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AL1666 Fiches technique(PDF) 13 Page - Diodes Incorporated

No de pièce AL1666
Description  HIGH PERFORMANCE DIMMABLE LED CONTROLLER
PDF  16 Pages
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Fabricant  DIODES [Diodes Incorporated]
Site Internet  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AL1666 Fiches technique(HTML) 13 Page - Diodes Incorporated

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AL1666
Document number: DS42417 Rev. 1 - 2
13 of 16
www.diodes.com
December 2019
© Diodes Incorporated
AL1666
Application Information (continued)
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 Figure 1;
VREF is internal reference voltage that is equal to 0.4V; 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 AL1666 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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