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KA3525A Dataheets PDF



Part Number KA3525A
Manufacturers Fairchild
Logo Fairchild
Description SMPS CONTROLLER
Datasheet KA3525A DatasheetKA3525A Datasheet (PDF)

KA3525A SMPS Controller www.fairchildsemi.com Features • 5V ±1% Reference • Oscillator Sync Terminal • Internal Soft Start • Deadtime Control • Under Voltage Lockout Description The KA3525A is a monolithic integrated circuit that includes all of the control circuits necessary for a pulse width modulating regulator. There are a voltage reference, an error amplifier, a pulse width modulator, an oscillator, an under voltage lockout, a soft start circuit, and the output driver in the chip. 16-DIP.

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KA3525A SMPS Controller www.fairchildsemi.com Features • 5V ±1% Reference • Oscillator Sync Terminal • Internal Soft Start • Deadtime Control • Under Voltage Lockout Description The KA3525A is a monolithic integrated circuit that includes all of the control circuits necessary for a pulse width modulating regulator. There are a voltage reference, an error amplifier, a pulse width modulator, an oscillator, an under voltage lockout, a soft start circuit, and the output driver in the chip. 16-DIP Internal Block Diagram 1 VREF 16 VCC 15 GND 12 BAND GAP REF 5V U.V.L.O. EA(-) 1 EA(+) 2 EAOUT 9 _ ERR AMP + C8 (SOFT START) 5K 10 SHUT DOWN CT 5 7 5K DISCHARGE _ PWM COMP + LATCH SR OSCILLATOR F/F Q Q 36 SYNC RT 4 OSC OUTPUT VC 13 11 OUTPUT A 14 OUTPUT B ©2002 Fairchild Semiconductor Corporation Rev. 1.0.1 KA3525A Absolute Maximum Ratings Parameter Supply Voltage Collector Supply Voltage Output Current, Sink or Source Reference Output Current Oscillator Charging Current Power Dissipation (TA = 25°C) Operating Temperature Storage Temperature Lead Temperature (Soldering, 10sec) Symbol VCC VC IO IREF ICHG(OSC) PD TOPR TSTG TLEAD Value 40 40 500 50 5 1000 0 ~ +70 -65 ~ +150 +300 Unit V V mA mA mA m/W °C °C °C Electrical Characteristics (VCC = 20V, TA = 0 to +70°C, unless otherwise specified) Parameter REFERENCE SECTION Reference Output Voltage Line Regulation Load Regulation Short Circuit Output Current Total Output Variation (Note1) Temperature Stability (Note1) Long Term Stability (Note1) OSCILLATOR SECTION Initial Accuracy (Note1, 2) Frequency Change With Voltage Maximum Frequency Minimum Frequency Clock Amplitude (Note1, 2) Clock Width (Note1, 2) Sync Threshold Sync Input Current Symbol Conditions VREF ∆VREF ∆VREF ISC ∆VREF STT ST TJ = 25°C VCC = 8 to 35V IREF = 0 to 20mA VREF = 0, TJ = 25°C Line, Load and Temperature TJ = 125°C ,1KHRS ACCUR ∆f/∆VCC f(MAX) f(MIN) V(CLK) tW(CLK) VTH(SYNC) II(SYNC) TJ = 25°C VCC = 8 to 35V (Note1, 2) RT = 2kΩ, CT = 470pF RT = 200kΩ, CT = 0.1uF TJ = 25°C Sync = 3.5V Min. Typ. Max. Unit 5.0 5.1 5.2 V - 9 20 mV - 20 50 mV - 80 100 mA 4.95 - 5.25 V - 20 50 mV - 20 50 mV - ±3 ±6 - ±0.8 ±2 400 430 - 60 120 34 0.3 0.6 1 1.2 2 2.8 - 1.3 2.5 % % kHz Hz V µs V mA 2 KA3525A Electrical Characteristics (Continued) (VCC = 20V, TA = 0 to +70°C, unless otherwise specified) Parameter Symbol ERROR AMPLIFIER SECTION (VCM = 5.1V) Input Offset Voltage VIO Input Bias Current IBIAS Input Offset Current IIO Open Loop Voltage Gain GVO Common Mode Rejection Ratio CMRR Power Supply Rejection Ratio PSRR PWM COMPARATOR SECTION Minimum Duty Cycle D(MIN) Maximum Duty Cycle D(MAX) Input Threshold Voltage (Note2) VTH1 Input Threshold Voltage (Note2) VTH2 SOFT-START SECTION Soft Start Current ISOFT Soft Start Low Level Voltage VSL Shutdown Threshold Voltage VTH(SD) Shutdown Input Current IN(SD) OUTPUT SECTION Low Output Voltage I VOL I Low Output Voltage II VOL II High Output Voltage I VCH I High Output Voltage II VCH II Under Voltage Lockout VUV Collector Leakage Current ILKG Rise Time (Note1) tR Fall Time (Note1) tF STANDBY CURRENT Supply Current ICC Conditions RL ≥ 10MΩ VCM = 1.5 to 5.2V VCC = 8 to 3.5V Zero Duty Cycle Max Duty Cycle VSD = 0V, VSS = 0V VSD = 25V VSD = 2.5V ISINK = 20mA ISINK = 100mA ISOURCE = 20mA ISOURCE = 100mA V8 and V9 = High VCC = 35V CL = 1uF, TJ = 25°C CL = 1uF, TJ = 25°C VCC = 35V Min. Typ. Max. Unit - 1.5 10 mV - 1 10 µA - 0.1 1 µA 60 80 - dB 60 90 - dB 50 60 - dB - -0 45 49 0.7 0.9 - 3.2 3.6 % % V V 25 51 80 µA - 0.3 0.7 V 0.9 1.3 1.7 V - 0.3 1 mA - 0.1 0.4 V - 0.05 2 V 18 19 - V 17 18 - V 678V - 80 200 µA - 80 600 ns - 70 300 ns - 12 20 mA Note : 1. These parameters. although guaranteed over the recommended operating conditions, are not 100% tested in production 2. Tested at fOSC=40kHz (RT =3.6K, CT =0.01uF, RI = 0Ω) 3 KA3525A Test Circuit 16 3k RWM ADJ 10k Vcc 0.1 15 12 BAND GAP REF 5V U.V.L.O. 1.5K _ 1 ERR AMP 2+ 10K 0.01 SOFT START + 8 5.0uF 10 9 5.0k _ ERR AMP + LATCH S SR OSCILLATOR 36 CLOCK F/F VREF 5.0k SHUTDOWN 5.0k 5 CT RAMP 7 100 DEAD TIME RT 0.009 0.001 + 0.1 3.6k A B 13 VC 0.1 OUT A 11 10k 10k 14 OUT B 4 Mechanical Dimensions Package 6.40 ±0.20 0.252 ±0.008 #1 #16 16-DIP ( 0.81 ) 0.032 KA3525A 0.46 ±0.10 0.018 ±0.004 1.50 ±0.10 0.059 ±0.004 19.40 ±0.20 0.764 ±0.008 MAX 19.80 0.780 2.54 0.100 #8 7.62 0.300 #9 3.25 ±0.20 0.128 ±0.008 5.08 0.200 MAX 0~15° 0.25 +0.10 –0.05 0.010 +0.004 –0.002 0.38 0.014 MIN 3.30 ±0.30 0.130 ±0.012 5 KA3525A Ordering Information Product Number KA3525A Package 16-DIP Operating Temperature 0 ~ +70°C 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 APPLICATI.


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