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LT8301MPS5

42VIN Micropower No-Opto Isolated Flyback Converter with 65V/1.2A Switch

Linear Technology 

LT8301

PIN FUNCTIONS

EN/UVLO (Pin 1): Enable/Undervoltage Lockout. The

EN/UVLO pin is used to enable the LT8301. Pull the pin

below 0.2V to shut down the LT8301. This pin has an ac-

curate 1.228V threshold and can be used to program a VIN

undervoltage lockout (UVLO) threshold using a resistor

divider from VIN to ground. A 2.5µA current hysteresis

allows the programming of VIN UVLO hysteresis. If neither

function is used, tie this pin directly to VIN.

GND (Pin 2): Ground. Tie this pin directly to local ground

plane.

RFB (Pin 3): Input Pin for External Feedback Resistor. Con-

nect a resistor from this pin to the transformer primary

SW pin. The ratio of the RFB resistor to an internal 10k

resistor, times a trimmed 1.0V reference voltage, deter-

mines the output voltage (plus the effect of any non-unity

transformer turns ratio). Minimize trace area at this pin.

SW (Pin 4): Drain of the 65V Internal DMOS Power Switch.

Minimize trace area at this pin to reduce EMI and voltage

spikes.

VIN (Pin 5): Input Supply. The VIN pin supplies current

to internal circuitry and serves as a reference voltage for

the feedback circuitry connected to the RFB pin. Locally

bypass this pin to ground with a capacitor.

8301f

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For more information www.linear.com/LT8301

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