SG1525A Microsemi Corporation, SG1525A Datasheet

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SG1525A

Manufacturer Part Number
SG1525A
Description
REGULATING PULSE WIDTH MODULATOR
Manufacturer
Microsemi Corporation
Datasheet

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11/91 Rev 1.3 10/96
Copyright
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 volt 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
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 will 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.
BLOCK DIAGRAM
1996
T
pin and the Discharge pin provides a wide range of deadtime
REGULATING PULSE WIDTH MODULATOR
1
SG1525A/SG2525A/SG3525A
SG1527A/SG2527A/SG3527A
FEATURES
HIGH RELIABILITY 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
- SG1525A, SG1527A
Available to MIL-STD-883B
MIL-M38510/12602BEA - JAN1525AJ
MIL-M38510/12604BEA - JAN1527AJ
Radiation data available
LMI level "S" processing available
11861 Western Avenue
L
INFINITY Microelectronics Inc.
(714) 898-8121
Garden Grove, CA 92841
FAX: (714) 893-2570

Related parts for SG1525A

SG1525A Summary of contents

Page 1

... 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 ...

Page 2

... Oscillator Timing Resistor (R ) ........................ T Note 2: Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1525A/SG1527A with -55 C SG2525A/SG2527A with - SG3525A/SG3527A with used which maintains junction and case temperatures equal to the ambient temperature.) ...

Page 3

... COMP 35V 1nF 1nF 3V 35V IN 3 SG1525A/SG1527A SERIES SG1525A/2525A SG3525A SG1527A/2527A SG3527A Min. Typ. Max. Min. Typ. Max. 37.6 40 42.4 37.6 40 ±0.3 ±1 ±1 ±3 ±6 ±3 150 350 350 1.7 2.0 2.2 1.7 2.0 3.0 3 ...

Page 4

... OSCILLATOR SECTION FIGURE 2 - OSCILLATOR CHARGE TIME VS. R ERROR AMPLIFIER SECTION FIGURE 4 - ERROR AMPLIFIER 11/91 Rev 1.3 10/96 Copyright 1996 SG1525A/SG1527A SERIES FIGURE 1 - OSCILLATOR SCHEMATIC FIGURE 3 - OSCILLATOR DISCHARGE TIME VS. R AND FIGURE 5 - ERROR AMPLIFIER OPEN-LOOP 4 AND FREQUENCY RESPONSE L INFINITY Microelectronics Inc. 11861 Western Avenue ...

Page 5

... Rapid turn-off times for the power devices 1 3 are achieved with speed-up capacitors C Low power transformers can be driven directly by the SG1525A. Automatic reset occurs during deadtime, when both ends of the primary winding are switched to ground. 11861 Western Avenue 5 and C ...

Page 6

... The same results can be accomplished by pulling down on the Soft-Start terminal with the difference that on this pin, shutdown will not affect the amplifier compensation network but must discharge any Soft-Start capacitor. SG1525A/1527A LAB TEST FIXTURE 11/91 Rev 1.3 10/96 Copyright 1996 (continued) 3 ...

Page 7

... L- PACKAGE SG1527AL/883B SG1527AL Note 1. Contact factory for JAN and DESC product availablity. 2. All packages are viewed from the top. 11/91 Rev 1.3 10/96 Copyright 1996 SG1525A/SG1527A SERIES (See Notes Below) Ambient Connection Diagram Temperature Range - 125 C - 125 C - 125 C - 125 C ...

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