PM8804 PWM controller Datasheet

PM8804 Datasheet, PDF, Equivalent


Part Number

PM8804

Description

PWM controller

Manufacture

STMicroelectronics

Total Page 27 Pages
Datasheet
Download PM8804 Datasheet


PM8804
PM8804
PWM peak current mode controller for PoE and telecom systems
VFQFPN 3.0x3.0x1.0 16L 0.5 mm pitch
Features
PWM peak current mode controller
Input operating voltage up to 75 V
Internal high-voltage start up regulator with 20
mA current capability
Current sense with programmable blanking
time up to 200 ns
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
Datasheet - production data
High efficiency topologies:
– Flyback, forward
– Flyback with synchronous rectification
– Flyback with active clamp
– Forward with active clamp
Applications
PoE powered devices such as IP phones,
WLAN access points and network cameras
Telecom power supplies
Table 1. Device summary
Part number
Package
Packing
PM8804TR
VFQFPN 3.0x3.0x1.0
16L 0.5 mm pitch
Tape and reel
September 2019
This is information on a product in full production.
DS12490 Rev 2
1/27
www.st.com

PM8804
Table of contents
Table of contents
PM8804
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


Features PM8804 PWM peak current mode controller for PoE and telecom systems VFQFPN 3. 0x3.0x1.0 16L 0.5 mm pitch Features  PWM peak current mode controller  I nput operating voltage up to 75 V  I nternal high-voltage start up regulator with 20 mA current capability  Curr ent sense with programmable blanking ti me up to 200 ns  Programmable fixed frequency up to 1 MHz  Soft-start up with settable time  Soft turn off ( optionally disabled)  Dual low-side complementary gate drivers  Programm able dead time from 10 to 200 ns betwee n GATE1 and GATE2  Gate drivers have 1 A peak capability  GATE2 optional ly turned off for reduced consumption 80% maximum duty cycle with internal slope compensation  Internal pull-u p resistor on CTL pin enables the optoc oupler connection  Operating current consumption < 1.5 mA  Embedded prot ections: – Severe overcurrent protect ion with latch after 4 events – Delay ed overload protection with automatic restart – Feedback disconnection (OV) protection on VC – Th.
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