ZXGD3105N8

1 of 13

www.diodes.com

November 2011

© Diodes Incorporated

A Product Line of

Diodes Incorporated

ZXGD3105N8

SYNCHRONOUS MOSFET CONTROLLER IN SO-8

Description

ZXGD3105N8 synchronous controller is designed for driving a

MOSFET as an ideal rectifier. This is to replace a diode for increasing

the power transfer efficiency.

The device is comprised of a differential amplifier detector stage and

high current driver. The detector monitors the reverse voltage of the

MOSFET such that if body diode conduction occurs a positive voltage

is applied to the MOSFET’s Gate pin. Once the positive voltage is

applied to the Gate the MOSFET switches on allowing reverse current

flow. The detectors’ output voltage is then proportional to the

MOSFET Drain-Source voltage and this is applied to the Gate via the

driver. This action provides a rapid MOSFET turn off as Drain current

decays to zero.

Applications

Flyback and Resonant Converters in:

•

Low Voltage AC / DC Adaptors

•

Set Top Box

•

Computing Power Supplies - ATX and Server PSU

•

Low Voltage DC / DC conversion

Features

•

Low standby power with quiescent supply current < 1mA

•

4.5V operation enables low voltage supply

•

Proportional gate drive for fast turn-off

•

Operation up to 500kHz

•

Critical Conduction Mode (CrCM) & Continuous Mode (CCM)

•

Compliant with Eco-design directive

•

“Lead-Free”, RoHS Compliant (Note 1)

•

Halogen and Antimony free. “Green” Device (Note 2)

•

Qualified to AEC-Q101 Standards for High Reliability

Mechanical Data

•

Case: SO-8

•

Case material: Molded Plastic. “Green” Molding Compound.

•

UL Flammability Rating 94V-0

•

Moisture Sensitivity: Level 1 per J-STD-020

•

Terminals: Matte Tin Finish

•

Solderable per MIL-STD-202, Method 208

•

Weight: 0.074 grams (approximate)

Product

Marking

Reel size (inches)

Tape width (mm)

Quantity per reel

ZXGD3105N8TC

ZXGD 3105

13

12

2500

Notes:

1. No purposefully added lead

2. Diodes Inc’s “Green” Policy can be found on our website at http://www.diodes.com

3. For packaging details, go to our website at http://www.diodes.com

Marking Information

ZXGD

= Product Type Marking Code, Line 1

3105

= Product Type Marking Code, Line 2

YY

= Year (ex: 11 = 2011)

WW

= Week (01 - 53)

Top View

Pin-Out

SO-8

ZXGD

3105

YY WW

GATE

GND

Vcc

BIAS

DRAIN

REF

DNC

DNC