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AL9910 データシート(PDF) 10 Page - Diodes Incorporated

部品番号 AL9910
部品情報  UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER
PDF  16 Pages
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メーカー  DIODES [Diodes Incorporated]
ホームページ  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AL9910 データシート(HTML) 10 Page - Diodes Incorporated

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AL9910/AL9910A/AL9910-5
UNIVERSAL HIGH VOLTAGE HIGH BRIGHTNESS LED DRIVER
AL9910/AL9910A/AL9910-5
Document number: DS35103 Rev. 7 - 2
10 of 16
www.diodes.com
February 2012
© Diodes Incorporated
Applications Information (cont.)
AC/DC Off-Line LED Driver
The AL9910 is a cost-effective off-line buck LED driver-controller specifically designed for driving LED strings. It is suitable for
being used with either rectified AC line or any DC voltage between 15-500V. See figure 3 for typical circuit.
Fig. 3 Typical Application Circuit (without PFC)
Buck Design Equations:
=
D
IN
LEDs
V
V
osc
ON
f
D
t
=
≥
L
LED
ON
LEDs
IN
I
3
.
0
t
)
V
V
(
×
×
−
=
SENSE
R
))
3
.
0
I
(
5
.
0
(
I
25
.
0
LED
LED
×
×
+
where ILED x 0.3 = IRIPPLE
Design Example
For an AC line voltage of 120V the nominal rectified input voltage VIN = 120V*1.41 = 169V. From this and the LED chain
voltage the duty cycle can be determined:
D = VLEDs /VIN = 30/169 = 0.177
From the switching frequency, for example fOSC = 50kHz, the required on-time of the external MOSFET can be calculated:
tON = D/fOSC = 3.5 µs
The value of the inductor for an LED current of 350mA is determined as follows:
L = (VIN - VLEDs) * tON /(0.3 * ILED) = 4.6mH
R
SENSE
AL9910/A
GATE
CS
LD
PWM_D
GND
R
OSC
V
DD
V
IN
LED +
LED -
V
AC IN
Q1
L1
D1
C1
R
OSC
C2
C3
BR1
R
SENSE
AL9910/A
GATE
CS
LD
PWM_D
GND
R
OSC
V
DD
V
IN
LED +
LED -
V
AC IN
Q1
L1
D1
C1
R
OSC
C2
C3
BR1



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