1 Features

? 50-kHz to 750-kHz full-load switching frequency

? IPPC control enables wide input & output LLC

(WLLC) operation

? Enhanced light load management:

– High frequency pulse skip for improved light

load efficiency

– Low Frequency Burst for low standby power

– Audible frequency range skip for reduced

audible noise

– Integrated PFC on/off control signal to help

further reduce standby power

? Internal resonant-capacitor voltage synthesizer

for enhanced signal reliability and high startup

frequency support

? Automatic capacitive region avoidance

? Adaptive softs start with minimized inrush current

? Integrated high-voltage startup (UCC256601,

UCC256602, and UCC256604)

? X-capacitor discharge (UCC256601 and

UCC256604).

? Integrated +1.2/-0.6-A gate drive

? Complete protections

– 50-ns Over-Current Protection (OCP) - cycleby-

cycle current limit

– Over-Voltage Protection (OVP), internal &

external Over-Temperature Protection (OTP)

– Input and VCCP UVLO with Internal 19.5-V

VCCP Clamp

? SOIC-14 package with removed pins for highvoltage

clearance

2 Applications

? SMPS power supply for TV

? Industrial AC and DC

? Lighting and battery chargers

? Notebook and gaming console adapter

? Medical power supply

? PC power supply

3 Description

The UCC25660 is a high-frequency LLC controller

implementing Input-Power Proportional Control

(IPPC) scheme, along with an enhanced light-load

management and multiple protection features.

IPPC widens the control range of the LLC converter

simplifies the design of wide input and output-voltage

range applications such as LED drivers, battery

chargers. It can even work without a PFC for nonuniversal

input applications.

The UCC25660’s enhanced light-load management

improves while minimizing audible noise. To minimize

standby power, the UCC25660 can directly disable

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 ensures that the device

can never work in a mode where there is a potential to

damage the FET’s. This scheme makes the controller

ideal for working with a pre-biased load.

The UCC25660 comes with robust protection to help

you design a reliable power supply. The UCC25660

has options supporting high-voltage startup, Xcapacitor

(X-cap) discharge, OVP response, and

extended power range. See details in the device

comparison table.