LTM4700EY datasheet(2/20 Pages) AD

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DEMO MANUAL

DC2784B-A

Rev. 0

QUICK START PROCEDURE

Table 1. LTM4700 Demo Boards for Up to 400A Point-of-Load

Regulation

MAXIMUM

OUTPUT

CURRENT

NUMBER

OUTPUTS

NUMBER OF LTM4700

µModule REGULATORS

ON THE BOARD

DEMO BOARD

NUMBER

50A

DC2702A-A

100A

DC2702A-B

200A

DC2784B-A

300A

DC2784B-B

400A

DC2784B-C

Demonstration circuit 2784B-A is easy to set up to evalu-

ate the performance of the LTM4700EY. Refer to Figure 2

for the proper measurement equipment setup and follow

the procedure below.

1. With power off, connect the input power supply to VIN

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

2. Connect the 1.0V output load between VOUT and GND

(initial load: no load).

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

jumper position: JP1: ON; JP2: ON; JP3: ON.

4. Turn on the input power supply and check for the

proper output voltages. VOUT should be 1.0V ±0.5%.

5. Once the proper output voltages are established,

adjust the loads within the operating range and ob-

serve the output voltage regulation, ripple voltage and

other parameters.

6. Connect the dongle and control the output voltages

from the GUI. See “LTpowerPlay GUI for the LTM4700

Quick Start Guide” for details.

NOTE: Internal bias circuit is enabled when VIN > 7V and

JP3 is ON.

NOTE: When measuring the output or input voltage rip-

ple, 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.

PERFORMANCE SUMMARY Specifications are at T

A = 25°C

PARAMETER

CONDITIONS

MIN

TYP

MAX

VALUE

Input Voltage Range

4.5

Output Voltage, VOUT

VIN = 4.5V to 16V, IOUT = 0A to 200A

0.5

1.0

1.8

Maximum Output Current, IOUT

VIN = 4.5V to 16V, VOUT = 0.5V to 1.8V

200

Typical Efficiency

VIN = 12V, VOUT = 1.0V, IOUT = 200A

88.7 (See Figure 5)

Default Switching Frequency

350

kHz

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