CM6807
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
GENERAL DESCRIPTION
FEATURES
The CM6807 is the Green-Mode PFC/PWM Combo
controller for High Density AC Adapter. For the power
supply less than 200Watt, it’s input current shaping PFC
performance could be very close to the performance of the
CM6800 or ML4800 leading edge modulation average
current topology.
Patent Filed #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
Both PFC and PWM have the Green Mode to meet blue
angel and energy star spec.
10-Pin SOIC package
PWM pulse skipping for the green mode
Use RAC as the Startup resistor which can be > 2000K or
higher at IAC pin
CM6807 offers the use of smaller, lower cost bulk
capacitors, reduces power line loading and stress on the
switching FETs, and results in a power supply fully
compliant to IEC1000-3-2 specifications. The CM6807
includes circuits for the implementation of a leading edge,
input current shaping technique “boost” type PFC and a
trailing edge, PWM.
It can use the HV bipolar to start up the chip and it helps
green mode.
Easy to configure into Boost Follower
Enable lowest BOM for power supply with PFC
Internally synchronized PFC and PWM in one IC
Patented slew rate enhanced voltage error amplifier with
advanced input current shaping technique
Universal Line Input Voltage
The CM6807’s PFC and PWM operate at the same
frequency, 67.5kHz. A PFC OVP comparator shuts down
the PFC section in the event of a sudden decrease in load.
The PFC section also includes peak current limiting for
enhanced system reliability.
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, VCCOVP, Precision -1V PFC ILIMIT, PFC
Tri-Fault Detect comparator to meet UL1950
Low supply currents; start-up: 100uA typical, operating
current: 2mA typical.
Both PFC and PWM have the Green Mode Functions.
When the load is below GMth, Green Mode Threshold,
PFCOUT is turned off. The GMth can be programmed by
the designer. PWM Green Mode will happen when the
PWMCMP (PWM Comparator) Duty Cycle is less than ~
6%, in the next cycle, the PWMOUT pulse will be removed
until PWMCMP Duty Cycle is greater than 6%, then the
next cycle, PWMOUT pulse appears.
Synchronized leading PFC and trailing edge modulation
PWM 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 when
PFC reach steady state
PWM has a PWMtrifault pin which can sense the PWM
short and determine the GMth to turn off PFC.
High efficiency trailing-edge current mode PWM
Exact 50% PWM maximum duty cycle
UVLO, REFOK, and brownout protection
Digital PFC and PWM soft start, ~10mS
Precision PWM 1.5V current limit for current mode
operation
PWMtrifault to sense DC to DC short and Turn off PFC at
GMth
PWMtrifault also can be programmed to do the Thermal
Protection
2010/04/20 Rev1.0
Champion Microelectronic Corporation
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