CM6800UX Power Factor Correction Switch Mode Power Supply Control

CM6800UX Power Factor Correction Controller | Champion Microelectronic SOP-16 SMPS Control IC

Upgrade your power-supply system with the CM6800UX PFC controller from Champion Microelectronic — the integrated PFC + PWM controller designed to optimise efficiency and reliability across switch-mode PSU designs. The chip delivers active power factor correction (reducing power-line loading and stress on switching FETs) and integrates a complete leading-edge PFC + trailing-edge PWM control architecture in a single SOP-16 device, with the two stages synchronised to minimise ripple current in the bulk capacitor between them.

Featuring a 23V Bi-CMOS process, the CM6800UX delivers excellent performance and reliability across the operating envelope. The chip includes peak current limiting, input voltage brown-out protection, and foldback current limit for short-circuit protection in the PWM section. The PWM section operates in current or voltage mode up to 250kHz, with an accurate 50% duty-cycle limit to prevent transformer saturation in flyback and forward topologies. Pin-compatible with the legacy ML4800 and FAN4800, it slots in as a clean replacement for end-of-life PFC + PWM controllers.

Versatile Control for Switch-Mode Power Supplies with PFC and PWM Integration

• Pin-compatible with ML4800 and FAN4800 — drop-in replacement for legacy PFC + PWM designs.
• Synchronised leading-edge PFC and trailing-edge PWM — reduces ripple current in the storage capacitor between the two stages.
• Ultra-fast PFC response with the slew-rate-enhanced transconductance error amplifier.
• Low startup and operating current for improved efficiency on standby loads.
• Low total harmonic distortion (THD) and high power factor (PF) compliance.
• Configurable PWM operation in current mode or voltage mode for design flexibility.
• Undervoltage control, OVP, UVLO, and soft start for clean power-up sequencing and protection.
• 1A-capable gate driver minimises external driver circuitry for the primary MOSFET.

Where the CM6800UX Fits

The CM6800UX is the standard PFC + PWM controller for offline switch-mode power supplies in the 100W-1500W range — server PSUs, industrial supplies, lighting controllers, and ASIC-class miner PSUs that need PFC compliance with 80 PLUS efficiency targets. Its pin compatibility with the older ML4800 and FAN4800 makes it a clean drop-in for repair scenarios where the original chip is end-of-life or hard to source. Common applications include PSU repair on Bitmain APW-series, Whatsminer P-series, and other ASIC mining power supplies that share the same PFC + flyback / forward architecture.

CM6800UX Technical Features

FAQ — CM6800UX PFC + PWM Controller

Q: Can I drop CM6800UX in to replace an ML4800 or FAN4800?
A: Yes — the CM6800UX is pin-compatible with both ML4800 and FAN4800. In most cases, no PCB rework is needed.

Q: Does it support both buck and boost topologies?
A: The PFC stage is a boost converter; the PWM stage drives a flyback or forward output topology. CM6800UX is not a buck regulator.

Q: What package does the CM6800UX use?
A: SOP-16 surface-mount package — standard footprint for the original ML4800 / FAN4800 family.

Q: What ASIC mining PSUs use this controller?
A: A wide range of legacy and current ASIC PSU designs use this controller family — common targets include older Bitmain APW-series boards and various offline-flyback PSU designs.

Q: Bulk pricing available?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.

Related products

• TPS53647RTAR PMBus Buck Controller IC
• TPS54561DPRR 5A Buck Converter (60V WSON-10)
• TNY284DG Off-Line Switcher IC (725V)
• OB2276CP PWM Control IC (Whatsminer P222B)

Need CM6800UX in tray quantities for SMPS / mining-PSU production? Email contact@lys-sz.com for bulk pricing and lead times. Worldwide shipping from our Shenzhen warehouse.