CM6900IP datasheet(2/19 Pages) ETC

2 / 19 page

CM6900

PFC/PWM COMBO w/ INRUSH CURRENT CONTROL & SEPARATED PFCOVP

2003/04/23

Preliminary Rev. 1.2

Champion Microelectronic Corporation

Page 1

GENERAL DESCRIPTION

FEATURES

Patent Filed #5,565,761, #5,747,977, #5,742,151,

#5,804,950, #5,798,635

Inrush Current Control

Separated PFC OVP pin

Separated Power VCCA and Analog VCCA

Separated Power Ground and Analog Ground

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

VCCA 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

The CM6900 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, CM6900 includes

circuits for the implementation of leading edge, average

current, “boost” type power factor correction and a trailing

edge, pulse width modulator (PWM). The CM6900 has

additional features besides all the features of CM6800.

Additional features are Inrush Current Control, Separated

PFC OVP pin, Separated Power VCCA pin and Analog

VCCA pin, and Separated Power Ground pin and Analog

Ground pin. 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.

24 Hours Technical Support---WebSIM

Champion provides customers an online circuit simulation tool

called WebSIM. You could simply logon our website at

CM6900IP Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers

CM6900IP Datasheet(HTML) 2 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Datasheet Download

Link URL