CYNTEC VPN12AD02-FU Посібник - Сторінка 6

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Frequency Setting
The switching frequency can be set from 200 kHz to 400 kHz by an external resistor. Select the
switching frequency with an external resistor according to the following approximate formulas.
46023
R
[k Ω ] =
FREQ

Output Voltage Setting

For a voltage regulator, the output voltage can be set by selecting the values R20, R21 according to
the following equation. IFBL typical value is 30uA. V
V
FBH-FBL
V
=
(
OUT
R20
VPN12AD02-FU EVB GUIDE
VOUT
VFB
GND
Figure 4: VFB Protection Pin
Table 7: Parameter Value Setting
VOUT OVP
Short Protection
R
(Ω)
VFBH
R
(Ω)
VFBL
1.25
.
(
)
F
[kHz]
SW
Table 8: Parameter Value Setting
Vout
R12 (Ω)
I
) R21 +V
FBL
FBH-FBL
Table 9: Parameter Value Setting
Vout
R20 (Ω)
R21 (Ω)
VOUT
R
VFBH
R
VFBL
15.1V
5.8V
=R22 =14k
=R23 =1.5k
350kHz
30k
typical value is 150mV.
FBH-FBL
12.1V
150
12.4k
6
Rev. P05