Semiconductor Components Industries LLC April Rev
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Niveau: Secondaire, Lycée, Terminale ? Semiconductor Components Industries, LLC, 2002 April, 2002 – Rev. 4 1 Publication Order Number: TL494/D TL494, NCV494 SWITCHMODE? Pulse Width Modulation Control Circuit The TL494 is a fixed frequency, pulse width modulation control circuit designed primarily for SWITCHMODE power supply control. • Complete Pulse Width Modulation Control Circuitry • On–Chip Oscillator with Master or Slave Operation • On–Chip Error Amplifiers • On–Chip 5.0 V Reference • Adjustable Deadtime Control • Uncommitted Output Transistors Rated to 500 mA Source or Sink • Output Control for Push–Pull or Single–Ended Operation • Undervoltage Lockout MAXIMUM RATINGS (Full operating ambient temperature range applies, unless otherwise noted.) Rating Symbol Value Unit Power Supply Voltage VCC 42 V Collector Output Voltage VC1, VC2 42 V Collector Output Current (Each transistor) (Note 1) IC1, IC2 500 mA Amplifier Input Voltage Range VIR –0.3 to +42 V Power Dissipation @ TA ≤ 45°C PD 1000 mW Thermal Resistance, Junction–to–Ambient R JA 80 °C/W Operating Junction Temperature TJ 125 °C Storage Temperature Range Tstg –55 to +125 °C Operating Ambient Temperature Range TL494B TL494C TL494I NCV494B TA –40 to +125 0 to +70 –40 to +85 –40 to +125 °C Derating Ambient Temperature TA 45 °C 1. Maximum thermal limits must be observed. PIN CONNECTIONS C T R T Ground C1 1 Inv Input C2 Q2 E2 E1 1 ≈ 0.1 V Oscillator V CC 5.0 V REF (
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