KA7526 Fairchild Semiconductor, KA7526 Datasheet
KA7526
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KA7526 Summary of contents
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... Descriptions The KA7526 provides simple and high performance active power factor correction. KA7526 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 R/C filter eliminates the need for an external R/C filter ...
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... Maximum Current Sense Voltage 2.5V Ref 5V Internal + Bias - UVLO Timer R 240mV S Zero Current Detector R Current Sense Comparator Vref - + Vm2 Multiplier Vref~Vref+ OUT GND OUT Drive Output Q Over Voltage Protection + - 1.8V + Vref - 1 INV Vea(-) Error Amp KA7526 8/13V 0 ~ 3.8V Vref ~ Verf + 2V 1.65V ...
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... The zero current detector senses the inductor current by monitoring when the boost inductor auxilary 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. KA7526 Vcc 8 OUT 7 GND ...
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... KA7526 Absolute Maximum Ratings Parameter Supply voltage Peak drive output current Driver output clamping diodes V > <-0. Detector clamping diodes Error amp, multiplier and comparator input voltage Operating temperature range Storage temperature range (Note) Power dissipation (Note) Thermal resistance (Junction-to-air) Note : ...
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... Vref1 12V Vcc 25V Vref2 0mA Iref 2mA o o Vref3 -25 Ta 125 C C Ib(ea) - Isource Vm2=3V Isink Vm2=2V Veao No Load on E.A Output SR - Ib(m) - Vm1 - Vm2 - Vm1=1V, K Vm2=2.7 to 3.3V Vomax(m) Vea(-)=0V, Vm1= -25 Ta 125 C C KA7526 Min. Typ. Max. Unit 0.3 0 2. ...
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... KA7526 Electrical Characteristics (Continued) Parameter CURRENT SENSE SECTION (Note2) Input Offset Voltage Input Bias Current (Note2) Current Sense Delay to Output DETECT SECTION Detect Input Threshold Detect Hysteresis Input Low Clamp Voltage Input High Clamp Voltage Input Bias Current Input High/low Clamp Diode Current ...
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... Figure 4. Reference Voltage vs Temperature Fig6. UV Lockout Hysteresis vs Temperature 6.5 6.0 5.5 5.0 4.5 4.0 3.5 -40 -20 80 100 120 140 Figure 6. UV Lockout Hysteresis vs Temperature Veao=5V Veao=3.25V Veao=3V Veao=2.75V Veao=2. Multiplier Input Voltage [ 100 120 Ambient Temperature 100 120 Ambient Temperature () KA7526 5 140 140 7 ...
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... KA7526 Typical Performance Characteristics (continued) Fig7. Start-up Supply Current vs Temperature 0.40 0.36 0.32 0.28 0.24 0.20 0.16 0.12 0.08 0.04 0.00 -40 - Ambient Temperature Figure 7. Start-Up Supply Current vs Temperature Fig9. Sink Current vs Temperature -40 - Ambient Temperature Figure 9. EA Sink Current vs Temperature Fig.11 Multiplier Gain vs Temperature ...
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... Fig.14 Restart Time vs Temperature 600 500 400 300 200 100 0 80 100 120 140 -40 Figure 14. Restart Time vs Temperature Fig.16 Supply Current vs Temperature 100 120 140 -40 -20 Figure 16. Supply Current vs Temperature - 100 120 Ambient Temperature 100 120 Ambient Temperature KA7526 140 140 9 ...
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... KA7526 contains many of the building blocks and protection features that are employed in modern high performance current mode power supply controllers. A description of each of the function blocks is given below. ...
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... The equation below describes the relationship between multiplier output and inputs. Vmo = K Vm1 (Vm2-Vref Multiplier gain Vm1: Voltage at Pin 3 Vm2: Error amp output voltage Vmo: Multiplier output voltage 1.8V Over Voltage To Drive Comparator Output Shutdown + R1 - Vref + Vref Multiplier INV 2 EA OUT Ccomp R1 Ccomp) KA7526 11 ...
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... KA7526 Current Sense Comparator The current sense comparator adopt the RS latch configuration to ensure that only a single pulse appears at the drive output during a given cycle. MOSFET drain current is converted to voltage using an external sense resistor in series with the external power MOSFET. When sense voltage exceeds the threshold set by the multiplier output, the current sense comparator termi- nates the gate drive to the MOSFET and resets the PWM latch ...
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... Zero Current Detector KA7526 operates as a critical conduction current mode controller. The power MOSFET is turned on by the zero current detec- tor and turned off when the peak inductor current reaches the threshold level established by the multiplier output. The slope of the inductor current is indirectly detected by monitoring the voltage across a separate winding and connecting it to the zero current detector Pin 5 ...
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... KA7526 APPLICATION CIRCUIT #1 < 265V Input, 400V , 32W 2 Lamps Self-oscillating Ballast > Fuse AC Input GND R13 R6 R10 KA7526 C10 R11 Q3 R15 R8 R14 R17 L3 L5 R18 C11 Lamp Lamp 1 2 C14 C15 D8 R16 C13 L5 C12 C16 ...
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... N413N (DIAC 2519 EI 2820 SB5S 10uH BS24-100K - 52NM250V, 3A 430V INR140, 431 - 500V, 4.5A 400V, 5A KSC5305D Manufacturer - - - - - - - - - - - - MEP-CAP - Y-CAP - MPE-CAP - - Ceramic - Ceramic - - PPF-CAP - PPF-CAP - MPF-CAP - Ceramic - PP-CAP - MEP-CAP - IN4007GP - BYV26C Philips IN4148 - - DIT-010 - DBT-002 - DPT-086 - DDT-005 - - - - KA7526 FairChild QFP6N50 FairChild FairChild KA7526 15 ...
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... Lamps External-oscillating Ballast > Fuse Input PFC Output + C9 To Full-wave Rectified Output R12 C10 16 Full-wave Rectified Output D6 NTC R10 R14 T1 C14 Q3 R11 KA7541 R13 C13 C11 C12 L2 PFC Output KA7526 R15 C19 C15 L3 C17 Lamp1 Lamp2 L4 R16 C18 C20 R16 R17 R18 R19 ...
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... FRD(25nS) 75V, 150mA 1000V, 1.5A 80mH 3.1mH - 52NM250V, 3A 430V INR140, 431 500V, 6A 15V, 1W Manufacturer - - - - - - - - - - - - - - - MEP-CAP - Y-CAP - MPE-CAP - - MPE-CAP - MPE-CAP - - - MPE-CAP - Ceramic - MPE-CAP - MPE-CAP - MPE-CAP - MPE-CAP - 1N4007 - BYV26C Philips 1N4148 - 1N4937 - BSF2125 - EI2820 - EI2820 - EE1614 - - - SKP6N50 FairChild - - KA7526 17 ...
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... KA7526 Mechanical Dimensions Package 6.40 0.20 0.252 0.008 # 7.62 0.300 18 Dimensions in millimeters 8-DIP 5.08 MAX 0.200 3.40 0.33 0.20 MIN 0.013 0.134 0.008 3.30 0.30 0.130 0.012 ...
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... Mechanical Dimensions Package #1 #4 6.00 0.236 3.95 0.156 0.225 0.50 0.20 0.020 0.008 (Continued) 8-SOP 1.55 0.20 0.061 0.008 #8 #5 0.30 1.80 MAX 0.012 0.071 0.20 0.008 5.72 Dimensions in millimeters 0.1~0.25 MIN 0.004~0.001 KA7526 19 ...
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... KA7526 Ordering Information Product Number Package KA7526 8-DIP KA7526D 8-SOP 20 Operating Temperature o -25 ~ +125 C ...
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... KA7526 21 ...
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... KA7526 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. ...