DC2141A Datasheet DC2141A | P1-P3

dc2141af

DEMO MANUAL DC2141A

DESCRIPTION

LTM4647

30A DC/DC Step-Down

µModule Regulator

Demonstration circuit 2141A features the LTM

4647EY,

a 30A high efficiency, switch mode step-down power

µModule regulator. The input voltage range is from 6V to

15V. To use DC2141A for input voltage range from 4.7V to

6V, connect INTVCC to SVIN (change R22 from OPT to 0Ω),

DRVCC to VIN (change R21 from 0Ω to OPT, R28 from OPT

to 0Ω). The output voltage range is 0.6V to 1.8V. Derating

is necessary for certain VIN, VOUT, frequency and thermal

conditions. The DC2141A offers the TRK/SS pin allowing

the user to program output tracking or soft-start period. The

board operates in continuous conduction mode in heavy

load conditions. For high efficiency at low load currents,

the MODE_PLLIN jumper selects pulse-skipping mode for

noise sensitive applications or Burst Mode

operation in

L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

BOARD PHOTO

less noise sensitive applications. The MODE_PLLIN pin

also allows the LTM4647 to synchronize to an external

clock signal (between 400kHz and 800kHz). DC2141A

has the option of choosing both internal and external

compensation circuit for LTM4647. Tying the PHASMD

pin to different voltage generates certain phase difference

between MODE_PLLIN and CLKOUT. The LTM4647 data

sheet must be read in conjunction with this demo manual

prior to working on or modifying demo circuit DC2141A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2141A

dc2141af

DEMO MANUAL DC2141A

QUICK START PROCEDURE

Demonstration circuit 2141A is an easy way to evaluate the

performance of the LTM4647EY. 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

application:

MODE RUN

CCM ON

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

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

and V

supply to 12V.

3. Turn on the power supply at the input. The output volt

age should be 1.0V ±1.0% (0.99V to 1.01V).

4. Vary the input voltage from 6V to 15V and adjust the

load current from 0A to 30A. Observe the output volt

age regulation, ripple voltage, efﬁciency, and other

parameters.

5. (Optional) For optional load transient test, apply an

adjustable pulse signal between IOSTEP_CLK and GND

test points. The pulse amplitude sets the load step cur

rent amplitude. Keep the pulse width short (<1ms) and

pulse duty cycle low (<5%) to limit the thermal stress

on the load transient circuit.

6. (Optional) LTM4647 can be synchronized to an external

clock signal. Place the JP1 jumper on EXT_CLK and

apply a clock signal (0V to 5V, square wave) on the

MODE_PLLIN test point.

PERFORMANCE SUMMARY

Specifications are at T

= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 6 15 V

Output Voltages R

= 90.9kΩ 1.0 ±1.0% V

Maximum Continuous Output Current Derating Is Necessary for Certain Operating Conditions.

See Data Sheet for Details

30 ADC

Operating Frequency R

FREQ

= 47.5kΩ 600 kHz

Efficiency V

= 12V, V

OUT

= 1.0V, I

OUT

= 30A 86.2 Figure 2 %

Load Transient V

= 12V, V

OUT

= 1.0V, I

STEP

= 5A to 20A 153 Figure 3 mV

dc2141af

DEMO MANUAL DC2141A

QUICK START PROCEDURE

Figure 1. Measurement Set-Up of DC2141A

–

LOAD

–

P1-P3 P4-P6 P7-P8

DC2141A

Mfr. #:

Buy DC2141A

Manufacturer:

Analog Devices Inc.

Description:

Power Management IC Development Tools LTM4647 Demo Board - 30A DC/DC Step-Down

Lifecycle:

New from this manufacturer.

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DC2141A