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dc1506af
DEMO MANUAL DC1506A
QUICK START PROCEDURE
OPERATION
The DC1506A is used to evaluate the LTC4361 in three
protection configurations selected at JP1. The device in
need of protection is connected to one of the three OUT test
points or to the USB output connector J2. An input supply
is connected at V
IN
or a USB source is connected at J1.
ON
Control
The
ON
pins on each of the three LTC4361s are tied together
and controlled at JP2. Select ENABLE to enable the selected
protection, or DISABLE to enter a low current sleep mode.
Protection (A) OV/OC
The first selection at JP1 is protection (A) OV/OC which
protects against overvoltage and overcurrent. The LTC4361
turns on a single N-channel MOSFET when the input volt-
age is below the overvoltage threshold. A Kelvin sense to
the sense resistor in series with the power path provides
overcurrent detection. In the case of an overcurrent, the
LTC4361-1 used in protection (A) latches off and requires
a power cycle to turn the MOSFET back on. An amber
input LED indicates if the input supply is on while a green
OUT(A) LED indicates the gate is on and the input is passed
over to the output.
Protection (B) OV/OC/NV
The second selection at JP1 is protection (B) OV/OC/NV
which protects against overvoltage, overcurrent and nega-
tive voltage. The LTC4361 turns on an N-channel MOSFET
when the input voltage is below the overvoltage threshold.
A P-channel MOSFET is driven by the GATEP pin of the
LTC4361 to protect the output against an inadvertent
negative voltage connection at the input. A Kelvin sense to
the sense resistor in series with the power path provides
overcurrent detection. In the case of an overcurrent, the
LTC4361-2 used in protection (B) automatically retries to
turn the MOSFET back on. The amber V
IN
LED indicates if
the input supply is on while a green OUT(B) LED indicates
the gate is on and the input is passed over to the output. A
red –V
IN
LED indicates if a negative input voltage is present.
Protection (C) OV/OC/NV/RC
The third selection at JP1 is protection (C) OV/OC/NV/RC
which protects against over voltage, overcurrent, nega-
tive voltage and reverse current. The LTC4361 turns on
back-to-back N-channel MOSFETs when the input voltage
is below the overvoltage threshold. The back-to-back
N-channel MOSFETs blocks reverse current feeding in to
the input. A P-channel MOSFET is driven by the GATEP pin
of the LTC4361 to protect the output against an inadvertent
negative voltage connection at the input. A Kelvin sense to
the sense resistor in series with the power path provides
overcurrent detection. In the case of an overcurrent, the
LTC4361-1 used in protection (C) latches off and requires
a power cycle to turn the MOSFET back on. The amber
V
IN
LED indicates if the input supply is on while a green
OUT(C) LED indicates the gate is on and the input is passed
over to the output. The red –V
IN
LED indicates if a negative
input voltage is present.
USB Protection
DC1506A also provides connection for USB protection.
First connect a USB device with a USB cable at J2. Select
the protection type at JP1 and match this with JP3. Select
ENABLE at JP2. The USB source can then be connected
at J1.
