1FEATURES

2• Highly Integrated Converter Operating as a

Buck, or Isolated Forward-Flyback, Flybuck™

• Wide Operating Input Voltage Range from 12 V

to 100 V, 105-V Surge.

• Up to 0.2-A Output Current

• 9-V Always Available VDD Output with up to 2- highmA

Current Capability

• Thermally Enhanced 4-mm x 4-mm SON-8/S-

PVSON-N8 (DRM) Package

• Internally Set Fixed 380-kHz Switching

Frequency

• Internal 2-ms Duration Soft Start

• Voltage Mode Control with Input Feed Forward

Allows Optimal Output Filter Design

• 2% Accuracy Internal 2.5-V Reference

• VDD UVLO

• Cycle-by-Cycle Current Limit with Frequency

Fold Back for Initial Start up Under High

Capacitive Loads

• Input UVLO and OVLO with Input Good Signal

• Integrated 110-V, High and Low-Side Switches

APPLICATIONS

• High Density Isolated Standby Bias Supplies

• DC-to-DC Converters

DESCRIPTION

The UCC25230 is a highly integrated PWM converter

operating as an isolated forward flyback. It has highmA

side and low-side power switches integrated and the control circuit with all key converter functions

included. The power stage requires only one- or

multiple winding coupled inductor and output

capacitors for the complete solution. Voltage-mode

feed-forward control with external compensation

allows optimal output filter selection over wide input

voltage range. The UCC25230 has fixed frequency

set internally at 380 kHz. It also includes input voltage

UVLO and OVLO comparators with hysteresis and

input-good, open-collector output signal which can be

used to enable PWM controllers.

UCC25230 is available in a thermally enhanced 8-pin

SON package with PowerPad™ serving as a ground pin.

Other features include internal soft start and cycle-bycycle

current protection. Measured efficiency of

isolated converter over input voltage and output

current ranges are shown in Figure 2.