CM494CS datasheet(4/9 Pages) ETC

4 / 9 page

CM494

ADVANCED REGULATING PULSE WIDTH MODULATOR

2000/12/29

Preliminary

Champion Microelectronic Corporation

Page 3

ABSOULTE MAXIMUM RATINGS

Supply voltage, Vcc(Note 2)………………………… 45V

Amplifier input voltages……………………

Vcc + 0.3V

Collector output voltage……………………………

41V

Collector output current…………………………

250mA

Continuous total dissipation……………………

1000mW

@ (or below) 25℃ free air temperature range (Note 3)

Storage temperature range………………-65℃ to + 150℃

Lead temperature 1 / 16"(1.6mm) from case for 60 seconds,

J package…………………………………………300℃

Lead temperature 1 / 16"(1.6mm) from case for 10 seconds,

N package………………………………………

260℃

Note 1: Over operating free air temperature range unless

otherwise noted.

Note 2: All voltage values are with respect to network

ground terminal 3.

Note 3: Consult package section of data book regarding

thermal specification and limitation of package.

RECOMMENDED OPERATING CONDITION

Supply voltage Vcc……………………

7V to 40V

Error amplifier input voltages………-0.3 to Vcc-2V

Collector output voltage……………………… .40V

Collector output current (each transistor)…

200mA

Current into feedback terminal………………..0.3mA

Timing capacitor, CT…

0.47nF to 10,000nF

Timing resistor, RT………………..1.8kΩ to 500kΩ

Oscillator Frequency…………………1kHz to 300kHz

Operating free air temperature

UC494A, UC495A………………-55℃ to + 125℃

UC494AC, UC495AC……………….0℃ to +70℃

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