VIPER26L Intelligent Converter for Whatsminer Power Supply Repair

VIPER26L Intelligent High-Voltage Converter | 800V Integrated MOSFET + PWM Replacement for Whatsminer Power Supply Repair

The VIPER26L is an intelligent off-line converter IC with an integrated 800V avalanche-rugged power MOSFET and current-mode PWM controller on the same die. Used on Whatsminer power supply auxiliary / housekeeping rails — the rail that wakes the controller IC and powers the gate drivers before the main PFC stage comes up. When this rail dies, the entire PSU stays dark.

Headline efficiency specs: under 30mW input power at no load (230VAC) and under 400mW at 230VAC with a 250mW load thanks to burst-mode operation. Embedded high-voltage start-up and sensing FETs simplify the BOM around the IC, and built-in soft-start, hysteretic thermal shutdown, overload / short-circuit protection, and feedback-loop disconnect protection make this a forgiving part for repair work where the original failure may have left adjacent components compromised.

When to Replace the VIPER26L

• Whatsminer PSU completely dead — no auxiliary rail, controller never boots, primary side stays off.
• PSU clicks on then immediately shuts down — converter entering protection on every cycle (OLP / thermal).
• Visible damage on the IC package — cracked or blackened after a primary-side fault event.
• Auxiliary winding rail out of regulation — IC degraded, drifting outside the burst-mode envelope.
• Mains fuse blown after a sudden failure — VIPER26L likely shorted through, took the fuse on power-up.

VIPER26L Specifications

FAQ — VIPER26L

Q: DIP-7 or SOP-16 — which one do I need?
A: Match the original PCB footprint. The two packages contain the same die but route the pins differently — they are not interchangeable in-circuit. Confirm the existing chip's package before ordering.

Q: Whatsminer PSU dead — replace just the VIPER26L?
A: Always inspect the surrounding components first. The VIPER26L sits on the auxiliary winding; if it failed shorted through, the primary side likely saw the spike too. Check the input bridge rectifier, the bulk capacitor, the auxiliary winding transformer, and the surrounding electrolytic caps before replacing only the IC.

Q: How do I test it out-of-circuit?
A: The integrated MOSFET makes simple diode-test inadequate. Use a curve tracer or build a minimal test jig with a known-good output rectifier and feedback loop. For most repair benches, the practical test is in-circuit replacement and observation.

Q: Bulk pricing for Whatsminer PSU repair benches?
A: Yes — email contact@lys-sz.com for tube-quantity VIPER26L pricing in either DIP-7 or SOP-16.

Related products

• NCP1399AM Current-Mode Controller (Avalon PSU)
• OB2268CP PWM Controller (Whatsminer P222B PSU)
• TEA2095T Synchronous Rectifier Controller (Antminer APW11)
• ICE2QR4765 650V QR PWM Controller (Bitmain APW8 / 9 / 12)

Whatsminer PSU repair benches stocking VIPER26L converters by the tube? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.