UNISONIC TECHNOLOGIES CO TL494 Technical data
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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
SOP-16
DIP-16
*Pb-free plating product number: TL494L
Order Number
Normal Lead Free Plating
TL494-D16-T TL494L-D16-T DIP-16 Tube
TL494-S16-R TL494L-S16-R SOP-16 Tape Reel
TL494-S16-T TL494L-S16-T SOP-16 Tube
TL494L-D16-T
(1)Packing Type
(2)Package Type
(3)Lead Plating
Package Packing
(1) R: Tape Reel, T: Tube
(2) D16: DIP-16, S16: SOP-16
(3) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2005 Unisonic Technologies Co., Ltd QW-R103-004,D
TL494 LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATIONS
BLOCK DIAGRAM
RT
6
CT
5
dead time comparator
4
dead time
control
0.7mA
1
2
Error
Amplifier
oscillator
Pulse Steering
Flip-Flop
PWM comparator
Error
Amplifier
16
15
13
Input
control
C1
8
Q
T
Q
5V reference
regulation
Q1
Q2
V
Vcc
GND
REF
11
10
14
12
E1
9
C2
E2
7
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TL494 LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(Unless otherwise noted all is over operating free air temperature range)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage(Note 3) VCC 41 V
Amplifier Input Voltage VIN V
Collector Output Voltage V
Collector Output Current ICO 250 mA
Continuous Total Dissipation
Junction Temperature TJ 125 °C
Operating Temperature T
Storage Temperature T
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.
Ta=25°C 1000 mW
Derate at Ta＞25°C
41 V
OUT
PD
-25 ~ +85 °C
OPR
-40 ~ +150 °C
STG
RECOMMENDED OPERATING CONDITIONS
+0.3 V
CC
9.2 mW/°C
PARAMETER SYMBOL
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 fosc 1 300 kHz
Operating Free-Air Temperature Ta 0 70 °C
40 V
OUT
RATINGS
MIN MAX
UNIT
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