LT8302MPS8E 查看數據表（PDF） - Linear Technology

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LT8302MPS8E

42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch

Linear Technology 

LT8302

Pin Functions

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

EN/UVLO pin is used to enable the LT8302. Pull the pin

below 0.3V to shut down the LT8302. This pin has an ac-

curate 1.214V 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.

INTVCC (Pin 2): Internal 3V Linear Regulator Output. The

INTVCC pin is supplied from VIN and powers the internal

control circuitry and gate driver. Do not overdrive the

INTVCC pin with any external supply, such as a third winding

supply. Locally bypass this pin to ground with a minimum

1µF ceramic capacitor.

VIN (Pin 3): Input Supply. The VIN pin supplies current to

the 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.

GND (Pin 4, Exposed Pad Pin 9): Ground. The exposed

pad provides both electrical contact to ground and good

thermal contact to the printed circuit board. Solder the

exposed pad directly to the ground plane.

SW (Pin 5): Drain of the Internal DMOS Power Switch.

Minimize trace area at this pin to reduce EMI and voltage

spikes.

RFB (Pin 6): 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 the RREF resistor,

times the internal voltage reference, determines the output

voltage (plus the effect of any non-unity transformer turns

ratio). Minimize trace area at this pin.

RREF (Pin 7): Input Pin for External Ground Referred Ref-

erence Resistor. The resistor at this pin should be in the

range of 10k, but for convenience in selecting a resistor

divider ratio, the value may range from 9.09k to 11.0k.

TC (Pin 8): Output Voltage Temperature Compensation. The

voltage at this pin is proportional to absolute temperature

(PTAT) with temperature coefficient equal to 3.35mV/°K,

i.e., equal to 1V at room temperature 25°C. The TC pin

voltage can be used to estimate the LT8302 junction tem-

perature. Connect a resistor from this pin to the RREF pin

to compensate the output diode temperature coefficient.

For more information www.linear.com/LT8302

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