1 Features
• 50kHz to 750kHz 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 +0.6/-1.2A gate drive
• Complete protections
– 50ns Over-Current Protection (OCP) - cycle-bycycle
current limit
– Over-Voltage Protection (OVP), internal and
external Over-Temperature Protection (OTP)
– Input and VCCP UVLO with Internal 19V 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.