SP6683 Datasheet, PDF (7/14 Pages) Sipex Corporation – High Power LED Driver for Parallel Configuration

APPLICATION INFORMATION
Configuring as Cellphone Camera
Configuring as Camera Flash + Torch Driver
Flash Driver
The SP6683 can be configured as a flash/
SP6683 is capable of delivering up to 200mA
current, which is perfect to drive the most
common LEDs in today's market. It is
torch LED driver which in some applications
require constant torch current used for mo-
tion pictures (i.e. movie mode).
designed to work in the cell phone camera
flash which powers up directly from the
Lithium-Ion battery.
C2
1uF
6.3V/0603
1 Vout
C2P 10
2 C1P
C1N ⁹ C3
SP6683
1uF
6.3V/0603
3.0 - 4.2V
Lithium
Ion
Io=Vfb/Rb
C2
1µF
C1
2.2µF
®
1 _VOUT
C2P ¹⁰
2 _{C1P SP6683 C1N} 9
3 _VIN
4 _VMODE
5
FB
GND ⁸
C2N ⁷
6
EN/PWM
R1
1MΩ
C5 ^D1
2.2µF
White
LED
C4
1µF
RB2
R2
RB1
1MΩ
Vin
2.7V~4.2V
C1
2.2uF
6.3V/0603
3 Vin
4 ^Vmode
GND 8
C2N 7
5 _FB EN/PWM 6
EN/PWM
LED1
C4
2.2uF
6.3V/0603
ENABLE
FLASH
Camera Flash/Torch Application
Rb
1.5 ohm
1% / 0603
Camera Flash Application
Configuring as LCD Backlight
The SP6683 is able to efficiently drive up to
eight 20mA white LEDs in parallel and
maintain a constant brightness over a very
wide operating voltage range (2.7V to 5.5V)
400
350
300
250
200
150
100
50
0
3.2
Flash Mode
Torch Mode
Torch Mode: Vf=3.2V , Enable = High, FLASH = Low.
Flash Mode: Vf=3.3V, Enable = High, FLASH = High.
3.4
3.6
3.8
4.0
4.2
Vin (V)
Figure 13. I_OUT vs. V_IN
Programming X1 or X1.5 Operating Mode
®
C2
1µF
1 _{VOUT SP6683}
2
C1P
C2P ¹⁰
C1N ⁹
2.7 -
4.2V
Lithium
-Ion
3
V_IN
4
C1
V_MODE
5
FB
1µF
8
GND
7
C2N
6
EN/PWM
LCD Backlight Application
C5
For simplest application circuitry, SP6683's
mode can be fixed by connecting V_MODE to V_IN
1µF
for X1 mode or connecting V_MODE to GND for
X1.5 mode. The SP6683 can automatically
C4
change from X1 mode to X1.5 to maximize
White ^{efficiency. To use this feature, divider resistors}
1µF
LED ^{should be chosen according to the specific ap-}
plication, as shown below.
R6 ₂₀
20
ENABLE
V_IN
3
R1
4
R2
C2
V_IN
SP6683
V_MODE
GND
8
Programming the Vmode Resistors
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
7
© Copyright 2006 Sipex Corporation