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UC3525A

Fairchild Semiconductor
Part Number UC3525A
Manufacturer Fairchild Semiconductor
Description SMPS Controller
Published Oct 19, 2005
Detailed Description www.fairchildsemi.com UC3525A SMPS Controller Features • • • • • 5V ± 1% Reference Oscillator Sync terminal Internal S...
Datasheet PDF File UC3525A PDF File

UC3525A
UC3525A

Overview
www.
fairchildsemi.
com UC3525A SMPS Controller Features • • • • • 5V ± 1% Reference Oscillator Sync terminal Internal Soft Start Deadtime Control Under-Voltage Lockout Description UC3525A is a monolithic integrated circuit that Included all of the control circuit necessary for a pulse width modulating regulator.
There are a voltage reference, an error amplifier, a pulse width modulator, an oscillator, under-voltage lockout, soft start circuit, and output drivers in the chip.
16-DIP 1 Internal Block Diagram Rev.
5.
0 ©2000 Fairchild Semiconductor International UC3525A 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, 10 sec) 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 = -30°C to + 85°C, unless otherwise specified) Parameter REFERENCE SECTION Reference Output Voltage Line Regulation Load Regulation Short Circuit Output Current Total Output Variation (Note 1) Temperature Stability (Note 1) Long Term Stability (Note 1) OSCILLATOR SECTION Initial Accuracy (Note 1, 2) Frequency Change With Voltage Maximum Frequency Minimum Frequency Clock Amplitude (Note 1, 2) Clock Width (Note 1, 2) Sync Threshold Sync Input Current ACCUR ∆f/∆VCC f(MAX) f(MIN) V(CLK) tW(CLK) VTH(SYNC) II(SYNC) Sync = 3.
5V TJ = 25°C TJ = 25°C VCC = 8 to 35V (Note 1, 2) RT = 2KΩ, CT = 470pF RT = 200KΩ, CT = 0.
1uF 400 3 0.
3 1.
2 ±3 ± 0.
8 430 60 4 0.
6 2 1.
3 ±6 ±2 120 1 2.
8 2.
5 % % KHz Hz V µs V mA 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 ,1 KHRS 5.
0 4.
95 5.
1 9 20 80 20 20 5.
2 20 50 100 5.
25 50 50 V mV mV mA V mV mV Symbol Conditions Min.
Typ.
Max.
Unit 2 UC3525A Electrical ...


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