LT8301MP 查看數據表（PDF） - Analog Devices

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LT8301MP

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

Analog Devices 

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

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

VIN

CIN

5

VIN

RFB

3

RFB

1:4

M3

M2

25µA

RREF

10kΩ

1.0V

R1

EN/UVLO

1

R2

2.5µA

1.228V

–

A1

+

M4

–

gm

+

OSCILLATOR

–

A3

+

VIN

REFERENCE

REGULATORS

BOUNDARY

DETECTOR

T1

NPS:1

DOUT

LPRI

•

•

LSEC

4

SW

VOUT+

COUT

VOUT–

S

RQ

DRIVER

M1

A2

RSENSE

GND

2

8301 BD

Rev. B

6

For more information www.analog.com

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