www.fairchildsemi.com FAN7527 Power Factor Correction Controller Features Description • Internal Startup Timer • Internal R/C filter eliminates the Need for an External R/C filter • Very Precise Adjustable Output Over Voltage Protection • Zero Current Detector • One Quadrant Multiplier • Trimmed 1.5% Internal Bandgap Reference • Under Voltage Lock Out with 3V of Hysteresis • Totem Pole Output with High State Clamp • Low Startup and Operating Current • 8-Pin DIP or 8-Pin SOP The FAN7527 provides simple and high performance active power factor correction. FAN7527 is optimized for electronic ballast and low power, high density power supplies which require minimum board area reduced component count and low power dissipation. Internal R/C filter eliminates the need for an external R/C filter. Internally clamping the error amplifier and multiplier outputs, improves turn on overshoot characteristics and current limiting. Special circuitry has also been added to prevent no load runaway conditions. Independent of supply voltage, the output drive clamping circuit limits overshoot of the power MOSFET gate drive. This greatly enhances the system reliability. Applications • Electronic Ballast • SMPS 8-DIP 1 8-SOP 1 Rev 1.0.3 ©2001 Fairchild Semiconductor Corporation FAN7527 Internal Block Diagram Vcc 8 Vcc 2.5V Ref + UVLO Internal Internal Bias Drive Output 12V ↔ 9V 7 OUT 1 INV Timer R Idet 5 S + 6.5V 7.2V - 2V ↔ 1.5V Zero Current Detector Static OVP Q 40K CS + + 4 R 8pF 2.25V - Current Sense Comparator Vref 1.8V Veao(L) = 2.25V Vmo 0.25V - Vm1 MULT 3 + + - 0 ~ 3.8V Vm2 Vref ~ Vref+2.5V Multiplier K = 2 Vref Vea(-) Error Amp OVP Current Detector Vmo Vm1 * (Vm2-Vref) GND 6 2 GND EA_OUT Isovp=30uA Idovp=40uA FAN7527 PIN Description INV 1 8 Vcc EA_OUT 2 7 OUT MULT 3 6 GND CS 4 5 ldet (Top View) Pin Number Pin Name Pin Function Descrition 1 INV Inverting input of the error amplifier. The output of the boost converter should be resistively divided to 2.5V and connected to this pin. 2 EA_OUT The output of the error amplifier. A feedback conpensation network is placed between this pin and the INV pin. 3 MULT Input to the multiplier stage. The full-wave rectified AC is devided to less than 2V and is connected to this pin. Input to the PWM comparator. Current is sensed in the boost stage MOSFET by a resistor in the source lead. An internal leading edge blanking circuitry has been included to reject any high frequency noise present on the current waveform. 4 CS 5 ldet 6 GND The ground potential of all the pins. 7 OUT Gate driver output . A push pull output stage is able to drive the Power MOSFET with peak current of 400mA. 8 Vcc Supply voltage of driver and control circuits. The zero current detector senses the inductor current by monitoring when the boost inductor auxilary winding voltage falls below 1.8V. If it is connected to GND, the device is disabled. 3 FAN7527 Absolute Maximum Ratings (Ta=25°°C) Characteristics Symbol Value Unit VCC 30 V Peak Drive Output Current IOH,IOL ±500 mA Driver Output Clamping Diodes Vo > Vcc or Vo < -0.3V lclamp ±10 mA Detector Clamping Diodes ldet ±10 mA Error Amp, Multiplier And Comparator Input Voltages Vin -0.3 to 6 V Supply Voltage Tj 150 °C Operating Temperature Range Topr -25 to 125 °C Storage Temperature Range Tstg -65 to 150 °C Pd 0.8 W Operating Junction Temperature Power Dissipation Temperature Characteristics (-25°°C ≤ Ta ≤ 125°°C) 4 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 FAN7527 Electrical Characteristics VCC= 14V, -25°C ≤ Ta ≤ 125°C, unless otherwise stated. Characteristics Symbol Test Condition Min. Typ. Max. Unit 10.5 11.5 12.5 V 2 3 4 V 20 60 100 uA - 3 6 mA Vinv = 3V - 1.7 4 mA 50KHz, CI = 1nF - 4 8 mA Iref =0mA, Ta =25°C 2.465 2.5 2.535 V 0 ≤ Ta ≤ 125°C 2.44 2.5 2.56 V < UNDER VOLTAGE LOCK OUT SECTION> Start Threshold Voltage Vth(st) UVLO Hysteresis HY(st) Vcc Increasing - < SUPPLY CURRENT SECTION > Start-up Supply Current Ist Vcc =Vth(st) -0.2V Operating Supply Current Icc Output not switching Operating Current at OVP Icc(ovp) Dynamic Operating Supply Current Idcc < ERROR AMPLIFIER SECTION > Voltage Feedback Input Threshold Vref Line Regulation ∆Vref1 14V ≤ Vcc ≤ 25V - 0.1 10 mV Temperature Stability Of Vref (Note1) ∆Vref3 -25 ≤ Ta ≤ 125°C - 20 - mV Input Bias Current Ib(ea) -0.5 - 0.5 uA Output Source Current Isource Vm2 = 4V -2 -4 - mA Isink Vm2 = 4V 2 4 - mA - 6 - V Output Sink Current - Output Upper Clamp Voltage (Note2) Veao(H) Isource = 0.1mA Output Lower Clamp Voltage (Note3) Veao(L) Isink = 0.1mA Large Signal Open Loop Gain (Note4) Gv Power Supply Rejection Ratio (Note5) PSRR Unity Gain Bandwith (Note6) GBW - 2.25 - V 60 80 - dB 60 80 - dB - - 1 - MHz SR - - 0.6 - V/us Input Bias Current (Pin3) Ib(m) - -0.5 - 0.5 uA M1 Input Voltage Range (Pin3) ∆Vm1 - 0 - 3.8 V M2 Input Voltage Range (Pin2) ∆Vm2 - Vref - Vref+2.5 V Slew Rate (Note7) 14V ≤ Vcc ≤ 25V < MULTIPLIER SECTION> Multiplier Gain (Note8) Maximum Multiplier Output Voltage Temperature Stability Of K (Note9) K Vm1 = 1V, Vm2 = 3.5V Vomax(m) Vinv =0V, Vm1 = 4V ∆K/∆T -25 ≤ Ta ≤ 125°C 0.36 0.44 0.52 1/V 1.65 1.8 1.95 V - -0.2 - %/°C 5 FAN7527 Electrical Characteristics(Continued) VCC= 14V, -25°C ≤ Ta ≤ 125°C, unless otherwise stated. Characteristics Symbol Test Condition Min. Typ. Max. Unit < CURRENT SENSE SECTION> Input Offset Voltage (Note8) Vio(cs) Vm1=0V , Vm2 = 2.2V -10 3 10 mV Input Bias Current Ib(cs) 0V ≤ Vcs ≤ 1.7V -1 -0.1 1 uA Current Sense Delay To Output (Note11) tb(cs) - 200 500 ns 1.7 2 2.3 V - < DETECT SECTION > Input Voltage Threshold Detect Hysteresis Vth(det) Vdet Increasing HY(det) - 0.2 0.5 0.8 V Idet = -100uA 0.45 0.75 1 V 6.5 7.2 7.9 V -1 -0.1 1 uA - - ±3 mA Input Low Clamp Voltage Vclamp(I) Input High Clamp Voltage Vclamp(h) Idet = 3mA Input Bias Current Input High/low Clamp Diode Current (Note12) Ib(det) 1V ≤ Vdet ≤ 5V Iclamp(d) - < OUTPUT SECTION > Output Voltage High Voh Io = -10mA 10.5 11 - V Output Voltage Low VoI Io = 10mA - 0.8 1 V CI = 1nF - 130 200 ns Rising Time (Note13) Falling Time (Note14) tr - 50 120 ns Maximum Output Voltage Vomax(o) tf Vcc = 20V, Io = 100uA CI = 1nF 12 14 16 V Output Voltage With UVLO Activated Vomin(o) Vcc = 5V , Io = 100uA - - 1 V td(rst) Vm1 = 1V, Vm2 = 3.5V - 500 - us < RESTART TIMER SECTION> Restart Time Delay <OVER VOLTAGE PROTECTION SECTION> Soft OVP Detecting Current Isovp - 25 30 35 uA Dynamic OVP Detecting Current Idovp - 35 40 45 uA Static OVP Threshold Voltage Vovp Vinv = 2.7V 2.1 2.25 2.4 V Note : 1 ~ 14 These parameters, although guaranteed, are not 100% tested in production. Pin4_Threshold Multiplier Gain: K = ------------------------------------------------------- ...... ( Vm1 = Vpin3,Vm2 = Vpin2 ) Vm1 × ( Vm2 – Vref ) 6 FAN7527 Typical Performance Characteristics Fig.2 Multiplier Input Voltage vs. C.S. Threshold Fig.1 E.A. Output Voltage vs. C.S. Threshold 2.0 2.0 Vm1=3.0V Vm1=2.5V Vm1=2.0V Vm1=1.5V 1.5 C.S. Threshold Voltage(V) C.S Threshold Voltage(V) Veao=4.25V Veao=4.0V Veao=3.75V 1.8 Vm1=3.5V Vm1=4.0V Vm1=1.0V 1.0 Vm1=0.5V 0.5 1.6 Veao=4.5V Veao=3.5V Veao=3.25V 1.4 1.2 Veao=3.0V 1.0 0.8 Veao=2.75V 0.6 0.4 Veao=2.5V 0.2 Vm1=0V 0.0 0.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 1 EA Output Voltage(V) 2 3 4 5 Multiplier Input Voltage(V) Figure 2. Multiplier Input Voltage vs Current Sensing Threshold Figure 1. Error Amplifier Output Voltage vs Current Sensing Threshold Fig.4 Reference Voltage vs. Temperature Fig.3 Supply Current vs. Supply Voltage 2.7 0.015 Reference Voltage(V) Supply Current(A) 0.012 0.009 0.006 2.6 2.5 2.4 0.003 0.000 2.3 0 10 20 30 40 50 -25 0 25 Supply Voltage(V) 50 75 100 125 Temperature (℃) Figure 4. Reference Voltage vs Temperature Figure 3. Supply Current vs Supply Voltage Fig.6 UV Lockout Hysteresis vs. Temperature Fig.5 Start-up Threshold vs. Temperature 5 14 4 UV Lockout Hyteresis(V) Startup Threshold(V) 12 10 8 6 4 3 2 1 2 0 0 -25 0 25 50 75 100 Temperature (℃) Figure 5. Start-Up Threshold vs Temperature 7 125 -25 0 25 50 75 100 125 Temperature (℃) Figure 6. UV Lockout Hysteresis vs Temperature FAN7527 Typical Performance Characteristics (continued) Fig.7 Start-up Supply Current vs. Temperature Fig.8 E.A. Source CurrenT vs. Temperature 100 0 90 -1 EA Source Current(mA) Start-up Supply Current(uA) 80 70 60 50 40 30 20 -2 -3 -4 10 0 -5 -25 0 25 50 75 100 125 -25 0 25 Temperature (℃) 50 75 100 125 Temperature (℃) Figure 8. Error Amplifier Source Current vs Temperature Figure 7. Start-Up Supply Current vs Temperature Fig.10 E.A. Input Bias Current vs. Temperature Fig.9 E.A. Sink Current vs. Temperature 0.5 5 0.4 EA Input Bias Current(uA) EA Sink Current(mA) 4 3 2 1 0.3 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 0 -25 0 25 50 75 100 -25 125 0 25 100 125 Fig.12 Idet Threshold Voltage vs. Temperature Fig.11 Multiplier Gain vs. Temperature 1.0 4.0 0.8 3.2 Idet Threshold Voltage(V) Multiplier Gain(1/V) 75 Figure 10. Error Amplifier Input Bias Current vs Temperature Figure 9. Error Amplifier Sink Current vs Temperature 0.6 0.4 0.2 0.0 2.4 1.6 0.8 0.0 -25 0 25 50 75 100 Temperature (℃) Figure 11. Multiplier Gain vs Temperature 8 50 Temperature (℃) Temperature (℃) 125 -25 0 25 50 75 100 125 Temperature (℃) Figure 12. ldet Threshold Voltage vs Temperature FAN7527 Typical Performance Characteristics (continued) Fig.13 Idet Input Hysteresis vs. Temperature Fig.14 Restart Time vs. Temperature 1.0 1000 900 800 700 Restart Time(uS) Idet Input Hysteresis(mV) 0.8 0.6 0.4 0.2 600 500 400 300 200 100 0.0 0 -25 0 25 50 75 100 125 -25 0 25 Temperature (℃) 75 100 125 Figure 14. Restart Time vs Temperature Figure 13. ldet Input Hysteresis vs Temperature Fig.15 Max. Mult. Output Voltage vs. temperature Fig.16 Supply Current vs. Temperature 2.0 5 1.6 4 Supply Current(mA) Maximum Mult. Output Voltage(V) 50 Temperature (℃) 1.2 0.8 3 2 1 0.4 0 0.0 -25 0 25 50 75 100 125 Temperature (℃) Figure 15. Max.Mult.Output Voltage vs Temperature -25 0 25 50 75 100 125 Temperature (℃) Figure 16. Supply Current vs Temperature 9 FAN7527 Mechanical Dimensions Package Dimensions in millimeters 1.524 ±0.10 #5 2.54 0.100 5.08 MAX 0.200 7.62 0.300 3.40 ±0.20 0.134 ±0.008 +0.10 0.25 –0.05 +0.004 0~15° 10 0.010 –0.002 3.30 ±0.30 0.130 ±0.012 0.33 MIN 0.013 0.060 ±0.004 #4 0.018 ±0.004 #8 9.60 MAX 0.378 #1 9.20 ±0.20 0.362 ±0.008 ( 6.40 ±0.20 0.252 ±0.008 0.46 ±0.10 0.79 ) 0.031 8-DIP FAN7527 Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-SOP MIN #5 6.00 ±0.30 0.236 ±0.012 8° 0~ +0.10 0.15 -0.05 +0.004 0.006 -0.002 MAX0.10 MAX0.004 1.80 MAX 0.071 3.95 ±0.20 0.156 ±0.008 5.72 0.225 0.41 ±0.10 0.016 ±0.004 #4 1.27 0.050 #8 5.13 MAX 0.202 #1 4.92 ±0.20 0.194 ±0.008 ( 0.56 ) 0.022 1.55 ±0.20 0.061 ±0.008 0.1~0.25 0.004~0.001 0.50 ±0.20 0.020 ±0.008 11 FAN7527 Ordering Information Product Number 12 Package FAN7527 8-DIP FAN7527D 8-SOP Operating Temperature -25 ~ +125oC FAN7527 13 FAN7527 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 7/23/01 0.0m 001 Stock#DSxxxxxxxx 2001 Fairchild Semiconductor Corporation