AIC1648 datasheet(5/10 Pages) AIC

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AIC1648

TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

LED Current (mA)

Fig. 8 3 LEDs Efficiency vs. LED Current

3 LEDs, 10µH

L1: 976AS-100M, TOKO

D1: RB521S-30, ROHM

Test circuit refer to Fig.1

VIN=3.6V

VIN=4.2V

VIN=3.0V

LED Current (mA)

Fig. 9

4 LEDs Efficiency vs. LED Current

VIN=3.6V

VIN=4.2V

VIN=3.0V

4 LEDs, 10µH

L1: 976AS-100M, TOKO

D1: RB521S-30, ROHM

Test circuit refer to Fig.1

LED Current (mA)

Fig. 10 5 LEDs Efficiency vs. LED Current

VIN=3.6V

VIN=4.2V

VIN=3.0V

5 LEDs, 10µH

L1: 976AS-100M, TOKO

D1: RB521S-30, ROHM

Test circuit refer to Fig.1

LED Current (mA)

Fig. 11 3 LEDs Efficiency vs. LED Current

VIN=3.6V

VIN=4.2V

VIN=3.0V

3 LEDs, 6.8µH

L1: 976AS-6R8M, TOKO

D1: RB521S-30, ROHM

Test circuit refer to Fig.1

Fig. 12 Start-Up from Shutdown

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

VSHDN, 2V/div

IINDUCTOR, 100mA/div

VOUT, 2V/div

Fig. 13

Operation Wave Form

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

VOUT, 100mV/div

IINDUCTOR, 100mA/div

VSW, 10V/div

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