LT8301 datasheet(6/24 Pages) AD

6 / 24 page

LT8301

Rev. B

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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

accurate 1.228V threshold and can be used to program a

VIN undervoltage lockout (UVLO) threshold using a resis-

tor 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.

Connect 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.

BLOCK DIAGRAM

8301 BD

OSCILLATOR

1:4

1.0V

25µA

BOUNDARY

DETECTOR

DRIVER

–

RSENSE

RREF

10kΩ

RFB

2.5µA

EN/UVLO

1.228V

REFERENCE

REGULATORS

VIN

GND

RFB

VIN

NPS:1

DOUT

LSEC

LPRI

VOUT+

VOUT–

•

COUT

CIN

LT8301 Datasheet(PDF) 6 Page - Analog Devices

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