Datasheet
DS_DNL10SMD_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 DNL 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 DNL 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 DNL
module to 3.3Vdc, Rtrim is calculated as follows:
Rtrim
10500
2.5475
1000
Rtrim = 3.122 kΩ
DNL 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 DNL
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