PN8149WSC-A2 Quasi-Resonant Flyback Controller for Antminer APW17 PSU Repair
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PN8149WSC-A2 Quasi-Resonant Flyback Controller | Integrated 800V MOSFET for Antminer APW17 PSU Repair
The PN8149WSC-A2 is a high-performance power management IC used in the Antminer APW17 power supply. Integrates a quasi-resonant current-mode controller together with an internal 800V high-avalanche-capability MOSFET — a single-chip solution for the AC-DC switching stage. Quasi-resonant operation reduces switching losses and EMI, improving overall power efficiency.
Built-in high-voltage startup eliminates external startup resistors, simplifying PSU design and reducing standby power consumption to under 50mW at 230VAC no-load. SOP-12 package with optimised HV/LV pin layout meets the creepage distance requirements for 800V switching in compact PSU designs.
When to Replace the PN8149WSC-A2
- APW17 PSU no output — controller dead, primary switching stage offline.
- Latched protection tripping — overload (OLP), over-temperature (OTP), or over-voltage (OVP) firing during normal operation.
- PSU startup failure — high-voltage startup circuit degraded, controller can't wake up.
- Visible damage on the SOP-12 package — burnt or cracked after a fault event.
- Secondary rectifier short or output overvoltage already confirmed — replace the controller if it also took damage in the same event.
PN8149WSC-A2 Specifications
| Parameter | Specification |
|---|---|
| Part Number | PN8149WSC-A2 |
| Package | SOP-12 |
| Controller Type | Quasi-Resonant Flyback (Current Mode) |
| Integrated MOSFET | 800V High-Avalanche Capability |
| Maximum Switching Frequency | 125kHz |
| Startup Method | Built-in HV startup (no external resistors) |
| Standby Power Consumption | <50mW @ 230VAC no-load |
| Creepage Distance Design | Optimised HV/LV pin layout |
| Protection | OTP, OVP, OCP cycle-by-cycle, OLP, short-circuit (output + secondary rectifier) |
| Primary Application | Antminer APW17 PSU repair |
| Weight | 3g |
| Condition | Brand New |
FAQ — PN8149WSC-A2 Flyback Controller
Q: How do I confirm the controller is the failed part?
A: Power off. Visual inspection for cracking / burn marks on the SOP-12 package. With board powered, measure VCC pin — should be in spec when bias supply is healthy. Scope the DRAIN pin for switching activity during startup. Stuck off or stuck on = chip failed.
Q: Can the integrated MOSFET be replaced separately?
A: No — MOSFET and controller are integrated on the same die in this package. If either fails, the whole IC needs replacing. That's also why the chip is failure-prone after surge events.
Q: SOP-12 rework profile?
A: Preheat to 100°C, hot air at 320°C. Verify pin 1 orientation before reflow. The integrated MOSFET adds thermal mass to the package — allow extra dwell time vs a standard SOP-12.
Q: Bulk pricing for APW17 repair benches?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities.
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APW17 PSU repair benches stocking PN8149WSC-A2 in tape-and-reel volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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