APW7071(2008) Просмотр технического описания (PDF) - Anpec Electronics

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APW7071
(Rev.:2008)

Step-Up Converter for 4 Series White LEDs Driver

Anpec Electronics 

APW7071

Operating Waveforms

(Circuit

of

Figure

1,

V

IN

=

3.3V,

I

LED

=

20mA,

L1

=

4.7µH,

C

IN

=

4.7µF,

C

OUT

=

0.1µF,4

LEDs,

T

A

=

+25°C,

unless

otherwise

noted.)

Start-up Waveform

OVP Waveform

VSHDN

1

VOUT

VOUT

1

2

IIN

3

CH1: VSHDN, 2V/Div, DC

CH2: VOUT, 5V/Div, DC

CH3: IIN, 100mA/Div, DC

Time: 1ms/Div

CH1: VOUT, 5V/Div, DC

Time: 20ms/Div

PFM Operation

1

Pulse Burst Operation

1

2

2

3

CH1: VOUT, 200mV/Div, AC

CH2: VSW, 10V/Div, DC

CH3: VFB, 100mA/Div, DC

Time: 1µs/Div

3

CH1: VOUT, 200mV/Div, AC

CH2: VSW, 10V/Div, DC

CH3: VFB, 100mA/Div, DC

Time: 2µs/Div

Copyright © ANPEC Electronics Corp.

5

Rev. A.3 - Jul., 2008

www.anpec.com.tw

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