DC843A datasheet, PDF - EEWORLD Datasheet

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DC843A: Descriptionboard eval for lt3479ede; CategoryDevelopment board/suite/development tools; File Size929KB，3 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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board eval for lt3479ede

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 843

HIGH CURRENT BOOST LED DRIVER

LT3479

DESCRIPTION

Demonstration circuit 843 is a high current boost

LED driver featuring the LT®3479 and the AOT 3218

Flash LED. The board is optimized for 700mA 300ms

LED flash current or 150mA constant LED torch cur-

rent with a single lithium ion battery input voltage

range of 2.7V to 4.5V. The lithium ion battery input

voltage range, high LED flash current and separate

torch mode current setting, internal npn power

switch, small inductor solution, minimal external

components, and simple design makes the LT3479 an

excellent solution for space-constrained camera flash

solutions with high battery capability.

Demonstration circuit 843 is turned on and off by

pressing the ON/OFF button. A TORCH button turns

the LED on at 150mA for cellular telephone or other

video recording. The FLASH button flashes the LED at

700mA for 300ms for camera flash operation. The

buttons control the state of the PIC microcontroller IC

that is programmed with DC843A software. The PIC

keeps the LED from being constantly in flash mode,

preventing overheating and failure of the LED. 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 LT3479 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 843. In addition,

Advanced Optoelectronic Technology’s datasheet fea-

turing AOT 3218 (http://www.aot.com.tw) must be

read to understand thermal and LED current con-

straints for varying flash current pulse-widths and

intensity. The LT3479 is assembled in a small low

profile DFN package. Proper board layout is essential

for maximum thermal performance. See the data-

sheet 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 843 is easy to set up to evalu-

ate the performance of the LT3479. Follow the proce-

dure below:

Connect 2.7-4.5V input voltage as shown in Figure

Press ‘TORCH’ to observe constant 150mA LED

light for recording video.

Press ‘TORCH’ to turn off the 150mA video mode.

Press ‘ON/OFF’ to turn off the circuit or let the cir-

1 to VIN and GND terminals.

If the state-indicator LED is not blipping green,

cuit turn off by not pressing any buttons for ap-

proximately 10 seconds.

press the ON/OFF button to turn on the circuit.

Press ‘FLASH’ to observe a 300ms, 700mA camera

flash on the AOT 3218 LED.

DC843A Related Products

	DC843A	LT3479EDE#PBF	LT3479EDE#TRPBF	LT3479EFE#TRPBF	LT3479EFE#PBF
Description	board eval for lt3479ede	IC reg boost inv adj 3A 14dfn	IC REG BOOST INV ADJ 3A 14DFN	IC REG BOOST INV ADJ 3A 16TSSOP	Output current: 3A (Switch) Switch operating frequency: 200kHz ~ 3.5MHz Output type: Adjustable Number of output voltage channels: 1 Function type: Step-Up Output configuration: Positive or Negative 3A with soft start and inrush current protection functions , full-featured DC/DC converter
Brand Name	-	Linear Technology	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	-	conform to	conform to	conform to	conform to
Maker	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	-	DFN	DFN	TSSOP	TSSOP
package instruction	-	HVSON, SOLCC14,.12,20	HVSON, SOLCC14,.12,20	HTSSOP, TSSOP16,.25	HTSSOP, TSSOP16,.25
Contacts	-	14	14	16	16
Manufacturer packaging code	-	DE	DE	FE	FE
Reach Compliance Code	-	compliant	compliant	compliant	compliant
ECCN code	-	EAR99	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	-	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR	SWITCHING REGULATOR
control mode	-	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	-	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
Maximum input voltage	-	24 V	24 V	24 V	24 V
Minimum input voltage	-	2.5 V	2.5 V	2.5 V	2.5 V
Nominal input voltage	-	2.5 V	2.5 V	2.5 V	2.5 V
JESD-30 code	-	R-PDSO-N14	R-PDSO-N14	R-PDSO-G16	R-PDSO-G16
JESD-609 code	-	e3	e3	e3	e3
length	-	4 mm	4 mm	5 mm	5 mm
Humidity sensitivity level	-	1	1	1	1
Number of functions	-	1	1	1	1
Number of terminals	-	14	14	16	16
Maximum operating temperature	-	70 °C	70 °C	70 °C	70 °C
Maximum output current	-	6 A	6 A	6 A	6 A
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	HVSON	HVSON	HTSSOP	HTSSOP
Encapsulate equivalent code	-	SOLCC14,.12,20	SOLCC14,.12,20	TSSOP16,.25	TSSOP16,.25
Package shape	-	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	-	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	-	260	250	250	260
Certification status	-	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	-	0.8 mm	0.8 mm	1.1 mm	1.1 mm
surface mount	-	YES	YES	YES	YES
Switch configuration	-	BOOST	BOOST	BOOST	BOOST
Maximum switching frequency	-	4100 kHz	4100 kHz	4100 kHz	4100 kHz
Temperature level	-	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal surface	-	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	-	NO LEAD	NO LEAD	GULL WING	GULL WING
Terminal pitch	-	0.5 mm	0.5 mm	0.65 mm	0.65 mm
Terminal location	-	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	-	30	NOT SPECIFIED	NOT SPECIFIED	30
width	-	3 mm	3 mm	4.4 mm	4.4 mm
Base Number Matches	-	1	1	1	1

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