FA5527 Current Mode Switching Power Supply Control IC

FA5527 Current-Mode SMPS Controller IC for PSU Repair

Repair your power supply with the FA5527 current-mode switching power supply control IC. This advanced IC directly drives power MOSFETs, providing efficient power management for SMPS / mining PSU primary stages.

Built on a high-breakdown-voltage CMOS process, achieving low power consumption and energy efficiency. The built-in 500V breakdown voltage startup circuit reduces standby power consumption — compact and cost-effective power supply solution. 100 kHz typical oscillation frequency with latch-mode and automatic-recovery overload cut-off functions for robust fault protection.

Key Features

• Built-in 500V breakdown voltage starting circuit for reduced standby power.
• High-breakdown-voltage CMOS process for low power consumption.
• 100 kHz typical oscillation frequency.
• Latch-mode overload cut-off function.
• Overload automatic-recovery cut-off function.
• Direct power MOSFET drive.

Typical Use in PSU Repair

• Mining PSU auxiliary rail controller — standby / housekeeping supplies needing 500V startup.
• General SMPS controller replacement — flyback / forward designs at low-to-medium power.
• Adapter / charger repair — efficient power adapter primary control.
• Production refurbishment — bulk SMPS controller inventory for PSU rebuild workflow.

FA5527 Specifications

FAQ — FA5527 SMPS Controller

Q: FA5527 vs FA8A01N — which to choose?
A: Both are current-mode SMPS controllers with 500V startup, but feature sets differ slightly. FA5527 emphasizes latch + auto-recovery overload protection. FA8A01N emphasizes X-cap discharge + burst mode for ultra-low standby. Match the part to your existing PCB design — substitution depends on pinout compatibility.

Q: How do I diagnose a failed FA5527 on PSU?
A: Typical signs: PSU won't start, no gate-drive signal at primary MOSFET, audible burn smell from the IC. Verify by checking VCC at the controller pin — if present but no gate drive, IC likely failed.

Q: What does "latch mode" overload cut-off mean?
A: Under overload, the controller can either auto-recover (try again after a delay) or latch off (require manual reset / power cycle). The FA5527 supports both modes — choice depends on application design.

Q: Bulk pricing for PSU repair shops?
A: Yes — email contact@lys-sz.com with your monthly PSU repair volume for tier pricing on FA5527 by the tube.

Related products

• FA8A01N Current-Mode SMPS Controller
• UC2842B Current-Mode Controller – PSU Repair
• TOP247YN Offline Flyback Converter – TO-220-7C
• NCP1397AG LLC Controller – Lovecore Aisen A1

PSU repair shops stocking FA5527 by the tube? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouses.