S494_1

Semiconductor S494 Pulse Width Modulation Description The S494 is a monolithic integrated circuit which includes all the necessary building blocks for the design of pulse width modulate(PWM) switching power supplies, including push-pull, bridge and series configuration. The device can operate at switching frequencies between 1KHz and 300KHz and output voltage up to 40V. The S494 is specified over an operating temperature range of -40℃to85℃. Features • Uncommitted output transistors capable of 200mA source or sink • Internal protection from double pulsing of out-puts with narrow pulse widths or with supply voltages bellows specified limits • Easily synchronized to other circuits • Dead time control comparator • Output control selects single-ended or push-pull operation Ordering Information Type NO. S494 Marking S494 Package Code SOP-16 Outline Dimensions unit : mm PIN Connections 1. Non-INV Input 2. INV Input 3. Feed-Back 4. Dead-Time Control 5. CT 6. RT 7. GND 8. C1 9. E1 10. E2 11. C2 12. Vcc 13 Output Control 14. Ref Out 15. INV-Input 16. Non-INV Input KSI-K003-001 1 S494 Absolute Maximum Ratings Characteristic supply voltage Voltage From Any Pin to Ground (except pin 8 and pin 11) Output Collector Voltage Peak Collector Current Power Dissipation Operating Temperature Storage Temperature Ta=25°C Symbol VCC VIN VC1, VC2 IC1, IC2 PD Topr Tstg Ratings 42 VCC+0.3 42 250 1500 -40 ~ 85 -65 ~ 150 Unit V V V mA mW °C °C Recommended Operating Condition Characteristic supply voltage Voltage on Any Pin Except Pin 8 and 11(Referenced to Ground) Output Voltage Output Collector Current Timing Capacitor Timing Capacitor Timing Resistor Oscillator Frequency Symbol VCC VIN VC1, VC2 IC1, IC2 Ct Ct Rt fOSC Min. 7 -0.3 -0.3 470 1.8 1 Max. 40 VCC+0.3 40 200 10 500 300 Unit V V V mA PF ㎌ ㏀ KHz Electrical Characteristics Reference Section Characteristic Reference Voltage Line Regulation Load Regulation Temperature Coefficient Symbol Vref VLINE VLOAD - Test Condition Iref = 1.0mA 7V < Vcc < 40V Min. Typ. Max. 4.75 5.00 2 1 0.01 5.25 25 15 0.03 Unit V mV mV %/°C 1mA< IREF