Diodes ZXGD3101T8 - Manual

Issue 4 - January 2009 1 www.zetex.com
© Diodes Incorporated 2009 www.diodes.com
A Product Line of
Diodes Incorporated
ZXGD3101T8
Synchronous rectifier controller for flyback converters.
Description
Ordering information
The ZXGD3101 is intended to drive MOSFETS
configured as ideal diode replacements. 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
reverse voltage drop and this is applied to the
Gate via the driver. This action provides a rapid
turn off as current decays.
Features
• Turn-off propagation delay 15ns and turn-
off time 20ns
• Suitable for Discontinuous Mode (DCM),
Critical Conduction Mode (CrCM) and
Continuous conduction mode (CCM)
operation
• Compliant with Energy Star V2.0 and
European Code of Conduct V3
• Low component count
• Halogen free
• 5-15V V
CC
range
Applications
Flyback converters in:
• Adaptors
• LCD monitors
• Server PSU’s
• Set top boxes
Refer to documents; AN54, DN90, DN91 and
DN94 available from the website
Pin out detail Typical configuration
Device Status Package Part Mark Reel size
(inches)
Tape width
(mm)
Quantity
per reel
ZXGD3101T8TA Active SM8 ZXGD3101 7 12 1000
N/C 1
2
3
4
8
7
6
5
REF
GATEH
GATEL
DRAIN
BIAS
V
CC
GND
SM8
D R A IN
G A T E H G N D
R E F B IA S V cc
G A T E L
3 1 0 1
S y n c h ro n o u s R e c tifie r
M O S FE T
R
B IA S
R
R E F
ZXGD
C1
Transformer