Datasheet
www.recom-power.com
REV.: 0/2019 PD-3
DC/DC Converter
Specifications (measured @ Ta= 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
OUTPUT VOLTAGE TRIMMING
continued on next page
Output Voltage Trimming
It allows the user to increase or decrease the output voltage of the module. This is accomplished by connecting an external resistor between the Trim pin and
either the +Vout or -Vout pins. With an external resistor between the Trim and -Vout pin, the output voltage increases. With an external resistor between the
Trim and +Vout pin, the output voltage decreases. The values for trim resistors shown in trim tables below are according to standard E96 values; therefore, the
specified voltage may slightly vary.
R
up
-V
out
+V
out
Trim
R
down
Trim
Trim up Trim down
Vout
nom
R
1
R
2
k
u
V
ref
3.3VDC 5k1W 2kW 0.8
2.5VDC
5VDC 5k1W 2kW 2.5
12VDC 10kW 5k1W 9.5
15VDC 10kW 5k1W 12.5
24VDC 56kW 13kW 21.5
Practical Example RP12-11012SAR/P +10% / -10%:
Calculation:
Vout
nom
= nominal output voltage [VDC]
Vout
set
= trimmed output voltage [VDC]
V
ref
= reference voltage [VDC]
R
up
= trim up resistor [W]
R
down
= trim down resistor [W]
R
1
& R
2
= internal resistors [W]
k
u
= trim up factor [ ]
R
up
=
10k x 2.5
- 5k1 =
15k7W
13.2 - 2.5 - 9.5
R
up
according to E96 ≈ 15k8W R
down
according to E96 ≈ 63k4W
R
down
=
(10.8 - 2.5) x 10k
- 5k1 =
64k1W
12 - 10.8
R
down
=
(Vout
set
- V
ref
) x R
1
- R
2
Vout
nom
- Vout
set
R
up
=
R
1
x V
ref
- R
2
Vout
set
- V
ref
- k
u
Trim up
1 2 3 4 5 6 7 8 9 10 [%]
Vout
set
=
3.33 3.36 3.39 3.43 3.46 3.49 3.53 3.56 3.59 3.63 [VDC]
R
up
(E96) ≈
383k 191k 127k 95k3 75k 61k9 53k6 46k4 41k2 36k5 [W]
Trim up
1 2 3 4 5 6 7 8 9 10 [%]
Vout
set
=
5.05 5.10 5.15 5.20 5.25 5.30 5.35 5.40 5.45 5.50 [VDC]
R
up
(E96) ≈
255k 127k 82k5 61k9 48k7 40k2 34k8 301 26k1 23k7 [W]
RP12-1103.3SAR
RP12-11005SAR
Trim down
1 2 3 4 5 6 7 8 9 10 [%]
Vout
set
=
3.26 3.23 3.20 3.16 3.13 3.10 3.06 3.03 3.00 2.97 [VDC]
R
down
(E96) ≈
118k 54k9 34k 23k7 17k4 13k3 10k5 8k25 6k65 5k23 [W]
Trim down
1 2 3 4 5 6 7 8 9 10 [%]
Vout
set
=
4.95 4.90 4.85 4.80 4.75 4.70 4.65 4.60 4.55 4.50 [VDC]
R
down
(E96) ≈
249k 121k 78k7 56k2 44k2 35k7 29k4 24k9 21k 18k2 [W]
RP12-AR
Series