Control Circuits. TL494D Datasheet

TL494D Datasheet PDF, Equivalent


Part Number

TL494D

Description

Pulse-Width-Modulation Control Circuits

Manufacture

HTC

Total Page 6 Pages
PDF Download
Download TL494D Datasheet PDF


TL494D Datasheet
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
Error
AMP 1
NONINV
INPUT
INV INPUT
FEEDBAC
DKEAD-TIME
CONTROL
CT
RT
GND
C1
SOP16/DIP16
(TOP VIEW)
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
NONINV
INPUT
INV INPUT
Error
AMP 2
REF OUT
OUTPUT
CONTROL
Vcc
C2
E2
E1
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
the power supply control circuitry to his application.
ORDERING INFORMATION
Device
Package
The TL494 contains an error amplifier, an on-chip adjustable
TL494D
16 SOP
oscillator, a dead-time control comparator, pulse-steering control
TL494N
16 DIP
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
RT
CT
OSCILLATOR
DEAD
TIME
CONTROL
0.1V
DEAD-TIME CONTROL COMPARATOR
NONINVERTING INPUT
INVERTING INPUT
ERROR AMPLIFIER
+
1
-
NONINVERTING INPUT
INVERTING INPUT
ERROR AMPLIFIER
+
2
-
PWM COMPARATOR
FEEDBACK
OUTPUT CONTROL
C1
PULSE-STEERING FLIP-FLOP
REFERENCE
Q1
C1
E1
Q2
C2
E2
Vcc
Vref
GND
2008 - Ver. 1.2
1/6
HTC

TL494D Datasheet
Pulse-Width-Modulation Control Circuits
Parameter measurement information
TL494
Vcc = 15V
TEST
INPUTS
50KΩ
DEAD-TIME
Vcc
12KΩ
0.01uF
FEEDBACK
RT
CT
(+)
(-) ERROR
(+)
(-)
OUTPUT
CONTROL
GND
150 Ω
2W
150 Ω
2W
C1 OUTPUT 1
E1 OUTPUT 2
C2
E2
REF OUT
TEST CIRCUIT
VOLTAGE
AT C1
VOLTAGE
AT C2
VOLTAGE
AT CT
DEAD-TIME
CONTROL
INPUT
FEEDBACK
THRESHOLD VOLTAGE
0V
THRESHOLD VOLTAGE
DUTY
CIRCLE
0.7 V
0%
MAX
0%
FIGURE 1. OPERATIONAL TEST CIRCUIT AND WAVEFORMS
Vcc
0
Vcc
0
2008 - Ver. 1.2
2/6
HTC


Features Datasheet pdf Pulse-Width-Modulation Control Circuits TL494 FEATURES ● Complete PWM Power Control Circuitry ● Uncommitted Outp uts for 200 mA Sink or Source Current Output Control Selects Single-Ended or Push-Pull Operation ● Internal Cir cuitry Prohibits Double Pulse at Either Output ● Variable Dead-Time Provides Control over Total Range ● Internal Regulator Provides a Stable 5-V Referen ce Supply,5% ● Circuit Architecture A llows Easy Synchronization ● Moisture Sensitivity Level 3 Error AMP 1 NONI NV INPUT INV INPUT FEEDBAC DKEAD-TIME CONTROL CT RT GND C1 SOP16/DIP16 (T OP VIEW) 1 16 2 15 3 14 4 13 5 12 6 11 7 10 89 NONINV INPUT INV INPUT Error AMP 2 REF OUT OUTPUT CONTROL Vcc C2 E2 E1 DESCRIPTION The TL494 incorpor ate on a single monolithic chip all the functions required in the constructio n of a pulse-width-modulation control, these devices offer the systems engine er the flexibility to tailor the power supply control circuitry to his application. ORDERING INFORMATION Device Pac.
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