Datasheet

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
Ordering Number
Lead Free
TL494L-D16-T
-

Halogen Free
TL494G-D16-T
TL494G-S16-R
TL494G-P16-R
Package
Packing
DIP-16
SOP-16
TSSOP-16
Tube
Tape Reel
Tape Reel
MARKING
DIP-16
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SOP-16 / TSSOP-16
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TL494
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
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
PIN DESCRIPTION
PIN No.
1, 16
2, 15
3
4
5
6
7
8
9
10
11
12
13
14
SYMBAL
NONINV INPUT
INV INPUT
FEEDBACK
DEAD-TIME CONTROL
CT
RT
GND
C1
E1
E2
C2
VCC
OUTPUT CONTROL
VREF
NAME AND FUNCTION
Error Amplifier NONINV Input
Error Amplifier INV Input
Output Feedback Voltage
Output DEAD-TIME Control
Timing Capacitor
Timing Resistor
Ground
Internal Power NPN Collect1
Internal Power NPN Emitter1
Internal Power NPN Emitter2
Internal Power NPN Collect2
Supply Voltage
Output mode select
Reference Voltage
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TL494
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LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (unless otherwise specified)
PARAMETER
Supply Voltage(Note 3)
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current
Power Dissipation (TA=25C)
Derate at TA>25C
RATINGS
UNIT
41
V
VCC+0.3
V
41
V
250
mA
1000
mW
PD
9.2
mW/C
Junction Temperature
TJ
125
C
Operating Temperature
TOPR
-25 ~ +85
C
Storage Temperature
TSTG
-40 ~ +150
C
Notes: 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
PARAMETER
Supply Voltage
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current (each Transistor)
Current into Feedback
Timing Capacitor
Timing Resistor
Oscillator Frequency
Operating Free-Air Temperature

SYMBOL
VCC
VIN
VOUT
ICO
SYMBOL
VCC
VIN
VOUT
IC
If
CT
RT
fOSC
TA
MIN
7
-0.3
0.47
1.8
1
0
TYP
MAX
40
VCC-2
40
200
0.3
10000
500
300
70
UNIT
V
V
V
mA
mA
nF
kΩ
kHz
C
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
VOUT
IOUT=1mA
4.75
5
5.25
V
Input Regulation
VIN
VCC=7V ~ 40V
2
25
mV
Output Regulation
VOUT
IOUT=1 ~ 10mA
1
15
mV
Output Voltage Change with Temperature
TA=MIN ~ MAX(note 2)
0.2
1
%
Short-Circuit Output Current
IO(SC)
VREF=0
35
mA
OSCILLATOR SECTION
Frequency
F
CT=0.01μF, RT=12kΩ
10
kHz
All Values of VCC CT, RT, TA
Standard Deviation of Frequency
10
%
constant
Frequency Change with Voltage
VCC=7V ~ 40V,Ta=25C
0.1
%
CT=0.01μF, RT=12kΩ,
12
%
Frequency Change with Temperature
TA=MIN ~ MAX
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LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
AMPLIFIER SECTION
Input Offset Voltage
Input Offset Current
Input Bias Current
SYMBOL
Error
VI(OFF)
II(OFF)
II(BIAS)
TEST CONDITIONS
VOUT (pin 3)=2.5V
VOUT (pin 3)=2.5V
VOUT (pin 3)=2.5V
Common-Mode Input Voltage Range Error
VCC=7V ~ 40 V
Open-Loop Voltage Amplification
Unity-Gain Bandwidth
GBW
Common-Mode Rejection Ratio
Error
CMRR
Output Sink Current(pin 3)
IO(SINK)
Output source Current(pin 3)
IO(SOURCE)
OUTPUT SECTION
Collector off-state current
IC(OFF)
Emitter off-state Current
IE(OFF)
Collector -emitter
Common-emitter
Saturation Voltage
Emitter-Follower
Output Control Input Current
DEAD TIME CONTROL SECTION
Input bias (pin 4)
II(BIAS)
Maximum duty cycle, each output
Input threshold Voltage(pin 4)
VTHR
VOUT=3V, VOUT=0.5V ~ 3.5V
PWM COMPARATOR SECTION
Input Threshold Voltage(pin 3)
Input Sink Current (pin 3)
TOTAL DEVICE
Standby Supply Current
VCC =15V
VCC =40V
MIN
VCC=40V,TA=25C
VID=-15mV ~ -5V, V(pin 3)=0.5V
VID=15mV ~ -5V, V(pin 3)=3.5V
-0.3 ~
VCC-2
70
65
0.3
-2
VCE=40V, VCC=40V
VCC=VC=40V, VE=0
VE=0, IC=200mA
VC=15V, IE=-200mA
VIN=VREF
VIN=0 ~ 5.25V
VIN(pin 4)=0
Zero duty Cycle
Maximum duty cycle
VTHR
II(SINK)
Zero Duty cycle
V(pin 3)= 0.7V
IST-BY
pin 6 at VREF, all other Inputs and
outputs open
TYP
MAX UNIT
2
25
0.2
10
250
1
mV
nA
μA
V
95
800
80
0.7
2
1.1
1.5
dB
kHz
dB
mA
mA
100
-100
1.3
2.5
3.5
μA
μA
V
mA
-2
-10
3
3.3
4
0.7
4.5
V
mA
6
9
7.5
10
15
mA
45
μA
%
V
0
0.3
Average supply current
V(pin 4)=2V
mA
SWITCHING CHARACTERISTICS, TA=25C
Output Voltage Rise Time
tR
100 200
ns
Common-emitter configuration
Output Voltage Fall Time
tF
25
100
ns
Output Voltage Rise Time
tR
100 200
ns
Emitter-follower configuration
Output Voltage Fall Time
tF
40
100
ns
Notes: 1. All typical Values except for temperature coefficient are at TA=25C.
2. For conditions shown as MIN or MAX, use appropriate value under recommended operating conditions.
3. Duration of the short-circuit should not exceed one second.
4. Standard deviation is a measure of the statistical distribution the mean as derived from the formula:
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LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
Vcc=15V
2W 150
12
TEST
INPUTS
12k
0.01 F
4
DEAD-TIME
3
FEEDBACK
6
RT
5
CT
Vcc
1
2W 150
C1
8
E1
9
C2
11
E2
10
OUTPUT 1
OUTPUT 2
2
16
ERROR AMPLIFIER
15
13
50k
OUTPUT CONTROL
GND
7
VREF OUTPUT 14
VOLTAGE at C1
VOLTAGE at C2
VOLTAGE at CT
DEAD-TIME
CONTROL INPUT
THRESHOLD VOLTAGE
THRESHOLD VOLTAGE
FEEDBACK
FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS
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LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT(Cont.)
1
Vin
2
ERROR
AMPLIFIER
FEEDBACK
TERMINAL
16
Vref 15
ERROR
AMPLIFIER
Fig. 2 AMPLIFIER CHARACTERISTICS
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LINEAR INTEGRATED CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
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 parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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