CM6807数据手册Champion中文资料规格书

描述 Description

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.

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.

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.

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.

 PWM has a PWMtrifault pin which can sense the PWM short and determine the GMth to turn off PFC

特性 Features

·Both PFC and PWM have the Green Mode to meet blue angel and energy star spec.\r
·10-Pin SOIC package\r
·PWM pulse skipping for the green mode\r
·Use RAC as the Startup resistor which can be > 2000K or higher at IAC pin\r
·It can use the HV bipolar to start up the chip and it helps green mode.\r
·Easy to configure into Boost Follower\r
·Enable lowest BOM for power supply with PFC\r
·Internally synchronized PFC and PWM in one IC\r
·Patented slew rate enhanced voltage error amplifier with advanced input current shaping technique\r
·Universal Line Input Voltage\r
·CCM boost or DCM boost with leading edge modulation PFC using Input Current Shaping Technique\r
·Feedforward IAC pin to do the automatic slope compensation ·PFCOVP, VCCOVP, Precision -1V PFC ILIMIT, PFC Tri-Fault Detect comparator to meet UL1950\r
·Low supply currents; start-up: 100uA typical, operating current: 2mA typical.\r
·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\r
·VINOK Comparator to guarantee to enable PWM when PFC reach steady state \r
·High efficiency trailing-edge current mode PWM\r
·Exact 50% PWM maximum duty cycle\r
·UVLO, REFOK, and brownout protection\r
·Digital PFC and PWM soft start, ~10mS\r
·Precision PWM 1.5V current limit for current mode operation\r
·PWMtrifault to sense DC to DC short and Turn off PFC at GMth\r
·PWMtrifault also can be programmed to do the Thermal Protection\r

应用 Application

·AC Adaptor
·Open Frame