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UCC25661
  • UCC25661
  • UCC25661

UCC25661

ACTIVE

Wide VIN and VOUT 750KHz LLC controller with high-voltage startup

Texas Instruments UCC25661 Product Info

1 April 2026 2

Parameters

Topology

Half bridge, Half-bridge, LLC, LLC half-bridge

Control mode

Current

Features

Extended power range, High frequency, High-voltage startup, Light load efficiency, Low audible noise, Overcurrent protection, Overtemperature protection, Overvoltage protection, PFC ON/OFF signal, Secondary-side regulated, Soft-start, Wide Input, Wide VIN, Wide VOUT, Wide input voltage, Zero voltage switching

Package

SOIC (DDB)-14-59.4 mm² 9.9 x 6

Features

  • Full-load switching frequency: 50kHz to 750kHz
  • Input Power Proportional Control (IPPC) for wide LLC
  • Enhanced light load management (standby power and audible noise):
    • High frequency and audible frequency pulse skip
    • Low frequency burst (all except UCC256616)
    • Integrated PFC on/off (UCC256614)
    • Soft in and out of burst mode (UCC256610)
  • Internal resonant-capacitor voltage synthesizer for signal reliability and high frequency start-up
  • Zero current switching (ZCS) avoidance to eliminate capacitive region operation
  • Adaptive soft start with minimized inrush current and eliminating reverse recovery at start-up
  • Integrated gate drive: +0.6/-1.2A
  • Integrated high-voltage start-up (UCC25661x family except UCC256613)
  • X-capacitor discharge (UCC256610, UCC256611, and UCC256614)
  • Extended Gain Range (UCC256611 and UCC256614)
  • 50ns overcurrent protection (OCP), cycle-by-cycle current limit
  • Overvoltage protection (OVP), OVP latch (UCC256611 and UCC256616)
  • Internal and external OTP
  • Input and VCCP UVLO with internal 19V VCCP Clamp
  • Independently configured OCP and overload protection (OLP/OPP) (UCC25661x family except UCC256616)
  • SOIC-14 package with removed pins for high-voltage clearance
  • Full-load switching frequency: 50kHz to 750kHz
  • Input Power Proportional Control (IPPC) for wide LLC
  • Enhanced light load management (standby power and audible noise):
    • High frequency and audible frequency pulse skip
    • Low frequency burst (all except UCC256616)
    • Integrated PFC on/off (UCC256614)
    • Soft in and out of burst mode (UCC256610)
  • Internal resonant-capacitor voltage synthesizer for signal reliability and high frequency start-up
  • Zero current switching (ZCS) avoidance to eliminate capacitive region operation
  • Adaptive soft start with minimized inrush current and eliminating reverse recovery at start-up
  • Integrated gate drive: +0.6/-1.2A
  • Integrated high-voltage start-up (UCC25661x family except UCC256613)
  • X-capacitor discharge (UCC256610, UCC256611, and UCC256614)
  • Extended Gain Range (UCC256611 and UCC256614)
  • 50ns overcurrent protection (OCP), cycle-by-cycle current limit
  • Overvoltage protection (OVP), OVP latch (UCC256611 and UCC256616)
  • Internal and external OTP
  • Input and VCCP UVLO with internal 19V VCCP Clamp
  • Independently configured OCP and overload protection (OLP/OPP) (UCC25661x family except UCC256616)
  • SOIC-14 package with removed pins for high-voltage clearance

Description

The UCC25661x family is a high-frequency LLC controller implementing input-power proportional control (IPPC) scheme, along with enhanced light-load management and multiple protection features. IPPC widens the control range of the LLC converter and simplifies the design of wide input or output-voltage range applications such as LED drivers and battery chargers. IPPC works without a PFC for non-universal input applications.

The UCC25661x family has enhanced light-load management that improves the efficiency while minimizing audible noise. To minimize standby power, the UCC25661x family directly disables the PFC controller when operating in burst mode.

The automatic capacitive region avoidance scheme along with the adaptive soft start with reverse recovery avoidance scheme verifies that the device never works in a mode where there is a potential to damage the FETs. The automatic capacitive region avoidance scheme makes the controller appropriate for working with a prebiased load.

The UCC25661x family comes with robust protection to help users design a reliable power supply. The UCC25661x family has options supporting high-voltage start-up, X-capacitor (X-cap) discharge, OVP, and extended gain range (EGR). See details in the Device Comparison table.

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