Maker : Motorola Inc
Part No. : TL494CN

  Datasheet PDF : TL494CN.pdf
  Cross Reference : TL494CN Cross Reference
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Product Information

Order this document by TL494/D TL494 SWITCHMODE™ Pulse Width Modulation Control Circuit The TL494 is a fixed frequency, pulse width modulation control circuit designed primarily for SWITCHMODE power supply control. • • • • • • • • SWITCHMODE PULSE WIDTH MODULATION CONTROL CIRCUIT SEMICONDUCTOR TECHNICAL DATA 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 D SUFFIX PLASTIC PACKAGE CASE 751B (SO–16) N SUFFIX PLASTIC PACKAGE CASE 648 PIN CONNECTIONS Noninv Input 1 Inv Input 2 Noninv 16 Input Inv 15 Input 14 Vref Output 13 Control 12 VCC Oscillator MAXIMUM RATINGS (Full operating ambient temperature range applies, unless otherwise noted.) Rating Power Supply Voltage Collector Output Voltage Collector Output Current (Each transistor) (Note 1) Amplifier Input Voltage Range Power Dissipation @ TA ≤ 45°C Thermal Resistance, Junction–to–Ambient Operating Junction Temperature Storage Temperature Range Operating Ambient Temperature Range TL494C TL494I Derating Ambient Temperature NOTE: + Error 1 Amp – + 2 Error Amp – VCC 5.0 V REF Symbol VCC VC1, VC2 IC1, IC2 VIR PD RθJA TJ Tstg TA TL494C 42 42 500 TL494I Unit V V mA V mW °C/W °C °C °C Compen/PWN Comp Input 3 Deadtime Control 4 CT 5 RT 6 ≈ 0.1 V 11 C2 Q2 Ground 7 10 E2 Q1 –0.3 to +42 1000 80 125 –55 to +125 0 to +70 – 25 to +85 C1 8 9 E1 (Top View) ORDERING INFORMATION Device Operating Temperature Range TA = 0° to +70°C TA = – 25° to +85°C Package SO–16 Plastic Plastic Rev 1 TA 45 °C TL494CD TL494CN TL494IN 1. Maximum thermal limits must be observed. © Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA 1 TL494 RECOMMENDED OPERATING CONDITIONS Characteristics Power Supply Voltage Collector Output Voltage Collector Output Current (Each transistor) Amplified Input Voltage Current Into Feedback Terminal Reference Output Current Timing Resistor Timing Capacitor Oscillator Frequency Symbol VCC VC1, VC2 IC1, IC2 Vin lfb lref RT CT fosc Min 7.0 – – –0.3 – – 1.8 0.0047 1.0 Typ 15 30 – – – – 30 0.001 40 Max 40 40 200 VCC – 2.0 0.3 10 500 10 200 Unit V V mA V mA mA kΩ µF kHz ELECTRICAL CHARACTERISTICS (VCC = 15 V, CT = 0.01 µF, RT = 12 kΩ, unless otherwise noted.) For typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies, unless otherwise noted. Characteristics REFERENCE SECTION Reference Voltage (IO = 1.0 mA) Line Regulation (VCC = 7.0 V to 40 V) Load Regulation (IO = 1.0 mA to 10 mA) Short Circuit Output Current (Vref = 0 V) OUTPUT SECTION Collector Off–State Current (VCC = 40 V, VCE = 40 V) Emitter Off–State Current VCC = 40 V, VC = 40 V, VE = 0 V) Collector–Emitter Saturation Voltage (Note 2) Common–Emitter (VE = 0 V, IC = 200 mA) Emitter–Follower (VC = 15 V, IE = –200 mA) Output Control Pin Current Low State (VOC ≤ 0.4 V) High State (VOC = Vref) Output Voltage Rise Time Common–Emitter (See Figure 12) Emitter–Follower (See Figure 13) Output Voltage Fall Time Common–Emitter (See Figure 12) Emitter–Follower (See Figure 13) IC(off) IE(off) – – 2.0 – 100 –100 µA µA V Vsat(C) Vsat(E) IOCL IOCH tr – – tf – – 25 40 100 100 100 100 200 200 ns – – – – 1.1 1.5 10 0.2 1.3 2.5 – 3.5 µA mA ns Vref Regline Regload ISC 4.75 – – 15 5.0 2.0 3.0 35 5.25 25 15 75 V mV mV mA Symbol Min Typ Max Unit NOTE: 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. 2 MOTOROLA ANALOG IC DEVICE DATA TL494 ELECTRICAL CHARACTERISTICS (VCC = 15 V, CT = 0.01 µF, RT = 12 kΩ, unless otherwise noted.) For typical values TA = 25°C, for min/max values TA is t...

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