Datasheet LTC3805-5 (Analog Devices) - 20
| Hersteller | Analog Devices |
| Beschreibung | Adjustable Frequency Current Mode Flyback/Boost/SEPIC DC/DC Controller |
| Seiten / Seite | 20 / 20 — TYPICAL APPLICATION. 5V to 40V to 12V/1A Nonisolated Flyback Converter. … |
| Dateiformat / Größe | PDF / 265 Kb |
| Dokumentensprache | Englisch |
TYPICAL APPLICATION. 5V to 40V to 12V/1A Nonisolated Flyback Converter. Efficiency and Power Loss. vs Load Current
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LTC3805-5
TYPICAL APPLICATION 5V to 40V to 12V/1A Nonisolated Flyback Converter
D1 UPS840 T3772 V V 4 7 OUT IN 12V 5V TO 40V 8 2.2µF 1A 2.2µF 10k D2 10 100V 100V BAS516 1 9 100µF 100µF MMBTA42 16V 16V 6.8V PDZ6.8B 680Ω 150pF 200V 220Ω CSS 47pF 100pF 0.1µF 51.1k FDC2512 VCC R 470pF SENSE 20k 4.7µF U1 0.005Ω 3.65k LTC3805-5 1 10 SSFLT GATE 2 9 I V 3 TH CC 8 FB OC 4 7 VCC RUN I 5 SENSE 6 FS GND SYNC 3.01k 75k 11 38055 TA02
Efficiency and Power Loss vs Load Current
90 8 80 7 70 6 POWER LOSS (W) 60 5 50 4 EFFICIENCY (%) 40 3 5.5V 30 2 10V 20V 20 1 30V 40V 10 0 0.01 0.1 1 10 LOAD CURRENT (A) 38055 TA02b
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
LT3748 100V No Opto Flyback Controller 5V ≤ VIN ≤ 100V, Boundary Mode Operation, MSOP-16 with Extra High Voltage Pin Spacing LT3758 Boost, Flyback, SEPIC and Inverting Controller 5.5V ≤ VIN ≤ 100V, 100kHz to 1MHz Programmable Operating Frequency, 3mm × 3mm DFN-10 and MSOP-10E LT3575 No Opto-Isolated Flyback with 60V Integrated Switch 3V ≤ VIN ≤ 40V, Up to 14W, Boundary Mode Operation, TSSOP-16E LTC3803/LTC3803-3/ Flyback DC/DC Controller with Fixed 200kHz or VIN and VOUT Limited Only by External Components, 6-Pin ThinSOT™ LTC3803-5 300kHz Operating Frequency Package LTC3873/LTC3873-5 No RSENSE™ Constant Frequency Flyback, Boost, VIN and VOUT Limited Only by External Components, 8-Pin ThinSOT SEPIC Controller or 2mm × 3mm DFN-8 Packages LT3825 No Opto-Isolated Synchronous Flyback Controller VIN 16V to 75V Limited by External Components, Up to 60W, TSSOP-16E 38055fe 20 Linear Technology Corporation LT 0511 REV E • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2008 Document Outline Features Applications Description Typical Application 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 APPLICATION 5V to 40V to 12V/1A Nonisolated Flyback Converter
D1 UPS840 T3772 V V 4 7 OUT IN 12V 5V TO 40V 8 2.2µF 1A 2.2µF 10k D2 10 100V 100V BAS516 1 9 100µF 100µF MMBTA42 16V 16V 6.8V PDZ6.8B 680Ω 150pF 200V 220Ω CSS 47pF 100pF 0.1µF 51.1k FDC2512 VCC R 470pF SENSE 20k 4.7µF U1 0.005Ω 3.65k LTC3805-5 1 10 SSFLT GATE 2 9 I V 3 TH CC 8 FB OC 4 7 VCC RUN I 5 SENSE 6 FS GND SYNC 3.01k 75k 11 38055 TA02
Efficiency and Power Loss vs Load Current
90 8 80 7 70 6 POWER LOSS (W) 60 5 50 4 EFFICIENCY (%) 40 3 5.5V 30 2 10V 20V 20 1 30V 40V 10 0 0.01 0.1 1 10 LOAD CURRENT (A) 38055 TA02b
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
LT3748 100V No Opto Flyback Controller 5V ≤ VIN ≤ 100V, Boundary Mode Operation, MSOP-16 with Extra High Voltage Pin Spacing LT3758 Boost, Flyback, SEPIC and Inverting Controller 5.5V ≤ VIN ≤ 100V, 100kHz to 1MHz Programmable Operating Frequency, 3mm × 3mm DFN-10 and MSOP-10E LT3575 No Opto-Isolated Flyback with 60V Integrated Switch 3V ≤ VIN ≤ 40V, Up to 14W, Boundary Mode Operation, TSSOP-16E LTC3803/LTC3803-3/ Flyback DC/DC Controller with Fixed 200kHz or VIN and VOUT Limited Only by External Components, 6-Pin ThinSOT™ LTC3803-5 300kHz Operating Frequency Package LTC3873/LTC3873-5 No RSENSE™ Constant Frequency Flyback, Boost, VIN and VOUT Limited Only by External Components, 8-Pin ThinSOT SEPIC Controller or 2mm × 3mm DFN-8 Packages LT3825 No Opto-Isolated Synchronous Flyback Controller VIN 16V to 75V Limited by External Components, Up to 60W, TSSOP-16E 38055fe 20 Linear Technology Corporation LT 0511 REV E • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2008 Document Outline Features Applications Description Typical Application 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