Rev. P05
6
VPN12AD02-FU EVB GUIDE
R
VFBL
VOUT
R
VFBH
GND
VFB
VOUT
Figure 4: VFB Protection Pin
Table 7: Parameter Value Setting
VOUT OVP
15.1V
Short Protection
5.8V
R
VFBH
(
Ω
)
=R22 =14k
R
VFBL
(
Ω
)
=R23 =1.5k
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
F
SW
[kHz]
(
)
1.25
R
FREQ
[k
Ω
]
=
.
Table 8: Parameter Value Setting
Vout
350kHz
R12 (
Ω
)
30k
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
FBH-FBL
typical value is 150mV.
V
OUT
=
V
FBH-FBL
R20
(
I
FBL
) R21 +V
FBH-FBL
Table 9: Parameter Value Setting
Vout
12.1V
R20 (
Ω
)
150
R21 (
Ω
)
12.4k
