LakeSemi active PFC controllers LS2806 / LS2806A are quasi-resonant Boost constant-voltage PFC controllers: full load in critical conduction mode (CRM), automatically folding back to discontinuous mode (DCM) at light load for higher efficiency, valley turn-on with a 500 kHz frequency clamp, power factor >0.95 and THD <10%. Integrated demagnetization detection supports single-winding Boost inductors; built-in line-voltage feedforward and a ±1.5% voltage reference; light-load frequency foldback plus Burst mode drives standby losses to a minimum. Protections cover VDD OVP/UVLO, BOP, UVP, dual-level OVP, cycle-by-cycle OCP, AOCP, OTP and pin open/short. The LS2806 additionally offers Boost Follower dual-level output voltage for extra efficiency across wide input ranges. The first choice for adapters, LED lighting and PC / TV / game-console offline PFC front-ends — click below to download the official datasheet (PDF) for each part.
| Part Number | Operation Mode | Max Freq Clamp | PF / THD | Boost Follower | Package | Positioning |
|---|---|---|---|---|---|---|
| LS2806 | CRM / DCM adaptive | 500 kHz | >0.95 / <10% | Yes (dual-level output) | SOT23-6 | Full-feature · wide-range optimized |
| LS2806A | CRM / DCM adaptive | 500 kHz | >0.95 / <10% | No | SOT23-6 | Classic · single-level output |
QR Boost PFC Controller · CRM/DCM Adaptive · 500 kHz · Boost Follower
| Topology / Mode | Quasi-resonant Boost · CRM / DCM adaptive switching |
|---|---|
| Max Frequency Clamp | 500 kHz · valley turn-on (QR) |
| Power Factor / THD | PF > 0.95 · THD < 10% |
| Reference Accuracy | ±1.5% (@Tj=25°C) |
| Startup Current / VDD ON | 20 µA (typ.) / 10.7 V |
| Dual-Level Output (Boost Follower) | Yes · VREF_H 2.5 V / VREF_L 1.7 V |
| Light-Load Optimization | Frequency foldback + Burst mode · ultra-low standby |
| Protections | VDD OVP/UVLO · BOP · UVP · dual-level OVP · cycle-by-cycle OCP · AOCP · OTP · pin open/short |
| Package | SOT23-6 · single-winding Boost inductor supported (integrated demag detection) |
Typical Apps: Adapter power supplies · LED lighting · desktop PC / DTV / game consoles · offline PFC front-end
Download Datasheet (V1.0, CN, PDF) ↓QR Boost PFC Controller · CRM/DCM Adaptive · 500 kHz · Single-Level Output
| Topology / Mode | Quasi-resonant Boost · CRM / DCM adaptive switching |
|---|---|
| Max Frequency Clamp | 500 kHz · valley turn-on (QR) |
| Power Factor / THD | PF > 0.95 · THD < 10% |
| Reference Accuracy | ±1.5% (@Tj=25°C) |
| Startup Current / VDD ON | 20 µA (typ.) / 10.7 V |
| Output Voltage Setting | Single level VREF 2.5 V (no Boost Follower) |
| Light-Load Optimization | Frequency foldback + Burst mode · ultra-low standby |
| Protections | VDD OVP/UVLO · BOP · UVP · dual-level OVP · cycle-by-cycle OCP · AOCP · OTP · pin open/short |
| Package | SOT23-6 · single-winding Boost inductor supported (integrated demag detection) |
Typical Apps: Adapter power supplies · LED lighting · desktop PC / DTV / game consoles · offline PFC front-end
Download Datasheet (V1.0, CN, PDF) ↓