2

dc2066af

DEMO MANUAL DC2066A

Quick start proceDure

Table 2. LTM4677 Demo Boards for Up To 140A Point-of-Load Regulation

MAXIMUM OUTPUT CURRENT

NUMBER OF OUTPUTS

NUMBER OF LTM4676

µMODULE REGULATORS ON THE BOARD

DEMO BOARD NUMBER

Dual 18A

2

1

DC2066A

70A

1

2

DC2143A-A

105A

1

3

DC2143A-B

140A

1

4

DC2143A-C

6. Once the proper output voltages are established, adjust

the loads within the operating range and observe the

output voltage regulation, ripple voltage and other

parameters.

7. Connect the dongle and control the output voltages

from the GUI. See “

LTpowerPlay GUI for the LTM4677

Quick Start Guide” for details.

Note: When measuring the output or input voltage ripple,

do not use the long ground lead on the oscilloscope probe.

See Figure 3 for the proper scope probe technique. Short,

stiff leads need to be soldered to the (+) and (–) terminals

of an output capacitor. The probe’s ground ring needs to

touch the (–) lead and the probe tip needs to touch the

(+) lead.

Demonstration circuit 2066A is easy to set up to evaluate

the performance of the LTM4677EY. Refer to Figure 2 for

the proper measurement equipment setup and follow the

procedure below.

(4.5V to 16V) and GND (input return).

(Initial load: no load).

(Initial load: no load).

4. Connect the DVMs to the input and outputs. Set default

jumper position: SW1: ON; SW2: ON.

5. Turn on the input power supply and check for the proper

should be 1.8V ±1%.

performance summary

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

4.5

16

V

0.5

1.8

V

18

A

0.5

1.8

V

18

A

Typical Efficiency

87.9

(See Figures 5 and 6)

%

Default Switching Frequency

500

kHz