STEVAL-ISA203V1 evaluation board is designed to demonstrate high efficiency DCDC conversion with 60 W output (12 V/5 A) from 42 to 56 VDC input (48 V nom.), which is especially suitable for telecom applications.
The power conversion stage is based on a flyback topology managed by the PM8804 controller, which features all the integrated circuitry necessary for a compact and efficient 48 V converter. The highly configurable controller includes a programmable oscillator for switching frequency regulation up to 1 Mhz, adjustable slope compensation, dual complementary low-side drivers with programmable dead time, programmable soft start, soft turn off and a programmable current sense blanking time.
The secondary side employs the SRK1000 adaptive synchronous rectification controller for flyback converters.

• DC-DC flyback converter based on:
– PM8804 PWM peak current mode controller, and
– SRK1000 adaptive synchronous rectification controller
• Input voltage range 42 – 56 VDC
• Switching frequency: 200 kHz
• Output:
– Power: 60 W
– Voltage: 12 VDC
– Current: 5 A
• Peak efficiency > 92%
• RoHS compliant

https://www.st.com/resource/en/data_brief/steval-isa203v1.pdf