TL1454, TL1454Y
DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM)
CONTROL CIRCUIT
SLVS086B – APRIL 1995 – REVISED NOVEMBER 1997
D
D
D
D
D
D
D
Two Complete PWM Control Circuits
Outputs Drive MOSFETs Directly
Oscillator Frequency . . . 50 kHz to 2 MHz
3.6-V to 20-V Supply-Voltage Range
Low Supply Current . . . 3.5 mA Typ
Adjustable Dead-Time Control, 0% to 100%
1.25-V Reference
D, N OR PW PACKAGE
(TOP VIEW)
description
CT
RT
DTC1
IN1 +
IN1 –
COMP1
GND
OUT1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
REF
SCP
DTC2
IN2 +
IN2 –
COMP2
V
CC
OUT2
The TL1454 is a dual-channel pulse-width-modu-
lation (PWM) control circuit, primarily intended for
low-power, dc/dc converters. Applications include
LCD displays, backlight inverters, notebook com-
puters, and other products requiring small, high-frequency, dc/dc converters. 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
TL1454 to be used in ground-sensing battery chargers as well as voltage converters.
AVAILABLE OPTIONS
PACKAGED DEVICES†
TA
– 20°C to 85°C
– 40°C to 85°C
SMALL OUTLINE
(D)
TL1454CD
TL1454ID
PLASTIC DIP
(N)
TL1454CN
TL1454IN
TSSOP
(PW)
TL1454CPWLE
—
CHIP FORM
(Y)
TL1454Y
—
† The D package is available taped and reeled. Add the suffix R to the device name (e.g., TL1454CDR). The
PW package is available only left-end taped and reeled (indicated by the LE suffix on the device type; e.g.,
TL1454CPWLE).
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.
Copyright
©
1997, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
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