L4981AD Power Factor Corrector Loveminer A1 PSU Repair
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L4981AD Power Factor Corrector for Loveminer A1 PSU
The L4981AD is a power factor correction (PFC) controller IC designed for the Loveminer / Aixin A1 power supply. It delivers active PFC up to 0.99 power factor, with universal input mains regulation and line current distortion below 5% — restoring full power-quality compliance on rebuilt A1 PSUs.
Integrated MOSFET gate driver, voltage reference, error amplifier, undervoltage lockout, current sensing and soft-start simplify the boost-stage layout. Two variants exist: L4981A fixed-frequency and L4981B modulated-frequency for optimised input-filter size.
Typical Failure Modes Solved
- PFC failure / no DC bus voltage — high-voltage rail at primary stage stays low or zero.
- Power factor out of spec — A1 PSU pulls dirty current after a transient event.
- Soft-start fault — PSU trips on inrush at every restart.
- Production refurbishment — bulk IC stock for A1 rebuild lines.
L4981AD Specifications
| Parameter | Specification |
|---|---|
| Part Number | L4981AD (L4981A / L4981B variants) |
| Function | Power Factor Corrector controller |
| Power Factor | Up to 0.99 |
| Line Current Distortion | <5% |
| Input Mains | Universal regulation |
| Gate Driver | Integrated MOSFET driver |
| Protection | UVLO + soft-start + current sensing |
| Compatible PSU | Loveminer / Aixin A1 |
| Condition | Brand New |
FAQ — L4981AD PFC Controller
Q: L4981A vs L4981B — which version?
A: L4981A runs fixed-frequency; L4981B modulates the frequency to shrink the EMI input filter. For OEM-spec A1 repair, match the original part marking.
Q: Symptoms of a dead PFC controller?
A: No high-voltage DC bus after rectifier stage, PSU stays in standby, or the unit trips on inrush. Probe gate drive on the boost MOSFET to confirm no switching activity.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com.
Related products
- Lovecore Aixin A1 PSU TT240015P Rectifier
- FAN7930C PFC Controller
- NCP1397AG LLC Controller – Lovecore / Aisen
- 25V 650µF Solid Capacitor – Loveminer A1
A1 PSU rebuild shops stocking L4981AD? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouses.
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