CM6900 Datasheet, PDF (2/19 Pages) List of Unclassifed Manufacturers – PFC/PWM COMBO w/ INRUSH CURRENT CONTROL & SEPARATED PFCOVP

CM6900
PFC/PWM COMBO w/ INRUSH CURRENT CONTROL & SEPARATED PFCOVP
GENERAL DESCRIPTION
FEATURES
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.
! 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
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.
2003/04/23 Preliminary Rev. 1.2
Champion Microelectronic Corporation
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