參數(shù)資料
型號(hào)： TL494
廠商： Fairchild Semiconductor Corporation
英文描述： SMPS Controller
中文描述： 開(kāi)關(guān)電源控制器
文件頁(yè)數(shù)： 1/17頁(yè)
文件大?。?/td> 449K
代理商： TL494
www.ti.com
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 With 5% Tolerance
Circuit Architecture Allows Easy
Synchronization
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
V
CC
C2
E2
E1
D, DB, N, NS, OR PW PACKAGE
(TOP VIEW)
DESCRIPTION
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.
TL494
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS074E–JANUARY 1983–REVISED FEBRUARY 2005
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 V
– 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
OUTLINE
(DB)
TL494CDB
—
THIN SHRINK
SMALL OUTLINE
(PW)
TL494CPW
—
T
A
SMALL OUTLINE
(D)
PLASTIC DIP
(N)
SMALL OUTLINE
(NS)
0
°
C to 70
°
C
–40
°
C to 85
°
C
TL494CD
TL494ID
TL494CN
TL494IN
TL494CNS
—
(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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright 1983–2005, Texas Instruments Incorporated
相關(guān)PDF資料
PDF描述
TL494CD SMPS Controller
TL494CN SMPS Controller
TL496C Replacement for Texas Instruments part number 54AS826/B3A. Buy from authorized manufacturer Rochester Electronics.
TL496CD Replacement for Texas Instruments part number 54AS826/BKA. Buy from authorized manufacturer Rochester Electronics.
TL496CP Replacement for Texas Instruments part number 54AS826/BLA. Buy from authorized manufacturer Rochester Electronics.
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TL494_05 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:SWITCHMODE TM Pulse Width Modulation Control Circuit
TL494_07 制造商:TI 制造商全稱:Texas Instruments 功能描述:PULSE-WIDTH-MODULATION CONTROL CIRCUITS
TL494_08 制造商:HTC 制造商全稱:HTC Korea TAEJIN Technology Co. 功能描述:Pulse-Width-Modulation Control Circuits
TL494_09 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:VOLTAGE MODE PWM CONTROL CIRCUIT
TL494_10 制造商:TI 制造商全稱:Texas Instruments 功能描述:PULSE-WIDTH-MODULATION CONTROL CIRCUITS
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