TL494-D16-T - Unisonic Technologies Co., Ltd.

UNISONIC TECHNOLOGIES CO., LTD

TL494 LINEAR INTEGRATED CIRCUIT

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VOLTAGE MODE PWM

CONTROL CIRCUIT

 DESCRIPTION

The UTC TL494 incorporates all the functions required in the

construction of a pulse-width modulation switching circuit.

Designed primarily for switching power supply control or DC-DC

convectors, it offers the systems engineer the flexibility to tailor

control circuitry to its own application.

 FEATURES

*Complete PWM power control circuitry

*Uncommitted outputs for 200mA sink or source current

*Output control selects single ended or push pull operation

*Internal circuitry prohibits double pulses over total range

*Easy synchronization

Lead Free:TL494L

Halogen Free:TL494G

 ORDERING INFORMATION

Ordering Number

Normal Lead Free Plating Halogen Free Package Packing

TL494-D16-T TL494L-D16-T TL494G-D16-T DIP-16 Tube

TL494-S16-R TL494L-S16-R TL494G-S16-R SOP-16 Tape Reel

TL494 LINEAR INTEGRATED CIRCUIT

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 PIN CONFIGURATION

 BLOCK DIAGRAM

Error

Amplifier

Error

Amplifier

dead time

control

dead time comparator

oscillator

Pulse Steering

Flip-Flop

Input

control

5V reference

regulation

VREF

Vcc

GND

PWM comparator

0.7mA

1

2

4

5

6

7

8

9

10

11

14

13

12

15

16

TQ

Q

Q1

Q2

RT

CT

C1

E1

C2

E2

TL494 LINEAR INTEGRATED CIRCUIT

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 ABSOLUTE MAXIMUM RATINGS

(Unless otherwise noted all is over operating free air temperature range)

PARAMETER SYMBOL RATINGS UNIT

Supply Voltage(Note 3) VCC 41 V

Amplifier Input Voltage VIN V

CC+0.3 V

Collector Output Voltage VOUT 41 V

Collector Output Current ICO 250 mA

Ta=25°C 1000 mW

Continuous Total Dissipation Derate at Ta＞25°CPD 9.2 mW/°C

Junction Temperature TJ 125 °C

Operating Temperature TOPR -25 ~ +85 °C

Storage Temperature TSTG -40 ~ +150 °C

Note 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

2. All voltage values, except differential voltages are with respect to the network ground terminal.

 RECOMMENDED OPERATING CONDITIONS

RATINGS

PARAMETER SYMBOL MIN MAX

UNIT

Supply Voltage VCC 7 40 V

Amplifier Input Voltage VIN -0.3 Vcc-2 V

Collector Output Voltage VOUT 40 V

Collector Output Current(each Transistor) Ic 200 mA

Current into Feedback If 0.3 mA

Timing Capacitor CT 0.47 10000 nF

Timing Resistor RT 1.8 500 kΩ

Oscillator Frequency fosc 1 300 kHz

Operating Free-Air Temperature Ta 0 70 °C

TL494 LINEAR INTEGRATED CIRCUIT

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 ELECTRICAL CHARACTERISTICS

(Over recommended operating free-air temp erature range, VCC=15V, f=1kHz, Unless otherwise specified)

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT

Reference Section

Output Voltage VOUT I

OUT=1mA 4.75 5 5.25 V

Input Regulation VIN V

CC=7V ~ 40V 2 25 mV

Output Regulation VOUT I

OUT=1 ~ 10mA 1 15 mV

Output Voltage Change with Temperature ΔTa=MIN ~ MAX(note 2) 0.2 1 %

Short-Circuit Output Current IO(SC) V

REF=0 35 mA

Oscillator Section

Frequency F CT=0.01μF, RT=12kΩ 10 kHz

Standard Deviation of Frequency All Values of VCC C

T, RT, TA

constant 10 %

Frequency Change with Voltage VCC=7V ~ 40V,Ta=25°C 0.1 %

Frequency Change with Temperature CT=0.01μF, RT=12kΩ,

ΔTa=MIN ~ MAX 12 %

Amplifier Section

Input Offset Voltage Error VI(OFF) VOUT (pin 3)=2.5V 2 10 mV

Input Offset Current II(OFF) V

OUT (pin 3)=2.5V 25 250 nA

Input Bias Current II(BIAS) V

OUT (pin 3)=2.5V 0.2 1 μA

Common-Mode Input Voltage Range Error VCC=7V ~ 40 V -0.3 ~

Vcc-2

V

Open-Loop Voltage Ampl ification ΔVOUT=3V, VOUT=0.5V ~ 3.5V 70 95 dB

Unity-Gain Bandwidth GBW 800 kHz

Common-Mode Rejection Ratio Error CMRR VCC=40V,TA=25°C 65 80 dB

Output Sink Current(pin 3) IO(SINK) VID=-15mV ~ -5V

V(pin 3)=0.5V 0.3 0.7 mA

Output source Current(pin 3) IO(SOURCE) VID=15mV ~ -5V, V(pin 3)=3.5V -2 mA

Output Section

Collector off-state current IC(OFF) V

CE=40V, VCC=40V 2 100 μA

Emitter off-state Current IE(OFF) V

CC=VC=40V, VE=0 -100 μA

Common-emitter VE=0, IC=200mA 1.1 1.3 V Collector -emitter

Saturation Voltage Emitter-Follower VC=15V, IE=-200mA 1.5 2.5

Output Control Input Current VIN=VREF 3.5 mA

Dead Time Control Section

Input bias (pin 4) II(BIAS) V

IN=0 ~ 5.25V -2 -10 μA

Maximum duty cycle, each output VIN(pin 40)=0 45 %

Input threshold Voltage(pin 4) VTHR Zero duty Cycle 3 3.3 V

Maximum duty cycle 0

PWM comparator Section

Input Threshold Voltage(pin 3) VTHR Zero Duty cycle 4 4.5 V

Input Sink Current (pin 3) II(SINK) V(pin 3)= 0.7V 0.3 0.7 mA

Total Device VCC =15V 6 10 mA

Standby Supply Current VCC =40V IST-BY pin 6 at VREF, all other Inputs and

outputs open 9 15

Average supply current V(pin 4)=2V 7.5 mA

Switching Characteristics, T a= 25°C

Output Voltage Rise Time tR 100 200 ns

Output Voltage Fall Time tF Common-emitter configuration 25 100 ns

Output Voltage Rise Time tR 100 200 ns

Output Voltage Fall Time tF Emitter-follower configuration 40 100 ns

Note 1:All typical Values except for temperature coefficient are at Ta=25°C.

Note 2:For conditions shown as MIN or MAX, use appropriate value under recommen ded operating conditions.

Note 3:Duration of the short-circuit should not exceed on e second.

Note 4:Standard deviation is a measure of the statistical distribution the mean as derived from the formula:

TL494 LINEAR INTEGRATED CIRCUIT

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 TEST CIRCUIT

DEAD-TIME

FEEDBACK

RT

CT

ERROR AMPLIFIER

OUTPUT CONTROL

GND

E2

C2

E1

C1

Vcc

TEST

INPUTS

1

2

3

4

5

6

7

8

9

10

11

12

14

15

16

13

Vcc=15V

2W 150 2W 150

OUTPUT 1

OUTPUT 2

VREF OUTPUT

50k

12k

0.01 F

VOLTAGE at C1

DEAD-TIME

CONTROL INPUT

FEEDBACK

VOLTAGE at C2

VOLTAGE at CT

THRESHOLD VOLTAGE

FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS

TL494 LINEAR INTEGRATED CIRCUIT

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 TEST CIRCUIT(Cont.)

Vin

ERROR

AMPLIFIER

1

2

15

16

Vref ERROR

AMPLIFIER

FEEDBACK

TERMINAL

FIG 2. AMPLIFIER CHARACTERISTICS

TL494 LINEAR INTEGRATED CIRCUIT

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 TYPICAL PERFORMA NCE CHAR ACTERISTICS

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other param eters) l isted in products specif icat ions of any and all UTC products described or contai ned

herein. UTC products are not designed for use in life support appliances, devices or systems where

m alfuncti on of these pr oducts can be reasonably expected to result i n personal i njury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this docum ent does not f orm part of any quotat ion or cont ract, i s beli ev ed to be accurate

and rel iabl e and may be c hanged wit hout notice.