TL494G-D16-T [UTC]
VOLTAGE MODE PWM CONTROL CIRCUIT; 电压模式PWM控制电路
| 型号： | TL494G-D16-T |
| 厂家： | 
Unisonic Technologies |
| 描述： | VOLTAGE MODE PWM CONTROL CIRCUIT |
| 文件： | 总7页 (文件大小：189K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
TL494
LINEAR INTEGRATED CIRCUIT
VOLTAGE MODE PWM
CONTROL CIRCUIT
SOP-16
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.
DIP-16
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
Package
Packing
Lead Free
Halogen Free
TL494L-D16-T
TL494L-S16-R
TL494L-S16-T
TL494G-D16-T
TL494G-S16-R
TL494G-S16-T
DIP-16
SOP-16
SOP-16
Tube
Tape Reel
Tube
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Copyright © 2012 Unisonic Technologies Co., Ltd
QW-R103-004,G
TL494
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
BLOCK DIAGRAM
13
Input
control
Pulse Steering
Flip-Flop
8
9
C1
E1
Q
Q
Q1
Q2
RT
6
T
CT
oscillator
11 C2
5
10 E2
dead time comparator
14
4
VREF
dead time
control
5V reference
regulation
12
Vcc
PWM comparator
0.7mA
1
2
16
15
7
GND
Error
Amplifier
Error
Amplifier
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TL494
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS (unless otherwise specified)
PARAMETER
SYMBOL
VCC
RATINGS
41
UNIT
V
Supply Voltage(Note 3)
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current
Power Dissipation (TA=25°C)
Derate at TA＞25°C
VIN
VCC+0.3
41
V
VOUT
ICO
V
250
mA
mW
mW/°C
°C
°C
°C
1000
PD
9.2
Junction Temperature
Operating Temperature
Storage Temperature
TJ
125
TOPR
TSTG
-25 ~ +85
-40 ~ +150
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
SYMBOL
VCC
VIN
MIN
7
TYP
MAX
40
UNIT
V
Supply Voltage
Amplifier Input Voltage
Collector Output Voltage
Collector Output Current (each Transistor)
Current into Feedback
-0.3
Vcc-2
40
V
VOUT
IC
V
200
0.3
mA
mA
nF
kΩ
kHz
°C
If
Timing Capacitor
CT
0.47
1.8
1
10000
500
300
70
Timing Resistor
RT
Oscillator Frequency
fOSC
TA
Operating Free-Air Temperature
0
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
Input Regulation
Output Regulation
Output Voltage Change with Temperature
Short-Circuit Output Current
OSCILLATOR SECTION
Frequency
VOUT IOUT=1mA
VIN VCC=7V ~ 40V
VOUT IOUT=1 ~ 10mA
ΔTa=MIN ~ MAX(note 2)
IO(SC) VREF=0
4.75
5
2
1
0.2
35
5.25
25
15
1
V
mV
mV
%
mA
F
CT=0.01μF, RT=12kΩ
10
10
kHz
%
All Values of VCC CT, RT, TA
constant
VCC=7V ~ 40V,Ta=25°C
CT=0.01μF, RT=12kΩ,
ΔTa=MIN ~ MAX
Standard Deviation of Frequency
Frequency Change with Voltage
Frequency Change with Temperature
0.1
%
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
Input Offset Current
Input Bias Current
Error
VI(OFF) VOUT (pin 3)=2.5V
II(OFF) VOUT (pin 3)=2.5V
II(BIAS) VOUT (pin 3)=2.5V
2
10
250
1
mV
nA
μA
25
0.2
-0.3 ~
Common-Mode Input Voltage Range Error
VCC=7V ~ 40 V
V
VCC-2
Open-Loop Voltage Amplification
Unity-Gain Bandwidth
ΔVOUT=3V, VOUT=0.5V ~ 3.5V
70
95
800
80
dB
kHz
dB
GBW
Common-Mode Rejection Ratio
Error
CMRR VCC=40V,TA=25°C
65
VID=-15mV ~ -5V
V(pin 3)=0.5V
Output Sink Current(pin 3)
IO(SINK)
0.3
-2
0.7
mA
mA
Output source Current(pin 3)
OUTPUT SECTION
IO(SOURCE) VID=15mV ~ -5V, V(pin 3)=3.5V
Collector off-state current
Emitter off-state Current
IC(OFF) VCE=40V, VCC=40V
IE(OFF) VCC=VC=40V, VE=0
VE=0, IC=200mA
2
100
μA
-100 μA
Common-emitter
Emitter-Follower
1.1
1.5
1.3
2.5
3.5
V
Collector -emitter
Saturation Voltage
VC=15V, IE=-200mA
VIN=VREF
Output Control Input Current
DEAD TIME CONTROL SECTION
Input bias (pin 4)
mA
II(BIAS) VIN=0 ~ 5.25V
VIN(pin 40)=0
-2
3
-10
3.3
μA
%
V
Maximum duty cycle, each output
Input threshold Voltage(pin 4)
45
0
VTHR Zero duty Cycle
Maximum duty cycle
PWM COMPARATOR SECTION
Input Threshold Voltage(pin 3)
Input Sink Current (pin 3)
TOTAL DEVICE
VTHR Zero Duty cycle
II(SINK) V(pin 3)= 0.7V
4
4.5
V
0.3
0.7
mA
VCC =15V
VCC =40V
6
9
10
15
mA
mA
pin 6 at VREF, all other Inputs and
outputs open
Standby Supply Current
Average supply current
IST-BY
V(pin 4)=2V
7.5
SWITCHING CHARACTERISTICS, TA=25°C
Output Voltage Rise Time
tR
100 200
25 100
100 200
40 100
ns
ns
ns
ns
Common-emitter configuration
tF
Output Voltage Fall Time
Output Voltage Rise Time
tR
Emitter-follower configuration
tF
Output Voltage Fall Time
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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TL494
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
Vcc=15V
2W 150
2W 150
12
TEST
INPUTS
4
3
6
5
1
2
8
Vcc
DEAD-TIME
C1
OUTPUT 1
9
FEEDBACK
E1
12k
RT
CT
11
C2
E2
OUTPUT 2
0.01
F
10
ERROR AMPLIFIER
16
15
13
14
VREF OUTPUT
OUTPUT CONTROL
GND
7
50k
VOLTAGE at C1
VOLTAGE at C2
VOLTAGE at CT
DEAD-TIME
THRESHOLD VOLTAGE
CONTROL INPUT
THRESHOLD VOLTAGE
FEEDBACK
FIG 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS
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TL494
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT(Cont.)
ERROR
AMPLIFIER
1
Vin
FEEDBACK
TERMINAL
2
16
Vref
15
ERROR
AMPLIFIER
FIG 2. AMPLIFIER CHARACTERISTICS
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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 believed to be accurate
and reliable and may be changed without notice.
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