The LM25180 is a primary-side regulated
(PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to
42 V. The isolated
output voltage is sampled from the primary-side flyback voltage, eliminating the need for an
optocoupler, voltage reference, or third winding from the transformer for output voltage
regulation.
The high level of integration results in a simple, reliable and high-density design with
only one component crossing the isolation barrier. Boundary conduction mode (BCM) switching enables
a compact magnetic solution and better than ±1.5% load and line regulation performance. An
integrated 65-V
power MOSFET provides output power up to 7 W with enhanced headroom for line transients.
The LM25180 flyback converter is
available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin
pitch.
The LM25180 flyback converter
simplifies implementation of isolated DC/DC supplies with optional features to optimize performance
for the target end equipment. The output voltage is set by one resistor, while an optional resistor
improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage
drop. Additional features include an internally-fixed or externally-programmable soft start,
optional bias supply connection for higher efficiency, precision enable input with hysteresis for
adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with
automatic recovery.
The LM25180 is a primary-side regulated
(PSR) flyback converter with high efficiency over a wide input voltage range of 4.5 V to
42 V. The isolated
output voltage is sampled from the primary-side flyback voltage, eliminating the need for an
optocoupler, voltage reference, or third winding from the transformer for output voltage
regulation.
The high level of integration results in a simple, reliable and high-density design with
only one component crossing the isolation barrier. Boundary conduction mode (BCM) switching enables
a compact magnetic solution and better than ±1.5% load and line regulation performance. An
integrated 65-V
power MOSFET provides output power up to 7 W with enhanced headroom for line transients.
The LM25180 flyback converter is
available in a 8-pin, 4-mm × 4-mm, thermally-enhanced WSON package with 0.8-mm pin
pitch.
The LM25180 flyback converter
simplifies implementation of isolated DC/DC supplies with optional features to optimize performance
for the target end equipment. The output voltage is set by one resistor, while an optional resistor
improves output voltage accuracy by negating the thermal coefficient of the flyback diode voltage
drop. Additional features include an internally-fixed or externally-programmable soft start,
optional bias supply connection for higher efficiency, precision enable input with hysteresis for
adjustable line UVLO, hiccup-mode overload protection, and thermal shutdown protection with
automatic recovery.