TNY288DG Off-Line Switching Power Management Chip

TNY288DG Off-Line Switcher IC for ASIC Miner PSU Standby and Auxiliary Supply

The TNY288DG is a high-efficiency off-line switching power management IC that integrates a high-voltage MOSFET and a controller into a compact SOP7 package. With line-compensation overload protection and EcoSmart energy-efficient operation, it is well suited to the low-power flyback converters that generate the standby and auxiliary rails inside ASIC miner power supplies, PC-style standby modules, set-top boxes and chargers.

Specifications

Where the TNY288DG fits in an ASIC PSU

In ASIC mining PSUs, the auxiliary supply that feeds the main PFC controller, the gate driver and the cooling fans is typically built around a low-power flyback converter. The TNY288DG is the kind of integrated switcher used in that role: it pulls power directly from the high-voltage bulk capacitor and generates a regulated low-voltage rail used to bring the rest of the PSU to life.

If the standby light on the miner never comes on or the main PSU never starts despite a healthy primary bridge and PFC stage, the TNY288DG and its surrounding flyback transformer are common suspects.

Compatibility

Use the TNY288DG wherever the original board calls for a TNY288D or pin-compatible SOP7 off-line switcher. Confirm pinout and footprint against the original part marking before fitting; substitutions across the TNY28x family are common but always need a schematic check.

Common failure symptoms

• PSU dead with no standby voltage on the auxiliary rail
• Standby LED on the control board does not light up
• PFC controller never starts despite a healthy DC bus on the bulk capacitor
• Burn mark visible on the SOP7 IC near the auxiliary flyback transformer
• Repetitive hiccup mode at start-up with no main rail coming up

Frequently asked questions

Can the TNY288DG be substituted across the TNY28x family?

Cross-references inside the TNY28x family share pinout but differ in maximum power and current sense. Always confirm the target part against the original board markings and the schematic before substituting.

How do I tell if the auxiliary supply is what failed?

Probe the auxiliary output rail (typically +12V to +15V near the PFC controller). A missing or low rail with the bulk capacitor still charged points to the auxiliary flyback — TNY288DG, its bias diode and the flyback transformer.

Does this IC need an external high-voltage MOSFET?

No. The switching MOSFET is integrated inside the SOP7 package, which simplifies the flyback design and reduces the board area needed for the standby supply.

Do you supply it in tape and reel for SMT lines?

Yes, contact us for tape-and-reel quantities and lead times for production repair work.

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