SC4541 datasheet(7/19 Pages) SEMTECH

7 / 19 page

SC4541

Typical Characteristics (continued)

300Hz PWM Dimming, 0.1% Duty Cycle

Start-up — by V

Time (2mS/div)

Start up By Vin

Test condition: 5Vin, LEDs=6S1P, R1=10Ω

ΩΩ

, SC4541(1120)

VOUT

VIN

(0.2A/div)

VSW

(10V/div)

VOUT

(5V/div)

VIN

(2.5V/div)

Shut Down

Time (5mS/div)

(0.2A/div)

VSW

(10V/div)

VOUT

(5V/div)

VIN

(2.5V/div)

Start-up — by PWM

Time (0.1S/div)

PWM

(3V/div)

(0.3A/div)

VSW

(10V/div)

VOUT

(5V/div)

Main Power Switching

Time (0.5μS/div)

(0.2A/div)

VSW

(5V/div)

VOUT

(50mV/div)

VIN

(1V/div)

5VIN to 12VIN

VIN Fluctuation — Rising

Time (2μS/div)

VSW

(10V/div)

VOUT

(1V/div)

VIN

(5V/div)

12VIN to 5VIN

VIN Fluctuation — Falling

Time (20μS/div)

VSW

(10V/div)

VOUT

(1V/div)

VIN

(5V/div)

Conditions: 5V

IN, 20mA ,6 LEDs in series, CIN/COUT=1µF, L=10µH

Shutdown By Vin

Test condition: 5Vin, LEDs=6S1P, R1=10Ω

ΩΩ

, SC4541(1120)

VOUT

VIN

Start up By PWM

Test condition: 5Vin, LEDs=6S1P, R1=10Ω

ΩΩ

SC4541(1120), PWM Dimming 300Hz, 0.1% duty.

VOUT

VIN Fluctuation - Rising

VOUT

VIN

Test condition: 5Vin to 12Vin, LEDs=6S1P,

R1=10Ω

ΩΩ

, SC4541(1120)

Mail Power Switching

Test condition: 5Vin, LEDs=6S1P, R1=10Ω, SC4541(1120)

VOUT

VIN

VIN Fluctuation - Falling

Test condition: 5Vin to 12Vin, LEDs=6S1P,

R1=10Ω

ΩΩ

, SC4541(1120)

VOUT

VIN

•

It’s fine under 25°°°°C ambient temperature.

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