AL8808WT-7 Diodes Inc., AL8808WT-7 Datasheet - Page 11
![no-image](/images/no-image-200.jpg)
AL8808WT-7
Manufacturer Part Number
AL8808WT-7
Description
LED Lighting Drivers LED MV Int Switch TS Switch TSOT25 T&R 3K
Manufacturer
Diodes Inc.
Datasheet
1.AL8808WT-7.pdf
(20 pages)
Specifications of AL8808WT-7
Rohs
yes
Input Voltage
6 V to 30 V
Operating Frequency
1 MHz
Maximum Supply Current
450 uA
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
TSOT-25
Minimum Operating Temperature
- 40 C
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AL8808WT-7
Manufacturer:
DIODES/美台
Quantity:
20 000
Applicatio
PWM Dimmin
The CTRL pin is
output stage.
The ultimate PW
lower switching
the accuracy/line
At the start of e
threshold isn’t re
Greater PWM d
frequency.
The three figure
from a 12V rail a
As can be obse
value.
AL8808
Document number
Figure 36. 0
Figure 38. 0
on Informat
ng
WM dimming reso
dimming dynami
eached then the
at +25°C for a no
s designed to be
r: DS35648 Rev. 2
earity of the PWM
each PWM cycle
frequencies and
s below show 0.
.2% PWM Duty
.2% PWM Duty
rved from Figure
(cont.)
68µH
22µH
e driven by both
ominal LED curre
e 37 greater dim
tion
olution is determ
M dimming.
H Inductance
H Inductance
e the LED curre
/or higher PWM
accuracy will be
c ranges can be
2% duty cycle P
Cycle at 100Hz
Cycle at 500Hz
- 2
(cont.)
mming accuracy c
PWM pulse resol
ent of 670mA
ent needs to res
e achieved by r
3.3V and 5V log
ined by the num
frequencies the
greatly affected.
PWM Frequenc
PWM Frequenc
.
gic levels directly
cy and
cy and
start from zero u
.
reducing the PW
can be achieved
w
www.diodes.co
ution with differe
ber of full LED s
number of full sw
11 of 20
Fig
WM dimming fre
ent PWM frequen
gure 37. 0.2% P
d by reducing bo
y from a logic ou
switching cycles t
witching cycles t
up to the upper
m
r threshold level
ncies and differe
that can be achie
that can be achie
tput with either a
quency and/or i
th the PWM dim
WM Duty Cycle
22µH Indu
mming frequency
e at 100Hz PWM
uctance
an open drain ou
eved is reduced
eved during the
nt inductor value
ncreasing the A
(nominally 120
AL8808 switching
es driving 2 LEDs
utput or push pu
PWM on-time. A
mV/R
thereby reducing
© Diodes Incorporate
Frequency and
and the inducto
AL8808
January 201
SET
). If this
At
or
d
ed
g
s
g
s
ll
3