UTC-IC TL494_09

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
„
Lead Free:TL494L
Halogen Free:TL494G
ORDERING INFORMATION
Normal
TL494-D16-T
TL494-S16-R
Ordering Number
Lead Free Plating
TL494L-D16-T
TL494L-S16-R
Halogen Free
TL494G-D16-T
TL494G-S16-R
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Copyright © 2009 Unisonic Technologies Co., Ltd
Package
Packing
DIP-16
SOP-16
Tube
Tape Reel
1 of 7
QW-R103-004,F
TL494
LINEAR INTEGRATED CIRCUIT
„
PIN CONFIGURATION
„
BLOCK DIAGRAM
Input
control
Pulse Steering
Flip-Flop
8
9 E1
11 C2
T
oscillator
CT
5
C1
Q1
Q
RT
6
13
Q2
Q
10 E2
dead time comparator
14
VREF
4
dead time
control
5V reference
regulation
PWM comparator
12
Vcc
0.7mA
1
16
2
15
Error
Amplifier
Error
Amplifier
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7
GND
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QW-R103-004,F
TL494
„
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(Unless otherwise noted all is over operating free air temperature range)
PARAMETER
SYMBOL
Supply Voltage(Note 3)
VCC
Amplifier Input Voltage
VIN
Collector Output Voltage
VOUT
Collector Output Current
ICO
Ta=25°C
Continuous Total Dissipation
PD
Derate at Ta>25°C
RATINGS
UNIT
41
V
VCC+0.3
V
41
V
250
mA
1000
mW
9.2
mW/°C
Junction Temperature
TJ
125
°C
Operating Temperature
TOPR
-25 ~ +85
°C
Storage Temperature
TSTG
-40 ~ +150
°C
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.
„
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
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SYMBOL
VCC
VIN
VOUT
Ic
If
CT
RT
fosc
Ta
RATINGS
MIN
7
-0.3
0.47
1.8
1
0
MAX
40
Vcc-2
40
200
0.3
10000
500
300
70
UNIT
V
V
V
mA
mA
nF
kΩ
kHz
°C
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QW-R103-004,F
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
Reference Section
Output Voltage
VOUT IOUT=1mA
4.75
5
5.25
Input Regulation
VIN
VCC=7V ~ 40V
2
25
Output Regulation
VOUT IOUT=1 ~ 10mA
1
15
Output Voltage Change with Temperature
ΔTa=MIN ~ MAX(note 2)
0.2
1
Short-Circuit Output Current
IO(SC) VREF=0
35
Oscillator Section
Frequency
F
CT=0.01μF, RT=12kΩ
10
All Values of VCC CT, RT, TA
10
Standard Deviation of Frequency
constant
Frequency Change with Voltage
VCC=7V ~ 40V,Ta=25°C
0.1
CT=0.01μF, RT=12kΩ,
Frequency Change with Temperature
12
ΔTa=MIN ~ MAX
Amplifier Section
Input Offset Voltage
Error
VI(OFF) VOUT (pin 3)=2.5V
2
10
Input Offset Current
II(OFF) VOUT (pin 3)=2.5V
25
250
Input Bias Current
II(BIAS) VOUT (pin 3)=2.5V
0.2
1
-0.3 ~
Common-Mode Input Voltage Range Error
VCC=7V ~ 40 V
Vcc-2
Open-Loop Voltage Amplification
ΔVOUT=3V, VOUT=0.5V ~ 3.5V
70
95
Unity-Gain Bandwidth
GBW
800
Common-Mode Rejection Ratio
Error
CMRR VCC=40V,TA=25°C
65
80
VID=-15mV ~ -5V
0.3
0.7
Output Sink Current(pin 3)
IO(SINK)
V(pin 3)=0.5V
Output source Current(pin 3)
IO(SOURCE) VID=15mV ~ -5V, V(pin 3)=3.5V
-2
Output Section
Collector off-state current
IC(OFF) VCE=40V, VCC=40V
2
100
Emitter off-state Current
IE(OFF) VCC=VC=40V, VE=0
-100
Collector -emitter
Common-emitter
VE=0, IC=200mA
1.1
1.3
Saturation Voltage
Emitter-Follower
VC=15V, IE=-200mA
1.5
2.5
Output Control Input Current
VIN=VREF
3.5
Dead Time Control Section
Input bias (pin 4)
II(BIAS) VIN=0 ~ 5.25V
-2
-10
Maximum duty cycle, each output
VIN(pin 40)=0
45
Input threshold Voltage(pin 4)
VTHR Zero duty Cycle
3
3.3
Maximum duty cycle
0
PWM comparator Section
Input Threshold Voltage(pin 3)
VTHR Zero Duty cycle
4
4.5
Input Sink Current (pin 3)
II(SINK) V(pin 3)= 0.7V
0.3
0.7
Total Device
6
10
VCC =15V
pin 6 at VREF, all other Inputs and
Standby Supply Current
IST-BY
outputs open
9
15
VCC =40V
Average supply current
V(pin 4)=2V
7.5
Switching Characteristics, Ta=25°C
Output Voltage Rise Time
tR
100 200
Common-emitter configuration
Output Voltage Fall Time
tF
25
100
Output Voltage Rise Time
tR
100 200
Emitter-follower configuration
Output Voltage Fall Time
tF
40
100
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:
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
UNIT
V
mV
mV
%
mA
kHz
%
%
%
mV
nA
μA
V
dB
kHz
dB
mA
mA
μA
μA
V
mA
μA
%
V
V
mA
mA
mA
ns
ns
ns
ns
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QW-R103-004,F
TL494
„
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
Vcc=15V
2W 150
12
TEST
INPUTS
4
3
12k
6
5
0.01 F
DEAD-TIME
Vcc
FEEDBACK
C1
E1
2W 150
8
OUTPUT 1
9
RT
CT
1
C2
E2
11
10
OUTPUT 2
2
16
ERROR AMPLIFIER
15
13
50k
OUTPUT CONTROL VREF OUTPUT
GND
7
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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QW-R103-004,F
TL494
„
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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www.unisonic.com.tw
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QW-R103-004,F
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 believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R103-004,F