CYNTEC VPN12AD02-FU Manuel

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Constant Current for LED Driver Application
ELECTRICAL SPECIFICATION:
Parameters
Input UVLO Falling
Input UVLO Rising
Output OVP / UVP / LED series number
Output OVP / UVP / LED series number
Switching Frequency
LED current
PROGRAMMING OUTPUT VOLTAGE:
Input UVLO Setting
Input under voltage shutdown levels can both be defined through an external resistor divider.
EN/INUVLO pin voltages are internally compared to their respective thresholds shown as the following
equations. It is recommended that choose R2=10kohm, and R1 can be calculated by following equation.
Input under voltage falling threshold V
Input under voltage threshold hysteresis V
rising. Following is some examples for R1, R2 selection.
(
+
UVth =
1
Output OVP Setting
The output OVP can be set by the external dividing resistor. VFB typical value is 1.46V. Following are
some output voltage examples.
VOUT_OVP
R22 = R23 x (
EN/INUVLOTH
R1
.
)
V
EN/INUVLOTH
R2
Table 1: Parameter Value Setting
VIN UVLO Falling
VIN UVLO Rising
R1 (Ω)
R2 (Ω)
-1)
VFB
VPN12AD02-FU EVB GUIDE
Value
7V
7.4V
17.6V / 6.8V / 3 ~ 4 LEDs
33.8V / 13V / 5 ~ 8 LEDs
350kHz
1.5A
typical is 1.75V for calculating the VIN UVLO falling.
typical is 90mV for calculating the VIN UVLO
EN/INUVLO_HYS
7V
7.4V
30k
10k
1
Note
JR25 Jumper short
JR25 Jumper open
Rev. P05