LM5037 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – Dual-Mode PWM Controller With Alternating Outputs

December 12, 2008
LM5037
Dual-Mode PWM Controller With Alternating Outputs
General Description
The LM5037 PWM controller contains all the features neces-
sary to implement balanced double-ended power converter
topologies, such as push-pull, half-bridge and full-bridge.
These double-ended topologies allow for higher efficiencies
and greater power densities compared to common single-
ended topologies such as the flyback and forward. The
LM5037 can be configured for either voltage mode or current
mode control with minimum external components. Two alter-
nating gate drive outputs are provided, each capable of 1.2A
peak output current. The LM5037 can be configured to oper-
ate directly from the input voltage rail over a wide range of
13V to 100V. Additional features include programmable max-
imum duty cycle limit, line under-voltage lockout, cycle-by-
cycle current limit and a hiccup mode fault protection with
adjustable timeout delay, soft-start and a 2 MHz capable os-
cillator with synchronization capability, precision reference
and thermal shutdown.
Features
■ ^{High voltage (100V) start-up regulator}
■ ^{Alternating outputs for double-ended topologies}
■ ^{Current-mode or feed-forward voltage-mode control}
■ ^{Programmable maximum duty cycle lLimit}
■ ^{2% feedback reference accuracy}
■ ^{High gain-bandwidth error amplifier}
■ ^{Programmable line under-voltage lockout (UVLO) with}
adjustable hysteresis
■ ^{Versatile dual mode over-current protection with hiccup}
delay timer
■ ^{Programmable soft-start}
■ ^{Precision 5V reference output}
■ ^{Current sense leading edge blanking}
■ ^{Resistor programmed 2 MHz capable oscillator}
■ ^{Oscillator synchronization capability with low frequency}
lockout protection
Package
■ ^TSSOP-16
Simplified Push-Pull Power Converter
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