Boost Diode - ST STM32F103ZE User Manual

UM0877
3.3.7

Boost diode

The maximum current that can pass into the boost diode is:
Equation 24
Equation 25
The selected boost diode is the STTH12S06.
Equation 26
Equation 27
Equation 28
Now for the STTH12S06:
Equation 29
Equation 30
Equation 31
Equation 32
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P
= ⋅
out
I
Diode(rms)
V
in(pk)
min
I
avg
P
Diode(cond uction)
P
Diode(swit
⎛
1
= ⎜
P
Diode(swit ching)
⎝
2
=
P P
Diode(tot) Diode(cond
≅ +
P P P
PFC(tot) Bridge(tot ) MOSFET(tot
Doc ID 16854 Rev 1
STEVAL-ISF002V1 hardware description
⎛
⋅
16 V
⎜
1400
in(pk)
=
min
⎜
⋅ ⋅ π
⋅
3 V
185 2
⎝
out
=
I . 5 54 A
Diode(rms)
P
1400
= = =
out
A . 3 37
V 415
out
(
= ⋅ = ⋅
V I 1 5 . . 3 37
F avg
1
= ⋅ ⋅ ⋅
f V Q
ching) sw out
2
=
Q . 0 160 nC
rr
−
⋅ ⋅ 3 ⋅ ⋅ ⋅
80 10 415 160 10
(
+ =
P
uction) Diode(swit ching)
+ =
P ( 11
) Diode(tot)
⎞
⋅ ⋅
⎟
16 185 2
⋅
A
⎟
⋅ ⋅ π
3 415
⎠
A
)
≅
W 5 W
rr
⎞
9 ⎟ ≅
W . 2 65 W
⎠
)
+ ≅
5 . 2 65 W 8 W
+ + ≅
6 . 14 ) 8 W 34 W
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