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TL494D Datasheet(PDF) 1 Page - HTC Korea TAEJIN Technology Co.

Part No. TL494D
Description  Pulse-Width-Modulation Control Circuits
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Manufacturer  HTC [HTC Korea TAEJIN Technology Co.]
Direct Link  http://www.htckorea.co.kr
Logo HTC - HTC Korea TAEJIN Technology Co.

TL494D Datasheet(HTML) 1 Page - HTC Korea TAEJIN Technology Co.

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Pulse-Width-Modulation Control Circuits
TL494
FEATURES
Complete PWM Power Control Circuitry
Uncommitted Outputs for 200 mA Sink or Source Current
Output Control Selects Single-Ended or Push-Pull Operation
Internal Circuitry Prohibits Double Pulse at Either Output
Variable Dead-Time Provides Control over Total Range
Internal Regulator Provides a Stable 5-V Reference Supply,5%
Circuit Architecture Allows Easy Synchronization
Moisture Sensitivity Level 3
DESCRIPTION
The TL494 incorporate on a single monolithic chip all the functions
required in the construction of a pulse-width-modulation control,
these devices offer the systems engineer the flexibility to tailor
ORDERING INFORMATION
the power supply control circuitry to his application.
The TL494 contains an error amplifier, an on-chip adjustable
oscillator, a dead-time control comparator, pulse-steering control
flip-flop, a 5-volt, 5% precision regulator, and output-control circuit.
The error amplifier exhibits a common-mode voltage range from -0.3 volts to Vcc -2 volts. The dead-time control
comparator has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip
oscillator may be bypassed by terminating R T (pin 6) to the reference output and providing a sawtooth in put to
CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The
uncommited output transistors provide either common-emitter or emitter-follower output capability. Each Device
provides for push-pull or single-ended output operation, which may be selected through the output-control funct
-ion. The architecture of these devices prohibits the possibility of either output being pulsed twice during push
-pull operation.
Functional Block Diagram
2008 - Ver. 1.2
HTC
TL494N
16 DIP
1 / 6
Device
Package
TL494D
16 SOP
SOP16/DIP16
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NONINV
INPUT
INV INPUT
FEEDBAC
K
DEAD-TIME
CONTROL
CT
RT
GND
C1
NONINV
INPUT
INV INPUT
REF OUT
Vcc
C2
E2
E1
OUTPUT
CONTROL
Error
AMP 1
Error
AMP 2
OSCILLATOR
REFERENCE
RT
CT
DEAD
TIME
CONTROL
0.1V
DEAD-TIME CONTROL COMPARATOR
PWM COMPARATOR
FEEDBACK
ERROR AMPLIFIER
ERROR AMPLIFIER
NONINVERTING INPUT
INVERTING INPUT
NONINVERTING INPUT
INVERTING INPUT
+
-
2
1
+
-
C1
PULSE-STEERING FLIP-FLOP
Q1
Q2
C1
E1
C2
E2
Vcc
Vref
GND
OUTPUT CONTROL


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