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494-S

Part # 494-S
Description
Category Microcircuit
Availability In Stock
Qty 3
Qty Price
1 - 2 $45.92046
3 + $34.78823
Manufacturer Available Qty
LINEMASTER SWITCH
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

UNISONIC TECHNOLOGIES CO., LTD
TL494
LINEAR INTEGRATED CIRCUIT
www.unisonic.com.tw 1 of 7
Copyright © 2005 Unisonic Technologies Co., Ltd QW-R103-004,D
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
DIP-16
SOP-16
*Pb-free plating product number: TL494L
ORDERING INFORMATION
Order Number
Normal Lead Free Plating
Package Packing
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
(1) R: Tape Reel, T: Tube
(2) D16: DIP-16, S16: SOP-16
(3) L: Lead Free Plating, Blank: Pb/Sn
TL494 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 2 of 7
www.unisonic.com.tw QW-R103-004,D
PIN CONFIGURATIONS
BLOCK DIAGRAM
Error
Amplifier
Error
Amplifier
dead time
control
dead time comparator
oscillator
Pulse Steering
Flip-Flop
Input
control
5V reference
regulation
V
REF
Vcc
GND
PWM comparator
0.7mA
1
2
4
5
6
7
8
9
10
11
14
13
12
15
16
T
Q
Q
Q1
Q2
RT
CT
C1
E1
C2
E2
TL494 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD 3 of 7
www.unisonic.com.tw QW-R103-004,D
ABSOLUTE MAXIMUM RATINGS
(Unless otherwise noted all is over operating free air temperature range)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage(Note 3) V
CC
41 V
Amplifier Input Voltage V
IN
V
CC
+0.3 V
Collector Output Voltage V
OUT
41 V
Collector Output Current I
CO
250 mA
Ta=25°C 1000 mW
Continuous Total Dissipation
Derate at Ta＞25°C
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
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
RATINGS
PARAMETER SYMBOL
MIN MAX
UNIT
Supply Voltage V
CC
7 40 V
Amplifier Input Voltage V
IN
-0.3 Vcc-2 V
Collector Output Voltage V
OUT
40 V
Collector Output Current(each Transistor) Ic 200 mA
Current into Feedback I
f
0.3 mA
Timing Capacitor C
T
0.47 10000 nF
Timing Resistor R
T
1.8 500 kΩ
Oscillator Frequency fosc 1 300 kHz
Operating Free-Air Temperature Ta 0 70 °C
123NEXT
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