CM6800A Champion Microelectronic Corp., CM6800A Datasheet
CM6800A
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CM6800A Summary of contents
Page 1
... GENERAL DESCRIPTION The CM6800A 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 ...
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... Buffered output for the internal 7.5V reference REF 15 V PFC transconductance voltage error amplifier input FB PFC transconductance voltage error amplifier output 16 VEAO 2006/10/11 Rev. 1 TART- P URRENT Description Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER Operating Voltage Min. Typ. Max 1.2 3.9 ...
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... BLOCK DIAGRAM (CM6800A) 16 VEAO - 0.3V + LOW POWER VFB gmv DETECT 15 - COMPARATOR 3.5K . 2.5V + IAC 2 GAIN VRMS MODULATOR 4 ISENSE 3 RAMP1 7 350 RAMP2 8 SW SPST - 1V + VDC 6 Vcc 20uA 350 SPST SW SPST SW SPST VREF DC ILIMIT 9 GND 10 ORDERING INFORMATION Part Number CM6800AGIP* CM6800AGIS Suffix for Pb Free Product ...
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... Current Error Amplifier ( VEAO = 3.75V NONINV INV at room temp Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER Min. Max 7.5 -5 0.7 VCC + 0.3 VCC + 0.3 VCC + 0 1.5 150 -65 150 -40 125 260 80 105 CM6800A Min. Typ 2.45 2.5 -1.0 -0.05 5.8 6.0 0 -25 4.0 4.25 1.0 C OMBO Units ...
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... I = 150 1.8V RMS at room temp μ 300 3.3V RMS at room temp μ 100 A AC μ 250 1.1V RMS Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER CM6800A Min. Typ. - 2.70 2.77 230 0.2 0.3 17.5 17.9 1.40 1.5 2.65 2. GND 0.4 0.5 -1.10 -1.00 20 100 250 0.95 1.0 250 2 ...
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... L Supply V = 12V room temp CC L 14V CM6800A CM6800A pin – (VEAO – 0.625)] ; VEAO OFFSET AC Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER CM6800A Min. Typ 2.5 360 = 2.5V 6 1mA 7.4 7 0℃~70℃ -40℃~85℃ 0.4 7. ...
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... VRMS (V) Gain Modulator Transfer Characteristic (K) − GAINMOD OFFSET = 0.625) AC 2006/10/11 Rev. 1 TART- P URRENT 3 ) Transconductance Current Error Amplifier (g 4 Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER 100 -500 0 ISENSE Transconductance mi 2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0 ...
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... PFC Section Gain Modulator Figure 1 shows a block diagram of the PFC section of the CM6800A. The gain modulator is the heart of the PFC this circuit block which controls the response of the current loop to line voltage waveform and frequency, rms line voltage, and PFC output voltages. There are three inputs to the gain modulator ...
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... R 1.414)/(2 x 200) = 0.226 ohm. PFC OVP In the CM6800A, PFC OVP comparator serves to protect the power circuit from being subjected to excessive voltages if the load should suddenly change. A resistor divider from the high voltage DC output of the PFC is fed to VFB. When the voltage on VFB exceeds 2 ...
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... The gain vs. input voltage of the CM6800A’s voltage error amplifier, V specially shaped non-linearity such that under steady-state operating conditions the transconductance of the error amplifier local minimum. Rapid perturbation in line or ...
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... PFC switching frequency. Therefore, the boost inductor can be reduced 6 times without disturbing the stability. Therefore, the capacitor of the will be around 283nF. FILTER Figure 3. External Component Connections to V Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER and I S SENSE pin: SENSE ...
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... As in current mode operation, the voltage error amplifier is included in the PWM stage of the CM6800A, as this function is generally performed on the output side of the PWM’s isolation boundary. To facilitate the design of optocoupler feedback circuitry, an offset has been built into the PWM’s RAMP2 input which allows V command a zero percent duty cycle for input voltages below 0 ...
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... CM6800A itself (5mA, max.) plus the current required by the two gate driver outputs. EXAMPLE: With a wanting voltage called, V and the CM6800A driving a total gate charge of 90nC at OK comparator at IN 100kHz (e.g. 1 IRF840 MOSFET and 2 IRF820 MOSFET), the gate driver current required is: ...
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... With such synchronized switching, the ripple voltage of the first stage is reduced. Calculation and evaluation have shown that the 120Hz component of the PFC’s output ripple voltage can be reduced by as much as 30% using this method. Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER Page 14 C OMBO ...
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... C57 RAMP2 ILIMIT C56 R61 ILIMIT 470 C51 R44 C38 R49 L5 R46 PWM_Vout C39 IC17 IC18 R45 ILOAD C17 C18 C19 PWM_Rload 500m R48 VCC CM6800A C OMBO D5 PFC_Vout PFC_Vout IC10 R16A C10 R17A R65A C4 ISO1 VDC R43 C40 U1 CM431 Page 15 ...
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... C57 RAMP2 ILIMIT C56 R61 470 ILIMIT C51 R68 R44 C38 R49 L5 R46 PWM_Vout C39 IC17 IC18 R45 ILOAD C17 C18 C19 PWM_Rload 500m R48 VCC CM6800A C OMBO D5 PFC_Vout PFC_Vout IC10 R16A C10 R17A R65A C4 ISO1 VDC R43 C40 U1 CM431 Page 16 ...
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... PACKAGE DIMENSION PIN 1 ID PIN 1 ID 2006/10/11 Rev. 1 TART- P URRENT 16-PIN PDIP (P16) 16-PIN SOP (S16), 0.300” Wide Body θ Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER θ Page 17 C OMBO ...
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... +886-3-567 9909 http://www.champion-micro.com 2006/10/11 Rev. 1 TART- P URRENT IMPORTANT NOTICE Sales & Marketing 7F-6, No.32, Sec. 1, Chenggong Rd., Nangang District, Taipei City 115, Taiwan, R.O. +886-2-2788 0558 +886-2-2788 2985 Champion Microelectronic Corporation CM6800A PFC/PWM C ONTROLLER Page 18 C OMBO ...