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Texas Instruments UCC28780D — Analog & Data Acquisition

UCC28780D Flyback Controller, Up to 1 MHz, 16-SOIC

MPNUCC28780D
End of Life

Texas Instruments UCC28780D, offline flyback controller, topology Flyback, switching frequency up to 1 MHz, isolated output, no internal switch, fault protection OCP/OTP/OVP/SCP, supply 12V~34V, start-up 17.5 V, -40°C~125°C, 16-SOIC, Tray.

$2.18Ref. price · indicative, final on quote
Texas Instruments UCC28780D datasheet (PDF)
Packaging16-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

UCC28780D specifications
ParameterValue
MountingSurface Mount
Voltage - start up17.5 V
Voltage - supply (Vcc (Vdd))12V ~ 34V
Frequency - switchingUp to 1MHz
Operating temperature-40°C ~ 125°C (TJ)
PackageTray
TopologyFlyback
Case16-SOIC (0.154\", 3.90mm Width)
Fault protectionOver Current, Over Temperature, Over Voltage, Short Circuit
Output isolationIsolated
Internal switchNo

Product details

1 MHz flyback controller — no internal FET, so plan the external switch

The Texas Instruments UCC28780D is an offline flyback controller in a 16-SOIC package. It runs a flyback topology with isolated output, switching up to 1 MHz. That frequency lets you shrink the transformer, but the controller has no built-in MOSFET — you pick the external switch, which means the BOM includes a FET plus its gate-drive loop. The supply range is 12 V to 34 V on Vcc, with a 17.5 V start-up threshold.

Protection set and temperature range

Fault protection covers over-current, over-temperature, over-voltage, and short-circuit. That is a solid safety net for an offline supply where a crowbar or latch-off is expected.

Frequently asked questions

Does UCC28780D have a built-in MOSFET or require an external switch?

The UCC28780D has no internal switch. You must add an external MOSFET. The controller provides the gate drive, so the FET selection is part of the BOM — choose one rated for your output power and transformer reset voltage.

What is the maximum switching frequency of UCC28780D?

The UCC28780D switches up to 1 MHz. That is a high ceiling for a flyback controller, enabling a small transformer and reduced output capacitance, but it also pushes the EMI filter design and gate-drive layout.