TL1454A_14 Datasheet, PDF (1/25 Pages) Texas Instruments – DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM) CONTROL CIRCUIT

TL1454A, TL1454AY
DUALĆCHANNEL PULSEĆWIDTHĆMODULATION (PWM)
CONTROL CIRCUIT
SLVS423 A− MAY 2002 − REVISED SEPTEMBER 2002
D Two Complete PWM Control Circuits
D Outputs Drive MOSFETs Directly
D Oscillator Frequency . . . 50 kHz to 2 MHz
D 3.6-V to 20-V Supply-Voltage Range
D Low Supply Current . . . 3.5 mA Typ
D Adjustable Dead-Time Control, 0% to 100%
D 1.26-V Reference
description
The TL1454A is a dual-channel pulse-width-mod-
ulation (PWM) control circuit, primarily intended
for low-power, dc/dc converters. Applications
include LCD displays, backlight inverters, note-
book computers, and other products requiring
small, high-frequency, dc/dc converters.
D, N OR PW PACKAGE
(TOP VIEW)
CT 1
RT 2
DTC1 3
IN1 + 4
IN1 − 5
COMP1 ⁶
GND ⁷
OUT1 ⁸
16 REF
15 SCP
14 DTC2
13 IN2 +
12 IN2 −
11 COMP2
10 V_CC
9 OUT2
Each PWM channel has its own error amplifier, PWM comparator, dead-time control comparator, and MOSFET
driver. The voltage reference, oscillator, undervoltage lockout, and short-circuit protection are common to both
channels.
Channel 1 is configured to drive n-channel MOSFETs in step-up or flyback converters, and channel 2 is
configured to drive p-channel MOSFETs in step-down or inverting converters. The operating frequency is set
with an external resistor and an external capacitor, and dead time is continuously adjustable from 0 to 100%
duty cycle with a resistive divider network. Soft start can be implemented by adding a capacitor to the dead-time
control (DTC) network. The error-amplifier common-mode input range includes ground, which allows the
TL1454A to be used in ground-sensing battery chargers as well as voltage converters.
AVAILABLE OPTIONS
PACKAGED DEVICES†
TA
SMALL OUTLINE PLASTIC DIP
TSSOP
(D)
(N)
(PW)
SSOP
(DB)
SOP-EIAJ
(NS)
CHIP FORM
(Y)
−20°C to 85°C
TL1454ACD
TL1454ACN TL1454ACPWR TL1454ACDB
TL1454ACNS
TL1454AY
† _{The D, DB and NS packages are available taped and reeled. Add the suffix R to the device name (e.g., TL1454ACDR). The PW package is}
available only left-end taped and reeled (indicated by the R suffix on the device type; e.g., TL1454ACPWR).
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.
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Copyright  2002, Texas Instruments Incorporated
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