UNR-1.8/10-D5SM-C View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
UNR-1.8/10-D5SM-C
Unspecified
UNR-1.8/10-D5SM-C Datasheet PDF : 9 Pages
| |||
UNR D5/D12 Series
Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT
8 and 10 Amp DC/DC Converters
+INPUT
INPUT
RETURN
+OUTPUT
TRIM
OUTPUT
RETURN
20kΩ
5-10
Turns
LOAD
Figure 3. Trim Connections Using a Trimpot
A trimpot can be used to determine the value of a single fixed resistor which
should be connected, as shown in Figure 4, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Output
Return to trim up the output voltage. Fixed resistors should be metal-film
types with absolute TCR’s less than 100ppm/°C to ensure stability.
The equations below can be used as starting points for selecting specific
trim-resistor values. Recall that untrimmed devices are guaranteed to be
between ±1% and ±2% accurate, depending on model. See Performance
and Functional Specifications.
+INPUT
+OUTPUT
TRIM
Trim
Down
LOAD
INPUT
Trim Up
RETURN
OUTPUT
Note: Install either a fixed trim-uRpErTeUsiRstNor or a fixed trim-down resistor
depending upon desired output voltage.
Figure 4. Trim Connections Using Fixed Resistors
UNR-1.8/10-D5T
UNR-1.8/10-D5SM
UNR-2.5/10-D5T
UNR-2.5/10-D5SM
UNR-3.3/8-D5T
UNR-3.3/8-D5SM
UNR-3.3/10-D5T
UNR-3.3/10-D5SM
UNR-3.3/8-D12T
UNR-3.3/8-D12SM
UNR-3.3/10-D12T
UNR-3.3/10-D12SM
RTDOWN (kΩ) =
2.49(VO – 1.26)
1.8 – VO
–1.74
RTUP (kΩ) =
3.14
–1.74
VO – 1.8
RTDOWN (kΩ) =
7.5(VO – 1.26)
2.5 – VO
–1.74
RTUP (kΩ) =
9.47
VO – 2.5
–1.74
RTDOWN (kΩ) =
7.5(VO – 1.27)
3.3 – VO
–1.0
RTUP (kΩ) =
9.5
VO – 3.3
–1.0
RTDOWN (kΩ) =
7.5(VO – 1.26)
3.3 – VO
–1.0
RTUP (kΩ) =
9.41
VO – 3.3
–1.0
Note: Resistor values are in kΩ. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted output accuracy.
VO = desired output voltage.
www.murata-ps.com/support
UNR18-33W.C01 Page 5 of 9
Share Link: