MAX1856EVKIT Maxim Integrated, MAX1856EVKIT Datasheet - Page 2
MAX1856EVKIT
Manufacturer Part Number
MAX1856EVKIT
Description
Power Management IC Development Tools Evaluation Kit for the MAX1856
Manufacturer
Maxim Integrated
Series
MAX1856r
Datasheet
1.MAX1856EVKIT.pdf
(5 pages)
MAX1856 Evaluation Kit
SLIC Power Supply
Note: Please indicate that you are using the MAX1856 when
contacting these component suppliers.
2
DESIGNATION
AVX
Central Semiconductor
Coiltronics
Dale Electronics Inc.
ICE Components
International Rectifier
IRC
Murata
Sanyo USA
Taiyo Yuden
_______________________________________________________________________________________
R2, R3
R4, R5
None
None
None
None
R10
R11
R12
R13
JU1
N1
U1
SUPPLIER
R1
R6
R7
R8
R9
Component List (continued)
QTY
1
1
0
2
1
1
1
1
1
1
1
0
1
1
1
1
1
1
Component Suppliers
DESCRIPTION
3.8A, 55V, N-channel MOSFET
(SOT223)
International Rectifier IRLL2705
200Ω ±5% resistor (2512)
Not installed
10Ω ±5% resistors (1206)
0.033Ω ±1% resistor (2010)
IRC LRC-LRF2010-01-R033-F or
Dale WSL 2010 0.033Ω 1%
100Ω ±5% resistor (0805)
200kΩ ±1% resistor (0805)
5.11kΩ ±1% resistor (0805)
681kΩ ±1% resistor (0805)
174kΩ ±1% resistor (0805)
100kΩ ±5% resistor (0805)
Not installed
MAX1856EUB (10-pin µMAX)
2-pin header
Shunt (JU1)
MAX1856 PC board
MAX1856 data sheet
MAX1856 EV kit data sheet
803-946-0690
631-435-1110
561-241-7876
650-526-8333
703-257-7740
310-322-3331
650-367-9000
814-237-1431
619-661-6835
408-573-4150
PHONE
803-626-3123
631-435-3388
561-241-9339
650-965-1644
703-257-7547
310-322-3332
650-367-7158
814-238-0490
619-661-1055
408-573-4159
FAX
The MAX1856 EV kit is fully assembled and tested.
Follow these steps to verify board operation. Do not turn
on the power supply until all connections are com-
pleted:
1) Verify that a shunt is across pins 1 and 2 of jumper
2) Connect a voltmeter to the VOUT1 pad.
3) Connect a +8V to +24V DC power supply to the VIN
4) Connect the supply ground to the GND pad.
5) Turn on the power supply and gradually increase
6) Verify that VOUT1 is -72V throughout the +8V to
7) Verify that VOUT2 is -24V throughout the +8V to
Note: Exercise caution when measuring the -72V.
For instructions on reconfiguring VOUT1 to -48V,
see Evaluating -48V Output.
The MAX1856 EV kit is an inverted flyback DC-DC con-
verter configured for two output voltages simultaneous-
ly. The transformer has a 1:2:2:2 turns ratio. The sec-
ondary has three taps to provide three different ratios of
1:2, 1:4, and 1:6. VOUT1 is connected to the 1:6 tap,
providing -72V, which can supply up to 100mA. VOUT2
is connected to the 1:2 tap, providing -24V, which can
supply up to 400mA. VOUT1 may be connected to the
1:4 tap to provide -48V and supply up to 200mA. The
input voltage can range from +8V to +24V. The output
voltage is determined by the following equation:
where (N2 / N1) is the secondary/primary turns ratio of
the transformer, and D is the duty cycle of the pulse-
width-modulating (PWM) switching signal.
For a fixed turns ratio, the duty cycle (D), will vary to
compensate for the variation in V
stant output voltage.
For example, for (N2 / N1) = 6:1, as V
to +24V, D will vary from 60% to 33% to keep V
constant at -72V.
JU1 (SYNC/SHDN).
pad, with the voltage set to 0.
the input voltage through the +8V to +24V range.
+24V input voltage range.
+24V input voltage range.
|
V
OUT
|
= V
IN
Output VOUT1 and VOUT2
Detailed Description
x (N2 / N1) x D/(1 - D)
IN
Quick Start
to maintain a con-
IN
varies from +8V
OUT