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SP6685ER Datasheet(PDF) 10 Page - Sipex Corporation

Part # SP6685ER
Description  700mA Buck/Boost Charge Pump LED Driver
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6685ER Datasheet(HTML) 10 Page - Sipex Corporation

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Date: 7/6/06 Rev B
SP6685, 700mA Buck/BoostCharge Pump LED Driver
© 2006 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
The SP6685 can be used with multiple LEDs in parallel as shown in figure 31. For best
performance, the LEDs should be in a single package, preferably from a single die to have
better matching for forward voltage Vf for a given forward current If. In practice, if the Vf of one
LED is higher than the others, it will consume a larger If, which will raise its temperature which
will then cause its Vf to reduce, correcting the imbalance. The overall current will be the sum
of the individual currents, for example Itotal = 4*ILED.
GM5BW05340AC
J2
1
2
3
D1
Sharp LED
Cout
4.7 uF
CF
1uF
Vin: 3.0-4.2V
SP6685
Vin
1
C1
2
IFB
7
ISET
6
EN
5
FLASH
4
C2
3
SGND
8
PGND
9
VOUT
10
R SET
139K
R EN
10K
Cin
10uF
R FB
0.33 Ohm
SW2
Push ON
VFB = 50mV Torch150mA
100mV Flash 300mA
Jumper
Efficiency
40
50
60
70
80
90
100
3.0
3.2
3.4
3.6
3.8
4.0
4.2
Vin (V)
Flash 600mA
Flash 300mA
Torch 150mA
Flash 400mA
Flash 500mA
Output Current
0
100
200
300
400
500
600
700
800
900
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
Vin (V)
Flash 600mA Vf=4.34V
Flash 500mA Vf=4.13V
Flash 400mA Vf=3.93V
Flash 300mA Vf=3.72V
Torch 150mA Vf=3.33V
Figure 29. Efficiency vs. VIN.
Figure 30. Output Current vs. VIN.
Figure 31. MULTIPLE LED FLASH CIRCUIT.
APPLICATION INFORMATION
Application Circuit = Figure 31, TA = 25°C.


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