1 Features

• Full-load switching frequency: 50kHz to 750kHz

• IPPC control enables wide input and 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 (UCC256614-Q1)

• Internal resonant-capacitor voltage synthesizer

for enhanced signal reliability and high start-up

frequency support

• Zero current switching (ZCS) avoidance to

eliminate capacitive region operation

• Adaptive soft start with minimized inrush current

• Integrated high-voltage start-up (UCC256612-Q1

and UCC256614-Q1)

• Integrated gate driver: +0.6A and –1.2A

• Complete protections

– Overcurrent protection (OCP): 50ns, cycle-bycycle

current limit

– Overvoltage protection (OVP), internal and

external overtemperature protection (OTP)

– Input and VCCP UVLO with internal 19V VCCP

Clamp

– Independently configured OCP and

overload protection (OLP) (UCC256612-Q1,

UCC256613-Q1, and UCC256614-Q1)

• SOIC-14 package with removed pins for highvoltage

clearance

2 Applications

• Cell monitor unit and battery junction box

• HEV/EV OBC and DC/DC converter

• EV charging infrastructure

• HEV/EV inverter and motor control

• Zone and body domain controller

3 Description

The UCC25661x-Q1 family is a high-frequency LLC

controller that implements a input-power proportional

control (IPPC) scheme, along with enhanced lightload

management and multiple protection features.

IPPC widens the control range of the LLC converter

and simplifies the design of wide input applications,

such as high voltage to low voltage (HV-LV)

redundant auxiliary, key-off, and bias isolated power

supplies. IPPC simplifies the design of wide output

applications, such as light electric vehicle battery

chargers (scooters, mopeds, golf carts, and fork lifts).

The UCC25661x-Q1 family has enhanced light-load

management that improves efficiency and minimizes

audible noise. To minimize standby power in charger

applications, the UCC25661x-Q1 family directly

disables the PFC controller when operating in burst

mode.

The automatic capacitive region avoidance scheme,

along with the adaptive soft start with a reverse

recovery avoidance scheme, establishes that the

device never works in a mode where there is

a potential to damage the FETs. Because of the

automatic capacitive region avoidance scheme, the

controller works best with a prebiased load.

The UCC25661x-Q1 family comes with robust

protection for designing a reliable power supply. The

UCC25661x-Q1 family has options supporting various

features, see details in the Device Comparison table.