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KA7525B Dataheets PDF



Part Number KA7525B
Manufacturers Fairchild
Logo Fairchild
Description Power Factor Correction Controller
Datasheet KA7525B DatasheetKA7525B Datasheet (PDF)

www.fairchildsemi.com Power Factor Correction Controller Features • Internal Start-up Timer • Internal Current Sense Blanking Which Eliminates the Need for an External R/C filter • Overvoltage Comparator Eliminates Runaway Output Voltage • Zero Current Detector • One Quadrant Multiplier • Trimmed 1.5% Internal Bandgap Reference • Under Voltage Lock Out with 2.1V of Hysteresis • Totem Pole Output with High State Clamp • Low Start-up and Operating Current • 8-Pin DIP or 8-Pin SOP. KA7525B Descr.

  KA7525B   KA7525B


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www.fairchildsemi.com Power Factor Correction Controller Features • Internal Start-up Timer • Internal Current Sense Blanking Which Eliminates the Need for an External R/C filter • Overvoltage Comparator Eliminates Runaway Output Voltage • Zero Current Detector • One Quadrant Multiplier • Trimmed 1.5% Internal Bandgap Reference • Under Voltage Lock Out with 2.1V of Hysteresis • Totem Pole Output with High State Clamp • Low Start-up and Operating Current • 8-Pin DIP or 8-Pin SOP. KA7525B Description The KA7525B provides simple and high performance active power factor correction. KA7525B is optimized for electronic ballast and low power, high density power supplies requiring a minimum board area, reduced component count and low power dissipation. Addition of internal current sense blanking (Internal R,C) eliminates the need for an external R/C filter. Internal clamping of 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. Output drive clamps limiting power MOSFET gate drive independent of supply voltage greatly enhance the products practical application. Applications • Electronic Ballast • SMPS 8-DIP 1 8-SOP 1 Rev.1.0.1 ©2002 Fairchild Semiconductor Corporation KA7525B Pin Assignments INV 1 8 Vcc EA OUT 2 7 OUT MULT 3 6 GND CS 4 5 Idet (Top View) Pin Definitions Pin Number 1 2 3 Pin Name INV EA_OUT MULT Pin Function Description Inverting input of the error amplifier. The output of the Boost converter should be resistively divided to 2.5V 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 of the multiplier stage. The full-wave rectified AC is divided to less than 2V and is connected to this pin. Input of 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. The zero current detector senses the inductor current by monitoring when the Boost inductor auxiliary winding voltage falls below 1.8V. The ground potential of all the pins. The output of a high current power driver capable of driving the gate of a power MOSFET. The logic and control power supply connection. 4 CS 5 6 7 8 Idet GND OUT Vcc 2 KA7525B Internal Block Diagram Vcc 8 2.5V Ref + _ 36V 10V 2.1V UVLO Internal Bias Vcc 7 OUT Drive Output Timer R Q Idet 5 7.5V 1.8V + _ 240mV S Over Voltage Protection + _ Zero Current Detector - CS 4 R,C Filter 1.24V + R Current Sense Comparator Vref - 1.8V Vmo MULT 3 Vm1 0 ~2V Multiplier + Vm2 Vref ~ Vref+1V + _ Vref Vea(-) 1 INV K= Pin4 Threshold(Vmo) Vm1× (Vm2-Vref) Error Amp 6 GND 2 EA OUT Absolute Maximum Ratings Parameter 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 Temperature Range Storage Temperature Range Power Dissipation Thermal Resistance (Junction-to-Air) Symbol VCC Ioh, IoI Iclamp Idet Vin Topr Tstg Pd Rθja Value 30 ±500 ±10 ±10 -0.3 to 6 0 to 125 -65 to 150 0.8 100 Unit V mA mA mA V °C °C W °C/W Temperature Characteristics (0°C ≤ Ta ≤ 125°C ) Characteristics Temperature Stability for Reference Voltage(Vref) Temperature Stability for Multiplier Gain(K) Symbol ∆Vref (Typ) ∆K/∆T (Typ) Value 20 -0.2 Unit mV %/°C 3 KA7525B Electrical Characteristics Unless otherwise specified, these specifications apply over the operating ambient temperatures for the KA7525B with 0°C ≤ Ta ≤ 125°C and Vcc=12V. Parameter Start Threshold Voltage UVLO Hysteresis Supply Zener Voltage SUPPLY CURRENT SECTION Start-Up Supply Current Operating Supply Current Dynamic Operating Supply Current ERROR AMPLIFIER SECTION Voltage Feedback Input Threshold Line Regulation Load Regulation (Note1) Temperature Stability of Vref (Note2) Input Bias Current Output Source Current Output Sink Current Output Voltage Range (Note2) Slew Rate (Note2) MULTIPLIER SECTION Input Bias Current(Pin3) M1 Input Voltage Range (Pin3) M2 Input Voltage Range (Pin2) Multiplier Gain(Note3) Maximum Multiplier Output Voltage Temperature Stability of K (Note2) Ib(m) ∆Vm1 ∆Vm2 K Vomax(m) ∆K/∆T Vm1=1V, ∆Vm2= 2.7 to 3.3V Vea(-) = 0V, Vm1=2V 0°C ≤ Ta ≤ 125°C -0.5 0 Vref 0.55 1.1 0.68 1.24 -0.2 0.5 2 Vref+1 0.8 1.45 µA V V 1/V V %/°C Vref ∆Vref1 ∆Vref2 ∆Vref3 Ib(ea) Isource Isink ∆Veao SR Vm2=3V Vm2=2V No Load on EA Out Iref=0mA 0°C ≤ Ta ≤ 125°C 12V ≤ Vcc ≤ 25V 0mA ≤ Iref ≤ 2mA 0°C ≤ Ta ≤ 125°C 2.465 2.44 -0.5 -2 3 1.2 2.5 0.1 0.1 20 -4.5 4.5 0.6 2.535 2.56 10 10 0.5 3.6 V V mV mV mV µA mA mA V V/µs Ist Icc Idcc Vcc < Vth(st) No Output Switching 50kHz, CI =1nF 0.2 4 5 0.3 8 10 mA mA mA Symbol Vth (st) HY(st) Vz Icc=10mA Conditions Vcc Increasing Min. 9 1.7 30 Typ. 10 2.1 36 Max. 11 2.5 Unit.


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