 Units V V V V _C _C _C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter VIN Inductor Drive Voltage LED String Forward Voltage per channel Ambient Temperature Range ILED per LED pin 3. Typical application circuit with external components is shown above. Range 3.0 to 5.5 3.0 to 24 up to 36 -40 to +85 10 to 175 Units V V V _C mA
Table 3. RECOMMENDED EN/PWM TIMING
Symbol TLEDSETUP TLO THI TPWRDWN TLEDSET Name LED setup time from shutdown EN/PWM low time EN/PWM high time
(For 3.0 VIN 5.5 V, over full ambient temperature range -40 to +85C.) Conditions Min 10 0.2 0.2 8 ILED = 100 mA 0.2 Typ 40 Max 100 2000 Units ms ms ms ms ms
EN/PWM low time to shutdown delay LED current settling time
http://onsemi.com
2
CAT4106
TLEDSETUP EN/PWM SHUTDOWN 100% BRIGHTNESS DIMMING POWERDOWN SHUTDOWN THI TLO TPWRDWN
LED CURRENT
DEVICE QUIESCENT CURRENT
Figure 2. CAT4106 EN/PWM Timing
Table 4. ELECTRICAL OPERATING CHARACTERISTICS
VIN = 5 V, VL (inductor drive voltage) = 12 V, TAMB = 25C (over recommended operating conditions unless specified otherwise) Symbol IQ Description VIN Operating Current Conditions Switching Not Switching Switching Not Switching VEN = 0 V Device Enable Level Disable/PWM Level VIN pin voltage 0.8 0.7 200 2.0 150 20 10 mA < IRSET < 2 mA 30 mA LED current ILED = 175 mA 0.5 V < VLED < 5 V Channel is Off 1.15 1.15 Offset to Lowest LED output FAULT is Active (0.1 V bias) FAULT is Inactive Normal switching mode regulation - 0.1 25 1 285 1.20 1.20 0 2 1 300 315 1 1.3 -5 1.17 1.20 100 0.5 1 +5 1 1.25 1.25 + 0.1 V % mA V V V mA mA mA mV mA MHz A W % % mA V 1.23 (ILED = 30 mA) (ILED = 30 mA) (ILED = 60 mA) (ILED = 60 mA) Min Typ 2.5 2.0 3.4 2.9 Max 3.5 3.0 4.4 3.9 1 1.3 300 Units mA
ISD VIH VIL REN VUVLO TSD THYS VRSET ILED/IRSET VDO DILED ILED-OFF VVFMAX VVFMIN VCTRL ICTRL IFAULT VFB IFB FSW ISWMAX RSW DCMAX DCMIN ISWLEAK OVPSW
VIN input shutdown Current EN/PWM Logic High Threshold Logic Low Threshold Internal Pull-Down Resistor Undervoltage lockout (UVLO) Thermal Shutdown Threshold Thermal Hysteresis RSET regulation voltage RSET to LED Current gain ratio LED Channel Dropout Voltage LED Channel Matching LED Channel leakage O/C Detect voltage threshold S/C Detect voltage threshold CTRL pin voltage accuracy CTRL pin maximum load Pull-down Drive Current Open Drain Leakage Current FB Pin control voltage FB pin input leakage current SW Pin Switching Frequency Switch Pin Current Limit Switch Pin On-resistance Maximum Duty Cycle Minimum Duty Cycle Switch Leakage Current Over Voltage Protection Detect
mA V V kW V _C _C V
0.4 100
0.7 0.8 ISW = 500 mA Prior to Current Limiting Prior to Pulse-Skipping VSW = 20 V Enters Low Power mode
1.0 1.0 1.0 96 5 40
5
http://onsemi.com
3
CAT4106
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 5 V, VL = 12 V, TAMB = 25C, typical application circuit unless otherwise specified.) 8 QUIESCENT CURRENT (mA) 1.30
switching 4 not switching 2
RSET VOLTAGE (V) 1.5 2.0
6
1.25
1.20
1.15
0
0
0.5
1.0 RSET CURRENT (mA)
1.10
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
Figure 3. Quiescent Current vs. RSET Current
1.30 140
Figure 4. RSET Voltage vs. VIN Supply
RSET VOLTAGE (V)
1.25
120
1.20
GAIN 0 50 TEMPERATURE (C) 100 150
100
1.15
80
1.10 -50
60
20
60
100 LED CURRENT (mA)
140
180
Figure 5. RSET Voltage vs. Temperature
200 175 LED CURRENT (mA) LED CURRENT (mA) 150 125 100 75 50 25 0 0 0.2 0.4 0.6 0.8 1.0 200 175 150 125 100 75 50 25 0 3.0
Figure 6. ILED/IRSET Gain vs. LED Current
3.5
4.0
4.5
5.0
5.5
LED PIN VOLTAGE (V)
VIN SUPPLY (V)
Figure 7. LED Channel Current vs. LED Pin Voltage
Figure 8. LED Channel Current vs. VIN Supply
http://onsemi.com
4
CAT4106
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 5 V, VL = 12 V, TAMB = 25C, typical application circuit unless otherwise specified.) 0.9 0.8 0.7 30 25 20 15 10 5
0.6 0.5 R2 = R3 = 24 kW 0.4 3.0 3.5 4.0 4.5 5.0 5.5
FAULT DRIVE RDSON (W)
LED PIN VOLTAGE (V)
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
VIN SUPPLY (V)
Figure 9. LED Channel Voltage vs. VIN Supply
2.0 SWITCHING FREQUENCY (MHz) SWITCH RESISTANCE (W) 1.2
Figure 10. FAULT Drive RDSON vs. VIN Supply
1.5
1.1
1.0
1.0
0.5
0.9
0
3.0
3.5
4.0
4.5
5.0
5.5
0.8
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
VIN SUPPLY (V)
Figure 11. Switch Resistance vs. VIN Supply
1200 POWERDOWN DELAY (ms) SW CURRENT LIMIT (mA) 1100 1000 900 800 700 600 5 4 3 2 1 0
Figure 12. Switching Frequency vs. VIN Supply
3.0
3.5
4.0
4.5
5.0
5.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
VIN SUPPLY (V)
Figure 13. Switching Current Limit vs. VIN Supply
Figure 14. Powerdown Delay vs. VIN Supply
http://onsemi.com
5
CAT4106
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 5 V, VL = 12 V, TAMB = 25C, typical application circuit unless otherwise specified.) 1.00 TOTAL LED CURRENT (%) EN/PWM THRESHOLD (V) 0.95 VHI 0.90 0.85 0.80 0.75 0.70 100
VLO
10
100 Hz 1 1 kHz 1 10 DUTY CYCLE (%) 100
3.0
3.5
4.0
4.5
5.0
5.5
VIN SUPPLY (V)
Figure 15. EN/PWM Threshold vs. VIN Supply
Figure 16. PWM Duty Cycle vs. LED Current
Figure 17. PWM Dimming 100 Hz
200 MAX ILED PER CHANNEL (mA)
Figure 18. PWM Dimming 1 kHz
VOUT = 20 V 150 25 V 100 30 V
50
0
2
4
6
8
10 VL (V)
12
14
16
Figure 19. Power-Up 4 x 10 LEDs, 50 mA per Channel
Figure 20. Maximum LED Current vs. VL Supply
http://onsemi.com
6
CAT4106
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 5 V, VL = 12 V, 20 mA per channel (80 mA total output current), TAMB = 25C, typical application circuit unless otherwise specified.) 100 95 EFFICIENCY (%) EFFICIENCY (%) VOUT = 19 V 75 70 75 70 90 85 80 100 95 90 85 80 VOUT = 24 V
4.5
4.7
4.9
5.1
5.3
5.5
8
10
12
14
16
INPUT VOLTAGE (V)
INDUCTOR VOLTAGE (V)
Figure 21. Efficiency vs. VIN (VIN = VL)
100 95 EFFICIENCY (%) 90 85 80 75 70
Figure 22. Efficiency vs. VL (VIN = 5 V)
40
80
120
160
200
240
OUTPUT CURRENT (mA)
Figure 23. Efficiency vs. Output Current (9-LED String)
http://onsemi.com
7
CAT4106
Table 5. PIN DESCRIPTION
TQFN-16 Name LED1 GND FAULT PGND FB SW EN/PWM N.C. VIN CTRL VFMIN VFMAX RSET LED4 LED3 LED2 TAB TSSOP-16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 TAB LED1 cathode terminal Signal Ground reference Open/Short LED Fault detection output (active-low) Power Ground Reference (DC/DC Power Switch) Feedback reference (300 mV) for setting LED channel operating voltage Internal power FET switch drain connection Device Enable (active high) and PWM control input Not connected Supply voltage for the device LED channel operating voltage (lowest of all 4 channels) Comparator input for setting the LED string short-circuit voltage limit Comparator input for setting the LED string open-circuit voltage limit RSET resistor pin for setting the LED channel operating current LED4 cathode terminal LED3 cathode terminal LED2 cathode terminal Thermal pad (connect to GND and PGND) Function
Pin Descriptions VIN is the supply pin for the device. The supply input current needed for normal operation is approximately 2 mA plus 3 times IRSET pin current. During intervals of PWM dimming, or whenever the converter is not switching, the supply current will decrease by around 1 mA. The voltage applied at VIN should be kept between 3 V and 5.5 V. A small ceramic bypass capacitor of 0.1 mF or greater is recommended to be in close proximity to the VIN pin. EN/PWM is the device Enable and PWM dimming control input for all LED channels. Guaranteed levels of logic high and logic low are set at 1.3 V and 0.4 V respectively. During normal PWM dimming, the entire device remains fully biased and only the LED channels are pulsed on/off. The device will only enter zero current shutdown mode after the EN/PWM is help low for at least 5 ms typically. This pin has an internal pull-down resistor of 200 kW. RSET is the voltage regulated control pin for sensing the desired programming current level to be applied on all LED channels. During normal operation, the RSET pin is kept at 1.2 V and accurately monitors the current level in the externally applied R1 resistor. The current transfer ratio from RSET pin current to LED pin current is 100. LED1 to LED4 provide the regulated current source for driving each of the LED strings with a tightly matched constant current. To ensure optimal performance, the bias voltage on the LED channels should be set at a nominal 0.6 V or higher. Each channel is capable of driving a current
up to 175 mA. All channels immediately enter a high impedance mode whenever the EN/PWM is taken LOW. CTRL pin is a multiplexer output which selects the lowest operating voltage appearing on any of the four LED output drive channels. This control signal represents the cathode terminal voltage of the LED string with greatest forward voltage (VF). An external resistor network from CTRL to FB can be used to set the lowest operating voltage of each channel. External current loading of the CTRL pin is recommended to be less than 25 mA. FB is the voltage feedback control pin for the internal high power DC/DC converter. This pin has a high impedance input and its voltage remains accurately regulated to 0.3 V during normal steady state operation. SW pin is the drain terminal of the high voltage CMOS power switch which has a typical on-resistance of 1 W and is current limited to 1 A typically. An overvoltage protection circuit places the device in a soft-clamping low power mode if the voltage transients exceed 40 V. VFMIN pin uses a pair of external resistors (R6 & R7) to program the worst case, minimum LED string forward voltage (VFMIN) expected in the specific application. If, during power-up, any LED string enters full regulation before this programmed level is reached (VFMIN pin voltage < 1.2 V), the string will be considered to contain LEDs which are short-circuit and a fault condition will be
http://onsemi.com
8
CAT4106
flagged. The VFMIN input circuitry consists of a comparator referenced to 1.2 V. A typical value for resistor R7 is around 20 kW. R6 can be calculated as follows:
R6 + R7 V FMIN *1 1.2 V
A typical value for resistor R5 is 20 kW. R4 can be calculated as follows:
R4 + R5 V FMAX *1 1.2 V
If this detection feature is not needed, the VFMIN pin must be tied to ground. VFMAX pin uses a pair of external resistors (R4 & R5) to program the worst case, maximum LED string forward voltage (VFMAX) expected in the specific application. If any LED string fails to become regulated before the programmed voltage is reached, the string will be considered to contain LEDs which are open-circuit and a fault condition will be flagged. When an open-circuit is flagged, the individual channel that causes the open-circuit is internally flagged and subsequently ignored. In the event that all channels are detected as being Open-LED, the Output Voltage (top LED Anode) will stabilize at the VFMAX programmed voltage. The VFMAX input circuitry consists of a comparator referenced to 1.2 V.
If this detection feature is not needed, the VFMAX pin must be tied to ground. FAULT is an open-drain, active-low, logic signal which becomes active during an LED short-circuit or open-circuit condition. The pin must be connected to a pull-up resistor of around 100 kW tied to VIN. The drive pull-down resistance (when active) is typically less than 100 W. The diagnostic sequence used to determine a fault condition is initiated when the device is first enabled. PGND pin is the source connection terminal of the high voltage CMOS power switch in the DC/DC converter. The inductor supply bypass capacitor should be connected in close proximity to the PGND pin. The return current from PGND should be connected to the PCB ground plane. GND is the ground reference pin for the device. All analog control voltages are referenced to this pin. In addition, all LED drive currents are conducted through the GND pin. TAB is the thermal pad connection of the package and should be connected to PCB ground plane.
Block Diagram
VL L D R4 R6 R7 VFMIN FAULT Ctrl/Fault Detector 1A 1W mC Diagnostics CTRL R2 FB Supply VIN EN/DIM PWM_DIM 200 kW RSET R1 GND PGND Shutdown Delay System EN/SD I1 Drive Control IRSETx100 I2 I3 I4 LED1 LED2 LED3 LED4 0 - 175 mA R3 LED1 C3 LED Cluster N_Series M_Parallel
R5 SW OVP Controller 1 MHz PWM Controller
VFMAX
LEDn
300 mV
Figure 24. CAT4106 Simplified Functional Block Diagram
http://onsemi.com
9
CAT4106
Device Operation In a typical application, the CAT4106 drives an LED array consisting of up to four separate strings. A single external resistor value is used to select the drive level in all output channels. Each channel provides a very well regulated and tightly matched bias current on all LED strings. An integrated DC/DC boost converter is used to generate the high voltage output required to power the LED strings. Up to a maximum of 6 W of LED power can be delivered when powered from a 12 V supply. To offer improved performance, the device also allows the user to set the operating voltage level on the output drive channels. A pair of external resistors is used to control the nominal channel voltage, during normal operation. The resulting output voltage (LED anodes) will be equal to the sum of the adjusted channel voltage plus the maximum forward voltage present on any string. The CAT4106 provides four tightly matched current sinks to accurately regulate LED current in each channel. Up to 175 mA per channel can be programmed by selecting a suitable value for the external R1 resistor (connected between RSET and GND pins).
LED Current Setting LED Detection
The CAT4106 detects failure conditions related to the LED load, such as if one of the LED strings has been disconnected (Open-LED) or if one LED string has a lower LED pin voltage than expected (Short-LED). Either condition is flagged by turning on the open-drain output on the FAULT pin. The Open-LED detection is active in normal operation. The Short-LED detection is only active during power-up, just after the EN/PWM input goes from low to high. If in normal operation (LEDs are in regulation) a short-LED condition occurs, it will not be detected.
The CAT4106 provides four tightly matched current sinks to accurately regulate LED current in each channel. The LED current is set by the external resistor R1 connected between the RSET pin and ground. The following formula gives the relationship between the resistor value and the LED current per channel.
R1 [ 103 1.2 V LED current per channel
Figure 25. Cold Power-Up Short-LED Detection
Table 6. RESISTOR R1 AND LED CURRENT
LED Current per Channel (mA) 10 20 30 50 100 150 R1 (W) 12.4 k 6.19 k 4.12 k 2.49 k 1.24 k 820
Figure 26. Normal Operation Open-LED Detection
The test condition in Figure 25 is with one LED pin shorted to the output (top LED anode). The test condition in Figure 26 is with one LED pin floating or disconnected. In both cases, the CAT4106 is set to drive 50 mA per channel.
Setting VFMIN Level (Short-LED)
Setting the Channel Voltage
Each LED channel typically requires less than 0.5 V of headroom for full load operation. The lowest channel operating voltage can be controlled and programmed via the external resistor network connected between, CTRL, FB and GND as shown in Figure 24.
Lowest LED pin voltage + V FB R2 ) R3 R3
For most applications, a gain of 2x (R2 equals R3) is recommended. The CTRL output pin has optimal performance when loaded with around 15 mA, which equates to an R3 resistor value of 20 kW.
The VFMIN level represents the minimum level expected for the LED string voltage "window of operation". This voltage setting is based on the number of series LEDs being used and the expected minimum forward voltage VF during normal operation. Example: Consider a string of 6 LEDs in series, with each LED having a VF range of 3.5 V 0.5 V. Since the minimum VF of each LED is 3.0 V the overall lowest expected string voltage would be 18 V. Any string voltage of less than 18 V is considered as a short-circuit fault in one or more of the series LEDs.
http://onsemi.com
10
CAT4106
The external resistor R6 value needed to set a VFMIN level of 18 V is calculated as follows:
R6 + R7 18 V *1 1.2 V
For R7 = 20 kW, R6 = 280 kW.
Setting VFMAX Level (Open-LED)
The VFMAX level represents the maximum level expected for the LED string voltage "window of operation". This voltage setting is based on the number of series LEDs being used and the expected maximum VF during normal operation. Example: Consider a string of 6 LEDs in series, with each LED having a VF range of 3.5 V 0.5 V. Since the maximum VF of each LED is 4.0 V, the overall maximum expected string voltage would be 24 V. Any string voltage which appears greater than 24 V would be considered as containing an open-circuit in one or more of the series LEDs. The external resistor R4 value needed to set a VFMAX level of 24 V is calculated as follows:
R4 + R5 24 V *1 1.2 V
During PWM dimming, the recommended minimum pulse width interval (either High or Low) is 0.2 ms. The recommended maximum pulse width during PWM dimming is 2.5 ms, however this only applies to the Low pulse interval. Pulse durations extending past 2.5 ms may cause the device to enter full shutdown mode. The LED channel response time is much longer if the device has been in shutdown mode. For most applications, a maximum dimming resolution can be achieved with PWM clock frequencies in the range of 100 Hz to 2 kHz. Pulse width intervals of 1 ms, allows up to 1000:1 dimming ratio at 1 kHz PWM frequency.
One or Two LED String Applications
The CAT4106 can be used to drive one or two strings of LEDs by connecting together some LED pins. Also for applications requiring LED current greater than 175 mA, LED channels can be tied together, assuming the supply is suitable to drive the load. Figure 27 shows a typical application for driving a single string of LEDs. The LED current is equal to four times the channel current.
VL C2 VIN C1 OFF... ON... DIM... R2 VIN L D C3 R4 SW VFMAX VFMIN CAT4106 LED1 LED2 LED3 LED4 VCTRL FAULT FB GND PGND EN/PWM RSET R5 R7 R6
For R5 = 20 kW, R4 = 380 kW. In normal operation, the LED string which has the largest VF will be used to set the VCTRL/VFB voltage levels. If the largest string voltage tries to exceed VFMAX setting, it will no longer be allowed to control the voltage level of VCTRL/VFB (i.e. it will be ignored) and subsequently the next largest LED string voltage will then be used in the control loop. All remaining functional LED channels will continue to operate as normal. If a disconnected LED string is reconnected, the FAULT flag remains on and the channel disabled until the device has been re-enabled with the EN pin going from low to high. If all LED channels are detected as being open-circuit, then the boost converter will limit the output voltage to the VFMAX setting. This eliminates the need for an external protection zener.
Enable and PWM Dimming Control
VIN R8 LED Fault Detection (open drain pull-down)
R1
R3
Figure 27. Application Circuit for One LED String
Figure 28 shows a typical application for driving two strings of LEDs. The LED current is equal to two times the channel current.
VL C2 VIN C1 OFF... ON... DIM... R2 LED1 LED2 LED3 LED4 VCTRL FAULT FB GND PGND EN/PWM RSET VIN L D C3 R4 SW VFMAX VFMIN CAT4106 R5 R7 R6
EN/PWM input signal provides two independent functions. The first function is to enable and disable the entire device. The second function is to apply PWM dimming on the output channels while the chip remains fully enabled. Applying logic high on the EN/PWM input will power up the device. The device will continue to remain powered up, even in the presence of PWM signals being applied. To disable the device into complete system shutdown mode, a logic low must be applied to the EN/PWM input for typically 5 ms. The duty cycle applied at the EN/PWM is directly applied to all the output channels. Each time the input is taken low, all output channels will immediately be switched off and the channels will resume normal operation when the PWM is taken back high. The response time of the channels when switching ON or OFF is typically 0.2 ms.
VIN R8 LED Fault Detection (open drain pull-down)
R1
R3
Figure 28. Application Circuit for Two LED Strings
http://onsemi.com
11
CAT4106
Application Information
External Component Selection Capacitors Recommended Layout
The CAT4106 requires small ceramic capacitors of 1 mF on the VIN pin (C1), 4.7 mF on the inductor input (C2), and 10 mF on the output (C3). Under normal condition, a 4.7 mF input capacitor (C2) is sufficient. The voltage rating of each capacitor should be compatible with the maximum voltage applied. For the output, a 50 V rated capacitor (C3) is recommended in case the LED becomes disconnected (Open-LED condition). X5R and X7R capacitor types are ideal due to their stability across temperature range.
Inductor
The board layout should provide good thermal dissipation through the PCB. Multiple via can be used to connect the tab of the CAT4106 to a large ground plane underneath the package. Input capacitor C1 should be placed as close to the driver IC as possible. The RSET resistor (R1) and channel voltage setting resistor (R3) should have a Kelvin connection to the GND pin of the CAT4106.
A 47 mH inductor is recommended for most applications. In cases where the efficiency is critical, inductances with lower series resistance are preferred. Inductors with current rating of 1 A or higher are recommended for most applications. Coilcraft CR73-470 inductor rated at 1.08 A is recommended for most applications.
Schottky Diode
The current rating of the Schottky diode (D) must exceed the peak current flowing through it. A 1 A rated Schottky diode is recommended. The Schottky diode performance is rated in terms of its forward voltage at a given current. In order to achieve the best efficiency, this forward voltage should be as low as possible. The response time is also critical since the driver is operating at 1 MHz. NXP PMEG6010CEJ (60 V / 1 A rated) Schottky barrier rectifier is recommended for most applications.
Figure 29. Recommended Layout for TQFN-16
http://onsemi.com
12
CAT4106
PACKAGE DIMENSIONS
TQFN16, 4x4 CASE 510AE-01 ISSUE A
D A
DETAIL A
E
E2
PIN#1 ID
PIN#1 INDEX AREA TOP VIEW
A1 SIDE VIEW
D2
BOTTOM VIEW
SYMBOL A A1 A3 b D D2 E E2 e L
MIN 0.70 0.00 0.25 3.90 2.00 3.90 2.00 0.45
NOM 0.75 0.02 0.20 REF 0.30 4.00 --- 4.00 --- 0.65 BSC ---
MAX 0.80 0.05 0.35 4.10 2.25 4.10 2.25 0.65 A L DETAIL A b e
Notes: (1) All dimensions are in millimeters. (2) Complies with JEDEC MO-220.
A1 FRONT VIEW
A3
http://onsemi.com
13
CAT4106
PACKAGE DIMENSIONS
TSSOP16, 4.4x5 EXPOSED PAD CASE 948AP-01 ISSUE A
b c X
E1 E
Y
L1 PIN#1 IDENTIFICATION TOP VIEW D A2 A e 1 END VIEW
L
EXPOSED THERMAL PAD ZONE BOTTOM VIEW X 0.076
SIDE VIEW SYMBOL A A1 A2 b c D E E1 e L L1 N P R S MIN 0.05 0.85 0.19 0.13 4.90 6.30 4.30 0.65 BSC 1.00 REF 0.45 0.90 6.50 4.60 0.37 0.75 1.00 6.70 4.80 0.47 NOM MAX 1.10 0.15 0.95 0.30 0.20 5.10 6.50 4.50
A1
Y 0.076 P R
S
e
N
0
2.74 REF 2.74 REF
8
X Y
LAND PATTERN Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-153 variations ABT.
http://onsemi.com
14
CAT4106
Example of Ordering Information (Note 7)
Prefix CAT Device # 4106 Suffix HV4 -G T2
Company ID (Optional)
Product Number 4106
Package HV4: TQFN 16-Pad YP: TSSOP 16-Lead (Note 6) YP: Exposed Thermal Pad
Lead Finish G: NiPdAu Blank: Matte-Tin
Tape & Reel (Note 9) T: Tape & Reel 2: 2,000 / Reel
4. 5. 6. 7. 8. 9.
All packages are RoHS-compliant (Lead-free, Halogen-free). The standard plated finish is NiPdAu. TSSOP only available in Matte-Tin plated finish. The device used in the above example is a CAT4106HV4-GT2 (TQFN, NiPdAu, Tape & Reel, 2,000/Reel). For additional temperature options, please contact your nearest ON Semiconductor Sales office. For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
http://onsemi.com
15
CAT4106/D

▲Up To Search▲

Price & Availability of CAT4106HV4-GT2

	To Download CAT4106HV4-GT2 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .