UNISONIC TECHNOLOGIES CO., LTD
TL494
VOLTAGE MODE PWM
CONTROL CIRCUIT
DESCRIPTION
LINEAR INTEGRATED CIRCUIT
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
DIP-16
SOP-16
TSSOP-16
Packing
Tube
Tape Reel
Tape Reel
MARKING
DIP-16
SOP-16 / TSSOP-16
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QW-R103-004. J
TL494
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
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
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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TL494
PARAMETER
Supply Voltage(Note 3)
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current
Power Dissipation (T
A
=25C)
Derate at T
A
＞25C
SYMBOL
V
CC
V
IN
V
OUT
I
CO
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(unless otherwise specified)
RATINGS
UNIT
41
V
V
CC
+0.3
V
41
V
250
mA
1000
mW
P
D
9.2
mW/C
Junction Temperature
T
J
125
C
Operating Temperature
T
OPR
-25 ~ +85
C
Storage Temperature
T
STG
-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
SYMBOL
V
CC
V
IN
V
OUT
I
C
I
f
C
T
R
T
f
OSC
T
A
MIN
7
-0.3
TYP
MAX
40
V
CC
-2
40
200
0.3
10000
500
300
70
UNIT
V
V
V
mA
mA
nF
kΩ
kHz
C
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
0.47
1.8
1
0
ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range, V
CC
=15V, f=1kHz, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
REFERENCE SECTION
Output Voltage
V
OUT
I
OUT
=1mA
4.75
5
5.25
V
Input Regulation
V
IN
V
CC
=7V ~ 40V
2
25
mV
Output Regulation
V
OUT
I
OUT
=1 ~ 10mA
1
15
mV
Output Voltage Change with Temperature
T
A
=MIN ~ MAX(note 2)
0.2
1
%
Short-Circuit Output Current
I
O(SC)
V
REF
=0
35
mA
OSCILLATOR SECTION
Frequency
F
C
T
=0.01μF, R
T
=12kΩ
10
kHz
All Values of V
CC
C
T
, R
T
, T
A
Standard Deviation of Frequency
10
%
constant
Frequency Change with Voltage
V
CC
=7V ~ 40V,Ta=25C
0.1
%
C
T
=0.01μF, R
T
=12kΩ,
12
%
Frequency Change with Temperature
T
A
=MIN ~ MAX
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TL494
ELECTRICAL CHARACTERISTICS(Cont.)
SYMBOL
Error
V
I(OFF)
I
I(OFF)
I
I(BIAS)
PARAMETER
AMPLIFIER SECTION
Input Offset Voltage
Input Offset Current
Input Bias Current
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
V
OUT
(pin 3)=2.5V
V
OUT
(pin 3)=2.5V
V
OUT
(pin 3)=2.5V
V
CC
=7V ~ 40 V
V
OUT
=3V, V
OUT
=0.5V ~ 3.5V
V
CC
=40V,T
A
=25C
V
ID
=-15mV ~ -5V, V(pin 3)=0.5V
V
ID
=15mV ~ -5V, V(pin 3)=3.5V
V
CE
=40V, V
CC
=40V
V
CC
=V
C
=40V, V
E
=0
V
E
=0, I
C
=200mA
V
C
=15V, I
E
=-200mA
V
IN
=V
REF
V
IN
=0 ~ 5.25V
V
IN
(pin 4)=0
Zero duty Cycle
Maximum duty cycle
Zero Duty cycle
V(pin 3)= 0.7V
pin 6 at V
REF
, all other Inputs and
outputs open
MIN
TYP
2
25
0.2
MAX UNIT
10
250
1
mV
nA
μA
V
Common-Mode Input Voltage Range Error
Open-Loop Voltage Amplification
Unity-Gain Bandwidth
GB
W
Common-Mode Rejection Ratio
Error
CMRR
Output Sink Current(pin 3)
I
O(SINK)
Output source Current(pin 3)
I
O(SOURCE)
OUTPUT SECTION
Collector off-state current
I
C(OFF)
Emitter off-state Current
I
E(OFF)
Collector -emitter
Common-emitter
Saturation Voltage
Emitter-Follower
Output Control Input Current
DEAD TIME CONTROL SECTION
Input bias (pin 4)
I
I(BIAS)
Maximum duty cycle, each output
Input threshold Voltage(pin 4)
V
THR
PWM COMPARATOR SECTION
Input Threshold Voltage(pin 3)
Input Sink Current (pin 3)
TOTAL DEVICE
Standby Supply Current
V
CC
=15V
V
CC
=40V
-0.3 ~
V
CC
-2
70
65
0.3
-2
95
800
80
0.7
dB
kHz
dB
mA
mA
100
-100
1.3
2.5
3.5
-10
3.3
μA
μA
V
mA
μA
%
V
2
1.1
1.5
-2
45
3
0
4
0.7
6
9
7.5
V
THR
I
I(SINK)
I
ST-BY
4.5
0.3
V
mA
mA
10
15
Average supply current
V(pin 4)=2V
mA
SWITCHING CHARACTERISTICS, TA=25C
Output Voltage Rise Time
t
R
100 200
ns
Common-emitter configuration
Output Voltage Fall Time
t
F
25
100
ns
Output Voltage Rise Time
t
R
100 200
ns
Emitter-follower configuration
Output Voltage Fall Time
t
F
40
100
ns
Notes: 1. All typical Values except for temperature coefficient are at T
A
=25C.
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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