6

Date: 03/10/06

SP6686 400mA, Buck/Boost Charge Pump LED Driver

© Copyright 2006 Sipex Corporation

TYPICAL PERFORMANCE CHARACTERISTICS

Output Current Vs Supply Voltage

0

100

200

300

400

500

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V)

Flash 400mA Vf =

3.5V

Torch 150mA Vf =

3.1V

D1 = AOT 3228HPW0303B LED, Rsense =

0.33Ω,

Rset = 140KΩ, Cin = 2.2µF, Cfc =

0.47µF, Cout = 1µF.

Efficiency Vs Supply Voltage

40

50

60

70

80

90

100

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V)

Flash 400mA

Vf = 3.5V

Torch 150mA

Vf = 3.1V

Battery Current Vs Supply Voltage

0

200

400

600

800

1000

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V)

Flash 400mA Vf =

3.5V

Torch 150mA Vf =

3.1V

D1 = AOT2015HPW-1915B LED, Rsense =

0.33Ω, Rset = 106KΩ, Cin = 2.2µF, Cfc =

0.47µF, Cout = 1µF.

Figure 9

Figure 12

Efficiency Vs Supply Voltage

40

50

60

70

80

90

100

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V)

Flash 300mA

Vf = 3.85V

Torch 150mA

Vf = 3.45V

Figure 10

Figure 13

Figure 11

Figure 14

Output Current Vs Supply Voltage

0

50

100

150

200

250

300

350

400

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V)

Flash 300mA Vf = 3.85V

Torch 150mA Vf = 3.45V

Battery Current Vs Supply Voltage

0

100

200

300

400

500

600

700

800

3.0

3.2

3.4

3.6

3.8

4.0

4.2

Vin (V)

Flash 300mA Vf = 3.85V

Torch 150mA Vf = 3.45V

Note: Diode, resistor and capacitor settings apply to figures 9, 10 & 11.

Note: Diode, resistor and capacitor settings apply to figures 12, 13 & 14.