EV3908DK-00J
High Efficiency Isolated
Active Clamp Forward EV Board
EV3908DK-00J Rev. 1.0 www.MonolithicPower.com 1
9/20/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EV3908DK-00J is an evaluation board for the
MP3908DK. It is configured to provide a regulated
3.3V output at up to 20A load current from a 36V-
75V input. The output is adjustable by changing
feedback resistors on the evaluation board.
MP3908DK features a synchronous gate output
which enables high efficiency design by drive the
clamp MOSFET.
ELECTRICAL SPECIFICATIONS
Parameter Symbol Value Units
Input voltage V
IN
36–75 V
Input current I
IN
0–2 A
Output voltage V
O
3.3 V
Output Current I
O
20 A
FEATURES
• Isolated high efficiency 66W design
• Current Mode Control
• Cycle-by-Cycle Current Limiting
• 250kHz Constant Frequency Operation
APPLICATIONS
• Power over Ethernet (PoE)
• TV CCFL Power Generation
• Telecom Isolated Power
• Brick Modules
“MPS” and “Th e Fu ture o f Anal og IC T echnolo gy” are R egi stered T radem arks
of Monolithic Pow er System s, Inc.
EV3908DK-00J EVALUATION BOARD
(L x W x H) 3.6” x 2.8” x 0.6”
9.1cm x 7.1cm x 1.4cm
Board Number MPS IC Number
EV3908DK-00J MP3908DK
EFFICIENCY (%)
OUTPUT CURRENT (A)
Efficiency vs.
Output Current
40
50
60
70
80
90
100
048121620
V
IN
=36V
V
IN
=48V
V
IN
=75V