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SG1525AJ/DESC

Description
0.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP16
CategoryPower/power management    The power supply circuit   
File Size528KB,13 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
Related ProductsFound15parts with similar functions to SG1525AJ/DESC
Download Datasheet Parametric View All

SG1525AJ/DESC Overview

0.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP16

SG1525AJ/DESC Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
MakerMicrosemi
Parts packaging codeDIP
package instructionDIP,
Contacts16
Reach Compliance Codecompliant
ECCN codeEAR99
Is SamacsysN
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage35 V
Minimum input voltage8 V
Nominal input voltage20 V
JESD-30 codeR-GDIP-T16
JESD-609 codee0
length19.62 mm
Number of functions1
Number of terminals16
Maximum output current0.5 A
Package body materialCERAMIC, GLASS-SEALED
encapsulated codeDIP
Package shapeRECTANGULAR
Package formIN-LINE
Peak Reflow Temperature (Celsius)NOT SPECIFIED
Certification statusNot Qualified
Maximum seat height5.08 mm
surface mountNO
Switch configurationPUSH-PULL
Maximum switching frequency500 kHz
Terminal surfaceTIN LEAD
Terminal formTHROUGH-HOLE
Terminal pitch2.54 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width7.62 mm
Base Number Matches1
SG1525A/SG2525A/SG3525A
SG1527A/SG2527A/SG3527A
Regulating Pulse Width Modulator
Description
The SG1525A/1527A series of pulse width modulator integrated
circuits are designed to offer improved performance and lower
external parts count when used to implement all types of switching
power supplies. The on-chip +5.1 V reference is trimmed to ±1%
initial accuracy and the input common-mode range of the error
amplifier includes the reference voltage, eliminating external
potentiometers and divider resistors. A Sync input to the oscillator
allows multiple units to be slaved together, or a single unit to be
synchronized to an external system clock. A single resistor between
the C
T
pin and the Discharge pin provides a wide range of deadtime
adjustment. These devices also feature built-in soft-start circuitry
with only a timing capacitor required externally. A Shutdown pin
controls both the soft-start circuitry and the output stages, providing
instantaneous turn-off with soft-start recycle for slow turn-on. These
functions are also controlled by an undervoltage lockout which
keeps the outputs off and the soft-start capacitor discharged for
input voltages less than that required for normal operation. Another
unique feature of these PWM circuits is a latch following the
comparator. Once a PWM pulse has been terminated for any
reason, the outputs remain off for the duration of the period. The
latch is reset with each clock pulse. The output stages are totem-
pole designs capable of sourcing or sinking in excess of 200mA.
The SG1525A output stage features NOR logic, giving a LOW
output for an OFF state. The SG1527A utilizes OR logic, which
results in a HIGH output level when OFF
.
Features
8V to 35V Operation
5.1V Reference Trimmed to
1%
100Hz to 500kHz Oscillator Range
Separate Oscillator Sync Terminal
Adjustable Deadtime Control
Internal Soft-start
Input Undervoltage Lockout
Latching P.W.M. to Prevent Multiple Pulses
Dual Source/Sink Output Drivers
High Reliability Features
Following are the high reliability features of SG1525A
and SG1527A:
Available to MIL-STD-883, ¶ 1.2.1
MIL-M38510/12602BEA - JAN1525AJ
MIL-M38510/12604BEA - JAN1527AJ
MSC-AMS level “S” Processing Available
Block Diagram
V
REF
V
C
+V
IN
GROUND
SYNC
R
T
C
T
DISCHARGE
P.W.M.
S
REFERENCE
REGULATOR
U.V.
LOCKOUT
TO
INTERNAL CIRCUITRY
OSC OUTPUT
Q
OSCILLATOR
Q
F/F
R
LATCH
OUTPUT A
OUTPUT B
SG1525A OUTPUT STAGE
V
C
+
COMPENSATION
INV. INPUT
V
IN
OUTPUT A
N.I. INPUT
SOFT-SART
5k
SHUTDOWN
OUTPUT B
5k
SG1527A OUTPUT STAGE
+
ERROR
AMP
50µA
V
REF
Figure 1 ·
Block Diagram
September 2014 Rev. 1.4a
www.microsemi.com
© 2014 Microsemi Corporation
1

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