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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+
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
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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