Datasheet

Application Note
Created by Traco Electronic AG Arp. www.tracopower.com Date: May 31
th
, 2013 / Rev.: 1.2
/
Page 46 / 52
20W Single & Dual Output
Output Voltage Adjustment
Output voltage set point adjustment allows the user to increase or decrease the output voltage set point of a module. This is
accomplished by connecting an external resistor between the TRIM pin and either the +V
out
or -V
out
pins. With an external resistor
between the TRIM and -V
out
pin, the output voltage set point increases. With an external resistor between the TRIM and +V
out
pin,
the output voltage set point decreases.
 Trim up equation

,
U
Oup
GL
RH
VLK






 Trim down equation


,
,
O down
D
OOdown
VLG
RH
VV







 Trim constants
Module G H K L
THN 20-xx10 5110 2050 0.8 2.5
THN 20-xx11 5110 2050 2.5 2.5
THN 20-xx12 10000 5110 9.5 2.5
THN 20-xx13 10000 5110 12.5 2.5
+Vout
Trim
-Vout
+Vin
-Vin
RU
RD
TRIM TABLE
THN 20-xx10
Trim up (%) 1 2 3 4 5 6 7 8 9 10
V
OUT
(Volts) = 3.333 3.366 3.399 3.432 3.465 3.498 3.531 3.564 3.597 3.630
R
U
(KΩ) = 385.071 191.511 126.990 94.730 75.374 62.470 53.253 46.340 40.963 36.662
Trim down (%) 1 2 3 4 5 6 7 8 9 10
V
OUT
(Volts) = 3.267 3.234 3.201 3.168 3.135 3.102 3.069 3.036 3.003 2.970
R
D
(KΩ) = 116.719 54.779 34.133 23.810 17.616 13.486 10.537 8.325 6.604 5.228
THN 20-xx11
Trim up (%) 1 2 3 4 5 6 7 8 9 10
V
OUT
(Volts) = 5.050 5.100 5.150 5.200 5.250 5.300 5.350 5.400 5.450 5.500
R
U
(KΩ) = 253.450 125.700 83.117 61.825 49.050 40.533 34.450 29.888 26.339 23.500
Trim down (%) 1 2 3 4 5 6 7 8 9 10
V
OUT
(Volts) = 4.950 4.900 4.850 4.800 4.750 4.700 4.650 4.600 4.550 4.500
R
D
(KΩ) = 248.340 120.590 78.007 56.715 43.940 35.423 29.340 24.778 21.229 18.390
THN 20-xx12
Trim up (%) 1 2 3 4 5 6 7 8 9 10
V
OUT
(Volts)= 12.120 12.240 12.360 12.480 12.600 12.720 12.840 12.960 13.080 13.200
R
U
(KΩ)= 203.223 99.057 64.334 46.973 36.557 29.612 24.652 20.932 18.038 15.723
Trim down (%) 1 2 3 4 5 6 7 8 9 10
V
OUT
(Volts)= 11.880 11.760 11.640 11.520 11.400 11.280 11.160 11.040 10.920 10.800
R
D
(KΩ)= 776.557 380.723 248.779 182.807 143.223 116.834 97.985 83.848 72.853 64.057
THN 20-xx13
Trim up (%) 1 2 3 4 5 6 7 8 9 10
V
OUT
(Volts)= 15.150 15.300 15.450 15.600 15.750 15.900 16.050 16.200 16.350 16.500
R
U
(KΩ)= 161.557 78.223 50.446 36.557 28.223 22.668 18.700 15.723 13.409 11.557
Trim down (%) 1 2 3 4 5 6 7 8 9 10
V
OUT
(Volts)= 14.850 14.700 14.550 14.400 14.250 14.100 13.950 13.800 13.650 13.500
R
D
(KΩ)= 818.223 401.557 262.668 193.223 151.557 123.779 103.938 89.057 77.483 68.223