Datasheet LT3797 (Analog Devices) - 30
| Manufacturer | Analog Devices |
| Description | Triple Output LED Driver Controller |
| Pages / Page | 36 / 30 — TYPICAL APPLICATIONS. Triple Buck Mode LED Driver for Common Anode LEDs. … |
| Revision | C |
| File Format / Size | PDF / 381 Kb |
| Document Language | English |
TYPICAL APPLICATIONS. Triple Buck Mode LED Driver for Common Anode LEDs. Efficiency vs VIN. 1000:1 PWM Dimming at 120Hz
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LT3797
TYPICAL APPLICATIONS Triple Buck Mode LED Driver for Common Anode LEDs
CIN1-3 22µF LED1 LED2 LED3 ×6 RED 34k 75k GREEN BLUE 75k VIN FBH1 FBH2 FBH3 –15V TO –9V* 20k 20k 5A 5A 5A 20k ISP1 ISP2 ISP3 0.05Ω 0.05Ω 0.05Ω ISN1 ISN2 ISN3 COUT1 COUT2 COUT3 TG1 M2 22µF ×2 22µF ×2 M4 TG2 TG3 M6 22µF ×2 L1 L2 L3 4.7µH 4.7µH 4.7µH M1 D1 D2 M3 M5 D3 0.1µF 0.1µF 0.1µF (OPTIONAL) 0.01Ω 0.01Ω (OPTIONAL) (OPTIONAL) 0.01Ω VIN VIN VIN GATE1 SENSEP1 SENSEN1 SENSEN2 SENSEP2 GATE2 GATE3 SENSEP3 SENSEN3 TG1-3 VIN C ISN1-3 IN4 200k 10µF LT3797 ISP1-3 EN/UVLO FBH1-3 VIN 18.7k OVLO CTRL1-3 VREF PWM1-3 RT SYNC SS1-3 FLT1-3 SW1 SW2 BOOST INTVCC GND VC1-3 35.7k L INTV 4.7k PWR CC 17.3k 400kHz 0.1µF 47µH 0.1µF 10µF 10nF 8.45k 10k RT1 VIN NTC 3797 TA05 10k Q1 VIN VIN INTV V CC IN 10k D1-D3: ON SEMICONDUCTOR MBRB2515L M1, M3, M5: VISHAY SILICONIX Si4174DY L1-L3: WÜRTH 7443310470 M2, M4, M6: INFINEON BSC130P03LS LED1-LED3: LUMINUS PT39 Q1: DIODES INC. FMMTL718 PWMIN1-3 LPWR: COILTRONICS SD25-470 RT1: MURATA NCP15XH103J03RC *NEGATIVE INPUT VOLTAGE IS NECESSARY BECAUSE THE COMMON ANODES OF THE LEDS OF THIS APPLICATION NEED TO BE CONNECTED TO GND
Efficiency vs VIN 1000:1 PWM Dimming at 120Hz
100 PWMIN1-3 = 5V PWM 95 5V/DIV 90 IL1 5A/DIV 85 I EFFICIENCY (%) LED 80 5A/DIV 75 V 3797 TA05c IN = –12V 5µs/DIV 70–15 –14 –13 –12 –11 –10 –9 VIN (V) 3797 TA05b Rev C 30 For more information www.analog.com Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL APPLICATIONS Triple Buck Mode LED Driver for Common Anode LEDs
CIN1-3 22µF LED1 LED2 LED3 ×6 RED 34k 75k GREEN BLUE 75k VIN FBH1 FBH2 FBH3 –15V TO –9V* 20k 20k 5A 5A 5A 20k ISP1 ISP2 ISP3 0.05Ω 0.05Ω 0.05Ω ISN1 ISN2 ISN3 COUT1 COUT2 COUT3 TG1 M2 22µF ×2 22µF ×2 M4 TG2 TG3 M6 22µF ×2 L1 L2 L3 4.7µH 4.7µH 4.7µH M1 D1 D2 M3 M5 D3 0.1µF 0.1µF 0.1µF (OPTIONAL) 0.01Ω 0.01Ω (OPTIONAL) (OPTIONAL) 0.01Ω VIN VIN VIN GATE1 SENSEP1 SENSEN1 SENSEN2 SENSEP2 GATE2 GATE3 SENSEP3 SENSEN3 TG1-3 VIN C ISN1-3 IN4 200k 10µF LT3797 ISP1-3 EN/UVLO FBH1-3 VIN 18.7k OVLO CTRL1-3 VREF PWM1-3 RT SYNC SS1-3 FLT1-3 SW1 SW2 BOOST INTVCC GND VC1-3 35.7k L INTV 4.7k PWR CC 17.3k 400kHz 0.1µF 47µH 0.1µF 10µF 10nF 8.45k 10k RT1 VIN NTC 3797 TA05 10k Q1 VIN VIN INTV V CC IN 10k D1-D3: ON SEMICONDUCTOR MBRB2515L M1, M3, M5: VISHAY SILICONIX Si4174DY L1-L3: WÜRTH 7443310470 M2, M4, M6: INFINEON BSC130P03LS LED1-LED3: LUMINUS PT39 Q1: DIODES INC. FMMTL718 PWMIN1-3 LPWR: COILTRONICS SD25-470 RT1: MURATA NCP15XH103J03RC *NEGATIVE INPUT VOLTAGE IS NECESSARY BECAUSE THE COMMON ANODES OF THE LEDS OF THIS APPLICATION NEED TO BE CONNECTED TO GND
Efficiency vs VIN 1000:1 PWM Dimming at 120Hz
100 PWMIN1-3 = 5V PWM 95 5V/DIV 90 IL1 5A/DIV 85 I EFFICIENCY (%) LED 80 5A/DIV 75 V 3797 TA05c IN = –12V 5µs/DIV 70–15 –14 –13 –12 –11 –10 –9 VIN (V) 3797 TA05b Rev C 30 For more information www.analog.com Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
