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SG1846 Datasheet(PDF) 1 Page - Microsemi Corporation

Part No. SG1846
Description  CURRENT MODE PWM CONTROLLER
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Maker  MICROSEMI [Microsemi Corporation]
Homepage  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

SG1846 Datasheet(HTML) 1 Page - Microsemi Corporation

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CURRENT MODE PWM CONTROLLER
FEATURES
••••• Automatic feed forward compensation
••••• Programmable pulse by pulse current limiting
••••• Automatic symmetry correction in push-pull
configuration
••••• Enhanced load response characteristics
••••• Parallel operation capability for modular power
systems
••••• Differential current sense amplifier with wide
common mode range
••••• Double pulse suppression
••••• 200mA totem-pole outputs
••••• ± 1% bandgap reference
••••• Under-voltage lockout
••••• Soft-start capability
••••• Shutdown capability
••••• 500KHz operation
HIGH RELIABILITY FEATURES - SG1846
♦ Available to MIL-STD - 883
♦ Radiation data available
♦ LMI level "S" processing available
DESCRIPTION
The SG1846 family of control ICs provides all of the necessary
features to implement fixed frequency, current mode control
schemes while maintaining a minimum external parts count. The
superior performance of this technique can be measured in im-
proved line regulation, enhanced load response characteristics,
and a simpler, easier-to-design control loop. Topological advan-
tages include inherent pulse-by-pulse current limiting capability,
automatic symmetry correction for push-pull converters, and the
ability to parallel “power modules” while maintaining equal current
sharing.
Protection circuitry includes built-in under-voltage lockout and
programmable current limit in addition to soft start capability. A
shutdown function is also available which can initiate either a
complete shutdown with automatic restart or latch the supply off.
Other features include fully latched operation, double pulse sup-
pression, deadtime adjust capability, and a ±1% trimmed bandgap
reference.
BLOCK DIAGRAM
SG1846/SG2846/SG3846
4/90 Rev 1.1 2/94
LINFINITY Microelectronics Inc.
Copyright
© 1994
11861 Western Avenue
∞ Garden Grove, CA 92841
1
(714) 898-8121
∞ FAX: (714) 893-2570


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