Datasheet TL494 Datasheet (UNISONIC TECHNOLOGIES CO)

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UNISONIC TECHNOLOGIES CO., LTD

TL494

LINEAR INTEGRATED CIRCUIT

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

 ORDERING INFORMATION

SOP-16

DIP-16

*Pb-free plating product number: TL494L

Order Number

Normal Lead Free Plating
TL494-D16-T TL494L-D16-T DIP-16 Tube
TL494-S16-R TL494L-S16-R SOP-16 Tape Reel
TL494-S16-T TL494L-S16-T SOP-16 Tube

TL494L-D16-T

(1)Packing Type
(2)Package Type
(3)Lead Plating

Package Packing

(1) R: Tape Reel, T: Tube
(2) D16: DIP-16, S16: SOP-16
(3) L: Lead Free Plating, Blank: Pb/Sn

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Copyright © 2005 Unisonic Technologies Co., Ltd QW-R103-004,D

TL494 LINEAR INTEGRATED CIRCUIT

 PIN CONFIGURATIONS

 BLOCK DIAGRAM

RT

6

CT

5

dead time comparator

4

dead time

control

0.7mA

1
2

Error

Amplifier

oscillator

Pulse Steering

Flip-Flop

PWM comparator

Error

Amplifier

16
15

13

Input

control

C1

8

Q

T

Q

5V reference

regulation

Q1

Q2

V

Vcc

GND

REF

11

10

14

12

E1

9

C2

E2

7

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TL494 LINEAR INTEGRATED CIRCUIT

 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
Collector Output Voltage V
Collector Output Current ICO 250 mA

Continuous Total Dissipation
Junction Temperature TJ 125 °C

Operating Temperature T
Storage Temperature T
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.

Ta=25°C 1000 mW
Derate at Ta＞25°C

41 V

OUT

PD

-25 ~ +85 °C

OPR

-40 ~ +150 °C

STG

 RECOMMENDED OPERATING CONDITIONS

+0.3 V

CC

9.2 mW/°C

PARAMETER SYMBOL
Supply Voltage VCC 7 40 V

Amplifier Input Voltage VIN -0.3 Vcc-2 V
Collector Output Voltage 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

40 V

OUT

RATINGS

MIN MAX

UNIT

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TL494 LINEAR INTEGRATED CIRCUIT

 ELECTRICAL CHARACTERISTICS

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

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Reference Section
Output Voltage V
Input Regulation VIN VCC=7V ~ 40V 2 25 mV
Output Regulation V
Output Voltage Change with Temperature
Short-Circuit Output Current I
Oscillator Section
Frequency F

Standard Deviation of Frequency
Frequency Change with Voltage
Frequency Change with Temperature
Amplifier Section

Input Offset Voltage Error V
Input Offset Current I
Input Bias Current I

Common-Mode Input Voltage Range Error VCC=7V ~ 40 V
Open-Loop Voltage Amplification

Unity-Gain Bandwidth GBW 800 kHz
Common-Mode Rejection Ratio Error CMRR

Output Sink Current(pin 3) I
Output source Current(pin 3) I

Output Section
Collector off-state current I
Emitter off-state Current I

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

Saturation Voltage

Emitter-Follower V
Output Control Input Current VIN=V
Dead Time Control Section
Input bias (pin 4) I
Maximum duty cycle, each output VIN(pin 40=0 45 %
Input threshold Voltage(pin 4) V
Maximum duty cycle 0
PWM comparator Section
Input Threshold Voltage(pin 3) V
Input Sink Current (pin 3) I
Total Device

Standby Supply Current

VCC =15V

=40V

V

CC

Average supply current Vpin 4=2V 7.5 mA
Switching Characteristics, Ta=25°C
Output Voltage Rise Time tR 100 200 ns
Output Voltage Fall Time tF
Output Voltage Rise Time tR 100 200 ns
Output Voltage Fall Time tF

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 recommended operating conditions.
Note 3:Duration of the short-circuit should not exceed one second.
Note 4:Standard deviation is a measure of the statistical distribution the mean as derived from the formula:

I

OUT

OUT

O(SC)

I(OFF)VOUT

I(OFF)

I(BIAS)

O(SINK)

O(SOURCE)VID

C(OFF)
E(OFF)

=1mA 4.75 5 5.25 V

OUT

I

=1 ~ 10mA 1 15 mV

OUT

ΔTa=MIN ~ MAX(note 2)

V

=0 35 mA

REF

=0.01μF, RT=120kΩ

C

T

All Values of VCC CT, RT, TA
constant

=7v ~ 40V,Ta=25°C

V

CC

=0.01μF, RT=12kΩ, ΔTa=MIN

C

T

~ MAX

0.2 1 %

10 kHz
10 %

0.1 %
12 %

(pin 3)=2.5V 2 10 mV

V

(pin 3)=2.5V 25 250 nA

OUT

V

(pin 3)=2.5V

OUT

=3V, V

ΔV

OUT

=40V,TA=25°C

V

CC

VID=-15mV ~ -5V

=0.5V ~ 3.5V

OUT

0.2 1

-0.3 ~
Vcc-2

70 95 dB

65 80 dB

0.3 0.7 mA

V(pin 3)=0.5V

=15mV ~ -5V, V(pin 3)=3.5V -2 mA

VCE=40V, VCC=40V
VCC=VC=40V, VE=0

=15V, IE=-200mA 1.5 2.5

C

3.5 mA

REF

2 100

-100

VIN=0 ~ 5.25V

I(BIAS)

Zero duty Cycle 3 3.3 V

THR

Zero Duty cycle 4 4.5 V

THR

Vpin 3= 0.7V 0.3 0.7 mA

I(SINK)

I

ST-BY

pin 6 at V
outputs open

, all other Inputs and

REF

Common-emitter configuration

Emitter-follower configuration

-2 -10

6 10 mA
9 15

25 100 ns

40 100 ns

μA

V

μA
μA

μA

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TL494 LINEAR INTEGRATED CIRCUIT

 TEST CIRCUIT

Vcc=15V

VOLTAGE at C1

VOLTAGE at C2

TEST

INPUTS

50k

12k

0.01 F

4

DEAD-TIME

3

FEEDBACK

6

RT

5

CT

1
2

ERROR AMPLIFIER

16
15
13

OUTPUT CONTROL

12

Vcc

GND

7

2W 150 2W 150

REF OUTPUT

V

C1
E1

C2
E2

8
9

11
10

14

OUTPUT 1

OUTPUT 2

VOLTAGE at CT

DEAD-TIME

CONTROL INPUT

FEEDBACK

THRESHOLD VOLTAGE

THRESHOLD VOLTAGE

FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS

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TL494 LINEAR INTEGRATED CIRCUIT

 TEST CIRCUIT(Cont.)

ERROR

1

AMPLIFIER

Vin

2

16

Vref

15

AMPLIFIER

FIG 2. AMPLIFIER CHARACTERISTICS

FEEDBACK

TERMINAL

ERROR

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TL494 LINEAR INTEGRATED CIRCUIT

 TYPICAL PERFORMANCE CHARACTERISTICS

UTC assumes no responsibility for equipment failures that result from using products at v alues that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other paramet ers) listed i n products specif icat ions of any and al l UTC pr oducts described or contai ned
herein. UTC products are not designed f or use in life support appliances, dev ices or systems where
malf uncti on of t hese products can be reasonably expected t o result in personal inj ury. Reproduct ion in
whole or in part is prohi bited without t he prior written consent of the copyri ght owner. The inf ormati on
presented in thi s document does not form part of any quot ation or contract, is bel iev ed to be accurat e
and reliabl e and may be changed without notice.

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