Analog Devices DC336 Manual de usuario

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DC336 QUICK START GUIDE

Description

Demonstration circuit DC336 is a white LED driver using the LTC3200 low noise, constant

frequency, inductorless DC/DC converter. The circuit is designed to drive five white LEDs from

a single Li-Ion cell. The LTC3200’s 2MHz constant switching frequency and internal switching

control result in extremely low input and output ripple and small circuit size (23mm2). DC336 is

specifically targeted for white LED backlight applications in cellular phones and small handheld

devices, such as PDAs, where noise and circuit size are critical. The input ripple and output

ripple performance can be improved by using 4.7µF, X7R ceramic capacitors at the input and

output (refer to the LTC3200 data sheet). Gerber files for this circuit board are available. Call the

LTC factory.

Quick Start

DC336 is easy to set up to evaluate the LTC3200 low noise, LED driver circuit. Refer to Figure 1

for equipment setup and follow the procedure outlined below:

1. Before turning on the power supply, connect a 3.3V, 500mA bench supply to the VIN and GND

terminals.

2. Turn on the input power supply and observe that the white LEDs light up. The output voltage

should measure 5V (typical) with 3V–4.2V input voltage.

3. Connect the JP1 jumper to the “off” position to turn off the LTC3200. Returning the jumper to

the “on” position will turn on the LTC3200.

+

–

+

–

VIN

GND

SHDN

VOUT

GND

JP1 ] OFF

] ON

LTC3200ES6

White LED Driver for Cellular Phone

Demo Circuit DC336A

POWER

SUPPLY

Figure 1. DC336A Test and Measurement Setup

4. When measuring the input / output voltage ripple, care must be taken to avoid a long ground

return for the oscilloscope probe. After removing the grabber and outer plastic sleeve from the

scope probe, measure the input voltage ripple by touching the probe between VIN and GND

and measure the output voltage ripple by touching the probe between VOUT and GND as

shown in Figure 2.

VIN

GND

VOUT

GND

MEASURING

V

IN

RIPPLE

MEASURING

V

OUT

RIPPLE

TEKTRONIX

TDS 640A

OSCILLOSCOPE

PROBE

Figure 2. Proper Noise Measurement Technique