Datasheet

DS_DNM10SMD10_07182012
8
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 DNM 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 0.1V of loss. The remote sense line
impedance shall be < 10.
RL
Distribution Losses
Distribution Losses
Distribution LossesDistribution Losses
Vo
Vin
GND
Sense
Figure 23: Effective circuit configuration for remote sense
operation
Output Voltage Programming
The output voltage of the DNM can be programmed to
any voltage between 0.75Vdc and 5.0Vdc by connecting
one resistor (shown as Rtrim in Figure 24) 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:
Rtrim
10500
Vo 0.7525
1000







Rtrim is the external resistor in Ω
Vo is the desired output voltage
For example, to program the output voltage of the DNM
module to 3.3Vdc, Rtrim is calculated as follows:
Rtrim
10500
2.5475
1000







Rtrim = 3.122 kΩ
DNM can also be programmed by applying a voltage
between the TRIM and GND pins (Figure 25). The
following equation can be used to determine the value of
Vtrim needed for a desired output voltage Vo:
Vtrim 0.7 Vo 0.7525
 
0.0667





Vtrim is the external voltage in V
Vo is the desired output voltage
For example, to program the output voltage of a DNM
module to 3.3 Vdc, Vtrim is calculated as follows
Vtrim 0.7 2.5475 0.0667
 

Vtrim = 0.530V
Figure 24: Circuit configuration for programming output voltage
using an external resistor
Figure 25: Circuit Configuration for programming output voltage
using external voltage source