PM8804TR STMicroelectronics

PM8804 PWM peak current mode controller for PoE and telecom systems Datasheet - production data High efficiency topologies: Flyback, forward Flyback with synchronous rectification Flyback with active clamp Forward with active clamp VFQFPN 3.0x3.0x1.0 16L 0.5 mm pitch Applications PoE powered devices such as IP phones, Features WLAN access points and network cameras PWM peak current mode controller Telecom power supplies Input operating voltage up to 75 V Table 1. Device summary Internal high-voltage start up regulator with 20 mA current capability Part number Package Packing Current sense with programmable blanking VFQFPN 3.0x3.0x1.0 time up to 200 ns PM8804TR Tape and reel 16L 0.5 mm pitch Programmable fixed frequency up to 1 MHz Soft-start up with settable time Soft turn off (optionally disabled) Dual low-side complementary gate drivers Programmable dead time from 10 to 200 ns between GATE1 and GATE2 Gate drivers have 1 A peak capability GATE2 optionally turned off for reduced consumption 80% maximum duty cycle with internal slope compensation Internal pull-up resistor on CTL pin enables the optocoupler connection Operating current consumption < 1.5 mA Embedded protections: Severe overcurrent protection with latch after 4 events Delayed overload protection with automatic restart Feedback disconnection (OV) protection on VC Thermal shutdown September 2019 DS12490 Rev 2 1/27 This is information on a product in full production. www.st.comTable of contents PM8804 Table of contents 1 Description . 3 2 Typical application circuit and block diagram 4 2.1 Application circuit 4 2.2 PM8804 block diagram 5 3 Pins description and configuration . 6 4 Electrical specifications 8 4.1 Absolute maximum ratings . 8 4.2 Thermal data . 8 4.3 Electrical characteristic 9 5 Applications information 12 5.1 High-voltage start-up regulator and VC pin . 12 5.2 Oscillator and FSW pin . 13 5.3 Delay time and blanking time: DT and BLK pins . 14 5.4 Soft-start / soft-stop and SS pin 15 5.5 PWM comparator / slope compensation and CTL pin . 16 5.6 Current limit and CS pin 16 5.7 Output drivers: GAT1 / GAT2 and MODE pin 17 5.8 Thermal protection 20 6 Layout guidelines 21 6.1 General guidelines for 48 V converter . 21 6.2 How to layout the PM8804 ground pins 22 6.3 Thermal aspects 22 6.4 Component placement . 23 7 Package information 24 7.1 VFQFPN 3.0x3.0x1.0 16L 0.5 mm pitch package information . 24 8 Revision history . 26 2/27 DS12490 Rev 2