The PM8804 from STMicroelectronics is a PWM peak current-mode power controller which integrates all the circuitry required to create a smart and efficient 48V converter for Power over Ethernet (PoE) and mid-power telecoms applications.
The PM8804 is suitable for use in various high- efficiency power-converter topologies, including flyback forward conversion, flyback with synchronous rectification, flyback with active clamp and forward with active clamp. Internal gate drivers with a peak current capability of 1A may be used in the implementation of high- power converter topologies.
Functions integrated into the PM8804 chip:
- Programmable oscillator to set the switching frequency
- Adjustable slope compensation
- Programmable soft-start
- Dual complementary low-side drivers with programmable dead time
- Soft turn-off
- Programmable current-sense blanking time up to 200ns
An internal high-voltage linear regulator with a 20mA output current means that the device requires few external components to perform its start-up routine.
FTM Development Board
STEVAL-POE00xV1 implement PoE converters which operate at high efficiency over a wide load range. They are based on a PM8805 PoE-PD interface, which complies with the IEEE 802.3bt standard, and DC-DC converters run by a PM8804 controller. STEVAL-POE00xV1 differentiate for topology, flyback or active clamp forward, and output conditions. STEVAL-ISA204V1 implements a 5V/20A active clamp forward converter based on PM8804 controller.