Datasheet LT1776 (Analog Devices) - 17
| Manufacturer | Analog Devices |
| Description | Wide Input Range, High Efficiency, Step-Down Switching Regulator |
| Pages / Page | 20 / 17 — TYPICAL APPLICATIONS. (a). (b). Figure 7. Burst Mode Operation … |
| File Format / Size | PDF / 235 Kb |
| Document Language | English |
TYPICAL APPLICATIONS. (a). (b). Figure 7. Burst Mode Operation Configuration for High Efficiency at Light Load
Model Line for this Datasheet
Text Version of Document
LT1776
U TYPICAL APPLICATIONS
VIN + 5 C1 VIN 6 2 R7 SYNC VCC 10M L1 3 VOUT VSW + 5V U1 R1 D1 C2 Q1 LT1776 39k PN2484 5% 7 FB 1 8 SHDN VC R2 GND C3 10k Q2* 100pF 5% 2N2369 4 NC 7 R3 323k V + 1% 8 4 OUT IN – 3 IN + U2 C1: PANASONIC HFQ 39µF AT 63V R5 LTC1440 6 C2: AVX D CASE 100µF 10V REF 22k R4 TPSD107M010R0080 5 HYST 100k D1: MOTOROLA 100V, 1A, 1% SMD SCHOTTKY V – GND R6 MBRS1100 (T3) 2 1 2.4M L1: COILCRAFT DO3316-104 *ANY NPN WITH EMITTER-BASE 1776 F07a BREAKDOWN OF <7V CAN BE USED
(a)
90 80 VIN = 10V 70 VIN = 40V 60 VIN = 30V VIN = 20V 50 EFFICIENCY (%) 40 30 20 1 10 100 1000 LOAD CURRENT (mA) 1776 F07b
(b) Figure 7. Burst Mode Operation Configuration for High Efficiency at Light Load
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U TYPICAL APPLICATIONS
VIN + 5 C1 VIN 6 2 R7 SYNC VCC 10M L1 3 VOUT VSW + 5V U1 R1 D1 C2 Q1 LT1776 39k PN2484 5% 7 FB 1 8 SHDN VC R2 GND C3 10k Q2* 100pF 5% 2N2369 4 NC 7 R3 323k V + 1% 8 4 OUT IN – 3 IN + U2 C1: PANASONIC HFQ 39µF AT 63V R5 LTC1440 6 C2: AVX D CASE 100µF 10V REF 22k R4 TPSD107M010R0080 5 HYST 100k D1: MOTOROLA 100V, 1A, 1% SMD SCHOTTKY V – GND R6 MBRS1100 (T3) 2 1 2.4M L1: COILCRAFT DO3316-104 *ANY NPN WITH EMITTER-BASE 1776 F07a BREAKDOWN OF <7V CAN BE USED
(a)
90 80 VIN = 10V 70 VIN = 40V 60 VIN = 30V VIN = 20V 50 EFFICIENCY (%) 40 30 20 1 10 100 1000 LOAD CURRENT (mA) 1776 F07b
(b) Figure 7. Burst Mode Operation Configuration for High Efficiency at Light Load
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