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TL494

TL494

  • 厂商:

    HTC(泰进)

  • 封装:

  • 描述:

    TL494 - Pulse-Width-Modulation Control Circuits - HTC Korea TAEJIN Technology Co.

  • 数据手册
  • 价格&库存
TL494 数据手册
Pulse-Width-Modulation Control Circuits FEATURES ● Complete PWM Power Control Circuitry ● Uncommitted Outputs for 200 Ma Sink or Source Current ● Output Control Selects Single-Ended or Push-Pull Operation ● Internal Circuitry Prohibits Double Pulse at Either Output ● Variable Dead-Time Provides Control over Total Range ● Internal Regulator Provides a Stable 5-V Reference Supply,5% ● Circuit Architecture Allows Easy Synchronization Error AMP 1 NONINV INPUT INV INPUT FEEDBACK DEAD-TIME CONTROL CT RT GND C1 TL494 SOP16/DIP16 (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NONINV INPUT INV INPUT REF OUT OUTPUT CONTROL Vcc C2 E2 E1 Error AMP 2 DESCRIPTION The TL494 incorporate on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control, these devices offer the systems engineer the flexibility to tailor ORDERING INFORMATION Device Package the power supply control circuitry to his application. TL494D 16 SOP The TL494 contains an error amplifier, an on-chip adjustable TL494N 18 DIP oscillator, a dead-time control comparator, pulse-steering control flip-flop, a 5-volt, 5% precision regulator, and output-control circuit. The error amplifier exhibits a common-mode voltage range from -0.3 volts to Vcc -2 volts. The dead-time control comparator has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip oscillator may be bypassed by terminating R T (pin 6) to the reference output and providing a sawtooth in put to CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The uncommited output transistors provide either common-emitter or emitter-follower output capability. Each Device provides for push-pull or single-ended output operation, which may be selected through the output-control funct -ion. The architecture of these devices prohibits the possibility of either output being pulsed twice during push -pull operation. Functional Block Diagram RT CT OUTPUT CONTROL OSCILLATOR Q1 C1 E1 DEAD TIME CONTROL 0.1V DEAD-TIME CONTROL COMPARATOR C1 Q2 C2 E2 PWM COMPARATOR ERROR AMPLIFIER PULSE-STEERING FLIP-FLOP NONINVERTING INPUT INVERTING INPUT + 1 - Vcc ERROR AMPLIFIER NONINVERTING INPUT INVERTING INPUT + 2 FEEDBACK REFERENCE Vref GND Mar. 2006-Rev06 HTC 145 Pulse-Width-Modulation Control Circuits Parameter measurement information TL494 Vcc = 15V Vcc DEAD-TIME 150 Ω 2W C1 E1 150 Ω 2W OUTPUT 1 OUTPUT 2 TEST INPUTS FEEDBACK 12KΩ RT CT 0.01uF (+) (-) (+) (-) 50KΩ OUTPUT CONTROL GND ERROR C2 E2 REF OUT TEST CIRCUIT VOLTAGE AT C1 Vcc 0 Vcc VOLTAGE AT C2 0 VOLTAGE AT C T DEAD-TIME CONTROL INPUT 0V THRESHOLD VOLTAGE THRESHOLD VOLTAGE FEEDBACK 0.7 V DUTY CIRCLE 0% MAX 0% Figure 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS Mar. 2006-Rev06 HTC 146 Pulse-Width-Modulation Control Circuits AMPLIFIER UNDER TEST + - TL494 FEEDBACK TERMINAL + Vref - OTHER AMPLIFIER FIGURE 2. AMPLIFIER CHARACTERISTICS 15 V (EACH OUTPUT CIRCUIT) 68 Ω 2W OUTPUT CL =15pF (Includes probe and jig capacitance) t f t r 90% 90% 10% 10% TEST CIRCUIT OUTPUT VOLTAGE WAVEFORM FIGURE 3. COMMON-EMITTER CONFIGURATION 15 V (EACH OUTPUT CIRCUIT) 90% 90% 10% 68 Ω 2W CL =15pF (Includes probe and jig capacitance) TEST CIRCUIT t r 10% t f OUTPUT VOLTAGE WAVEFORM FIGURE 4. EMITTER-FOLLOWER CONFIGURATION Mar. 2006-Rev06 HTC 147 Pulse-Width-Modulation Control Circuits ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE Rating Supply voltage, Vcc Amplifier input voltage Collector output voltage Collector output current Operating free-air temperature range Storage temperature range Lead temperature 1,6 mm from case for 10 seconds Value 41 Vcc +0.3 41 250 0 to 70 -65 to 150 260 TL494 Unit V mA o C RECOMMENDED OPERATING CONDITIONS Parameter Supply voltage, Vcc Amplifier input voltage, Vi Collector output voltage, Vo Collector output current (each transistor) Current into feedback terminal Timing capacitor, C T Timing resistor, R T Oscillator frequency Operating free-air temperature, T A Value MIN 7 -0.3 MAX 40 Vcc -2 40 200 0.3 10000 500 300 70 Unit V mA nF KΩ KHz o 0.47 1.8 1 0 C Electrical characteristics over recommended operatng free-air temperature range, Vcc=15V, f= 10 kHz(unless otherwise noted). Parameter Output voltage (Vref) Input regulation Output regulation Output voltage change with temperature Short-circuit output current*** Test Conditions* lo = 1mA Vcc = 7V to 40 V Io = 1mA to 10mA TA = MIN to MAX Vref = 0 MIN 4.75 Value TYP** 5 2 1 0.2 35 MAX 5.25 25 15 1 Unit V mV % mA Oscillator section (See Figure 1) Parameter Frequency Standard deviation of frequency**** Frequency change with voltage Frequency change with temperature**** Test Conditions* CT=0.01μF, R T=12KΩ All values of Vcc, C T,RT, and TA constant Vcc=7V to 40V, T A=25oC CT=0.01μF, R T=12KΩ, TA = MIN to MAX MIN Value TYP** 10 10 0.1 1 % MAX Unit KHz Mar. 2006-Rev06 HTC 148 Pulse-Width-Modulation Control Circuits Electrical characteristics over recommended operating free-air temperature range, Vcc=15V, f=10kHz (unless otherwise noted) Amplifier section (See Figure 2) SYMBOL Input offset voltage Input offset current Input bias current Common-mode input voltage range Open-loop voltage amplification Unity-gain bandwidth Common-mode rejection ratio Output sink current (pin 3) Output source current (pin 3) TEST CONDITIONS Vo(pin 3)=2.5V Vo(pin 3)=2.5V Vo(pin 3)=2.5V MIN. TL494 TYP**. MAX. UNIT 2 25 0.2 10 250 1 ㎷ nA ㎂ V dB kHz dB mA mA Vcc = 7V to 40V -0.3~-2 Vo=3V, R L=2KΩ, Vo=0.5~3.5V 70 95 Vo=0.5~3.5V, R L=2KΩ 800 Vo= 40V, T A= 25oC VID=-15mV~-5V, V( pin3)=0.7V VID=15mV~5V, V( pin3)=3.5V 65 0.3 -2 80 0.7 *For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. ** All typical values except for parameter changes with temperature are at TA =25 oC *** Duration of the short-circuit should not exceed one second. **** Standard deviation is a measure of the statistical distribution about the mean as derived from the formula. ***** Temperature coefficient of timing capacitor and timing resistor not taken into account. Output section PARAMETER Collector off-state current Emitter off-state current Collector-emitter saturation voltage Common-emitter Emitter-follower Output control input current TEST CONDITIONS VCE=40V, Vcc=40V VCC=VC=40V,V E=0 VE=0, IC=200mA Vc=15V, I E=-200mA VI=Vref MIN. TYP* 2 1.1 1.5 MAX. UNIT 100 ㎂ -100 1.3 V 2.5 3.5 mA Dead-time control-section (See Figure 1) PARAMETER Input bias current(pin4) Maximum duty cycle, each output Input threshold voltage(pin 4) TEST CONDITIONS VI=0 to 5.25V =0, CT=0.1uF, R T=12KΩ VI (pin 4) Zero duty cycle Maximum duty cycle MIN. TYP* -2 45 3 0 MAX. UNIT ㎂ -10 % 3.3 V PMW comparator section (See Figure 1) PARAMETER Input threshold voltage (pin3) Input sink current (pin 3) TEST CONDITIONS Zero duty cycle V(pin3) = 0.7V MIN. 0.3 TYP* 4 0.7 MAX. UNIT 4.5 V mA Total device PARAMETER Standby supply current Average supply current TEST CONDITIONS Pin 6 at Vref, all other inputs and outputs open VI(pin 4)= 2V MIN. VCC=15V VCC=40V TYP* 6 9 7.5 MAX. UNIT 10 mA 15 Mar. 2006-Rev06 HTC 149 Pulse-Width-Modulation Control Circuits Switching characteristics, T PARAMETER Output voltage rise time Output voltage fall time Output voltage rise time Output voltage fall time A TL494 MIN. TYP* 100 25 100 40 MAX. UNIT 200 100 200 100 = 25 oC TEST CONDITIONS Common-emitter configuration Emitter-follower configuration ns * All typical values except for temperature coefficient are at T A = 25oC t osc - R T 500 OPEN-LOOP VOLTAGE GAIN VOL (dB) A 100 90 OSCILLATOR FREQUENCYosc (Hz) t 100 80 70 60 50 40 30 20 10 0 1.0 k 5.0 k 20 k 50 k 200 500 1.0 1.1 10 100 1.0k 10k 100k TIMING RESISTANCE(Ω) TR FREQUENCY f(Hz) Vcc=15V VO=3.0V RL=2.0㏀ 0 EXCESS PHASE (DEGREES) 20 40 60 80 100 120 140 160 180 1.0M 10 k 1.0 k 500 VCE(sat) - I C VCE 1.9 I E SATURATION VOLTAGE CV (sat) (V) E SATURATION VOLTAGE CV (sat) (V) E 100 200 300 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 0 100 200 300 0.4 0 10 9.0 SUPPLY CURRENT Icc (mA) 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 0 5.0 COLLECTOR CURRENT Ic ( ) ICC - V CC EMITTER CURRENT IE (mA) 10 15 20 25 30 35 40 SUPPLY VOLTAGE Vcc (V) Mar. 2006-Rev06 HTC 150
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