input DC bus to ground can be used to divide down and apply a fraction of the input DC

voltage to the EN/UVLO pin. The values of the resistor divider can be selected so that the

EN/UVLO-pin voltage exceeds the 1.21V (typ) turn-on threshold at the desired input DC

bus voltage. The same resistor divider can be modified with an additional resistor, R , to

implement overvoltage input protection in addition to the EN/UVLO functionality. When the

voltage at the OVI pin exceeds 1.21V (typ), the MAX17596 stops switching. Switching

resumes with soft-start operation, only if the voltage at the OVI pin falls below 1.15V (typ).

For the expected values of the startup DC input voltage (V

) and overvoltage-input

protection voltage (V ), the resistor values for the divider can be calculated as follows:

V

= (R65 + R6 + R7)/(R6 + R7) × 1.21 (V)

V= (R5 + R6 + R7)/R7 × 1.21 (V)

If R5 = 274kΩ, R6 = 11.3kΩ, and R7 = 9.76kΩ, then:

V

= 16.95V, V

= 36.6V.

Quick Start

Required equipment:

• MAXREFDES112# board

• One 24V DC power supply

• One electronic load

•1 voltmeters

• 1 ammeters

Procedure

The MAXREFDES112# board is fully assembled and tested. Use the following steps to

verify board operation.

1. Turn off the power supply.

2. Connect the positive terminal of the power supply to the VIN pin of the

MAXREFDES112# board.

3. Connect the negative terminal of the power supply to the GND pin of the

MAXREFDES112# board.

4. Connect the VOUT connector of the MAXREFDES112# board to the positive

terminal of the electronic load.

5. Connect the negative terminal of the electronic load to the positive terminal of the

ammeter.

6. Connect the negative terminal of the ammeter to the GNDO connector of the

MAXREFDES112# board.

7. Connect the voltmeter across the VOUT and the GNDO connectors of the

MAXREFDES112# board.

OVI

START

OVI

START

OVI

START

OVI