Jun13-07

SP7686A Evaluation Board Manual

© 2007 Sipex Corporation

Page 2 of 5

TO GET STARTED:

1. Connect VIN from VIN to GND (VIN range 2.7V to 4.2V).

2. Select mode between TORCH and FLASH by putting jumper into J1 corresponding position.

3. Apply High to ON terminal (SW1) or EN Pin (J2) to turn the LED on.

POWER SUPPLY DATA

Flash Mode Output Current

0

100

200

300

400

500

2.7

3.0

3.3

3.6

3.9

4.2

Vin (V)

Ci=4.7uF,CF=0.22uF,Co=1uF

Ci=4.7,CF=1uF,Co=1uF

Ci=10uF,CF=0.22uF,Co=2.2u

Flash Mode Output Current

200

250

300

350

400

450

500

2.7

3.0

3.3

3.6

3.9

4.2

Vin (V)

PWF1 Vf=3.08V

AOT Vf=3.43V

Figure 2. Flash Mode Output Current

Torch Mode Output Current

0

50

100

150

200

250

300

2.70

3.00

3.30

3.60

3.90

4.20

Vin (V)

Ci=4.7uF,CF=0.22uF,Co=1uF

Ci=4.7,CF=1uF,Co=1uF

Ci=10uF,CF=0.22uF,Co=2.2uF

Efficiency

30

40

50

60

70

80

90

100

2.7

3.0

3.3

3.6

3.9

4.2

Vin (V)

Flash 450mA

Torch 150mA

Figure 4. Output Efficiency with PWF1

Figure 5. Startup 150mA Torch,Vin=4.2V.

Figure 6. Startup 450mA Flash, Vin=3.4V

EN

Vout

VFB

Iin:

0.5A/div

EN

Vout

VFB

Iin:

1A/div