NCP1654BD65R2G 54B65 High Performance Power Factor Correction SO8
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NCP1654BD65R2G 54B65 PFC Controller SO8 for ASIC Miner PSU Repair
The NCP1654BD65R2G (on-package marking 54B65) is a power factor correction controller in an SO8 package designed to deliver high power-factor efficiency on offline ASIC miner PSUs and similar high-power switching supplies. The architecture is optimised to reduce the number of external components, simplifying PFC stage layout while still embedding the latest high-security protection features.
On a mining-grade PSU, the PFC controller drives the boost converter that follows the bridge rectifier and bulk capacitor. When this IC fails the PSU usually produces no high-voltage bus, no main output, and only the standby LED responds.
Specifications
| Parameter | Value |
|---|---|
| Part number | NCP1654BD65R2G |
| On-package marking | 54B65 |
| Condition | New |
| Function | Power factor correction (PFC) controller |
| Package | SO8 |
| External component count | Reduced (architecture-optimised) |
| Protections | High-security protection features integrated |
| Application | ASIC miner PSU PFC stage repair |
Where the NCP1654 sits in a PSU
Inside an ASIC miner PSU, the NCP1654BD65R2G runs the boost-PFC stage that lifts the rectified mains voltage up to a regulated high-voltage DC bus (typically around 380-400V). Its job is to shape the input current to track the AC line, keeping power factor high and harmonics low. The PFC output then feeds the main DC-DC stage that produces the miner's regulated low-voltage output.
Compatibility
Drop-in replacement for the NCP1654BD65R2G / 54B65 socket on ASIC miner PSU PFC stages using the SO8 footprint. After replacing the controller, inspect upstream and downstream parts (PFC MOSFETs, PFC inductor, start-up resistors, auxiliary supply) — a failed PFC controller is usually a symptom rather than a root cause.
Common failure symptoms
- PSU produces no main output — high-voltage bus stays at the rectified AC peak with no boost action
- Standby LED lights up but the main rail never enables
- PFC MOSFETs show signs of damage propagated to the controller
- Burn or visible cracking around the SO8 package
- Hiccup behaviour at start-up with PFC inductor never switching cleanly
Frequently asked questions
Is the 54B65 marking the same as NCP1654BD65R2G?
Yes. 54B65 is the on-package marking; NCP1654BD65R2G is the full ordering part number for the same SO8 PFC controller.
What else should I check after a PFC IC failure?
Inspect the PFC MOSFETs, the boost inductor, start-up resistors and the auxiliary supply that feeds the IC's Vcc. A failed PFC controller is usually a collateral failure.
Does it work on universal AC input?
Yes — the architecture is intended for high-power offline supplies, which on ASIC PSUs is typically 200-277V AC mining-grade input.
Do you stock matching PFC MOSFETs and bridge rectifiers?
Yes — see the related products below for compatible 650V super-junction MOSFETs and 800V bridge rectifiers.
Related products
- 3PCS01 ICE3PCS01G PFC IC for Avalon PSU3300-01 PLUS1
- NCE65TF130D 650V 28A Super-Junction MOSFET
- GBU3008 800V 30A Bridge Rectifier for PSU Repair
- GBJ2508 800V 25A Bridge Rectifier for PSU Repair
Contact contact@lys-sz.com for volume pricing or compatibility questions.
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