SG1549Y Microsemi Corporation, SG1549Y Datasheet

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SG1549Y

Manufacturer Part Number
SG1549Y
Description
Current Sense Latch
Manufacturer
Microsemi Corporation
Datasheet

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Rev 1.1a 03/17/2005
Copyright
SCHEMATIC
DESCRIPTION
This monolithic integrated circuit is an analog latch device with digital reset. It was
specifically designed to provide pulse-by-pulse current limiting for switch-mode power
supply systems, but many other application are also feasible. Its function is to provide
a latching switch action upon sensing an input threshold voltage, with reset accom-
plished by an external clock signal. This device can be interfaced directly with many
kinds of pulse width modulating control IC's, including the SG1524, SG1525A and
SG1527A.
The input threshold for the latch circuit is 100mV, which can be referenced either to
ground or to a wide-ranging positive voltage. There are high and low-going output
signals available, and both the supply voltage and clock signal can be taken directly
from an associated PWM control chip.
With delays in the range of 200 nanoseconds, this latch circuit is ideal for fast reaction
sensing to provide overall current limiting, short circuit protection, or transformer
saturation control.
BLOCK DIAGRAM
1994
1
CURRENT SENSE LATCH
SG1549/SG2549/SG3549
FEATURES
HIGH RELIABILITY FEATURES
Current sensing with 100mV
threshold
Common-mode input at ground or
to 40V
Complementary outputs
Automatic reset from PWM clock
180ns delay
Interface direct to SG1524,
SG1525A, SG1527A
- SG1549
Available to MIL-STD-883
LMI level "S" processing available
Radiation data available
11861 Western Avenue
(714) 898-8121
Garden Grove, CA 92841
FAX: (714) 893-2570
Microsemi Inc.

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SG1549Y Summary of contents

Page 1

DESCRIPTION This monolithic integrated circuit is an analog latch device with digital reset. It was specifically designed to provide pulse-by-pulse current limiting for switch-mode power supply systems, but many other application are also feasible. Its function is to provide a ...

Page 2

... JC , ............. 95°C/W JA (Note 2) 5.0V Reset HI Voltage .................................................... 2V to 40V Operating Ambient Temperature Range 5V to 40V SG1549Y ....................................................... 0 to 10mA SG2549Y or M ................................................. 0V to 0.8V SG3549Y or M .................................................... 70 C, and V = 5V. Low duty cycle pulse testing techniques are used which maintains junction and case A S Test Conditions V ...

Page 3

ELECTRICAL CHARACTERISTICS (V = 5V, and over recomended operating temperature, unless otherwise specified.) S Parameter HI Output Section Off Voltage On Voltage LO Output Off Leakage On Voltage TYPICAL SWITCHING CHARACTERISTICS ( ...

Page 4

... D Package Pb-free transition DC:0440 100% Pb-free Matte Tin Lead Finish CONNECTION DIAGRAMS & ORDERING INFORMATION Package Part No. 8-PIN CERAMIC DIP SG1549Y/883B Y - PACKAGE SG1549Y/DESC SG1549Y SG2549Y SG3549Y 8-PIN PLASTIC DIP SG2549M M - PACKAGE SG3549M Note 1. Contact factory for JAN and DESC product availability. ...

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