DC2161A-A Datasheet DC2161A-A, DC2161A-B | P1-P3

dc2161af

DEMO MANUAL DC2161A

DESCRIPTION

LTC4231 Micropower

Hot Swap Controller

Demonstration circuit 2161A showcases the LT C

4231

Micropower Hot Swap

™

Controller in a 12V, 3A applica-

tion. Included on

the board are input overvoltage and

reverse voltage protection, input voltage dividers for UV

and OV detection, an output voltage LED, jumpers to

disable UV/OV, manual and remote enable control, and

quiescent current measurement. There are turrets provided

to monitor input voltage, output voltage, output status,

quiescent current, several ground connections, timer pin,

and control the ON pin. Input, output and return voltages

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot

Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of

their respective owners.

are provided on banana jacks. The DC2161A-A version is

used to demonstrate the LTC4231-1 which remains off

after a current fault, while the DC2161A-B demonstrates

the LTC4231-2 which automatically reapplies power after

a cool-down period.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2161A

Table 1

PARAMETER CONDITIONS VALUE

Input Supply Voltage Range Limited by Transient Surge Protector

–24V to +24V

Nominal Operating Voltage  12V

Overvoltage Lockout Nominal 14.4V

Undervoltage Lockout (Voltage Falling) Nominal 9.6V

Undervoltage Lockout (Voltage Rising) Nominal 10.8V

Output Current Limit  3A

Maximum Load Capacitance  600µF

Timer Expiration Period  2ms

Table 2. Power Input and Output Connections

NOMENCLATURE CONNECTOR DESCRIPTION

VIN 12V J1 12V Input

GND J2 12V Input Return

VOUT 12V, 3A J3 12V Output

GND J4 12V Output Return

Table 3. Test Points

NOMENCLATURE TURRET DESCRIPTION

VIN 12V E1 12V Input Monitor

GND E2, E4,

E6, E8

Ground

VOUT 12V, 3A E3 12V Output Monitor

STATUS E5 Status, Open Drain when Output

Enabled

GND E6 Ground

IQ E7 Quiescent Current Monitor. Use

Microammeter at This Point When JP2

Selects MEASURE IQ.

ON E9 Enable LTC4231 Output. Enables Output

or Selects External Control of Output

TIMER E10 TIMER Pin

PERFORMANCE SUMMARY

Specifications are at T

= 25°C

dc2161af

DEMO MANUAL DC2161A

DC2161A contains 3 jumpers. A description of each

jumper follows.

JP1, UV/OV. This jumper selects whether or not undervolt

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

leakage on the GATE pin caused by board contamination or

a defective MOSFET will cause this current to increase. JP2,

when in the MEASURE IQ position, facilitates measurement

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

to prevent damage to the board via leakage between V

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

position, the 12V V

OUT

is enabled. When in the OFF posi-

tion, the 12

V V

OUT

is disabled. When in the EXT position,

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

enable the 12V V

OUT

. The default position for JP3 is ON.

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 +12

V operation, but it can easily be re-

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

ing R

6, 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

dc2161af

DEMO MANUAL DC2161A

DC2161A is easy to set up to evaluate the performance

of the LTC4231.

Connect a power supply capable of delivering greater than

3.5A of current between 10V and 20V to the V

jack J1

with its return lead connected to GND J2. Monitor the input

voltage at turrets E1 and E2. Place a voltmeter between

turrets E3 and E4. Connect an ammeter between J3 and the

test loads. Connect the return lead of the test loads to jack

J4. The connections are shown schematically in Figure 1.

The active load should be set to provide a resistive load

since the LTC4231 may not start into a constant current

load. With the resistive load set at 5.4Ω, vary the input

voltage from 9V to 17V and from 17V to 9V to check the

UV and OV thresholds.

QUICK START PROCEDURE

Set the input voltage to 12V, vary the load resistance, and

observe output indicator D2. Determine from the ammeter

that the output remains on at 3A (4Ω). The output should

turn off at approximately 3.2A.

Reduce the load resistance to below 4Ω and observe an

auto reset in the DC2161A-B. In the DC2161A-A, power

will have to be removed and then applied to the input to

reset the LTC4231.

Remove the resistive load from the output and replace it

with a 500µF capacitor. Observe the polarity when con

necting the capacitor. Upon application of input voltage,

LED

D2 should illuminate to indicate V

OUT

is present. This

indicates the Hot Swap Controller is capable of starting

into a 500µF capacitor.

Figure 1. Proper Equipment Measurement Set-Up

TEST

LOADS

POWER

SUPPLY

P1-P3 P4-P6

DC2161A-A

Mfr. #:

Buy DC2161A-A

Manufacturer:

Analog Devices Inc.

Description:

Power Management IC Development Tools LTC4231IMS-1 Demo Board - Micropower Hot

Lifecycle:

New from this manufacturer.

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DC2161A-A

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