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TL1451AM

更新时间： 2024-10-01 01:13:51
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德州仪器 - TI /
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36页 1285K
描述
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

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SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999  
D, DB, N, NS, PW, OR J PACKAGE  
(TOP VIEW)  
D
D
D
D
D
D
D
D
D
Complete PWM Power Control Circuitry  
Completely Synchronized Operation  
Internal Undervoltage Lockout Protection  
Wide Supply Voltage Range  
REF  
SCP  
2IN+  
2IN–  
2FEEDBACK  
2DTC  
CT  
RT  
1IN+  
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2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
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Internal Short-Circuit Protection  
Oscillator Frequency . . . 500 kHz Max  
ERROR  
AMPLIFIER 2  
ERROR  
AMPLIFIER 1 1IN–  
1FEEDBACK  
1DTC  
Variable Dead Time Provides Control Over  
Total Range  
2OUT  
1OUT  
GND  
Internal Regulator Provides a Stable 2.5-V  
Reference Supply  
V
CC  
Available in Q-Temp Automotive  
HighRel Automotive Applications  
Configuration Control / Print Support  
Qualification to Automotive Standards  
FK PACKAGE  
(TOP VIEW)  
description  
3
2
1
20 19  
1IN+  
1IN–  
2IN+  
4
5
6
7
8
18  
17  
16  
15  
14  
The TL1451A incorporates on a single monolithic  
chip all the functions required in the construction  
of two pulse-width-modulation (PWM) control  
circuits. Designed primarily for power-supply  
control, the TL1451A contains an on-chip 2.5-V  
regulator, two error amplifiers, an adjustable  
oscillator, two dead-time comparators, undervol-  
tage lockout circuitry, and dual common-emitter  
output transistor circuits.  
2IN–  
NC  
NC  
1FEEDBACK  
IDTC  
2FEEDBACK  
2DTC  
9
10 11 12 13  
The uncommitted output transistors provide  
common-emitter output capability for each  
controller. The internal amplifiers exhibit a common-mode voltage range from 1.04 V to 1.45 V. The dead-time  
control (DTC) comparator has no offset unless externally altered and can provide 0% to 100% dead time. The  
on-chip oscillator can be operated by terminating RT and CT. During low V  
lockout control circuit feature locks the outputs off until the internal circuitry is operational.  
conditions, the undervoltage  
CC  
The TL1451AC is characterized for operation from –20°C to 85°C. The TL1451AQ is characterized for operation  
from –40°C to 125°C. The TL1451AM is characterized for operation from –55°C to 125°C.  
AVAILABLE OPTIONS  
PACKAGED DEVICES  
SMALL  
OUTLINE  
(D)  
SMALL  
SMALL  
OUTLINE  
(NS)  
CHIP  
CARRIER  
(FK)  
CERAMIC  
DIP  
T
A
PLASTIC DIP  
(N)  
TSSOP  
(PW)  
OUTLINE  
†
†
(DB)  
(J)  
–20°C to 85°C  
–40°C to 125°C  
–55°C to 125°C  
TL1451ACD  
TL1451AQD  
—
TL1451ACDB  
TL1451ACN  
TL1451ACNS TL1451ACPW  
—
—
—
—
—
—
—
—
—
—
—
—
TL1451AMFK  
TL1451AMJ  
†
The DB and PW packages are only available left-end taped and reeled (add LE suffix, i.e., TL1451ACPWLE).  
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.  
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Copyright 1999, Texas Instruments Incorporated  
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