Datasheet Details
| Part number | LR2257 |
|---|---|
| Manufacturer | LRC |
| File Size | 395.25 KB |
| Description | AC/DC Current Mode PWM |
| Download | LR2257 Download (PDF) |
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Overview: LESHAN RADIO COMPANY, LTD. LR2257 AC/DC Current Mode PWM power management controller The LR2257 AC—DC is a high efficiency current-mode PWM power supply controller that drives an internal NPN transistor for high voltage switching.
| Part number | LR2257 |
|---|---|
| Manufacturer | LRC |
| File Size | 395.25 KB |
| Description | AC/DC Current Mode PWM |
| Download | LR2257 Download (PDF) |
|
|
|
Pin Symbol Pin Description 1 FB Feedback input 2,3 NC Test Pin * 4 VDD Power Supply 5,6 SW Power Transistor output 7,8 GND Ground *Note: Test2 should connect to Test3 while in application 2/9 + - LO HI Working Principle HI HV DC LO 1M GND SW LR2257 12 3 4 PC817A 12 56 7 8 LESHAN RADIO COMPANY, LTD.
LR2257 1 T=114 2 1 1N5817 T=8 2 1 T=24 100uF 10V 2 1N4148 IC2 + 6.2V DC - VDD FB 1N4148 10uF 10V 22uF 35V D6 5.1V 2% T1 T2 Block Diagram FB VDD STARTER OSCILLATOR R1 R2 VOLTAGE REFERENCE + + GN
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