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dc2161af

DEMO MANUAL DC2161A

DC2161A contains 3 jumpers. A description of each

jumper follows.

JP1,UV/OV.Thisjumperselectswhetherornotundervolt-

age or overvoltage lockout is enabled. When the jumper

is in the disable position, a UV or OV condition will not

block operation of the Hot Swap Controller. The default

is ENABLE.

JP2, IQ. The LTC4231 is a low power device, meaning it

draws very little current to perform its function. Any board

leakageontheGATEpincausedbyboardcontaminationor

adefectiveMOSFETwillcausethiscurrenttoincrease.JP2,

whenintheMEASUREIQposition,facilitatesmeasurement

of the quiescent current of the LTC4231 exclusive of the

current of other components on the board, such as LED

OPERATING PRINCIPLES

D2, output coupling capacitor C3, TVS diode D1, capacitor

C1, voltage divider R6, R7, R8 and R9, or any leakage on

the board. This current is measured via a microammeter

connected between turret E7 and GND. If the MEASURE IQ

position is selected, verify a microammeter is connected

and the gate of the MOSFETs. The default position for JP2

is NORMAL.

JP3, ENABLE. This jumper either enables or disables the

output or provides external control of the output. This is

provided by the ON pin of the LTC4231. When in the ON

the ON pin is connected via a 100kΩ resistor from turret

E9 to the ON pin of the LTC4231. A logic 1 on this pin will

The LTC4231 is a Micropower Hot Swap Controller that

has a 2.7V to 36V operating range and a –40V to 40V ab-

solute maximum voltage for the IN pin. This demo circuit

is populated for +12V operation, but it can easily be re-

adjusted for any voltage between 2.7V and 36V by replac-

ing R6, R7, R8, and R9 in the UVL, UVH, and OV divider

string. These values should be selected using guidelines

suggested in the LTC4231 data sheet to minimize current

drain. The DC2161A is populated with a Si7960DP dual

MOSFET with one section used as a pass MOSFET and the

other section used for reverse voltage protection. It also

has a 15mΩ sense resistor. This combination provides

an output current of 3A. Pads are provided on the PCB

for external MOSFET and sense resistor connections for

other voltages and currents.

JUMPERS