ZXGD3105N8 Datasheet, PDF (1/13 Pages) Diodes Incorporated – Low standby power with quiescent supply current < 1mA

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
A Product Line of
Diodes Incorporated
ZXGD3105N8
SYNCHRONOUS MOSFET CONTROLLER IN SO-8
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)
SO-8
Vcc
DNC
BIAS
DRAIN
Top View
Pin-Out
GATE
GND
DNC
REF
Ordering Information (Note 3)
Product
ZXGD3105N8TC
Marking
ZXGD 3105
Reel size (inches)
13
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
Tape width (mm)
12
Quantity per reel
2500
ZXGD3105N8
Document Number DS35101 Rev. 1 – 2
ZXGD
3105
YY WW
ZXGD
3105
YY
WW
= Product Type Marking Code, Line 1
= Product Type Marking Code, Line 2
= Year (ex: 11 = 2011)
= Week (01 - 53)
1 of 13
www.diodes.com
November 2011
© Diodes Incorporated