
DS_DNS04SMD6A_10202006 
10
Vo(V)
Vtrim(V)
Open
0.7525
1.2
1.5
1.8
2.5
3.3
0.624
0.573
0.522
0.403
0.267
Vo(V)
Rtrim(K
)
Open
0.7525
1.2
1.5
1.8
2.5
3.3
41.97
23.08
15.00
6.95
3.16
Table 2 
Vo
TRIM
GND
RLoad
Vtrim
+
_
Figure 38:
Circuit Configuration for programming output voltage 
using external voltage source
Table 1 provides Rtrim values required for some common
output voltages, while Table 2 provides value of external
voltage source, Vtrim, for the same common output
voltages. By using a 1% tolerance trim resistor, set point
tolerance of ±2% can be achieved as specified in the
electrical specification. 
Table 1 
Vo
TRIM
GND
RLoad
Rtrim
Figure 37:
Circuit configuration for programming output voltage 
using an external resistor
(
)
7525
.
1698
.
7
×
=
Vo
Vtrim
For example, to program the output voltage of a DNS
module to 3.3 Vdc, Vtrim is calculated as follows 
(
Vtrim
3
1698
.
7
×
=
)
V
267
.
7525
.
=
FEATURES DESCRIPTIONS
(CON.) 
Over-Temperature Protection 
The over-temperature protection consists of circuitry that 
provides protection from thermal damage. If the 
temperature exceeds the over-temperature threshold the 
module will shut down. The module will try to restart after 
shutdown. If the over-temperature condition still exists 
during restart, the module will shut down again. This 
restart trial will continue until the temperature is within 
specification. 
Remote Sense 
The DNS provide Vo remote sensing to achieve proper 
regulation at the load points and reduce effects of 
distribution losses on output line. In the event of an open 
remote sense line, the module shall maintain local sense 
regulation through an internal resistor. The module shall 
correct for a total of 0.5V of loss. The remote sense line 
impedance shall be < 10
. 
Distribution Losses
Distribution Losses
Vo
Sense
Vin
GND
RL
Distribution 
Distribution 
Figure 36: 
Effective circuit configuration for remote sense 
operation 
Output Voltage Programming 
The output voltage of the DNS can be programmed to any 
voltage between 0.75Vdc and 3.3Vdc by connecting one 
resistor (shown as Rtrim in Figure 37) between the TRIM 
and GND pins of the module. Without this external 
resistor, the output voltage of the module is 0.7525 Vdc. To 
calculate the value of the resistor Rtrim for a particular 
output voltage Vo, please use the following equation:   
7525
.
Vo
For example, to program the output voltage of the DNS
module to 1.8Vdc, Rtrim is calculated as follows:  
7525
.
8
DNS can also be programmed by apply a voltage between 
the TRIM and GND pins (Figure 38). The following 
equation can be used to determine the value of Vtrim 
needed for a desired output voltage Vo: 
=
5110
21070
Rtrim
=
=
K
Rtrim
15
5110
21070