FAN7527B. Power Factor Correction Controller. Features. Description. Applications.

Transcription

1 Power Factor Correction Controller Features Internal start-up 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.5% internal band gap reference Under voltage lockout with 3V of hysteresis Totem pole output with high state clamp Low start-up and operating current 8-Pin DIP or 8-Pin SOP Description The provides simple and high performance active power factor correction. The 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. 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. Applications Electronic ballast SMPS 8-DIP 8-SOP Rev.. 3 Fairchild Semiconductor Corporation

2 Internal Block Diagram Vcc 8.5V Ref Vcc + UVLO Internal Bias.5V 8.5V Drive Output 7 OUT Timer R Idet 5 + S 7.V V.5V Zero Current Detector Q CS k 8pF + Current Sense Comparator Vref R Static OVP +.5V.8V Veao(L)=.5V MULT 3 Vm ~ 3.8V Vmo Multiplier Vmo K = Vm ( Vm Vref) +.5V Vm OVP Current Detector Vref~Vref+.5V Isovp=3uA Idovp=uA + Error Amp Vref Vea(-) INV 6 GND EA_OUT

3 PIN Description INV 8 Vcc EA_OUT 7 OUT MULT 3 6 GND CS 5 ldet (Top View) Pin Number Pin Name Pin Function Description INV EA_OUT 3 MULT Inverting input of the error amplifier. the output of the boost converter should be resistively divided to.5v and connected to this pin. 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 V and is connected to this pin. CS Input of the PWM comparator. the MOSFET current is sensed by a resistor and the resulting voltage is applied to this pin. an internal R/C filter is included to reject any high frequency noise. 5 ldet Zero current detection input. 6 GND The ground potential of all the pins. 7 OUT Gate driver output. the push pull output stage is able to drive the power MOSFET with peak current of 5mA. 8 Vcc Supply voltage of driver and control circuits. 3

4 Absolute Maximum Ratings (Ta=5 C) Characteristics Symbol Value Unit Supply voltage VCC 3 V Peak drive output current IOH,IOL ±5 ma Driver output clamping diodes Vo > Vcc or Vo < -.3V lclamp ± ma Detector clamping diodes ldet ± ma Error amp, multiplier and comparator input voltages Vin -.3 to 6 V Operating junction temperature Tj 5 C Operating temperature range Topr -5 to 5 C Storage temperature range Tstg -65 to 5 C Power dissipation 8-DIP. Pd 8-SOP.8 W Thermal Data Characteristics Symbol Value Unit 8-DIP Thermal resistance junction-ambient Max. Rθja C/W 8-SOP 5 Temperature Characteristics (-5 C Ta 5 C) Characteristics Symbol Min. Typ. Max. Unit Temperature stability for reference voltage (Vref) Vref - - mv Temperature stability for multiplier gain (K) K/ T %/ C

5 Electrical Characteristics VCC= V, -5 C Ta 5 C, unless otherwise stated. Characteristics Symbol Test Condition Min. Typ. Max. Unit < UNDER VOLTAGE LOCKOUT SECTION> Start threshold voltage Vth(st) Vcc Increasing V UVLO hysteresis HY(st) - 3 V < SUPPLY CURRENT SECTION > Start-up supply current Ist Vcc = Vth(st) -.V 6 ua Operating supply current Icc Output not switching ma Operating current at OVP Icc(ovp) Vinv = 3V -.7 ma Dynamic operating supply current Idcc 5kHz, CI = nf - 8 ma < ERROR AMPLIFIER SECTION > Voltage feedback input threshold Vref Iref = ma, Ta = 5 C V -5 Ta 5 C V Line regulation Vref V Vcc 5V -. mv Temperature stability of Vref (Note) Vref3-5 Ta 5 C - - mv Input bias current Ib(ea) ua Output source current Isource Vm = V ma Output sink current Isink Vm = V - ma Output upper clamp voltage (Note) Veao(H) Isource =.ma V Output lower clamp voltage (Note3) Veao(L) Isink =.ma V Large signal open loop gain (Note) Gv db Power supply rejection ratio (Note5) PSRR V Vcc 5V db Unity gain bandwidth (Note6) GBW MHz Slew rate (Note7) SR V/us < MULTIPLIER SECTION> Input bias current (pin3) Ib(m) ua M input voltage range (pin3) Vm V M input voltage range (pin) Vm - Vref - Vref+.5 V Multiplier gain (Note8) K Vm = V, Vm = 3.5V /V Maximum multiplier output voltage Vomax(m) Vinv =V, Vm = V V Temperature stability of K (Note9) K/ T -5 Ta 5 C %/ C 5

6 Electrical Characteristics (Continued) VCC= V, -5 C Ta 5 C, unless otherwise stated. Characteristics Symbol Test Condition Min. Typ. Max. Unit < CURRENT SENSE SECTION> Input offset voltage (Note8) Vio(cs) Vm=V, Vm =.V - 3 mv Input bias current Ib(cs) V Vcs.7V - -. ua Current sense delay to output (Note) td(cs) ns < ZERO CURRENT DETECT SECTION > Input voltage threshold Vth(det) Vdet increasing.7.3 V Detect hysteresis HY(det) V Input low clamp voltage Vclamp(I) Idet = -ua.5.75 V Input high clamp voltage Vclamp(h) Idet = 3mA V Input bias current Ib(det) V Vdet 5V - -. ua Input high/low clamp diode current (Note) Iclamp(d) ±3 ma < OUTPUT SECTION > Output voltage high Voh Io = -ma.5 - V Output voltage low VoI Io = ma -.8 V Rising time (Note3) tr CI = nf - 3 ns Falling time (Note) tf CI = nf - 5 ns Maximum output voltage Vomax(o) Vcc = V, Io = ua 6 V Output voltage with UVLO activated Vomin(o) Vcc = 5V, Io = ua - - V < RESTART TIMER SECTION> Restart time delay td(rst) Vm = V, Vm = 3.5V us <OVER VOLTAGE PROTECTION SECTION> Soft OVP detecting current Isovp ua Dynamic OVP detecting current Idovp ua Static OVP threshold voltage Vovp Vinv =.7V..5. V Note ~ : These parameters, although guaranteed, are not % tested in production. Pin_Threshold Multiplier Gain: K = Vm ( ( Vm Vref) Vm = Vpin3,Vm = Vpin ) 6

7 Typical Performance Characteristics CS C.S Threshold Voltage(V) Fig. E.A. Output Voltage vs. C.S. Threshold. Vm=3.V Vm=.5V Vm=.V Vm=3.5V.5 Vm=.5V Vm=.V Vm=.V. Vm=.5V.5 Vm=V EA Output Voltage(V) CS Threshold Voltage(V) C.S. Threshold Voltage(V) Fig. Multiplier Input Voltage vs. C.S. Threshold Veao=.5V Veao=.V Veao=3.75V Veao=.5V Veao=3.5V Veao=3.5V Veao=3.V Veao=.75V Veao=.5V 3 5 Multiplier Input Voltage(V) Figure. Error Amplifier Output Voltage vs Current Sensing Threshold Figure. Multiplier Input Voltage vs Current Sensing Threshold Fig.3 Supply Current vs. Supply Voltage 5 Fig. Reference Voltage vs. Temperature.7 Supply Current(A) Reference Voltage(V) Supply Voltage(V) Figure 3. Supply Current vs Supply Voltage Figure. Reference Voltage vs Temperature Fig.5 Start-up Threshold vs. Temperature Fig.6 UV Lockout Hysteresis vs. Temperature 5 Startup Threshold(V) 8 6 UV Lockout Hyteresis(V) Figure 5. Start-Up Threshold vs Temperature Figure 6. UV Lockout Hysteresis vs Temperature 7

8 Typical Performance Characteristics (Continued) Fig.7 Start-up Supply Current vs. Temperature Fig.8 E.A. Source CurrenT vs. Temperature 9 Start-up Supply Current(uA) EA Source Current(mA) Figure 7. Start-Up Supply Current vs Temperature Figure 8. Error Amplifier Source Current vs Temperature Fig.9 E.A. Sink Current vs. Temperature 5 Fig. E.A. Input Bias Current vs. Temperature.5. EA Sink Current(mA) 3 EA Input Bias Current(uA) Figure 9. Error Amplifier Sink Current vs Temperature Figure. Error Amplifier Input Bias Current vs Temperature Fig. Multiplier Gain vs. Temperature. Fig. Idet Threshold Voltage vs. Temperature. Multiplier Gain(/V) Idet Threshold Voltage(V) Figure. Multiplier Gain vs Temperature Figure. ldet Threshold Voltage vs Temperature 8

9 Typical Performance Characteristics (Continued) Fig.3 Idet Input Hysteresis vs. Temperature. 5 Idet Input Hysteresis(mV) Restart Time(us) Temperature( ) Figure 3. ldet Input Hysteresis vs Temperature Figure. Restart Time vs Temperature Fig.5 Max. Mult. Output Voltage vs. temperature. Fig.6 Supply Current vs. Temperature 5 Maximum Mult. Output Voltage(V) Supply Current(mA) Figure 5. Max.Mult.Output Voltage vs Temperature Figure 6. Supply Current vs Temperature 9

10 Mechanical Dimensions Package Dimensions in millimeters 8-DIP # 6. ±.5 ±8 #8.79 ( ) 3 9. ±.36 ±8.6 ± # # MAX 8 ±.5 ± 6 ± MAX 3. ±.3 ± MIN 3.3 ±.3.3 ± ~

11 Mechanical Dimensions (Continued) Package Dimensions in millimeters 8-SOP Symbol Min Nom Max A A.5.5 A B C.9.5 D E e.7bsc H h L GP.36 BSC q - 8 aaa bbb - -

12 Ordering Information Product Number Package Operating Temperature N 8-DIP -5 ~ +5 o C M 8-SOP 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:. 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.. 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. 8/6/3 m Stock#DSxxxxxxxx 3 Fairchild Semiconductor Corporation