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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
Lead Free Halogen Free
TL494L-D16-T TL494G-D16-T DIP-16 Tube
Ordering Number
- TL494G-S16-R SOP-16 Tape Reel
- TL494G-P16-R
Package Packing
TSSOP-16 Tape Reel
MARKING
DIP-16 SOP-16 / TSSOP-16
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TL494 LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
PIN DESCRIPTION
PIN No. SYMBAL NAME AND FUNCTION
1, 16 NONINV INPUT Error Amplifier NONINV Input
2, 15 INV INPUT Error Amplifier INV Input
3 FEEDBACK Output Feedback Voltage
4 DEAD-TIME CONTROL Output DEAD-TIME Control
5 CT Timing Capacitor
6 RT Timing Resistor
7 GND Ground
8 C1 Internal Power NPN Collect1
9 E1 Internal Power NPN Emitter1
10 E2 Internal Power NPN Emitter2
11 C2 Internal Power NPN Collect2
12 VCC Supply Voltage
13 OUTPUT CONTROL Output mode select
14 VREF Reference Voltage
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TL494 LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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TL494 LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (unless otherwise specified)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage(Note 3) VCC 41 V
Amplifier Input Voltage VIN V
Collector Output Voltage V
41 V
OUT
Collector Output Current ICO 250 mA
Power Dissipation (TA=25C)
Derate at TA＞25C
PD
Junction Temperature TJ 125 C
Operating Temperature T
Storage Temperature T
-25 ~ +85 C
OPR
-40 ~ +150 C
STG
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 MIN TYP MAX UNIT
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 f
Operating Free-Air Temperature TA 0 70 C
40 V
OUT
1 300 kHz
OSC
+0.3 V
CC
1000 mW
9.2 mW/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 V
OUT
I
OUT
=1mA 4.75 5 5.25 V
Input Regulation VIN VCC=7V ~ 40V 2 25 mV
Output Regulation V
OUT
I
OUT
=1 ~ 10mA 1 15 mV
Output Voltage Change with Temperature TA=MIN ~ MAX(note 2) 0.2 1 %
Short-Circuit Output Current I
O(SC)
V
REF
=0 35 mA
OSCILLATOR SECTION
Frequency F CT=0.01μF, RT=12kΩ 10 kHz
Standard Deviation of Frequency
All Values of V
constant
CC CT
, RT, TA
10 %
Frequency Change with Voltage VCC=7V ~ 40V,Ta=25C 0.1 %
=0.01μF, RT=12kΩ,
C
Frequency Change with Temperature
T
TA=MIN ~ MAX
12 %
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TL494 LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
AMPLIFIER SECTION
Input Offset Voltage Error V
Input Offset Current I
Input Bias Current I
I(OFF)VOUT
V
I(OFF)
V
I(BIAS)
Common-Mode Input Voltage Range Error VCC=7V ~ 40 V
Open-Loop Voltage Amplification V
Unity-Gain Bandwidth GBW 800 kHz
Common-Mode Rejection Ratio Error CMRR VCC=40V,TA=25C 65 80 dB
Output Sink Current(pin 3) I
Output source Current(pin 3) I
O(SINK)VID
O(SOURCE)VID
OUTPUT SECTION
Collector off-state current I
Emitter off-state Current I
C(OFF)VCE
VCC=VC=40V, VE=0 -100 μA
E(OFF)
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
VIN=0 ~ 5.25V -2 -10 μA
I(BIAS)
Maximum duty cycle, each output VIN(pin 4)=0 45 %
Input threshold Voltage(pin 4) V
Zero duty Cycle 3 3.3 V
THR
Maximum duty cycle 0
PWM COMPARATOR SECTION
Input Threshold Voltage(pin 3) V
Input Sink Current (pin 3) I
Zero Duty cycle 4 4.5 V
THR
V(pin 3)= 0.7V 0.3 0.7 mA
I(SINK)
TOTAL DEVICE
Standby Supply Current
VCC =15V 6 10 mA
=40V
V
CC
I
ST-BY
Average supply current V(pin 4)=2V 7.5 mA
SWITCHING CHARACTERISTICS, TA=25C
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
Notes: 1. All typical Values except for temperature coefficient are at TA=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:
(pin 3)=2.5V 2 10 mV
(pin 3)=2.5V 25 250 nA
OUT
(pin 3)=2.5V 0.2 1 μA
OUT
OUT
=3V, V
-0.3 ~
V
CC
=0.5V ~ 3.5V 70 95 dB
OUT
V
-2
=-15mV ~ -5V, V(pin 3)=0.5V 0.3 0.7 mA
=15mV ~ -5V, V(pin 3)=3.5V -2 mA
=40V, VCC=40V 2 100 μA
=15V, IE=-200mA 1.5 2.5
C
3.5 mA
REF
pin 6 at V
outputs open
Common-emitter configuration
Emitter-follower configuration
, all other Inputs and
REF
9 15
25 100 ns
40 100 ns
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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 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 believ ed to be accurate
and reliable and may be changed without notice.
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