CYNTEC VPN12AD02-FU User manual

Rev. P05
1
VPN12AD02-FU EVB GUIDE
Constant Current for LED Driver Application
ELECTRICAL SPECIFICATION:
Parameters Value Note
Input UVLO Falling 7V
Input UVLO Rising 7.4V
Output OVP / UVP / LED series number 17.6V / 6.8V / 3 ~ 4 LEDs JR25 Jumper short
Output OVP / UVP / LED series number 33.8V / 13V / 5 ~ 8 LEDs JR25 Jumper open
Switching Frequency 350kHz
LED current 1.5A
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 VEN/INUVLOTH typical is 1.75V for calculating the VIN UVLO falling.
Input under voltage threshold hysteresis VEN/INUVLO_HYS typical is 90mV for calculating the VIN UVLO
rising. Following is some examples for R1, R2 selection.
UVth = R1
R2
(+) VEN/INUVLOTH
1.
Table 1: Parameter Value Setting
VIN UVLO Falling 7V
VIN UVLO Rising 7.4V
R1 (Ω) 30k
R2 (Ω) 10k
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.
R22 = R23 x ( -1)
VOUT_OVP
VFB

Rev. P05
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VPN12AD02-FU EVB GUIDE
RVFBL
VOUT
RVFBH
GND
VFB
VOUT
Figure 1: VFB Protection Pin
Table 2: Parameter Value Setting
OVP 33.8V 17.6V
Short Protection 13V 6.8V
Jumper JR25 open short
RVFBH (Ω) =R22 =32.2k =R22//R25 =16.6k
RVFBL (Ω) =R23=1.5k =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
RFREQ[k
Ω
] =.
Table 3: Parameter Value Setting
Vout 250kHz 350kHz 400kHz
R12 (Ω) 46.4k 30k 25.5k
LED Constant Current Setting
VFBH-FBL typical value is 150mV. Set the LED current with an external resistor according to the
following approximate formulas.
I
LED
=V
FBH-FBL
R26
Table 4: Parameter Value Setting
ILED 1A 1.5A 2A
R26 (Ω) 150m 100m 75m

Rev. P05
3
VPN12AD02-FU EVB GUIDE
EVALUATION BOARD SCHEMATIC:
Figure 2: Schematic
BOM LIST:
Table 5: The BOM without EMI solution
Count Part Reference Description
1 U1 VPN12AD02-FU
4 C12, C14, C20, C22 MLCC, 10uF, 50V, X7R, 1210
1 C17 MLCC, 10uF, 25V, X7S, 0805
2 C9, C15 MLCC, 22nF, 25V, X7R, 0402
2 R2, R16, R18 RES, 10Kohm, 0402 1%
2 R9, R10 RES, 100Kohm, 0402 1%
1 R22, R25 RES, 33.2Kohm, 0402 1%
2 R23 RES, 1.5Kohm, 0402 1%
1 R1, R12 RES, 30Kohm, 0402 1%
6 R4, R24, R27 RES, 0ohm, 0402
1 R5, R5-1 Short
1 R26 RES, 100mohm, 1206 1%
22
L2, L6, C3, C6, C10, C11, C13, C16, C18,
C19 ,C21,C23, C24, C25, R26-1, R17, R19,
R11, R8, R28, R20, R21
NC

Rev. P05
4
VPN12AD02-FU EVB GUIDE
QUICK START GUIDE:
Power on/off
1. Connect 3~4 LEDs from VOUT to GND if jumper JR25 is short, Connect 5~8 LEDs from VOUT
to GND if jumper is open.
2. Short the jumper JR16 and JR18
3. Give Power from VIN to GND (without EMI solution), from EMIIN to EMIG (with EMI solution)
4. Open the Disable jumper to enable VPN12AD02-FU
5. Short the Disable jumper to disable VPN12AD02-FU
Digital and analog dimming
1. For digital dimming, open JR18 and give the PWM signal to PWMI pin.
2. For analog dimming, open JR16 and give the analog signal to SET pin.
Frequency Spread Spectrum
1. Add R11=10kohm to enable Frequency Spread Spectrum.
2. Remove R11 to disable Frequency Spread Spectrum.
Input Power
Output Load
JR25
JR16
JR18
Figure 3: Quick Start Guide for Constant Current Application

Rev. P05
5
VPN12AD02-FU EVB GUIDE
Constant Voltage Application
ELECTRICAL SPECIFICATION:
Parameters Value Note
Output Voltage 12V
Input UVLO Falling 7V
Input UVLO Rising 7.4V
Output OVP 15V
Output Short 6V
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 VEN/INUVLOTH typical is 1.75V for calculating the VIN UVLO falling.
Input under voltage threshold hysteresis VEN/INUVLO_HYS typical is 90mV for calculating the VIN UVLO
rising. Following is some examples for R1, R2 selection.
UVth = R1
R2
(+) VEN/INUVLOTH
1.
Table 6: Parameter Value Setting
VIN UVLO Falling 7V
VIN UVLO Rising 7.4V
R1 (Ω) 30k
R2 (Ω) 10k
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.
R22 = R23 x ( -1)
VOUT_OVP
VFB

Rev. P05
6
VPN12AD02-FU EVB GUIDE
RVFBL
VOUT
RVFBH
GND
VFB
VOUT
Figure 4: VFB Protection Pin
Table 7: Parameter Value Setting
VOUT OVP 15.1V
Short Protection 5.8V
RVFBH (Ω) =R22 =14k
RVFBL (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
RFREQ[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. VFBH-FBL typical value is 150mV.
VOUT =VFBH-FBL
R20
( IFBL ) R21 +VFBH-FBL
Table 9: Parameter Value Setting
Vout 12.1V
R20 (Ω) 150
R21 (Ω) 12.4k

Rev. P05
7
VPN12AD02-FU EVB GUIDE
EVALUATION BOARD SCHEMATIC:
Figure 5: Schematic

Rev. P05
8
VPN12AD02-FU EVB GUIDE
BOM LIST:
Table 10: The BOM without EMI solution
COUNT REF DES DESCRIPTION
1 U1 VPN12AD02-FUV
2 C12, C14, MLCC, 10uF, 50V, X7R, 1210
2 C20, C22 MLCC, 22uF, 25V, X7R, 1206
1 C11 E-cap, 82uF, 50V
1 C24 E-cap, 270uF, 16V
1 C17 MLCC, 10uF, 10V, X7R, 0805
1 C10 MLCC, 2.2nF, 25V, X7R, 0402
1 C25 MLCC, 4.7nF, 16V, X7R, 0402
1 C15 MLCC, 22nF, 16V, X7R, 0402
1 R28 RES, 5.6Kohm, 0402 1%
2 R2, R16, R18 RES, 10Kohm, 0402 1%
2 R9, R10 RES, 100Kohm, 0402 1%
1 R8 RES, 1Kohm, 0402 1%
1 R22 RES, 14Kohm, 0402 1%
2 R23 RES, 1.5Kohm, 0402 1%
1 R1, R12 RES, 30Kohm, 0402 1%
1 R4, R24 RES, 0ohm, 0402
1 R20 RES, 150ohm, 0402 1%
1 R21 RES, 12.4Kohm, 0402 1%
6 R5, R5-1, R26,
R26-1, JR16, JR18
Short
16
L2, L6, C3, C9,
C13, C16, C18,
C19, C21, C23,
R11, R17, R19,
R25, R27, JR25
NC

Rev. P05
9
VPN12AD02-FU EVB GUIDE
QUICK START GUIDE:
Power on/off
1. Give Power from VIN to GND as following figure.
2. Open the Disable Jumper to enable VPN12AD02-FUV
3. Short the Disable Jumper to disable VPN12AD02-FUV
Frequency spread spectrum
1. Give R11=10kΩ to enable frequency spread spectrum
2. Remove R11 to disable frequency spread spectrum
Input Power
JR25
JR16
JR18
Output Load
Figure 6: Quick Start Guide for Constant Voltage Application

Rev. P05
10
VPN12AD02-FU EVB GUIDE
PRIENTED CIRCUIT BOARD LAYOUT:
Figure 7: First layer (Top layer)
Figure 8: Second layer