LP3322 datasheet(7/8 Pages) POWER

部件名	LP3322

功能描述	1.1MHzFixed-Frequency PWM Operation

PDF	8 Pages

Scroll/Zoom	100%

制造商	POWER [Lowpower Semiconductor inc]

网页	http://www.lowpowersemi.com

标志

7 / 8 page

Preliminary Datasheet

LP3322

LP3322 – 00 Vesion 1.0 Datasheet

Feb.-2013

www.lowpowersemi.com

Page 7 of 8

c. Using a Filtered PWM signal

Another common application is using a filtered

PWM signal as an adjustable DC voltage for LED

dimming control. A filtered PWM signal acts as the

DC voltage to regulate the output current. The

recommended application circuit is shown in the

Figure 6. In this circuit, the output ripple depends

on the frequency of PWM signal. For smaller output

voltage

ripple

(<100mV),

the

recommended

frequency of 2.8V PWM signal should be above

2kHz. To fix the frequency of PWM signal and

change the duty cycle of PWM signal can get

different

output

current.

According

the

application circuit of Figure 5, output current is

from 20.5mA to 5.5mA by adjusting the PWM duty

cycle from 10% to 90%.

Vin

OUT

LP3322

PWM

Vin

Cout

1uF

Cin

10uF

10uH

90k

100K

(0-100KHz)

0.1uF

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