SM74203 Datasheet, PDF (2/24 Pages) Texas Instruments – SM74203 60V Low Side Controller for Boost and SEPIC

SM74203
August 16, 2011
60V Low Side Controller for Boost and SEPIC
General Description
The SM74203 is a high voltage low-side N-channel MOSFET
controller ideal for use in boost and SEPIC regulators. It con-
tains all of the features needed to implement single ended
primary topologies. Output voltage regulation is based on
current-mode control, which eases the design of loop com-
pensation while providing inherent input voltage feed-forward.
The SM74203 includes a start-up regulator that operates over
a wide input range of 6V to 60V. The PWM controller is de-
signed for high speed capability including an oscillator fre-
quency range up to 2 MHz and total propagation delays less
than 100 ns. Additional features include an error amplifier,
precision reference, line under-voltage lockout, cycle-by-cy-
cle current limit, slope compensation, soft-start, external syn-
chronization capability and thermal shutdown. The SM74203
is available in the MSOP-10 package.
Features
■ ^{Renewable Energy Grade}
■ ^{Internal 60V Startup Regulator}
■ ^{1A Peak MOSFET Gate Driver}
■ ^V_IN ^{Range 6V to 60V}
■ ^{Duty Cycle Limit of 90%}
■ ^{Programmable UVLO with Hysteresis}
■ ^{Cycle-by-Cycle Current Limit}
■ ^{External Synchronizable (AC-coupled)}
■ ^{Single Resistor Oscillator Frequency Set}
■ ^{Slope Compensation}
■ ^{Adjustable Soft-start}
■ ^{MSOP-10 Package}
Applications
■ ^{Boost Converter}
■ ^{SEPIC Converter}
Typical Application
SM74203 in a boost converter.
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