CM6901XIS

CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs GENERAL DESCRIPTION CM6901 is a SLS, SRC/LLC + SR resonant controller and it can operate at both SRC and LLC region with synchronous rectification to achieve high efficiency. Its unique features: FM + 2 PWMING modes. It is used for DC-DC conversion in offline application. Light load regulation is accomplished by transitioning the controller from frequency modulation mode into PWM mode. To have the optimal balance performance between hold-up time and efficiency, its frequency range crosses fr1(resonant frequency). CM6901 system has a constant voltage feedback loop with precision 2.5V VFB reference. The 1V ILIMIT can be latched when a standby converter is applied; otherwise, it is an auto-restart I limit. FEATURES 90+ Controller Smaller and Thinner Transformer 20ms with reasonable Bulk Cap(hold up time) SLS, SRC/LLC + SR resonant controller Supply Voltage Range : 10V to 20V. 2 Gate Drivers: Typical Peak Drive from 12V supply : (PMOS~200 ohm and NMOS~100 ohm). UVLO =11V with 1V Hystetesis. Reference OK Comparator. FM + 2 PWMING Mode Operation Light Load PWMING (light load regulation) SR Ideal Diode PWMING(cross resonant frequency application ) GM FEAO, FM modulation Error Amplifier GM DEAO, PWM Error Amplifier Close Loop Soft start Capability with Shutdown Function. Auto-Restart during Current Limit . Precision 2.5V VFB threshold for constant voltage feedback loop. Precision 1V I limit threshold. APPLICATIONS DC-DC power supply. Operates in FM/PWM mode. CM6901 Pin Configuration 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 1 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs ORDERING INFORMATION Part Number CM6901GIS* CM6901GISTR* CM6901GIP* CM6901XIS* CM6901XISTR* CM6901XIP* Temperature Range -40℃ to 125℃ -40℃ to 125℃ -40℃ to 125℃ -40℃ to 125℃ -40℃ to 125℃ -40℃ to 125℃ Package 16-Pin SOP (S16) 16-Pin SOP (S16) 16-Pin PDIP (P16) 16-Pin SOP (S16) 16-Pin SOP (S16) 16-Pin PDIP (P16) *Note : G : Suffix for Pb Free Product X : Suffix for Halogen Free and PB Free Product TR : Package is Typing Reel BLOCK DIAGRAM 3 FEAO CM6901 VCC 15 UVLO/REF . - 2 V FB + V Tol 2.5V RSET VREF 16 - 1 + 1.5V - GND 10 . 4 5 D IN. + D IN+ 1.25V 6 DEAO - PRIDRV 14 VCC 10uA + . PRIDRVB 13 Logic + SRDRV 12 SRDRVB 11 7 CSS SHDN 1V RTCT - . ILIM + 8 9 CLK OSC . ILim - 1V 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 2 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs PIN DESCRIPTION Operating Voltage Min. External resistor which convert FEAO voltage signal into current 1 0 Pin No. Symbol Description Typ. Max. 5.5 Unit V RSET signal for frequency modulation. SR is PWMing Control , when RSET lower than 1.5V. 2 VFB FEAO Non-inverting input into resonant error amplifier . Resonant error amplifier output and compensation node for frequency modulation control. 0 2.5 3 V 3 0 5.5 V 4 D_IND_IN+ Inverting input into PWM error amplifier. 0 6 V 5 Non-inverting input into PWM error amplifier. PWM error amplifier output and compensation node for PWM control. 0 6 V 6 DEAO 0 4.5 V 7 CSS ILIM RTCT GND SDRVB SDRV PRIDRVB PRIDRV VCC VREF Soft start for FM/PWM operation with 1V enable threshold. Also, use for auto-restart operation during current limit. Input to current comparator with 1V threshold. Oscillator timing components which set the minimum frequency. Ground Synchronous MOSFET driver output. Synchronous MOSFET driver output. Primary side MOSFET driver output. Primary side MOSFET driver output. Positive supply for the IC Buffered output for the 7.5V voltage reference 0 5.5 V 8 9 10 11 12 13 14 15 16 0 1.2 1 1.25 3 V V -0.3 -0.3 -0.3 -0.3 10 15 7.5 VCC VCC VCC VCC 20 V V V V V V 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 3 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs ABSOULTE MAXIMUM RATINGS (TA=25℃, unless otherwise specified.) The following ratings designate persistent limits beyond which damage to the device may occur. Symbol VCC SRDRV SRDRVB PRIDRV PRIDRVB VREF RTCT VILIM CSS DEAO D_IN+ FEAO VFB RSET DC Supply Voltage SRDRV Voltage SRDRVB Voltage PRIDRV Voltage PRIDRVB Voltage VREF Voltage RTCT Voltage VILIM Voltage CSS Voltage Parameter Value Unit V V V V V V V V V V V V V V -0.3 to 20 -0.3 to VCC+0.3 -0.3 to VCC+0.3 -0.3 to VCC+0.3 -0.3 to VCC+0.3 -0.3 to 7.5 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 -0.3 to VREF+0.3 PWM Error Amplifier Output Voltage Non-Inverting Input Into PWM Error Amplifier Voltage Resonant Error Amplifier Output Voltage Non-Inverting Input Into Resonant Error Amplifier Voltage V to I Voltage 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 4 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs ELECTRICAL CHARACTERISTICS (VCC=12V, RT=43K±1%, CT=820pF±1%, Freq. = 80 KHz, Duty Cycle=48% , Temp= -40 ~ 125 ℃, unless otherwise specified.) Parameter VREF (pin 16) VREF Reference Voltage ( note1) VREF VREF Line Regulation Load Regulation VCC (pin 15) VCC Start up voltage VCC Turn off voltage VCC Start up current UVLO Hysteresics Operating Current Hys ICC Vstart 10.5 9.5 63.5 0.95 11 10 74.5 1 1 11.5 10.5 85.5 1.05 V V uA V mA TA=25℃; Iref=1mA TA=-40℃; Iref=0mA TA=125℃; Iref=0mA 11.5V < Vcc < 16.5V 0mA < Iref < 5mA 0 7.41 7.44 7.53 7.5 7.53 7.67 10 10 7.59 7.62 7.7 25 25 V V V mV mV Symbol Conditions Min. Typ. Max. Unit SRDRVB , SRDRV , PRIDRVB , PRIDRV (pin 11,12,13,14) Output Low Voltage Output High Voltage Iout peak source current Iout peak sink current PMOS Rdson NMOS Rdson Dead Time between PRIDRV and PRIDRVB Rising Edge Delay Between PRIDRV and SRDRV Falling Edge Delay Between SRDRV and PRIDRV Duty Cycle Range ILIM (pin 8) Threshold Voltage SS Voltage Hi SS Voltage Low Vth TA=25℃ TA=25℃ TA=25℃ 1.45 0.95 1.31 1.65 1 1.64 1.75 1.05 1.97 V V V Vol Voh Iout Iout Rout Rout TDead TDelay TDelay TA=25℃ TA=25℃ TA=25℃ TA=25℃ TA=25℃ 175 178 0 Isrdrv=-6mA Isrdrv=+6mA 9.6 0.6 10.8 0.12 0.12 200 100 650 217.5 222.5 260 267 50 250 150 1.2 V V A A Ohm Ohm ns ns ns % 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 5 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs ELECTRICAL CHARACTERISTICS (VCC=12V, RT=43K±1%, CT=820pF±1%, Freq. = 80 KHz, Duty Cycle=48% , Temp=-40 ~ 125℃, unless otherwise specified.) Parameter CSS (pin 7) Soft Start Current Enable Voltage Enable Hysteresis Auto-restart Upper Threshold Auto-restart Lower Threshold Iss Ven Vhys Vup Vlw TA=25℃ TA=25℃ TA=25℃ 4.85 -8.7 0.9 -7.5 1.0 100 5.0 1-Vhyst 5.15 -6.3 1.1 uA V mV V V Symbol Conditions Min. Typ. Max. Unit FEAO Resonant Error Amplifier (pin 3) Input Voltage Range Transconductance VFB (Pin2) TA=25℃ Feedback Reference Voltage (note 2) TA=125℃ TA=-40℃ Input Bias Current Output High Voltage Output Low Voltage Sink Current Source Current Open Loop Gain DEAO PWM Error Amplifier (pin 6) Input Voltage Range Reference Voltage Transconductance Input Bias Current Output Voltage High Output Voltage Low Sink Current Source Current Open Loop Gain Gm TA=25℃ 0.96 95 -1.0 1.01 120 -0.5 3+VBE 0.1 -5 7 60 0.4 6 1.06 145 V V umho uA V V uA uA dB VFB =250mV , TA=25℃ VFB = -250mV , TA=25℃ -20.4 12.4 2.475 2.485 2.465 -1 2.5 2.51 2.49 -0.5 5.5+VBE 0.1 -17 15.6 60 0.4 -13.6 18.8 2.525 2.535 2.515 V V V uA V V uA uA dB Gm VFB±50mV, TA=25℃ 37 46.5 6 56 V umho 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 6 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs ELECTRICAL CHARACTERISTICS (VCC=12V, RT=43K±1%, CT=820pF±1%, Freq. = 80 KHz, Duty Cycle=48% , Temp=-40 ~ 125 ℃, unless otherwise specified.) Parameter Symbol Conditions Min. Typ. Max. Unit RTCT Oscillator;RT=43K±1%;CT=820pF±1%, (pin 9) Initial Accuracy Voltage Stability Temperature Stability Ramp Valley to Peak Voltage CT Discharge Time Maximum Duty cycle Minimum Duty Cycle SR Ideal Diode (pin12) Maximum Duty cycle Middle Duty cycle Minimum Duty cycle Frequency at Minimum Duty cycle TA=25℃ TA=25℃ TA=25℃ 35 22 2.5 40 24.5 4.65 45 27 6.8 % % % DEAO > 3.0V DEAO < 1.2V TA=25℃ 11.5V < Vcc < 16.5V 72 80 1 2 2 350 48 0 88 Khz % % V nS % % TA=25℃ 36 39 42 KHz 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 7 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs Note1 Temperature V.S. Vref for CM6901 7.68 7.67 7.66 7.65 7.64 7.63 7.62 7.61 7.6 7.59 Vref 7.58 7.57 7.56 7.55 7.54 7.53 7.52 7.51 7.5 7.49 7.48 7.47 -40 -30 -20 -10 0 ℃ ℃℃℃℃ 10 ℃ 20 ℃ 30 ℃ 40 ℃ 50 ℃ 60 ℃ 70 ℃ 80 ℃ 90 ℃ 100 110 125 ℃℃℃ Vref Temp Note2 Temperature V.S. VFB for CM6901 2.555 2.55 2.545 Vfb 2.54 2.535 2.53 2.525 2.52 -40℃ 2009/11/02 Rev1.4 Vfb -30℃ -20℃ -10℃ 0℃ Champion Microelectronic Corporation 10℃ 20℃ 30℃ Temp 40℃ 50℃ 60℃ 70℃ 80℃ 90℃ 100℃ 110℃ 125℃ Page 8 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs Timing Diagram Dead Time PRIDRVB PRIDRV D elay Time Delay Time SRDRVB SRDRV Oscillator The oscillator frequency is determined by the values of RT and CT. fosc = 1 / (tRAMP + t DEADTIME) tRAMP = RT * CT * ln((VREF + ICHG*RT -1.25)/(VREF + ICHG*RT -3)) where ICHG = 4*(FEAO-VBE)/RSET tDEADTIME = 2.5V/2.5mA * CT = 850 * CT Resonant Section FM Modulator Frequency modulation of the resonant controller section is accomplished by controlling the charging current of the oscillator through resonant error amplifier. The frequency of the resonant section is ½ of the oscillator frequency. Compensation is accomplished by connecting R and C in series to the FEAO pin. ICHG = 4*(FEAO-VBE)/RSET ICHG(max) = 20V/RSET 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 9 CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs V re f RT VFB + V To I OSC CT 2 .5 V - RSET 2 PWMings: SR Ideal Diode PWMing (Synchronous Outputs) SR Ideal Diode PWMing for synchronous drivers is accomplished by comparing the voltage signal at the RSET pin to RTCT ramp. The pulse-width reduction happens when the voltage at the RSET is lower than 1.5V. This allows safe operation of the power converter with synchronous rectification when the switching frequency is below the highest resonant point frequency fr1. V out V ref R f1 V FB 3V RT + 1.25V FEA O V To I O SC + To Logic R f3 2.5V 1.5V RSET R f4 CT D ecreasing Pulsew idth w ith V (R S E T)