UTC TL1451
LINEAR INTEGRATED CIRCUIT
DUAL PULSE-WIDTH-MODULATION
CONTROL CIRCUITS
DESCRIPTION
The UTC TL1451 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 TL1451 contains an on-chip 2.5V
regulator, two error amplifiers, an adjustable oscillator, two
dead-time comparators, undervoltage lockout circuitry, and
dual common –emitter output transistor circuits.
SOP-16
FEATURES
*Complete PWM Power control Circuitry
*Completely Synchronized Operation
*Internal Undervoltage Lockout Protection
*Wide Supply Voltage Range
*Internal Short-Circuit Protection
*Oscillator Frequency …
500kHz Max
*Variable Dead Time Provides Control Over Total Range
*Internal Regulator Provides a Stable 2.5V Reference Supply
DIP-16
PIN CONFIGURATIONS
CT
RT
ERROR
AMPLIFIER
1
1 IN+
1 IN-
1
2
3
4
5
6
7
8
16
15
REF
SCP
ERROR
AMPLIFIER
2
14
2 IN+
13
12
11
10
9
2 IN-
1 FEEDBACK
1 DTC
1 OUT
GND
2 FEEDBACK
2 DTC
2 OUT
Vcc
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R103-011,A
UTC-IC [ UNISONIC TECHNOLOGIES ]
