Datasheet UTCTL494 Datasheet (UTC)

UTC 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 DC­DC 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 200 mA sink or source current
*Output control selects single ended or push pull operation
*Internal circuitry prohibits double pulses over total range
*Easy synchronization

ABSOLUTE MAXIMUM RATINGS(Unless otherwise noted all is over operating free air temperature

range)

PARAMETER SYMBOL VALUE UNIT

Supply Voltage(note 1) V
Amplifier Input Voltage V
Collector Output Voltage V
Collector Output Current I
Continuous Total Dissipation at(or for below)
25°C Free Air Temperature(note 2)
Operating Temperature Range T
Storage Temperature Range T
Lead Temperature 1.6mm from Case for 60
Sec.

T

P

CC

I

O

CO

D

opr
stg

case

41 V

VCC+0.3 V

41 V

250 mA

1000 mW

0 TO 70 °C

-65 TO 150 °C
300 °C

SOP-16

DIP-16

note 1: All voltage values, except differential voltages are with respect to the network ground terminal.
note 2:For operation above 25°C free-air temperature, the dissipation derates with 9.2mW/°C.

UTC UNISONIC TECHNOLOGIES CO., LTD. 1

QW-R103-004,A

UTC TL494 LINEAR INTEGRATED CIRCUIT

BLOCK DIAGRAM

13

Input

control

Q

T

Q

5V reference

regulation

16
15

Q1

Q2

Vref

Vcc

GND

C1

8

E1

9

11

C2

E2

10

14

12

7

6
5

4

dead time

control

1
2

Pulse Steering

RT
CT

oscillator

dead time comparator

0.7mA

Error

Amplifier

3

Flip-Flop

PWM comparator

Error

Amplifier

RECOMMENDED OPERATING CONDITIONS

PARAMETER SYMBOL VALUE UNIT

MIN MAX

Supply Voltage Vcc 7 40 V
Amplifier Input Voltage Vi -0.3 Vcc-2 V
Collector Output Voltage Vo 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

ELECTRICAL CHARACTERISTICS

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

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Reference Section

Output Voltage Io=1mA 4.75 5 5.25 V
Input Regulation Vcc=7V to 40V 2 25 mV
Output Regulation Io=1 to 10mA 1 15 mV
Output Voltage Change with

∆TA=MIN to MAX(note 2) 0.2 1 %
Temperature
Short-Circuit Output Current Vref=0 35 mA

Oscillator Section

Frequency CT=0.01µF,RT=120kΩ 10 kHz

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UTC TL494 LINEAR INTEGRATED CIRCUIT

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

Standard Deviation of Frequency All Values of Vcc CT, RT, TA

Frequency Change with Voltage Vcc=7v to 40V,Ta=25°C 0.1 %
Frequency Change with
Temperature

Amplifier Section

Input Offset Voltage Error Vo(pin 3)=2.5V 2 10 mV
Input Offset Current Vo(pin 3)=2.5V 25 250 nA
Input Bias Current Vo(pin 3)=2.5V 0.2 1 µA
Common-Mode Input Voltage
Range
Open-Loop Voltage Amplification ∆Vo=3V, Vo=0.5V to 3.5V 70 95 dB
Unity-Gain Bandwidth 800 kHz
Common-Mode Rejection Ratio Error Vcc=40V,TA=25°C 65 80 dB
Output Sink Current(pin 3) VID=-15mV to -5V

Output source Current(pin 3) VID=15mV to -5V V(pin 3)=3.5V -2 mA

Output Section

Collector off-state current VCE=40V,Vcc=40V 2 100 µA
Emitter off-state Current VCC=VC=40V,VE=0 -100 µA
Collector -emitter Saturation
Voltage

Output Control Input Current Vi=Vref 3.5 mA

Dead Time Control Section

Input bias (pin 4) Vi=0 to 5.25V -2 -10 µA
Maximum duty cycle, each output VI(pin 40=0 45 %
Input threshold Voltage(pin 4) Zero duty Cycle 3 3.3 V

PWM comparator Section

Input Threshold Voltage(pin 3) Zero Duty cycle 4 4.5 V
Input Sink Current (pin 3) Vpin 3= 0.7V 0.3 0.7 mA

Total Device

Standby Supply Current Vcc=15V pin 6 at Vref,all other Inputs and

Average supply current Vpin 4=2V 7.5 mA

Switching Characteristics,Ta=25°C

Output Voltage Rise Time Common-emitter configuration 100 200 ns
Output Voltage Fall Time 25 100 ns
Output Voltage Rise Time Emitter-follower configuration 100 200 ns
Output Voltage Fall Time 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 recommended operating conditions.
note 3:Duration of the short-circuit should not exceed one second.

Error Vcc=7V to 40 V -0.3 to

Common-

emitter

Emitter-

Follower

Vcc=40V 9 15

CT=0.01µF,RT=12kΩ,∆TA=MIN

constant

to MAX

Vcc-2

V(pin 3)=0.5V

VE=0,Ic=200mA 1.1 1.3 V

Vc=15V,IE=-200mA 1.5 2.5

Maximum duty cycle 0

outputs open 6

10 %

12 %

V

0.3 0.7 mA

10 mA

UTC UNISONIC TECHNOLOGIES CO., LTD. 3

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UTC TL494 LINEAR INTEGRATED CIRCUIT

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

N

Σ

=

n=1

σ

N-1

TEST CIRCUIT

VOLTAGE

at C1

VOLTAGE

at C2

(xn-x)

TEST

INPUTS

50kΩ

2

Vcc=15V

2W 150 Ω 2W 150 Ω

8

C1

9

E1

11

C2

10

E2

Vref

OUTPUT

14

OUTPUT 1

OUTPUT 2

12kΩ

0.01 µF

4

DEAD-TIME

3

FEEDBACK

6

RT

5

CT

1
2

ERROR AMPLIFIER

16
15
13

OUTPUT CONTROL

12

Vcc

GND

7

VOLTAGE

at CT

DEAD-TIME

CONTROL INPUT

FEEDBACK

THRESHOLD VOLTAGE

THRESHOLD VOLTAGE

FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS

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UTC TL494 LINEAR INTEGRATED CIRCUIT

ERROR

AMPLIFIER

1

Vin

2

16

Vref

15

FIG 2. AMPLIFIER CHARACTERISTICS

FEEDBACK

TERMINAL

ERROR

AMPLIFIER

EACH
OUTPUT
CIRCUIT

Vcc

68Ω

Q

15pF

90%

10%

tr tf

90%

Vc

10%

EACH
OUTPUT
CIRCUIT

Vcc

10%

90%

tr

Q

Ω

15pF68

tf

90%

10%

FIG. 3 COMMON-EMITTER CONFIGURATION FIG. 4 EMITTER -FOLLOWER CONFIGURATION

PIN CONFIGURATIONS

NONINV

1

INPUT

INV INPUT

2

3

FEEDBACK

DEAD-TIME

CONTROL

4

5

CT

6

RT

7

GND

C1 E1

8 9

16

15

14

13

12

11

10

NONINV

INPUT

INV INPUT

Vref

OUTPUT

CONTROL

Vcc

C2

E2

Ve

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QW-R103-004,A

UTC TL494 LINEAR INTEGRATED CIRCUIT

TYPICAL PERFORMANCE CHARACTERISTICS

5

10

4

10

3

10

2

10

Oscillator Frequency (Hz)

1

10

3

1010

RT(Timing Resistance) ( Ω )

4

CT=1 µF

Vcc=15V
Ta=0~70¢XC

CT=0.01 µF

CT=0.1 µF

5

10

CT=0.001 µF

6

10

FIG 5. Oscillator Frequency and Frequency Variation Fig.6 Amplifier Voltage Amplification
Vs
Timing Resistance

100

80

60

40

20

Voltage Amplification (dB)

0

10

32

4

1010

Frequency (Hz)

5

10

Vcc=15V

∆

V=3V

Ta=25¢XC

6

10

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