LT8302HS8E-3-WPBF 查看數據表（PDF） - Analog Devices

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LT8302HS8E-3-WPBF

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

Analog Devices 

LT8302/LT8302-3

PIN FUNCTIONS

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

EN/UVLO pin is used to enable the LT8302/LT8302-3.

Pull the pin below 0.3V to shut down the LT8302/LT8302-

3. This pin has an accurate 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 inter-

nal control circuitry and gate driver. Do not overdrive the

INTVCC pin with any external supply, such as a third wind-

ing supply. Locally bypass this pin to ground with a mini-

mum 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 pri-

mary 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 trans-

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

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

Reference Resistor. The resistor at this pin should be in

the range of 10k, but for convenience in selecting a resis-

tor 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 tem-

perature (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/

LT8302-3 junction temperature. Connect a resistor from

this pin to the RREF pin to compensate the output diode

temperature coefficient.

Rev. G

For more information www.analog.com

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