Jun20-07

SP7680 Evaluation Board Manual

© 2007 Sipex Corporation

Page 2 of 6

TO GET STARTED:

1. Connect VIN from VIN to GND (VIN range 2.7V to 5.5V).

2. Apply I

3. Connect LED Displays with cathodes to T1 to T7 for LED1 to LED7. Or, connect surface

mount LEDs with solder to the board at D1 to D7.

4. Use I

5. To measure current through LED1 to LED7 remove zero ohm resistor at RS1 to RS7 and add

SM 0603 1 ohm resistors to RS1 to RS7. Then measure current with DVM across RS1 to RS7

with test points at J1 to J7. Note: 1mV across J1 to J7 equals 1mA of current through LED1 to

LED7.

___________________________________________________________ POWER SUPPLY DATA

SP7680 Efficiency Vs Vin, 6 WLEDs

50

60

70

80

90

100

3.0

3.3

3.6

3.9

4.2

4.5

Vin (V)

ILED=15mA

ILED=20mA

ILED=25mA

SP7680 Efficiency Vs Vin, 7 WLEDs

50

60

70

80

90

100

3.0

3.3

3.6

3.9

4.2

4.5

Vin (V)

ILED=15mA

ILED=20mA

ILED=25mA

Output Current Vs Vin, 6 WLEDs

50

100

150

200

3.0

3.3

3.6

3.9

4.2

Vin (V)

ILED=25mA

ILED=20mA

ILED=15mA

Output Current Vs Vin, 7 WLEDs

50

100

150

200

3.0

3.3

3.6

3.9

4.2

Vin (V)

ILED=15mA

ILED=20mA

ILED=25mA

Figure 3.Output Current 6 LEDs

Figure 4. Output Current 7 LEDs