DC810A Quick Start Guide Datasheet by Analog Devices Inc.

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 810
HIGH EFFICIENCY BUCK-BOOST FLASH LED DRIVER
1
LTC3453
DESCRIPTION
Demonstration circuit 810 is a high efficiency buck-
boost flash LED driver featuring the LTC®3453 and
the LXCL-PWF1 Lumileds Luxeon Flash. The board is
optimized for 500mA 300ms LED flash current or
150mA constant LED torch current with a single Lith-
ium-Ion battery input voltage range of 2.7V to 4.2V or
three AAA batteries in series. The Lithium-Ion battery
input voltage range, high LED flash current and sepa-
rate torch mode current setting, internal synchronous
power switches, minimal and low-profile external
components, and simple design makes the LTC3453
the top solution for highly efficient, space-constrained
cellular telephone camera flash solutions.
DC810 comes with three AAA batteries in series to
simulate the capabilities of a typical Lithium-Ion cellu-
lar telephone battery. This portable board is turned on
and off by pressing the ON/OFF button. A TORCH but-
ton turns the LED on at 150mA for cellular telephone
video recording. The FLASH button flashes the LED at
500mA for 300ms for cellular telephone camera flash
operation. The buttons control the state of the PIC
microcontroller IC that is programmed with DC810
software. The PIC keeps the LED from being flashed
constantly, preventing overheating and burnout. The
PIC also controls the flash time. When no buttons are
pressed for a short time, the PIC turns off and the
circuit enters low-power mode for battery-life preser-
vation.
A red/green LED indicates the state of the PIC. The
LED is ready to flash or torch if the state indicator is
blipping green. If the indicator is not on, the PIC is
turned off. For a brief time after the flash has oc-
curred, the state-indicator LED is red, indicating that
another flash cannot happen, even if the button is
pressed, until the red LED is off and the green LED is
blipping again.
The LTC3453 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 810. In
addition, Lumileds Luxeon Flash datasheet featuring
LXCL-PWF1 (www.lumileds.com) must be read to
understand thermal and LED current constraints for
varying flash current pulse-widths and intensity. The
LTC3453 is assembled in a small low profile QFN
package. Proper board layout is essential for maxi-
mum thermal performance. See the datasheet section
‘Layout Considerations’.
Design files for this circuit board are available. Call
the LTC factory.
LT is a trademark of Linear Technology Corporation
QUICK START PROCEDURE
Demonstration circuit 810 is easy to set up to evalu-
ate the performance of the LTC3453. Follow the pro-
cedure below:
NOTE:
Make sure that the input voltage does not ex-
ceed 5V if a source other than the three AAA batteries
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.
NOTE:
Connect the three AAA batteries as indicated in
the battery pack with the polarity indicated on the
back of the PCB.
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 810
HIGH EFFICIENCY BUCK-BOOST FLASH LED DRIVER
2
1.
Insert three AAA batteries in the battery pack on
the back of the PCB.
2.
If the state-indicator LED is not blipping green,
press the ON/OFF button to turn on the circuit.
3.
Press ‘FLASH’ to observe a 300ms, 500mA camera
flash on the LXCL-PWF1 LED.
4.
Press ‘TORCH’ to observe constant 150mA LED
light for recording video.
5.
Press ‘TORCH’ to turn off the 150mA video mode.
6.
Press ‘ON/OFF’ to turn off the circuit or let the cir-
cuit turn off by not pressing any buttons for ap-
proximately 10 seconds.
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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 810
HIGH EFFICIENCY BUCK-BOOST FLASH LED DRIVER
3

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