SA7527 POWER FACTOR CORRECTION CONTROLLER OF CRITICAL DUCTING DESCRIPTION The SA7527 provides simple and high performance active power factor correction. The SA7527 is optimized for electronic ballasts and low power and high-density power supplies which require minimum board size, reduced external components and low power dissipation. DIP-8-300-2.54 Because the R/C filter is included in the current sense block, the external R/C filter is not necessary. Special circuitry has also been added to prevent no load runaway conditions. Regardless of the supply voltage, the output drive clamping circuit limits the overshoot of the power MOSFET gate drive. It greatly enhances the system reliability. SOP-8-225-1.27 FEATURES * Internal start-up timer ORDERING INFORMATION * Internal R/C filter eliminates the need for an external R/C filter * Very precise adjustable output over voltage protection Device Package * Zero current detector SA7527 DIP-8-300-2.54 * One quadrant multiplier SA7527S SOP-8-225-1.27 * Trimmed 1.5% internal band gap reference * Under voltage lockout with 3V of hysteresis APPLICATIONS * Totem pole output with high state clamp * Low start-up and operating current * 8-pin DIP or 8-pin SOP * Electronic ballast * SMPS BLOCK DIAGRAM HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2005.07.22 Page 1 of 8 SA7527 ABSOLUTE MAXIMUM RATINGS (Tamb=25°C) Characteristics Symbol Rating Unit VCC 30 V IOH, IOL ±500 mA Iclamp ±10 mA Idet ±10 mA Vin -0.3 to 6 V Tj 150 °C Operating Temperature Range Topr -25 to 125 °C Storage Temperature Range Tstg -65 to 150 °C Power Dissipation Pd 0.8 W Supply Voltage Peak Drive Output Current Driver Output Clamping Diodes VO>VCC or VO<-0.3V Detector Clamping Diodes Error Amp, Multiplier And Comparator Input Voltage Operating Junction Temperature TEMPERATURE CHARACTERISTICS Characteristics Symbol Min. Typ. Max. Unit Temperature Stability For Reference Voltage (Vref) ∆Vref -- 20 -- mV Temperature Stability For Multiplier Gain (K) ∆K/∆T -- -0.2 -- %/°C ELECTRICAL CHARACTERISTICS (Unless otherwise stated, VCC=14V, -25°C ≤Tamb≤125°C) Characteristics Symbol Test condition Min. Typ. Max. Unit 10.5 11.5 12.5 V Under Voltage Lockout Section Start Threshold Voltage Vth (st) VCC increasing UVLO Hysteresis HY (st) -- 2 3 4 V Supply Current Section Start-Up Supply Current Ist VCC=Vth(st)-0.2 10 60 100 µA Operating Supply Current ICC Output not switching -- 3 6 mA Vinv=3V -- 1.7 4 mA 50kHz, CI=1nF -- 4 8 mA Iref=0mA, Tamb=25°C 2.465 2.5 2.535 V -25≤Tamb≤125°C 2.44 2.5 2.56 V Operating Current OVP Dynamic Operating Supply Current ICC(OVP) IDCC Error Amplifier Section Voltage Feedback Input Threshold Vref Line Regulation ∆Vref1 14V≤VCC≤25V -- 0.1 10 mV Temperature Stability Of Vref (note) ∆Vref3 -25≤Tamb≤125°C -- 20 -- mV Input Bias Current Ib(ea) -- -0.5 -- 0.5 µA Output Source Current Isource Vm2=4V -2 -4 -- mA Isink Vm2=4V 2 4 -- mA Output Sink Current Output Upper Clamp Voltage (note) Veao(H) Isource=0.1mA -- 6 -- V Output Lower Clamp Voltage (note) Veao(L) Isink=0.1mA -- 2.25 -- V (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2005.07.22 Page 2 of 8 SA7527 (Continued) Characteristics Large Signal Open Loop G gain (note) Symbol Gv Test condition Min. Typ. Max. Unit -- 60 80 -- dB Power Supply Rejection Ratio (note) PSRR 14V≤VCC≤25V 60 80 -- dB Unity Gain Bandwidth (note) GBW -- -- 1 -- MHz SR -- -- 0.6 -- V/µs Input Bias Current (pin3) Ib(m) -- -0.5 -- 0.5 µA M1 Input Voltage Range (pin3) ∆Vm1 -- 0 -- 3.8 V M2 Input Voltage Range (pin2) ∆Vm2 -- Vref -- Vref+2.5 V Slew Rate (note) Multiplier Section Multiplier Gain (note) Vm1=1V, Vm2=3.5V 0.36 0.44 0.52 1/V Vomax(m) K Vinv=0V, Vm1=4V 1.65 1.8 1.95 V ∆K/∆T -25≤Tamb≤125°C -- -0.2 -- %/°C Input Offset Voltage (note) Vio(cs) Vm1=0V, Vm2=2.2V -10 3 10 mV Input Bias Current Ib(cs) 0V≤Vcs≤1.7V -1 -0.1 1 µA Current Sense Delay To Output (note) td(cs) -- -- 200 500 ns Maximum Multiplier Output Voltage Temperature Stability Of K (note) Current Sense Section Zero Current Detect Section Input Voltage Threshold Vth(det) Vdet increasing 1.7 2 2.3 V Detect Hysteresis HY(det) -- 0.2 0.5 0.8 V Input Low Clamp Voltage Vclamp(I) Idet=-100µA 0.45 0.75 1 V Input High Clamp Voltage Vclamp(h) Idet=3mA 6.5 7.2 7.9 V 1V≤Vdet≤5V -1 -0.1 1 µA -- -- -- ±3 mA Input Bias Current Ib(det) Input High/Low Clamp Diode Current (note) Iclamp(d) Output Section Output Voltage High Voh IO=-10mA 10.5 11 -- V Output Voltage Low Voi IO=10mA -- 0.8 1 V Rising Time (note) tr CI=1nF -- 130 200 ns Falling Time (note) tf CI=1nF -- 50 120 ns Maximum Output Voltage Vomax(o) VCC=20V, IO=100µA 12 14 16 V Output Voltage With UVLO Activated Vomin(o) VCC=5V, IO=100µA -- -- 1 V td(rst) Vm1=1V, Vm2=3.5V -- 150 -- µs Restart Timer Section Restart Time Delay Over Voltage Protection Section Soft OVP Detecting Current Isovp -- 25 30 35 µA Dynamic OVP Detecting Current Idovp -- 35 40 45 µA Static OVP Threshold Voltage Vovp Vinv=2.7V 2.1 2.25 2.4 V Note: These parameters, although guaranteed, are not 100% tested in production. Multiplier gain: k = pin 4 _ threshold Vm1x( Vm2 − Vref ) ( Vm1 = Vpin3, Vm 2 = Vpin2) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2005.07.22 Page 3 of 8 SA7527 PIN CONFIGURATIONS SA7527 PIN DESCRIPTIONS Pin no. Pin name Description Inverting input of the error amplifier. The output of the boost 1 INV converter should be resistively divided to 2.5V and connected to this pin. 2 EA_OUT 3 MULT The output of the error amplifier. A feedback compensation network is placed between this pin and the INV pin. Input to the multiplier stage. The full-wave rectified AC voltage is divided to less than 2V and is connected to this pin. Input of the PWM comparator. The MOSFET current is sensed by a 4 CS resistor and the resulting voltage is applied to this pin. An internal R/C filter is included to reject any high frequency noise. 5 Idet Zero current detection input. 6 GND The ground potential of all the pins. 7 OUT 8 VCC Gate driver output. The push pull output stage is able to drive the Power MOSFET with peak current of 500mA. Supply voltage of driver and control circuits. ELECTRICAL CHARACTERISTICS CURVES Figure 1. Error Amplifier Output Voltage Figure 2. Multiplier Input Voltage vs Current Sensing Threshold vs Current Sensing Threshold .5V =1 V 1 1.0 Vm 1= m V (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2005.07.22 Page 4 of 8 SA7527 (Continued) Figure 3. Supply Current vs Supply Voltage 0.015 0.012 0.009 0.006 0.003 0.000 0 10 20 30 40 50 Supply Voltage (V) TEST CIRCUIT SA7527 TEST SPECIFICATION (Unless otherwise specified, VDC2=14V) Parameter Switches Test conditions Test Remark point Vth(st) S2,S3,S4,S5 VDC3=3,VDC4=1,VDC6=0 B VDC2 increase HY(st) S2,S3,S4,S5 VDC3=3,VDC4=1,VDC6=0 B I(st) S2,S3,S4,S5 VDC3=3,VDC4=1,VDC6=0 B VDC2= Vth(st)-0.2 I(cc) S2,S3,S4,S5 VDC3=3,VDC4=1,VDC6=0 B -- Icc(ovp) S1 VDC1=3 B -- Idcc S1,S3,S4,S7,S8 VDC6=0 B Vref S9 -- G Vref S9 -- G VDC2=14V 25V Ib(ea) S1 VDC1 change G -- I(source) S1,S2 VDC1=0,VDC3=4 A -- I(sink) S1,S2 VDC1=3,VDC3=4 A -- Veao(H) S1 VDC1=0 A The source current of A is 1mA Veao(L) S1 VDC1=3 A The sink current of A is 1mA Ib(m) S3 -- E VDC4: 0~4V Following above, decrease the VDC2 until C level changed Input 50kHz/2V square wave to F (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2005.07.22 Page 5 of 8 SA7527 (Continued) Parameter Switches Test conditions Test Remark point Increasing the VDC6 and VDC4, Vm1 S1,S3,S4,S5 VDC1=2, initialize VDC4,VDC6 low level, enable C high level E enables the C changes until the VDC4 change do not affect the C level. VDC1=2,VDC4=1, Vm2 S1,S2,S3,S4,S5 Increasing the VDC6 and VDC3 initialize VDC3, VDC6 low level, enable A C high level. level, enables the C changes until the VDC3 change do not affect the C level. Increase the VDC6 until C level K S1,S2,S3,S4 VDC1=2V,VDC3=3.5,VDC4=1V -- changed. K=VDC6/(VDC3*VDC4) Increase the VDC6 until C level Vomax S1,S3,S4,S5 VDC1=2V, VDC4=4 D Ib(cs) S4 -- D Vth(det) S1,S2,S3,S4,S6 HY(det) S1,S2,S3,S4,S6 Vclamp(L) -- -- G Input 100µA to G Vclamp(H) -- -- G Output 3mA from G Ib(det) S6 -- G VDC5:1~5V Voh S1,S2,S3,S4,S5 VDC1=2,VDC6=0 C Output 10mA from C Vol S1,S2,S3,S4,S5 VDC1=2,VDC6=2 C Input 10mA to C tr S1,S2,S3,S4,S7 VDC1=2,VDC6=0 C tf S1,S2,S3,S4,S7 VDC1=2,VDC6=0 C Vomax(o) S1,S2,S3,S4,S5 VDC1=2,VDC2=20 C Output 100µA from C Vomin(o) S1,S2,S3,S4,S5 VDC1=2,VDC2=5 C Output 100µA from C td(rst) S1,S2,S3,S5 VDC1=2,VDC3=3.5,VDC4=1 C Isovp S1,S3,S4,S5 VDC1=2,VDC6=0 A Idovp S1,S3,S4,S5 VDC1=2,VDC6=0 A Vovp S1,S2,S3,S4,S5 VDC1=2.7,VDC4=1,VDC6=0 A tf S1,S2,S3,S4,S7 VDC1=2,VDC6=0 C VDC1=2V, VDC3=3,VDC4=1, VDC6=0, VDC1=2V, VDC3=3,VDC4=1, VDC6=0, G G changed. VDC6:0~1.7V Increase the VDC5 until C level changed. Following above, the VDC5 decreases until C level changed. Input 50kHz/2V square wave to F Input 50kHz/2V square wave to F Input 10kHz, 10µs, 2V narrow pulse to D (note1) Input static current to A, and enables C low level. Input dynamic current to A, and enable C low level. Increase the VDC3 until C level changed. Input 50kHz/2V square wave to F HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2005.07.22 Page 6 of 8 SA7527 TYPICAL APPLICATION CIRCUIT Note:The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test . APPLICATION CIRCUIT COMPONENTS LIST Part Number Value Note Manufacturer R1 1.8MΩ 1/4W - R2 18kΩ 1/4W - R3 120kΩ 1W - R5 22kΩ 1/4W - R6 10Ω 1/4W - R7 3.0Ω 1W - R8 1MΩ 1/4W - R9 6kΩ 1/4W - VR1 103 Variable resistor - C1 47nF, 275vac Box-Cap - C2 100nF, 275vac Box-Cap - C3,4 2200pF, 3000V Y-Cap - C5 0.1µF, 630V Miller-Cap - C6 47µF, 35V Electrolytic - C7 1µF MLCC - C8 22µF, 450V Electrolytic - C9 1nF, 25V Ceramic - BD1 600V/4A Bridge Diode - D1,3 75V, 150mA IN4148 - D2 600V, 1A BYV26C - LF1 45mH Line Filter - T1 1.76mH(122T:10T) EI2219 - Q1 500V, 2.3A FQPF4N50 Fairchild F1 250V, 3A Fuse - V1 470V 471 - NTC 10Ω 10D09 - HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.0 2005.07.22 Page 7 of 8 SA7527 PACKAGE OUTLINE 3.00MIN 4.36MAX 6.35 ± 0.25 0.25±0.05 UNIT: mm 7.62 ± 0.30 DIP-8-300-2.54 SOP-8-225-1.27 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn UNIT: mm REV:1.0 2005.07.22 Page 8 of 8