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UCY2G150MPD Scheda tecnica(PDF) 6 Page - Diodes Incorporated

Il numero della parte UCY2G150MPD
Spiegazioni elettronici  High Power Factor LED Replacement T8 Fluorescent Tube
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Produttore elettronici  DIODES [Diodes Incorporated]
Homepage  http://www.diodes.com
Logo DIODES - Diodes Incorporated

UCY2G150MPD Scheda tecnica(HTML) 6 Page - Diodes Incorporated

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AN75
Issue 1 – January 2011
6
www.diodes.com
© Diodes Incorporated 2010
Free-wheel diode calculation
The free-wheel diode D
F shown in Figure 1 is chosen based on its maximum stress voltage and total
power loss. The maximum stress voltage rating of the free-wheel diode is the same as the MOSFET. It
is advisable to use ultra-low reverse recovery time T
RR (<35ns) diode as DF to reduce the MOSFET’s
switching ON loss. In the design example, 1A 600V rectifier, MUR160, is selected.
The worst case average current through the diode occurs at V
LED(max) and VIN(min).
mA
202
V
373
V
42
1
mA
240
V
V
1
I
I
(max)
IN
(min)
LED
)
nom
(
LED
D(avg)
=
⎛ −
×
=
×
=
Assuming a constant forward voltage drop V
F across the diode, the conduction power loss can be
calculated,
mW
222
V
1
.
1
mA
202
V
I
P
F
)
avg
(
D
COND
_
D
=
×
=
×
=
Finally, the diode junction temperature without using the heat sink can be calculated from,
C
87
C
80
W
C
32
mW
222
T
θ
P
T
AMB
thJA
COND
_
D
j
o
o
o
=
+
×
=
+
×
=
The internal ambient temperature within the LED converter, T
AMB, is assumed to be 80ºC. θthJA =
W
C
32 o
is the thermal resistance for DO-201 package. For practical design, it is recommended to
keep the junction temperature below 110ºC to avoid temperature stress on the device.


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