CM6800 - champion-micro.com

1 CM6800 . LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO. GENERAL DESCRIPTION FEATURES. The CM6800 is a controller for power factor corrected, Patent Number #5,565,761, #5,747,977, #5,742,151, switched mode power suppliers. Power Factor Correction #5,804,950, #5,798,635. (PFC) allows the use of smaller, lower cost bulk Pin to pin compatible with ML4800 and FAN4800. capacitors, reduces power line loading and stress on the Additional folded-back current limit for PWM section. switching FETs, and results in a power supply that fully 23V Bi-CMOS process compiles with IEC-1000-3-2 specifications. Intended as a VIN OK turn on PWM at instead of BiCMOS version of the industry-standard ML4824, Internally synchronized leading edge PFC and trailing CM6800 includes circuits for the implementation of leading edge PWM in one IC.

2 Edge, average current, boost type power factor Slew rate enhanced transconductance error amplifier for correction and a trailing edge, pulse width modulator ultra-fast PFC response (PWM). Gate-driver with 1A capabilities minimizes the Low start-up current (100 A typ.). need for external driver circuits. Low power requirements Low operating current ( type.). improve efficiency and reduce component costs. Low total harmonic distortion, high PF. Reduces ripple current in the storage capacitor between An over-voltage comparator shuts down the PFC section the PFC and PWM sections in the event of a sudden decrease in load. The PFC Average current, continuous or discontinuous boost section also includes peak current limiting and input leading edge PFC.

3 Voltage brownout protection. The PWM section can be VCC OVP Comparator, Low Power Detect Comparator operated in current or voltage mode, at up to 250kHz, and PWM configurable for current mode or voltage mode includes an accurate 50% duty cycle limit to prevent operation transformer saturation. Current fed gain modulator for improved noise immunity Brown-out control, over-voltage protection, UVLO, and CM6800 includes an additional folded-back current limit soft start, and Reference OK. for PWM section to provide short circuit protection function. APPLICATIONS PIN CONFIGURATION. Desktop PC Power Supply SOP-16 (S16) / PDIP-16 (P16). Top View Internet Server Power Supply IPC Power Supply 1 IEAO VEAO 16.

4 UPS 2 V FB 15. I AC. Battery Charger 3 I SENSE V REF 14. DC Motor Power Supply 4 V RMS V CC 13. Monitor Power Supply 5 SS PFC O UT 12. Telecom System Power Supply Distributed Power 6 V DC PW M O UT 11. 7 RAMP1 GND 10. 8 RAMP2 DC I LIMIT 9. 2017/10/17 Rev. Champion Microelectronic Corporation Page 1. CM6800 . LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO. PIN DESCRIPTION. Operating Voltage Pin No. Symbol Description Min. Typ. Max. Unit 1 IEAO PFC transconductance current error amplifier output 0 V. 2 IAC PFC gain control reference input 0 1 mA. 3 ISENSE Current sense input to the PFC current limit comparator -5 V. 4 VRMS Input for PFC RMS line voltage compensation 0 6 V.

5 5 SS Connection point for the PWM soft start capacitor 0 8 V. 6 VDC PWM voltage feedback input 0 8 V. 7 RAMP 1 Oscillator timing node; timing set by RT CT V. (RTCT). When in current mode, this pin functions as the current sense 8 RAMP 2 0 6 V. input; when in voltage mode, it is the PWM input from PFC. (PWM RAMP) output (feed forward ramp). 9 DC ILIMIT PWM current limit comparator input 0 1 V. 10 GND Ground 11 PWM OUT PWM driver output 0 VCC V. 12 PFC OUT PFC driver output 0 VCC V. 13 VCC Positive supply 10 15 18 V. 14 VREF Buffered output for the internal reference V. 15 VFB PFC transconductance voltage error amplifier input 0 3 V. PFC transconductance voltage error amplifier output 16 VEAO 0 6 V.

6 2017/10/17 Rev. Champion Microelectronic Corporation Page 2. CM6800 . LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO. BLOCK DIAGRAM ( CM6800 ). 16 1 13. VEAO IEAO VCC. PFC OVP. VCC OVP + VREF. - VCC + . 14. + - REFERENCE. LOW POWER - DETECT TRI-FAULT POWER. VFB GMv 15 - - FACTOR.. GMi +. S Q. CORRECTOR. + PFC CMP. +.. +. MPPFC. IAC. R Q VCC. - - 2. -1V +. GAIN PFC OUT. VRMS - S Q. 4 MODULATOR 12. PFC ILIMIT. R Q. ISENSE. 3 MNPFC. RAMP1 GND. 7 OSCILLATOR. CLK. 350. PWM PFCOUT. DUTY. DUTY CYCLE. RAMP2. 8 SW SPST PWMOUT. LIMIT. PWM. - CMP VCC. MPPWM. +. VDC PWM OUT. 6. Vcc S Q. SS CMP 11. 20uA - 350 + VFB - R Q.. - MNPWM. SS. 5 +. +. VIN OK GND. SW SPST SW SPST SW SPST.

7 DC ILIMIT. PULSE. VREF WIDTH. MODULATOR. Q S. VCC UVLO. DC ILIMIT. 9 GND. R. 10. ORDERING INFORMATION. Part Number Temperature Range Package CM6800 GIP -40 to 125 16-Pin PDIP (P16). CM6800 GIS -40 to 125 16-Pin Wide SOP (S16). 2017/10/17 Rev. Champion Microelectronic Corporation Page 3. CM6800 . LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO. ABSOLUTE MAXIMUM RATINGS. Absolute Maximum ratings are those values beyond which the device could be permanently damaged. Parameter Min. Max. Units VCC 20 V. IEAO 0 V. ISENSE Voltage -5 V. PFC OUT GND VCC + V. PWMOUT GND VCC + V. Voltage on Any Other Pin GND VCC + V. IREF 10 mA. IAC Input Current 1 mA. Peak PFC OUT Current, Source or Sink 1 A.

8 Peak PWM OUT Current, Source or Sink 1 A. PFC OUT, PWM OUT Energy Per Cycle J. Junction Temperature 150 . Storage Temperature Range -65 150 . Operating Temperature Range -40 125 . Lead Temperature (Soldering, 10 sec) 260 . Thermal Resistance ( JA). Plastic DIP 80 /W. Plastic SOIC 105 /W. Power Dissipation (PD) TA<50 800 mW. ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply Vcc=+15V, RT. = , CT =1000pF, TA=Operating Temperature Range (Note 1). CM6800 . Symbol Parameter Test Conditions Unit Min. Typ. Max. Voltage Error Amplifier (gmv). Input Voltage Range 0 6 V. VNONINV = VINV, VEAO = Transconductance 50 70 90 mho at room temp Feedback Reference Voltage V.

9 Input Bias Current Note 2 A. Output High Voltage V. Output Low Voltage V. Sink Current VFB = 3V, VEAO = 6V -35 -20 A. Source Current VFB = , VEAO = 30 40 A. Open Loop Gain 50 60 dB. Power Supply Rejection Ratio 11V < VCC < 50 60 dB. Current Error Amplifier (gmi). Input Voltage Range V. VNONINV = VINV, VEAO = Transconductance 50 85 100 mho at room temp Input Offset Voltage -25 25 mV. Output High Voltage V. Output Low Voltage V. 2017/10/17 Rev. Champion Microelectronic Corporation Page 4. CM6800 . LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO. ELECTRICAL CHARACTERISTICS. (Conti.) Unless otherwise stated, these specifications apply Vcc=+15V, RT = , CT =1000pF, TA=Operating Temperature Range (Note 1).

10 CM6800 . Symbol Parameter Test Conditions Unit Min. Typ. Max. Sink Current ISENSE = + , IEAO = -65 -35 A. Source Current ISENSE = , IEAO = 35 75 A. Open Loop Gain 60 70 dB. Power Supply Rejection Ratio 11V < VCC < 60 75 dB. PFC OVP Comparator Threshold Voltage V. Hysteresis 230 290 mV. Low Power Detect Comparator Threshold Voltage V. VCC OVP Comparator Threshold Voltage V. Hysteresis V. Tri-Fault Detect Fault Detect HIGH V. Time to Fault Detect HIGH VFB=VFAULT DETECT LOW to 2 4 ms VFB= from VFB to GND. Fault Detect LOW V. PFC ILIMIT Comparator Threshold Voltage V. (PFC ILIMIT VTH Gain Modulator 20 100 mV. Output). Delay to Output (Note 4) Overdrive Voltage = -100mV 250 ns DC ILIMIT Comparator Threshold Voltage V.