CM6504

Features:

Enable lowest BOM for power supply with PFC
Patented slew rate enhanced voltage error amplifier with
advanced input current shaping technique
Universal Line Input Voltage
No bleed resistor required
CCM boost or DCM boost with leading edge modulation
PFC using Input Current Shaping Technique
Feedforward IAC pin to do the automatic slope
compensation
PFCOVP, TriFault Detect, PFC VCCOVP, Precision -1V
PFC ILIMIT
Low supply currents; start-up: 100uA typical, operating
current: 2mA typical.
Synchronized leading PFC and trailing edge modulation
PWM Clock for the down stream DC to DC stage to reduce
ripple current in the storage capacitor between the PFC and
PWM sections and to reduce switching noise in the system
VINOK Comparator to guarantee to enable PWM Clock
when PFC reach steady state
UVLO, VREFOK, and brownout protection


Application

Desktop PC Power Supply
AC Adaptor
Internet Server Power Supply
IPC Power Supply
UPS
Battery Charger
DC Motor Power Supply
Monitor Power Supply
Telecom System Power Supply
Distributed Power


Specifications

PIN DESCRIPTION

Pin No.	Symbol	Description	Operating Voltage
			Min.	Typ.	Max.	Unit
1	PFC OUT	PFC driver output	0		VCC	V
2	GND	Ground
3	ISENSE	Current sense input to the PFC current limit comparator	-5		0.7	V
4	VEAO	PFC transconductance voltage error amplifier output	0		6	V
5	VFB	PFC transconductance voltage error amplifier input	0	2.5	3	V
6	IAC	Feedforward input to do slope compensation and to start up the system	0		1	V
7	VCC	Positive supply	10	15	23	V
8	PWM CLK					V

Description

The 8 pin single PFC controller with 50% PWM clock ,
CM6503/4 is a space-saving controller for power factor
corrected, switched mode power supplies that offers very
low start-up and operating currents. For the power supply
less than 500Watt, its performance could be very close to
CM6800 or ML4800 architecture. Its IAC has dual function.
8 pin CM6503/4 does not require and bleed resistors. It use
IAC pin during the start up condition to start up CM6503/4.
After CM6503/4 is on, IAC will switch itself back to the IAC
function.