Linear Technology DC627A-A Manuale utente

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 627

BOOST CONVERTER

LT3461 / LT3461A

DESCRIPTION

Demonstration circuit 627 features the LT3461 /

LT3461A in a 12.0V output boost converter which

operates from an input voltage of 3V to 6V. The

maximum output current is 70mA when powered

from a 5.0V input and 40mA when powered from a

3.3V input. A soft-start option is provided by the

SHDN pin and can be configured with an on-board RC

filter.

The internal schottky of the LT3461 / LT3461A re-

duces part count and the high switching frequency

allows the use of a small SMT inductor and output

capacitors. The small size of the circuit makes it ideal

for space-sensitive applications.

The DC627A comes in two versions. The “-A” version

uses the LT3461 and the “-B” version uses the

LT3461A.

Design files for this circuit board are available. Call

the LTC factory.

LT is a trademark of Linear Technology Corporation

Table 1.

Performance Summary (TA= 25°C)

PARAMETER CONDITION DC627A-A

VALUE

DC627A-B

VALUE

LT Part LT3461ES6 LT3461AES6

Minimum Input Voltage 3V 3V

Maximum Input Voltage 6V 6V

Output Voltage VOUT V

IN = 3V to 6V 12V ±4% 12V ±4%

Maximum Output Current VIN = 3.3V

VIN = 5.0V

40mA

70mA

40mA

70mA

Typical Efficiency VIN = 3.3V, IOUT = 40mA

VIN = 5.0V, IOUT = 70mA

79%

83%

76%

81%

Typical Output Voltage Ripple

(20MHz BW)

VIN = 3.3V, IOUT = 40mA

VIN = 5.0V, IOUT = 70mA

20mVP–P

28mVP–P

9mVP–P

12mVP–P

Nominal Switching Frequency 1.3MHz 3.0MHz

QUICK START PROCEDURE

Demonstration circuit 627 is easy to set up to evalu-

ate the performance of the LT3461 or LT3461A. Refer

to Figure 1 for the proper measurement equipment

setup and follow the procedure below:

Place jumper JP1 in the “ON” position if not al-

ready done.

With power off, connect the input power supply.

Turn on the input power source and set it to 3.3V.

The output should be 12.0V ±4% at no load.

Connect the load from VOUT to GND and set to

40mA. The output should still be 12.0V ±4%.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 627

BOOST CONVERTER

Increase the input voltage to 5.0V and apply 70mA

load and re-check regulation.

Measure the DC input current at VIN = 5.0V and

IOUT = 70mA.

For the DC627A-A, the input current should be

less than 215mA.

For the DC627A-B, the input current should be

less than 225mA.

Monitor the output voltage ripple. Refer to Figure 2

for the proper measurement technique.

Measure the output ripple frequency.

For the DC627A-A, the frequency should be be-

tween 1.0MHz and 1.7MHz.

For the DC627A-B, the frequency should be be-

tween 2.1MHz and 3.9MHz.

NOTE:

If this circuit will be used in a hot plug applica-

tion, then be sure to measure the inrush current. The

maximum non-repetitive surge current the internal

schottky can handle is 1.5A. The inrush current can

be monitored by measuring the current through the

inductor when VIN is initially applied. Refer to the data

sheet for more details.

Figure 1.

Proper Measurement Equipment Setup

Figure 2.

Measuring Input or Output Ripple

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 627

BOOST CONVERTER

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