TL1451A Datasheet, PDF (1/29 Pages) Texas Instruments – DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
D Complete PWM Power Control Circuitry
D Completely Synchronized Operation
D Internal Undervoltage Lockout Protection
D Wide Supply Voltage Range
D Internal Short-Circuit Protection
D Oscillator Frequency . . . 500 kHz Max
D Variable Dead Time Provides Control Over
Total Range
D Internal Regulator Provides a Stable 2.5-V
Reference Supply
D Available in Q-Temp Automotive
HighRel Automotive Applications
Configuration Control / Print Support
Qualification to Automotive Standards
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
D, DB, N, NS, PW, OR J PACKAGE
(TOP VIEW)
CT 1
RT 2
ERROR 1IN + 3
AMPLIFIER 1 1IN – 4
1FEEDBACK 5
1DTC 6
1OUT 7
GND 8
16 REF
15 SCP
14 2IN + ERROR
13 2IN – AMPLIFIER 2
12 2FEEDBACK
11 2DTC
10 2OUT
9 V_CC
FK PACKAGE
(TOP VIEW)
description
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.
3 2 1 20 19
1IN+ ₄
18 ^2IN+
1IN– ₅
17 ^2IN–
NC ₆
16 ^NC
1FEEDBACK ₇
15 ^2FEEDBACK
IDTC ₈
14 ^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_CC conditions, the undervoltage
lockout control circuit feature locks the outputs off until the internal circuitry is operational.
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
TA
SMALL
OUTLINE
(D)
SMALL
OUTLINE
(DB)†
PLASTIC DIP
(N)
SMALL
OUTLINE
(NS)
TSSOP
(PW)†
CHIP
CARRIER
(FK)
– 20°C to 85°C
—
TL1451ACDB TL1451ACN TL1451ACNS TL1451ACPW
—
– 40°C to 125°C
TL1451AQD
—
—
—
—
—
– 55°C to 125°C
—
—
—
—
—
TL1451AMFK
† _{The DB and PW packages are only available left-end taped and reeled (add LE suffix, i.e., TL1451ACPWLE).}
CERAMIC
DIP
(J)
—
—
TL1451AMJ
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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1999, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
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