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SP6682ER Datasheet(PDF) 9 Page - Sipex Corporation

Part # SP6682ER
Description  High Efficiency Charge Pump Regulator for White LEDs
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6682ER Datasheet(HTML) 9 Page - Sipex Corporation

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9
Date: 7/1
9/06 Rev D
SP6682 High Efficiency Charge Pump Regulator for White LEDs
© 2006 Sipex Corporation
70
75
80
85
90
95
100
2.7
3.0
3.3
3.6
3.9
4.2
VIN (V)
D11
X5R Ceramic
D3
SOT23
R2
15
25V
L1 LQH32CN4R7M11
4.7uH
D12
D8
DS SCHOTTKY MBR0530
D4
Q1
Ceramic
EN/PWM
R1
15
D6
C1
10uF
D9
D7
C3 X5R
2.2uF 25V
D10
D2
R3
1M
ILED = VFB/R1 = 20mA
SP6682
1
2
7
6
5
4
3
8
9
10
VOUT
C1P
C2N
EN/PWM
FB
VMODE
VIN
GND
C1N
C2P
D1
SI1304
D5
Vin: 2.7-4.2V
Figure 16. Using SP6682 as a High Voltage White LED Driver
PINOUTS
SP6682
10 Pin DFN
10
9
8
7
6
1
2
3
4
5
C2P
C1N
GND
C2N
EN/PWM
VOUT
C1P
VIN
VMODE
FB
VOUT
C1P
VIN
VMODE
FB
SP6682
10 Pin MSOP
1
2
3
4
5
10
9
8
7
6
C2P
C1N
GND
C2N
EN
POWER EFFICIENCY
The efficiency of driving the white LEDs can
be calculated by:
= VF • IF =
VF • IF � VF
Vi •Ii
Vi • (n • IF + IQ) Vi • n
WhereVi,IiareinputvoltageandcurrentVF,
IF are the forward voltage and operating
current of White LEDs; IQ is quiescent cur-
APPLICATION INFORMATION: Continued
rent, which is considered small compared
with IF; n is the boost ratio (X1.5 or X2).
SP6682 HIGH VOLTAGE
WHITE LED DRIVER
The SP6682 can also be configured as a
high voltage boost converter to drive more
than 10 white LEDs. Figure 16 shows the
schematic of this application as well as
actual data showing efficiency of > 85%. By
using an external inductor, MOSFET and
diode, high output voltages can be
generated to drive 12 white LEDs (2
branches -- each branch has 6 white LEDs
in series). The current through the white
LEDs is determined by:
ILED = VFB
R1


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