CYNTEC VPN12AD02-FU Manuel - Sayfa 2

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OVP
Short Protection
Jumper JR25
R
VFBH
R
VFBL

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
LED Constant Current Setting
V
typical value is 150mV. Set the LED current with an external resistor according to the
FBH-FBL
following approximate formulas.
= V
FBH-FBL
I
LED
R26
VOUT
VFB
GND
Figure 1: VFB Protection Pin
Table 2: Parameter Value Setting
33.8V
13V
open
(Ω)
=R22 =32.2k
(Ω)
=R23=1.5k
1.25
.
(
)
F
[kHz]
SW
Table 3: Parameter Value Setting
Vout
R12 (Ω)
Table 4: Parameter Value Setting
ILED
R26 (Ω)
VPN12AD02-FU EVB GUIDE
VOUT
R
VFBH
R
VFBL
17.6V
6.8V
short
=R22//R25 =16.6k
=R23=1.5k
250kHz
350kHz
46.4k
30k
1A
1.5A
150m
100m
2
400kHz
25.5k
2A
75m
Rev. P05