Datasheet

Board Layout

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Figure 5. TX Jumper Settings

SDA / SCL - These connections allow the user to externally control the I

C lines. For independent control

of the I

C lines, do not connect the VIO jumper to either the 3.3V or the VIN pin.

VOUT / VLED - These provide access to the regulated output of the driver and the output of the LED

current source. The user can measure VOUT with reference to GND, VLED with reference to GND and

current source headroom directly between VOUT and VLED.

2.2 Setup

The input voltage range for the flash driver is 2.7 volts to 5.5 volts. The on-board LEDs or an LED module

should be connected for proper operation.

2.3 Operation

For proper operation of the LM3565, the jumpers should be properly configured. The recommended

setting, using shorting blocks.

VIO to VIN

HWEN to VIO

STROBE to PWM0 or external signal

TORCH to PWM1 or external signal

TX to PWM2 or external signal

LEDs (J5) shorted

In this configuration, the device will power up when power is applied.

3 Board Layout

Figure 6, Figure 7, Figure 8, Figure 9, Figure 10 and Figure 11 show the board layout for the

LM3565EVM. The EVM offers resistors, capacitors and jumpers to Enable the device and to configure it

as desired.

The LM3565 will dissipate power, especially during high current and long duration flash events. Power will

also be dissipated on the flash LEDs. The EVM layout is designed to minimize temperature rise during

operation. It is recommended that in order to prevent overheating, repeated flash events in very short time

intervals is avoided.

LM3565EVM User's Guide SNVU195A–FEBRUARY 2013–Revised MAY 2013

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