UC1524A
UC2524A
UC3524A
Advanced Regulating Pulse Width Modulators
FEATURES
DESCRIPTION
•
•
•
•
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Fully Interchangeable with
Standard UC1524 Family
The UC1524A family of regulating PWM ICs has been designed to retain the
same highly versatile architecture of the industry standard UC1524 (SG1524)
while offering substantial improvements to many of its limitations. The UC1524A
is pin compatible with “non-A” models and in most existing applications can be
directly interchanged with no effect on power supply performance. Using the
UC1524A, however, frees the designer from many concerns which typically had
required additional circuitry to solve.
Precision Reference Internally
±
Trimmed to 1%
High-Performance Current Limit
Function
Under-Voltage Lockout with
Hysteretic Turn-on
±
The UC1524A includes a precise 5V reference trimmed to 1% accuracy, elimi-
nating the need for potentiometer adjustments; an error amplifier with an input
range which includes 5V, eliminating the need for a reference divider; a current
sense amplifier useful in either the ground or power supply output lines; and a
pair of 60V, 200mA uncommitted transistor switches which greatly enhance out-
put versatility.
Start-Up Supply Current Less
Than 4mA
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Output Current to 200mA
60V Output Capability
An additional feature of the UC1524A is an under-voltage lockout circuit which
disables all the internal circuitry, except the reference, until the input voltage has
risen to 8V. This holds standby current low until turn-on, greatly simplifying the
design of low power, off-line supplies. The turn-on circuit has approximately
600mV of hysteresis for jitter-free activation.
Wide Common-Mode Input
Range for both Error and
Current Limit Amplifiers
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PWM Latch Insures Single
Pulse per Period
Other product enhancements included in the UC1524A’s design include a PWM
latch which insures freedom from multiple pulsing within a period, even in noisy
environments, logic to eliminate double pulsing on a single output, a 200ns ex-
ternal shutdown capability, and automatic thermal protection from excessive
chip temperature. The oscillator circuit of the UC1524A is usable beyond 500kHz
and is now easier to synchronize with an external clock pulse.
Double Pulse Suppression
Logic
200ns Shutdown through PWM
Latch
The UC1524A is packaged in a hermetic 16-pin DIP and is rated for operation
from -55°C to +125°C. The UC2524A and 3524A are available in either ceramic
or plastic packages and are rated for operation from -40°C to +85°C and 0°C to
70°C, respectively. Surface mount devices are also available.
Guaranteed Frequency
Accuracy
Thermal Shutdown Protection
BLOCK DIAGRAM
+5V
15
3
REFERENCE
REGULATOR
16
12
V
V
REF
IN
POWER TO
INTERNAL
CIRCUITRY
U.V.
SENSE
C
A
OSC
FLIP
FLOP
6
7
T
R
T
11
13
E
A
OSC
CLOCK
C
T
COMP
RAMP
R
C
+
B
S
PWM
LATCH
–
COMP
9
1
S
V
IN
INV. INPUT
14
E
B
–
E/A
+
1k
10 SHUTDOWN
N.I. INPUT
2
4
V
200mV
IN
6V
10k
5.5V
CL (+) SENSE
8
GND
+
C/L
–
CL (–) SENSE
5
UDG-99178
SLUS181A - NOVEMBER 1999
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