Datasheet LTC1871-1 (Analog Devices) - 33
| Fabricante | Analog Devices |
| Descripción | Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller |
| Páginas / Página | 36 / 33 — TYPICAL APPLICATIONS. 4.5V to 28V Input, 5V/2A Output SEPIC Converter … |
| Formato / tamaño de archivo | PDF / 538 Kb |
| Idioma del documento | Inglés |
TYPICAL APPLICATIONS. 4.5V to 28V Input, 5V/2A Output SEPIC Converter with Undervoltage Lockout and Soft-Start. Soft-Start
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LTC1871-1
TYPICAL APPLICATIONS 4.5V to 28V Input, 5V/2A Output SEPIC Converter with Undervoltage Lockout and Soft-Start
VIN R1 • 4.5V to 28V C 115k DC 2.2μF R2 1% L1* 25V 54.9k C1 X5R 1% 4.7nF 1 10 ×3 RUN SENSE D1 VOUT 2 9 5V ITH VIN 2A RC LTC1871-1 + C (3A TO 4A PEAK) OUT1 12k 3 8 330μF FB INTVCC C R4 6.3V OUT2 C 4 7 C1 22μF 49.9k FREQ GATE M1 L2* 8.2nF C C 6.3V 1% 5 6 VCC IN1 + R3 R C T MODE/SYNC GND 4.7μF 2.2μF IN2 X5R CC2 154k 162k • 10V 35V 22μF 47pF 1% 1% X5R X5R 35V GND 18711 TA02a R5 C2 100Ω 1μF NOTES: Q1 X5R 1. VIN UVLO+ = 4.17V R6 VIN UVLO– = 3.86V 750Ω 2. SOFT-START dVOUT/dt = 5V/6ms CIN1, CDC: TAIYO YUDEN GMK325BJ225MN D1: INTERNATIONAL RECTIFIER 30BQ040 CIN2: AVX TPSE226M035R0300 L1, L2: BH ELECTRONICS BH510-1007 (*COUPLED INDUCTORS) COUT1: SANYO 6TPB330M M1: SILICONIX/VISHAY Si4840 COUT2: TAIYO YUDEN JMK325BJ226MN Q1: PHILIPS BC847BF CVCC: LMK316BJ475ML
Soft-Start Load Step Response at VIN = 4.5V
VOUT 100mV/DIV (AC) VOUT 1V/DIV 2.2A IOUT 1A/DIV (DC) 0.5A 1ms/DIV 18711 TA02b 250μs/DIV 18711 TA02c
Load Step Response at VIN = 28V
VOUT 100mV/DIV (AC) 2.2A IOUT 1A/DIV (DC) 0.5A 250μs/DIV 18711 TA02d 18711fb 33
TYPICAL APPLICATIONS 4.5V to 28V Input, 5V/2A Output SEPIC Converter with Undervoltage Lockout and Soft-Start
VIN R1 • 4.5V to 28V C 115k DC 2.2μF R2 1% L1* 25V 54.9k C1 X5R 1% 4.7nF 1 10 ×3 RUN SENSE D1 VOUT 2 9 5V ITH VIN 2A RC LTC1871-1 + C (3A TO 4A PEAK) OUT1 12k 3 8 330μF FB INTVCC C R4 6.3V OUT2 C 4 7 C1 22μF 49.9k FREQ GATE M1 L2* 8.2nF C C 6.3V 1% 5 6 VCC IN1 + R3 R C T MODE/SYNC GND 4.7μF 2.2μF IN2 X5R CC2 154k 162k • 10V 35V 22μF 47pF 1% 1% X5R X5R 35V GND 18711 TA02a R5 C2 100Ω 1μF NOTES: Q1 X5R 1. VIN UVLO+ = 4.17V R6 VIN UVLO– = 3.86V 750Ω 2. SOFT-START dVOUT/dt = 5V/6ms CIN1, CDC: TAIYO YUDEN GMK325BJ225MN D1: INTERNATIONAL RECTIFIER 30BQ040 CIN2: AVX TPSE226M035R0300 L1, L2: BH ELECTRONICS BH510-1007 (*COUPLED INDUCTORS) COUT1: SANYO 6TPB330M M1: SILICONIX/VISHAY Si4840 COUT2: TAIYO YUDEN JMK325BJ226MN Q1: PHILIPS BC847BF CVCC: LMK316BJ475ML
Soft-Start Load Step Response at VIN = 4.5V
VOUT 100mV/DIV (AC) VOUT 1V/DIV 2.2A IOUT 1A/DIV (DC) 0.5A 1ms/DIV 18711 TA02b 250μs/DIV 18711 TA02c
Load Step Response at VIN = 28V
VOUT 100mV/DIV (AC) 2.2A IOUT 1A/DIV (DC) 0.5A 250μs/DIV 18711 TA02d 18711fb 33