鈥?/div>
Fully Interchangeable with
Standard UC1524 Family
DESCRIPTION
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
Precision Reference Internally
is pin compatible with 鈥渘on-A鈥?models and in most existing applications can be
Trimmed to
鹵
1%
directly interchanged with no effect on power supply performance. Using the
High-Performance Current Limit UC1524A, however, frees the designer from many concerns which typically had
Function
required additional circuitry to solve.
Under-Voltage Lockout with
Hysteretic Turn-on
Start-Up Supply Current Less
Than 4mA
Output Current to 200mA
60V Output Capability
Wide Common-Mode Input
Range for both Error and
Current Limit Amplifiers
PWM Latch Insures Single
Pulse per Period
Double Pulse Suppression
Logic
200ns Shutdown through PWM
Latch
Guaranteed Frequency
Accuracy
Thermal Shutdown Protection
The UC1524A includes a precise 5V reference trimmed to
鹵
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.
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.
Other product enhancements included in the UC1524A鈥檚 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.
The UC1524A is packaged in a hermetic 16-pin DIP and is rated for operation
from -55擄C to +125擄C. The UC2524A and 3524A are available in either ceramic
or plastic packages and are rated for operation from -40擄C to +85擄C and 0擄C to
70擄C, respectively. Surface mount devices are also available.
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
BLOCK DIAGRAM
+5V
REFERENCE
REGULATOR
V
IN
OSC
R
T
C
T
COMP
INV. INPUT
N.I. INPUT
CL (+) SENSE
CL (鈥? SENSE
15
U.V.
SENSE
POWER TO
INTERNAL
CIRCUITRY
T
OSC
CLOCK
RAMP
9
V
IN
1
2
200mV
+
4
5
16
12
V
REF
C
A
3
6
7
FLIP
FLOP
11
E
A
C
B
+
鈥?/div>
COMP
S
R
13
PWM
S LATCH
14
1k
10
6V
10k
5.5V
8
GND
E
B
SHUTDOWN
鈥?/div>
E/A
+
V
IN
+
C/L
鈥?/div>
UDG-99178
SLUS181A - NOVEMBER 1999
UC2524ANG4相關(guān)型號(hào)PDF文件下載
-
型號(hào)
版本
描述
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