MAX5003EVKIT データシートの表示（PDF） - Maxim Integrated
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MAX5003EVKIT Datasheet PDF : 5 Pages
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MAX5003 Evaluation Kit
Component List (continued)
DESIGNATION QTY
R19
0
R20
1
R21
1
SW1
1
SW2
1
T1
1
U1
1
U2
1
U3
1
None
1
None
1
None
1
DESCRIPTION
Not installed
680Ω ±5% resistor
15Ω ±5% resistor
DPDT switch
SPDT switch
65µH, 8:1:2.5 transformer
Coiltronics CTX03-14502
MAX5003EEE (16-pin QSOP)
2.5V voltage reference
Motorola TL431BCD
Low-current optocoupler
QT Opto MOC217
MAX5003 PC board
MAX5003 data sheet
MAX5003 EV kit data sheet
Component Suppliers
SUPPLIER
PHONE
FAX
AVX
803-946-0690
803-626-3123
Central
Semiconductor
516-435-1110
516-435-1824
Coiltronics
Dale-Vishay
Fairchild
561-241-7876
402-564-3131
408-822-2000
561-241-9339
402-563-6418
408-822-2102
International
Rectifier
310-322-3331
310-322-3332
Motorola
QT Optoelectronics
Sanyo
Taiyo Yuden
303-675-2140
408-720-1440
619-661-6835
408-573-4150
303-675-2150
408-720-0848
619-661-1055
408-573-4159
Note: Please indicate that you are using the MAX5003 when
contacting the above component suppliers.
Quick Start
The MAX5003 EV kit is fully assembled and tested.
Follow these steps to verify board operation in noniso-
lated mode. Do not turn on the power supply until all
connections are completed.
1) Connect a +36V to +72V power supply to the pad
labeled VIN. Do not exceed 100V input voltage.
The ground connects to the GND pad (-48V).
2) Connect a voltmeter and load (if any) to the +5V pad.
Table 1. Switch/Jumper Functions
FUNCTION
Nonisolated,
Non-level-shifted Feedback
Mode (e.g., +48V input and
+5V output)
Nonisolated, Level-Shifted
Feedback Mode (e.g.,
-48V input and +5V output)
Isolated Feedback Mode
(input and output supplies
isolated from one another)
*Default setting
SWITCH/
JUMPER
SW1
SW2
JU1
SW1
SW2
JU1
SW1
SW2
JU1
POSITION
NON
DIR
Closed*
(default trace)
NON
LVL
Open (Cut)
ISO
LVL
Open (Cut)
3) Verify that switch SW1 is set to the NON position and
SW2 is set to the DIR position. See Table 1 for a de-
scription of the switch settings.
4) Turn on the power and verify that the output voltage
is +5V.
5) Refer to the Isolated Feedback section to modify the
board for isolated operation. Refer to the Nonisolated
Level-Shifted Feedback section to modify the board
for operation with the input and output negative sup-
plies at different potentials.
Detailed Description
Feedback Mode Selection
Switch SW1 selects the feedback configuration (isolat-
ed or nonisolated). If SW1 is set to the NON position,
switch SW2 selects either direct feedback (for the case
in which the input and output share the same ground)
or level-shifted feedback. Switch SW2 is only effective
when nonisolated feedback is selected. Jumper JU1
determines whether the input and output ground refer-
ences are connected. Table 1 summarizes switch and
jumper functions. Do not operate switches SW1 and
SW2 when power is applied to the EV kit because
the controller can be damaged.
Isolated Feedback
To configure the MAX5003 EV kit for isolated operation,
turn off the power supply and cut the JU1 PC board
trace. Set the SW1 switch to the ISO position, and set
the SW2 switch to the LVL position (setting SW2 to the
2 _______________________________________________________________________________________
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