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TL494IDE4 Datasheet(PDF) 1 Page - Texas Instruments

Part No. TL494IDE4
Description  PULSE-WIDTH-MODULATION CONTROL CIRCUITS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TL494IDE4 Datasheet(HTML) 1 Page - Texas Instruments

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FEATURES
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1IN+
1IN−
FEEDBACK
DTC
CT
RT
GND
C1
2IN+
2IN−
REF
OUTPUT CTRL
VCC
C2
E2
E1
D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
DESCRIPTION
TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005
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 With 5% Tolerance
Circuit Architecture Allows Easy
Synchronization
The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control
circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the
power-supply control circuitry to a specific application.
The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator,
a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.
The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control
comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed
by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common
circuits in synchronous multiple-rail power supplies.
The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The
TL494 provides for push-pull or single-ended output operation, which can be selected through the output-control
function. The architecture of this device prohibits the possibility of either output being pulsed twice during
push-pull operation.
The TL494C is characterized for operation from 0
°C to 70°C. The TL494I is characterized for operation from
–40
°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES(1)
SHRINK SMALL
THIN SHRINK
TA
SMALL OUTLINE
PLASTIC DIP
SMALL OUTLINE
OUTLINE
SMALL OUTLINE
(D)
(N)
(NS)
(DB)
(PW)
0
°C to 70°C
TL494CD
TL494CN
TL494CNS
TL494CDB
TL494CPW
–40
°C to 85°C
TL494ID
TL494IN
(1)
The D, DB, NS, and PW packages are available taped and reeled. Add the suffix R to device type (e.g., TL494CDR).
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 1983–2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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