CM6824 Datasheet, PDF (1/18 Pages) List of Unclassifed Manufacturers – LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO

CM6824
LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO
GENERAL DESCRIPTION
FEATURES
The CM6824 is a controller for power factor corrected,
!
switched mode power suppliers. Power Factor Correction
(PFC) allows the use of smaller, lower cost bulk capacitors, !
reduces power line loading and stress on the switching
!
FETs, and results in a power supply that fully compiles with !
IEC-1000-3-2 specifications. Intended as a BiCMOS
!
version of the industry-standard ML4824, CM6824 includes !
circuits for the implementation of leading edge, average
current, “boost” type power factor correction and a trailing !
edge, pulse width modulator (PWM). Gate-driver with 1A
capabilities minimizes the need for external driver circuits. !
Low power requirements improve efficiency and reduce
!
component costs.
!
!
An over-voltage comparator shuts down the PFC section in
the event of a sudden decrease in load. The PFC section !
also includes peak current limiting and input voltage
brownout protection. The PWM section can be operated in !
current or voltage mode, at up to 250kHz, and includes an !
accurate 50% duty cycle limit to prevent transformer
saturation.
!
!
Patent Filed #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
Pin to pin compatible with ML4800 and FAN6800/1
Additional folded-back current limit for PWM section.
23V Bi-CMOS process
VIN OK guaranteed turn on PWM at 2.5V instead of 1.5V
Internally synchronized leading edge PFC and trailing edge
PWM in one IC
Slew rate enhanced transconductance error amplifier for
ultra-fast PFC response
Low start-up current (100µA typ.)
Low operating current (3.0mA type.)
Low total harmonic distortion, high PF
Reduces ripple current in the storage capacitor between the
PFC and PWM sections
Average current, continuous or discontinuous boost leading
edge PFC
VCC OVP Comparator, Low Power Detect Comparator
PWM configurable for current mode or voltage mode
operation
Current fed gain modulator for improved noise immunity
Brown-out control, over-voltage protection, UVLO, and soft
start, and Reference OK
24 Hours Technical Support---WebSIM
Champion provides customers an online circuit simulation tool
called WebSIM. You could simply logon our website at
www.champion-micro.com for details.
APPLICATIONS
! Desktop PC Power Supply
! Internet Server Power Supply
! IPC Power Supply
! UPS
! Battery Charger
! DC Motor Power Supply
! Monitor Power Supply
! Telecom System Power Supply
! Distributed Power
PIN CONFIGURATION
SOP-16 (S16) / PDIP-16 (P16)
Top View
1
IEAO
VEAO
16
2
IAC
VFB
15
3
ISENSE
VREF
14
4
VRMS
VCC
13
5
SS
PFC OUT
12
6
VDC
PWM OUT
11
7
RAMP1
GND
10
8
RAMP2
DC ILIMIT
9
2002/09/20 Preliminary Rev. 1.1
Champion Microelectronic Corporation
Page 1