TL1464 Datasheet, PDF (1/11 Pages) Texas Instruments – QUAD PULSE-WIDTH-MODULATION CONTROL CIRCUIT

TL1464I
QUAD PULSE-WIDTH-MODULATION CONTROL CIRCUIT
D High-Speed Drive Controller for PNP Power
Transistor
D Internal-Regulator Provides a Stable 1.5 V
Reference Supply
D Low Start-Up Voltage 3.1 V
SLVS266 – FEBRUARY 2000
D Internal Short-Circuit Protection
D Internal Undervoltage Lockout Protection
D Internal Shut-Down Circuit by Channel
D Controllable Base Current of External
Transistor
description
The TL1464I incorporates on a single monolithic chip all the functions required in the construction of a
pulse-width-modulation control circuit. Designed primarily for power supply control, the TL1464I contains an
on-chip 1.5 V regulator, four error amplifiers, an oscillator, two dead-time comparators, undervoltage lockout
circuitry, short circuit protection, standby control circuitry, and output circuits.
The external speed-up capacitors provide exceptional rise and fall time performance for the PNP power
transistor.
The TL1464I operates from 3.1 V supply voltage and 2 pair of four-outputs (CH-1/CH-3, CH-2/CH-4 the same
period) at the inverse phase of each other. As a result, the TL1464I provides high-efficiency power supply.
FUNCTION TABLE
INPUTS
OUTPUT FUNCTIONS
STANDBY
STANDBY-2 TO4
VREF
OUTPUT-1
OUTPUT-2
OUTPUT-3
OUTPUT-4
VI ≤ 0.4 V VI ≤ 0.4 V, VI ≥ 2.4 V
L
OFF
OFF
OFF
OFF
VI ≥ 2.4 V
VI ≥ 2.4 V
VI ≥ 0.4 V
H
H
ON
ON
ON
ON
ON
See Note
See Note
See Note
NOTE: When the STANDBY input is high (≥ 2.4 V), OUTPUT-2 to 4 are controlled individually. If STANDBY-2 input is low
(≤ 0.4 V), OUTPUT-2 is turned off. When CH-2 standby mode is released, CH-2 can do the soft-start function.
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.
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