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MAX8536 Evaluation Kit
Component Suppliers
SUPPLIER
Fairchild Semiconductor
Taiyo Yuden
PHONE
888-522-5372
800-348-2496
www.fairchild.com
www.t-yuden.com
WEBSITE
TDK Corp. 847-803-6100 www.component.tdk.com
Note: Indicate that you are using the MAX8536 when contacting these component suppliers.
Quick Start
The EV kit is a fully assembled and tested surface-
mount board. Follow the steps below for simple board
operation. Caution: Do not turn on the power supply
until all connections are completed.
1) Verify that a shunt is connected across pins 1-2 of
jumper JU1 (TIMER function set to 250kHz).
2) Connect the positive terminal of a 5V power supply
to the PS_OUT+ banana jack. Connect the ground
terminal of this power supply to the PS_OUT-
banana jack.
3) Connect a voltmeter across the VBUS+ and VBUS-
terminals.
4) Connect an oscilloscope to TP1 on the EV kit.
5) Connect a voltmeter or an oscilloscope to the
FAULT pad to capture the fault signal.
6) Turn on the 5V power supply connected across the
PS_OUT+ and PS_OUT- banana jacks.
7) Verify that the voltmeter at VBUS+ measures 5V and
TP1 measures approximately 10.5V with respect to
the GND PCB pad.
8) Verify that FAULT measures approximately 5V.
9) The EV kit is ready to interface with a system for fur-
ther testing.
Detailed Description
The MAX8536 EV kit circuit demonstrates the functionali-
ty of the MAX8536 ORing MOSFET controller that pro-
vides redundancy and fault isolation to highly reliable
power systems. The EV kit can handle up to 20A of
throughput current and can operate in 5V and 3.3V
power systems. The EV kit is configured for 5V operation.
During startup, the EV kit monitors the voltage differ-
ence between a power supply connected at PS_OUT+
and the power-bus VBUS+. Once the voltage drop is
less than the internal threshold of 0.4V (typ) and the
PS_OUT+ voltage is greater than the undervoltage
threshold, the IC controller turns on N1 and N2. Turning
on the MOSFETs allows current to flow from PS_OUT+
to VBUS+ and vice versa. Once both MOSFETs are
turned on, the EV kit continuously monitors the load to
protect against undervoltage, overvoltage, and reverse-
current fault conditions. The IC controller uses the
R DS(ON) resistance of both MOSFETs to monitor for-
ward- and reverse-current conditions. During undervolt-
age, overvoltage, or reverse-current fault conditions, a
logic low is asserted on the FAULT output, and both
MOSFETs are turned off to isolate PS_OUT+ from
VBUS+.
The overvoltage protection (OVP) and the undervoltage
protection (UVP) thresholds are adjustable and can be
disabled. The UVP threshold is set to 2.9V and the OVP
threshold is set to 5.75V. A FAULT signal output is pro-
vided for circuit monitoring. N1 can be shorted if OVP is
disabled.
Input Voltage
The EV kit requires an input voltage of 4.5V to 5.5V con-
nected across PS_OUT+ and PS_OUT- for normal oper-
ation. The IC controller starts to function when the input
voltage exceeds the internal undervoltage lockout
(UVLO) threshold of 2.7V (typ), but it continues to hold
the GATE pin low to isolate the power supply from the
live power bus until the programmed undervoltage
threshold of 2.9V is exceeded. Once the input voltage
exceeds the UVP threshold and the voltage difference
between PS_OUT+ and VBUS+ is less than 0.4V (typ),
the controller turns on the ORing MOSFETs N1 and N2
to connect the power supply to the power bus without
disturbing the power bus.
GATE Drive
The GATE pin on the IC controller is the output of the
internal charge pump that provides the necessary gate
drive for both N1 and N2 on the EV kit. The GATE volt-
age can be monitored with an oscilloscope connected to
TP1 on the EV kit board and should read 5.5V (typ)
above the PS_OUT+ voltage. During startup, the GATE
voltage ramp-up time is determined by the charge-pump
frequency that is programmed by the TIMER pin. The
input impedance of the measuring instrument can
decrease the voltage reading at TP1 (typically 220mV for
2
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