TL1453CPWR Datasheet, PDF (1/8 Pages) Texas Instruments – DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUIT

TL1453C
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUIT
D Complete PWM Power Control Circuitry
D Completely Synchronized Operation
D Internal Undervoltage Lockout Protection
D Wide Supply Voltage Range
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
description
SLVS039A – FEBRUARY 1990 – REVISED DECEMBER 1990
N OR NS PACKAGE
(T0P VIEW)
C_T 1
{ ^{RT 2}
ERROR IN+ 3
AMPLIFIER 1 IN– 4
1 FEEDBACK 5
1 DEAD-TIME CONTROL 6
1 OUTPUT 7
GND 8
16 REF
15 SCP
} ^{14 IN+ ERROR}
13 IN– AMPLIFIER 2
12 2 FEEDBACK
11 2 DEAD-TIME CONTROL
10 2 OUTPUT
9 V_CC
The TL1453C incorporates the functions required in the construction of two pulse-width-modulation control
circuits on a single monolithic chip. Designed primarily for power supply control, the TL1453C contains an
on-chip 2.5-V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators, undervoltage
lockout circuitry, and dual common-emitter output transistor circuits.
The uncommitted output transistors provide common-emitter output capability for each controller. The internal
amplifiers exhibit a common-mode voltage range from 1.05 V to 1.45 V. The dead-time control comparator has
no offset unless externally altered and may be used to provide 0% to 100% dead time. The on-chip oscillator
may be operated by terminating R_T (pin 2) and C_T (pin 1). During low-V_CC conditions, the undervoltage lockout
control circuit feature inhibits the output until the internal circuitry is operational.
The TL1453C is characterized for operation from –20°C to 85°C.
functional block diagram
Vref = 2.5 V
16
REF
VCC
9
Reference
Voltage
3
1 IN+
Error Amp.1
2.5 V
2V
1.4 V
4
1 IN–
5
1 FEEDBACK
12
2 FEEDBACK
14
2 IN+
Error Amp.2
13
2 IN–
2.5 V
15
SCP
UVLO†
2.5 V
† _{UVLO = Undervoltage Lockout Protection}
6
1 DEAD-TIME CONTROL
CT RT
1
2
Triangle
Oscillator
PWM Comparator 1
1
7
1 OUTPUT
10
2 OUTPUT
2
PWM Comparator 2
8
11
GND
2 DEAD-TIME CONTROL
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 © 1990, Texas Instruments Incorporated
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