LTC4368 datasheet(3/6 Pages) LINER

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dc2418af

DEMO MANUAL DC2418A

QUICK START PROCEDURE

DC2418A is easy to set up to evaluate the performance of

LTC4368. Refer to Figure 1 and Figure 2 for proper mea-

surementequipmentsetupandfollowtheprocedurebelow.

Reverse Voltage Protection Test

1. Set JP1 to EN.

2. Set JP2 and JP3 to CONNECT LED.

3. ConnectapowersupplyacrossVINandGNDinnegative

configuration (connect its positive terminal to GND and

negative to VIN).

4. Connect a power supply across VOUT and GND and set

to 0V.

5. Connect the ammeters in series with VIN and VOUT.

6. Slowlyrampsupplydownto–40V(referencedtoGND).

Make sure this voltage does not exceed –40V.

7. Verify all LEDs are off, input current is <3µA and output

current is <100µA.

8. Ramp supply back to 0V.

Undervoltage/Overvoltage Protection Test

1. Reversethepolarityofpowersupplyconnectionacross

VIN to GND (connect supply’s positive terminal to VIN

and negative to GND).

2. Slowly ramp supply up to 100V and verify that green

VIN LED and red FAULT LED light up, but green VOUT

LED does not light up.

3. Ramp supply down from 60V to 0V and verify green

VIN LED, red FAULT LED, green VOUT LED, and VOUT

operate according to the following table.

VIN

VOUT

VIN LED

VOUT LED

FAULT LED

0V to 3.5V

Off/Dim/On

Off

3.5V to 18V

VIN

Off

18V to 60V

Off

Forward Overcurrent Protection Test

1. Place JP1 in position DIS and JP2 and JP3 in position

CONNECT LED.

2. Connect +5V supply to VIN.

3. Enable LTC4368 by changing the position JP1 to EN.

Confirm that output voltage is +5V.

4. Load the DC2418A-A board output with 0.4Ω (25W)

resistor or DC2518A-B board with 1.5Ω. Confirm that

the output load is disconnected from power. The load

should be placed between the VOUT and GND turrets.

5. Repeat steps 3 and 4 with a 7.8A load for DC2418A-A

and a 1.9A load for DC2418A-B. Confirm that the output

is not disconnected (VOUT should be close to VIN and

not at ground).

Jumper Test

1. Remove the load and set the VIN supply to 9V.

2. Move jumpers and verify LEDs light up according to

table below.

JP1

JP2/JP3

VIN LED

VOUT LED

CONNECT LED

DIS

CONNECT LED

Off

OPEN

Off

Jumpers

JP1: (SHDN) Enable (EN) or Disable (DIS) Controller.

JP2: (VIN) Power or unpower LEDs, green D1 and red D3.

JP3: (VOUT) Power or unpower green LED D2.

JP4:(COOL-DOWN-TIME)Selectcool-downtime1320ms,

120ms, or place controller in latch-off operation.

LEDs

D1: Indicates input voltage is present.

D2: Indicates output voltage is present.

D3: Indicates FAULT pin signal (a fault turns on this LED).

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