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AL1663 数据表(PDF) 11 Page - Diodes Incorporated

部件名 AL1663
功能描述  SINGLE STAGE DIMMABLE LED CONTROLLER
PDF  15 Pages
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制造商  DIODES [Diodes Incorporated]
网页  http://www.diodes.com
标志 DIODES - Diodes Incorporated

AL1663 数据表(HTML) 11 Page - Diodes Incorporated

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AL1663/AL1663R
Document number: DS38466 Rev. 1 - 2
11 of 15
www.diodes.com
May 2016
© Diodes Incorporated
AL1663/AL1663R
Application Information (Cont.)
Operation Parameters Design
Setting the Current Sense Resistor RCS
The current sense resistance can be calculated as following:
_
2
PS
REF
CS
O MEAN
NV
R
I
Where IO_MEAN is the mean output current; RCS is current sense resister which is shown as Figures 1 and 2;
VREF is internal reference voltage that is equal to 0.3V; NPS is the turns ratio of Flyback transformer (NPS=1 for Buck-boost).
Setting Transformer Selection (T1)
NPS is limited by the electrical stress of the switch MOSFET, can be calculated by below formula.
_(
)
_
_
90%
2
MOS
BR DS
IN MAX
S
PS
O
D F
V
V
V
N
VV
 
Where VMOS_(BR)DS is the breakdown voltage of the switch MOSFET. VIN_MAX is the max rated input voltage. ∆VS is the overshoot voltage
clamped by RCD snobbier during OFF time. VO is the output voltage. VD_F is the forward voltage of secondary diode. NPS is the turns ratio of
Flyback transformer (NPS=1 for Buck-boost);
For boundary conduction mode and constant on time method, the peak current of primary inductance can be calculated as below.
_
_
0
_
2
2
sin( )
sin( )
2
sin( )
O MEAN
P
IN
RMS
PS
IN
RMS
PS
I
I
V
Nd
V
N
Vo




Where VIN_RMS is the rate input voltage; IP is the primary inductance current. NPS is the turns ratio of Flyback transformer (NPS=1 for Buck-boost);
IO_MEAN is the mean output current; VO is the output voltage.
The switching frequency is not constant for AL1663/AL1663R due to boundary conduction mode. To set the minimum switching frequency fMIN at
the crest of the minimum AC input, primary inductance can be obtained by below formula.
_
_
2
( 2
)
IN
RMS
PS
O
P
P
IN
RMS
PS
O
MIN
V
N
V
L
I
V
N V
f
Where VIN_RMS is the rate input voltage; IP is the primary inductance current. NPS is the turns ratio of Flyback transformer (NPS=1 for Buck-boost);
IO_MEAN is the mean output current; VO is the output voltage; fMIN is the minimum switching frequency at the crest of the minimum AC input.
According to the Faraday’s Law, the winding number of the inductance can be calculated by:
PP
P
em
LI
N
AB
P
S
PS
N
N
N
Where,
Ae is the core effective area.
Bm is the maximum magnetic flux density.



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