MAX5943AEVKIT Maxim Integrated, MAX5943AEVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX5943AEVKIT
• Description: Power Management IC Development Tools Evaluation Kit for the MAX5943A/B/C/D/E
• Manufacturer: Maxim Integrated
• Series: MAX5943r

The MAX5943A EV kit is a fully assembled and tested
surface-mount board. Follow the steps below for simple
board operation. Do not turn on the power supply
until all connections are completed.
1)
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10) The EV kit is ready for further testing.
The MAX5943A EV kit circuit demonstrates the ORing
and hot-swap current-limiting functions of the
MAX5943A controller. The MAX5943A controls two
n-channel MOSFETs (in a single SO-8 package) to
implement current regulation between the input power
source and the load. The MAX5943A implements the
low-drop ORing function that is commonly used for
power-supply redundancy and fault isolation in highly
reliable power systems. The MAX5943A EV kit board is
MAX5943A Evaluation Kit
Note: Indicate that you are using the MAX5943A when contacting these component suppliers.
2
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_______________________________________________________________________________________
Verify that shunts are not installed across jumpers
JU1 (overcurrent timeout period = 2ms), JU2
(autoretry mode), and JU3 (ORing function
enabled).
Verify that shunts are installed across pins 2 and 3
of jumpers JU4 (ORing voltage threshold V
5mV) and JU5 (output current limit = 1.6A).
Connect a voltmeter across the OUT and GND
banana jacks.
Connect the positive terminal of a 7.5V to 37V
power supply to the IN banana jack. Connect the
ground terminal of this power supply to the GND
banana jack.
Set the power supply to 18V.
Connect a voltmeter or an oscilloscope to the
FAULT pad to capture fault signals.
Turn on the power supply.
Verify that the voltmeter connected to the OUT
output terminals measures approximately 17.5V.
Verify that FAULT measures approximately 18V.
SUPPLIER
Detailed Description
Quick Start
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—
OR
=
designed to operate in 7.5V to 37V IEEE 1394/FireWire
systems.
During a startup cycle, the two n-channel MOSFETs on
the EV kit are off until the input voltage exceeds the inter-
nal 6.5V (typ) and the programmed 1.24V (typ) ON
undervoltage lockout thresholds. Once the input voltage
exceeds the two input thresholds, the MAX5943A con-
troller keeps MOSFET N1-A off to prevent back charge
from the output and slowly enhances the gate of MOSFET
N1-B to ramp the output current. When the voltage
across sense resistor R1 exceeds the programmed
ORing voltage, V
MOSFET N1-A. After MOSFETs N1-A and N1-B have
been turned on, the controller continues to monitor the
output current. If the output current exceeds the pro-
grammed current-limit threshold, the controller lowers the
gate voltage of MOSFET N1-B to regulate the output cur-
rent at the limit. If the output current is not lowered to the
programmed threshold within the timeout period, the
controller turns off MOSFETs N1-A and N1-B and asserts
a logic low on the FAULT output PC board pad to signal
an overcurrent fault condition.
The MAX5943A EV kit features several jumpers to pro-
gram the output current limit, current-limit timeout peri-
od, and ORing voltage thresholds. The fault-manage-
ment function can also be programmed to autoretry or
latch mode by configuring on-board jumpers. The ON
undervoltage lockout threshold can be configured by
installing resistors on the EV kit board. Shutdown mode
can be controlled by an on-board switch or with an
external logic signal.
The MAX5943A EV kit operates from a 7.5V to 37V input
source connected across IN and GND terminals. The
input source must be able to deliver 2.5A of current to
the EV kit. The MAX5943A EV kit controller starts to
function when the input voltage exceeds the IN default
undervoltage lockout voltage threshold of 6.5V (typ)
and the ON undervoltage lockout threshold.
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FAX
—
OR
threshold, the MAX5943A turns on
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