2.1 Features .............................................................................................................................................. 2
2.2 High Reliability Features ..................................................................................................................... 2
3.3 Absolute Maximum Ratings ................................................................................................................ 8
4 Package Information ...................................................................................................................... 9
4.1 Thermal Data .................................................................................................................................... 13
5 Ordering Information ................................................................................................................... 14
Microsemi Proprietary and Confidential. SG1524B/SG2524B/SG3524B Datasheet Revision 2.0
Regulating Pulse Width Modulator
1
Revision History
The revision history describes the changes that were implemented in the document. The changes are
listed by revision, starting with the most current publication.
1.1
Revision 2.0
Revision 2.0 was published in July 2018. In revision 2.0 of this document, the format was updated to the
latest template. The following is the summary of changes in revision 2.0 of this document
Corrected a typo in the title of the document.
Formatting edits were done.
1.2
Revision 1.4
Revision 1.4 was published in December 2014. The following is the summary of changes in revision 1.4
of this document.
Corrected a typo in the
Features (see page 2)
section.
Corrected a typo in the
Ordering Information (see page 14)
section.
1.3
Revision 1.1
Revision 1.1 was published in February 1994. It was the first publication of this document.
Microsemi Proprietary and Confidential. SG1524B/SG2524B/SG3524B Datasheet Revision 2.0
1
Regulating Pulse Width Modulator
2
Product Overview
The SG1524B is a pulse width modulator for switching power supplies, that gives improved performance
over industry standards, like the SG1524. This is a direct pin-for-pin replacement for the earlier device,
and combines advanced processing techniques and circuit design to provide improved reference
accuracy, and extended common mode range at the error amplifier and current limit inputs. A
DC-coupled flip-flop eliminates triggering and glitch problems, and a pulse width modulator data latch
prevents edge oscillations. The circuit incorporates true digital shutdown for high speed response, while
an under voltage lockout circuit prevents spurious outputs when the supply voltage is too low for stable
operation. Full double-pulse suppression logic insures alternating output pulses when the shutdown pin
is used for pulse-by-pulse current limiting. SG1524B is specified for operation over the full military
ambient temperature range of –55 °C to 125 °C. It is characterized for the industrial range of
–25 °C to 85 °C, and is designed for the commercial range of 0 °C to 70 °C.
2.1
Features
The main features of SG1524B are as follows.
7 V to 40 V operation
5 V reference trimmed to ±1%
100 Hz to 400 kHz oscillator range
Excellent external sync capability
Dual 100 mA output transistors
Wide current limit common mode range
DC-coupled toggle flip-flop
PWM data latch
Undervoltage lockout
Full double pulse suppression logic
60 V output collectors
2.2
High Reliability Features
The high reliability features of SG1524B are as follows.
Available to MIL-STD-883
MSC-AMS level "S" processing available
Available to DSCC-standard microcircuit drawing (SMD)
Microsemi Proprietary and Confidential. SG1524B/SG2524B/SG3524B Datasheet Revision 2.0
2
Regulating Pulse Width Modulator
2.3
Block Diagram
The following figure shows the block diagram of SG1524B.
Figure 1 • SG1524B Block Diagram
Microsemi Proprietary and Confidential. SG1524B/SG2524B/SG3524B Datasheet Revision 2.0
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