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dc1743af

DEMO MANUAL DC1743A

qUick stArt proceDUre

Demonstration circuit DC1743A is an easy way to evalu-

ate the performance of the LTM4613EV. Please refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below:

1. Place jumpers in the following positions for a typical

3.3VOUT application:

MODE

MARG1

MARG0

VOUT SELECT

RUN

CCM

LO

LO

3.3V

ON

2. With power off, connect the input power supply, load

and meters as shown in Figure 1. Preset the load to 0A

and VIN supply to be 0V.

3. Turn on the power at the input. Increase VIN to 12V

(do not hot-plug the input supply or apply more than

the rated maximum voltage of 36V to the board or the

part may be damaged). The output voltage should be

regulated and deliver the selected output voltage ± 2%.

4. Vary the input voltage from 5V to 36V and adjust the

load current from 0A to 8A. Observe the output voltage

regulation, ripple voltage, efficiency, and other param-

eters.

5. To measure input or output ripple, insert the scope

probe to J7 or J4.

6. Foroptionalloadtransienttest,applyanadjustablepulse

signal between IOSTEP_CLK and GND test points. The

pulse amplitude sets the load step current amplitude.

The pulse duty cycle should be low (< 5%) to limit the

thermal stress on the load transient circuit. The load

step current can be monitored with a BNC connected

to J3 (20mV/A). The output voltage can be monitored

at the probe jack J4.