Green mode Quasi-resonant ICs
-
Status:Available
FA5643 is a quasi-resonant switching power supply control IC with excellent low standby power. Despite its compact 8-pin package, it has a wide variety of functions and reduces the number of external components, thereby enabling the configuration of space-saving and cost-effective power supplies.
Features
- Quasi-resonant switching power supply
- Power supply with excellent standby characteristicsIncorporates a startup circuit to achieve low power consumption
- Low current consumption of 0.85 mA during operation
- Bottom skip count control with on-off width detection
- Light-load burst operation function
- Built-in drive circuit that can directly connect power MOSFETs
- Output current: 0.5 A (sink) / 0.25 A (source)
- Built-in overload protection (spring return)
- Built-in latch protection with secondary overvoltage detection
- Built-in input voltage correction
- Switches between the IS pin’s maximum input threshold voltage and pulse stop FB voltage
- Built-in low-voltage malfunction prevention circuit (14 V ON/8 V OFF)
- Minimum oscillation frequency limiting function: 25 kHz
- IS pin latch stop function
- Package: SOP-8
Applications
- Switching Power Supplies
Specifications
| Controller type | QR |
|---|---|
| Applied circuit Detail | Flyback |
| Frequency (kHz) | Selfoscillation (With control of bottom skips) |
| VCC(V) | 11 to 26 |
| Built-in start up circuit (V) | 500 |
| Over load protection | Auto-Recovery |
| Over voltage protection | Latch (ZCD) |
| Package | SOP-8 |
Documentation Tools
| Reference Design | Power Supply Control IC Reference Design |
|---|---|
| Selection Guide | Power Supply Control IC Selection Guide |
