CM6800G

Product Summary

The CM6800 is a low start-up current PFC/PWM 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, the CM6800G 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. The applications of the CM6800G include 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.

Parametrics

CM6800G absolute maximum ratings: (1)VCC: 20 V; (2)IEAO: 0 to 7.5 V; (3)ISENSE Voltage: -5 to 0.7 V; (4)PFC OUT: GND – 0.3 VCC + 0.3 V; (5)PWMOUT: GND – 0.3 VCC + 0.3 V; (6)Voltage on Any Other Pin: GND – 0.3 VCC + 0.3 V; (7)IREF: 10 mA; (8)IAC Input Current: 1 mA; (9)Peak PFC OUT Current, Source or Sink: 1 A; (10)Peak PWM OUT Current, Source or Sink: 1 A; (11)PFC OUT, PWM OUT Energy Per Cycle: 1.5 μ J; (12)Junction Temperature: 150℃; (13)Storage Temperature Range: -65 to 150℃; (14)Operating Temperature Range -40 to 125℃; (15)Lead Temperature (Soldering, 10 sec): 260℃; (16)Thermal Resistance (θJA): ; (17)Plastic DIP: 80℃/W; (18)Plastic SOIC: 105℃/W; (19)Power Dissipation (PD) TA＜5℃: 800mW.

Features

CM6800G features: (1)Patent Number #5,565,761, #5,747,977, #5,742,151, #5,804,950, #5,798,635; (2)Pin to pin compatible with ML4800 and FAN4800; (3)Additional folded-back current limit for PWM section.; (4)23V Bi-CMOS process; (5)VIN OK turn on PWM at 2.5V instead of 1.5V; (6)Internally synchronized leading edge PFC and trailing edge PWM in one IC; (7)Slew rate enhanced transconductance error amplifier for ultra-fast PFC response; (8)Low start-up current (100 ?A typ.); (9)Low operating current (3.0mA type.); (10)Low total harmonic distortion, high PF; (11)Reduces ripple current in the storage capacitor between the PFC and PWM sections; (12)Average current, continuous or discontinuous boost leading edge PFC; (13)VCC OVP Comparator, Low Power Detect Comparator; (14)PWM configurable for current mode or voltage mode operation; (15)Current fed gain modulator for improved noise immunity; (16)Brown-out control, over-voltage protection, UVLO, and soft start, and Reference OK.

Diagrams