Linear Technology LTC3214 Manuel utilisateur

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 902

LOW NOISE HIGH CURRENT LED CHARGE PUMP

LTC3214

DESCRIPTION

Demonstration circuit 902 is a low noise high current

LED charge pump featuring the LTC®3214 and a cell

phone camera flash LED. The board has two versions

(-A, -B) that are optimized separately for a short LED

flash current or a lower but constant LED torch cur-

rent with a single lithium ion battery input voltage

range of 2.9V to 4.4V or three AAA batteries in series.

The lithium ion battery input voltage range, high LED

flash current and separate torch mode current setting,

internal charge pump switches, inductorless solution,

minimal external components, and simple design

makes the LTC3214 the top solution for space-

constrained cellular telephone camera flash solutions

with flash current below 500mA. The LTC3214 is very

similar to the LTC3215 and LTC3216, but with lower

maximum flash current of 500mA as opposed to

700mA and 1000mA respectively.

DC902A can be built with three AAA batteries in se-

ries in a battery pack on the back to simulate the ca-

pabilities of a typical lithium ion cellular telephone

battery. The LED is turned on and off by pressing the

LED ON button. Without the FLASH button pressed,

the LED ON button sets the LED current to the

TORCH MODE setting in the schematic. The FLASH

button flashes the LED at higher current as shown in

the schematic for cellular telephone camera flash op-

eration. The FLASH only works when the LED ON but-

ton is also pressed. The FLASH button activates a

MOSFET that places a second ISET resistor in parallel

with the original, raising the LED current. FLASH

MODE is intended to be less than one second long.

Holding down the FLASH button with the LED ON can

damage the LED and potentially damage the IC.

The LTC3214 datasheet gives a complete description

of the part, operation and applications information.

The datasheet must be read in conjunction with this

Quick Start Guide for demonstration circuit 902. In

addition, the datasheets for the two LEDs must be

read in order to understand the thermal and light out-

put specifications of the LEDs. The LTC3214 is as-

sembled in a small low profile DFN package. Proper

board layout is essential for maximum thermal per-

formance. See the datasheet section ‘Layout Consid-

erations’.

Design files for this circuit board are available. Call

the LTC factory.

,LTC and LT are registered trademarks of Linear Technology Corporation.

QUICK START PROCEDURE

Demonstration circuit 902 is easy to set up to evalu-

ate the performance of the LTC3214. Follow the pro-

cedure below:

NOTE:

Make sure that the input voltage does not ex-

ceed 5.5V if a source other than the three AAA batter-

ies is used.

NOTE:

If batteries are not used, do not hot-plug the

input voltage terminals VIN (+) and GND (-). The ab-

solute maximum voltage on VIN is 5.5V and hot-

plugging a power supply through wire leads to the

demonstration circuit can cause the voltage on the

extremely low-ESR ceramic input capacitor to ring to

twice its DC value.

See Application Note 88 for more

details.

Connect 2.9V to 4.4V input power supply to the

VIN and GND terminals on the PCB or three AAA

batteries in a battery pack that is connected to the

+ and – terminals on the PCB.

Press LED ON to turn on the LED in torch mode.

Briefly (less than 1 second) Press FLASH to ob-

serve a higher cell phone camera flash LED cur-

rent.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 902

LOW NOISE HIGH CURRENT LED CHARGE PUMP

Figure1. Proper Measurement Equipment Setup

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 902

LOW NOISE HIGH CURRENT LED CHARGE PUMP

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