DC805A - Demo Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 805
LOW NOISE HIGH CURRENT LED CHARGE PUMP
LTC3216
DESCRIPTION
Demonstration circuit 805 is a low noise high current
LED charge pump featuring the LTC®3216 and the
LXCL-PWF1 Lumileds Luxeon Flash. The board is optimized for 800mA 300ms LED flash current or
200mA constant LED torch current 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 LTC3216
is the top solution for space-constrained cellular telephone camera flash solutions.
DC805 comes with three AAA batteries in series to
simulate the capabilities of a typical lithium ion cellular telephone battery. This portable board is turned on
and off by pressing the ON/OFF button. A TORCH button turns the LED on at 200mA for cellular telephone
video recording. The FLASH button flashes the LED at
800mA for 300ms for cellular telephone camera flash
operation. The buttons control the state of the PIC
microcontroller IC that is programmed with DC805
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 preservation.
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 occurred, 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 LTC3216 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 805. 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
LTC3216 is assembled in a small low profile DFN
package. Proper board layout is essential for maximum thermal performance. See the datasheet section
‘Layout Considerations’.
Design files for this circuit board are available. Call
the LTC factory.
LTC is a trademark of Linear Technology Corporation
QUICK START PROCEDURE
Demonstration circuit 805 is easy to set up to evaluate the performance of the LTC3216. Follow the procedure below:
NOTE: Make
sure that the input voltage does not exceed 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 absolute maximum voltage on VIN is 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.
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 805
LOW NOISE HIGH CURRENT LED CHARGE PUMP
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, 800mA camera
flash on the LXCL-PWF2 LED.
4.
Press ‘TORCH’ to observe constant 200mA LED
light for recording video.
5.
Press ‘TORCH’ to turn off the 200mA video mode.
6.
Press ‘ON/OFF’ to turn off the circuit or let the circuit turn off by not pressing any buttons for approximately 10 seconds.
2
0603
C2+ 1
C2- 10
C1+ 2
C1- 12
EN2
8
CPO 3
VIN
EN1
EN2
2
B
2
3
3
4
5
6
7
4
RA5
VSS 14
RA0 13
RA4
RA1
MCLR#
RA2
RC5
RC0
RC4
RC1
RC3
RC2
VDD
12
LED1
LXCL-PWF1
200mA/800mA
LUMILEDS
C2
4.7uF,6.3V
0603
11
10
13
11
9
8
R6
10k
PIC16F630I/ST
R7
10k
B
CONTRACT NO.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
R4
6.34k
1%
SW3
BOURNS-7914J
1
2
ON/OFF
CUSTOMER NOTICE
1. ALL RESISTORS ARE IN OHMS, 0402.
+
1
1
R2
1K
NOTES: UNLESS OTHERWISE SPECIFIED
6
4
R3
19.1k
1%
U2
LED2
LTST-C155KGJRKT
1
ILED 5
C
SW2
BOURNS-7914J
1
2
Torch
R1
1K
U1
LTC3216EDE
GND
7
GND
EN1
ISET2
C6
2.2uF,6.3V
0603
D
2
1
1
9
R5
10k
SW1
BOURNS-7914J
1
2
Flash
5
0603
ISET1
BT1
2479
PC MOUNT
KEYSTONE
C
A
C3
2.2uF,6.3V
2
VIN
C4
0.1uF,6.3V
1
C1
2.2uF,6.3V
2
3
4
5
2
C5
0.1uF,6.3V
PLASTIC BATTERY HOLDER
HOLDS 3 AAA CELLS IN SERIES
+
4
6
6
JP1
HD2X3-079
OPT
D
3
3
4
5
5
3
APPROVALS
DRAWN:
CHECKED:
APPROVED:
ENGINEER: KEITH S.
DESIGNER:
TECHNOLOGY
KIM T.
TITLE:
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
SCHEMATIC
A
LOW NOISE HIGH CURRENT LED CHARGE PUMP
SIZE
DWG NO.
A
DATE:
DC805A-1* LTC3216EDE
Thursday, September 09, 2004
2
SHEET 1
1
REV
A
OF 1
BILL OF MATERIALS
DC805A-1
Linear Technology Corporation
LTC3216EDE
6/20/2005
10:47 AM
LOW NOISE HIGH CURRENT LED CHARGE PUMP
ENG: KEITH SZOLUSHA (23-30)
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Qty Reference
1
2
2
4
3
1
2
0
1
1
2
1
1
3
3
1
1
BT1 (CUSTOMER PROVIDE)
SCREWS (CUSTOMER PROVIDE)
HEX NUT (CUSTOMER PROVIDE)
WASHER (CUSTOMER PROVIDE)
C1,C3,C6
C2
C4,C5
JP1
LED1 (CUSTOMER PROVIDE)
LED2
R1,R2
R3
R4
R5,R6,R7
SW1,SW2,SW3 (CUSTOMER PROVIDE)
U1
U2
Part Description
BATTERY HOLDER, 3AAA
M2 X 0.4 SCREW
M2 X 0.4 HEX NUT
3MM METRIC WASHER
CAP., X5R, 2.2uF 6.3V, 10%,0603
CAP., X5R, 4.7uF 6.3V, 10%,0603
CAP., X5R, 0.1uF 6.3V, 20%,0402
JMP, 2X3PIN, 0.079CC
LED EMITTER, LXCL-PWF1
LED CHIP, GREEN/RED COLOR ,LED-LTST-C155KGJRKT
RES., CHIP, 1K 1/16W, 5%, 0402
RES., CHIP, 19.1K, 1%, 0402
RES., CHIP, 6.34K, 1%, 0402
RES., CHIP, 10K 1/16W, 5%, 0402
SWITCH, PUSH BUTTON,SW-7914J
IC, LTC3216EDE,DFN12DE
IC, PIC16F630I/ST, TSSOP14
Page 1 - of - 1
Manufacture / Part #
KEYSTONE, 2479
M2 X 0.4 SCREW
M2 X 0.4 HEX NUT
H275125019
AVX, 06036D225KAT1A
AVX, 06036D475KAT1A
AVX, 04026D104MAT1A
COMM CON, 2202S-06G2
LUMILEDS, LXCL-PWF1
LITE-ON, LTST-C155KGJRKT
AAC., CR05-102JM
AAC., CR05-1912FM
VISHAY, CRCW0402 6.34K 1%
AAC., CR05-103JM
BOURNS, 7914J-1-000-E
LINEAR TECH., LTC3216EDE
MICROCHIP, PIC16F630I/ST
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