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Texas Instruments LM25185/LM25185-Q1 PSR Flyback DC-DC Controller is a primary-side regulated (PSR) flyback controller with high efficiency over a voltage range of 4.5V to 42V. The isolated output voltage is sampled from the primary-side flyback voltage. This feature eliminates the need for a voltage reference, optocoupler, or third winding from the transformer for output voltage regulation. The high level of integration results in a reliable, high-density, and simple design with only a transformer crossing the isolation barrier. Boundary conduction mode (BCM) switching enables a compact magnetic design, performing better than ±1.5% load and line regulation. BCM supports up to 42V input applications with enhanced headroom for line transients.
The LM25185/LM25185-Q1 flyback controller simplifies the 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. The LM25185 controller, with the integrated high-current MOSFET gate driver, extends the power range from less than 1W to more than 50W, making the device a scalable and easy-to-migrate design over a wide power range. The tunable compensation using the COMP pin and the adjustable peak current limit with the current-sensing resistor make the design flexible and an excellent choice for different application requirements.
The LM25185/LM25185-Q1 flyback controller is available in a 14-pin, 5mm x 4.4mm, thermally-enhanced HTSSOP package with a 0.65mm pin pitch. Texas Instruments LM25185-Q1 devices are AEC-Q100 qualified for automotive applications.
