AIC1647 Ver la hoja de datos (PDF) - Analog Intergrations

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AIC1647

White LED Step-Up Converter in SOT23

Analog Intergrations 

AIC1647

TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

VSHDN, 2V/div

VOUT, 2V/div

IINDUCTOR, 100mA/div

VIN=3.6V; 3 LEDs; L1=10µF; COUT=0.22µF; ILED=20mA

Fig. 14 Start-Up from Shutdown

VOUT, 100mV/div

IINDUCTOR, 100mA/div

VSW, 10V/div

VIN=3.6V; 3 LEDs; L1=10µF; COUT=0.22µF; ILED=10mA

Fig. 16 Operation Wave Form

25

20

15

VIN=4.2V

10 VIN=3.6V

VIN=3.3V

5 VIN=2.5V

4 LEDs

0

-80 -60 -40 -20 0 20 40 60 80 100

Temperature (°C)

Fig. 18 LED Current vs. Temperature

VSHDN, 2V/div

IINDUCTOR, 100mA/div

VOUT, 20V/div

VIN=3.6V; 6 LEDs; L1=10µF; COUT=0.22µF; ILED=10mA

Fig. 15 Start-Up from Shutdown

11.0

10.5

10.0

9.5

9.0

3 LEDs

8.5

ILED=20mA

8.0

7.5

6 Samples' Temperature Data

7.0

-40 -20 0

20 40 60 80 100

Temperature (°C)

Fig. 17 Output voltage vs. temperature

6

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