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.
For example, to program the output voltage of the DNS
module to 3.3Vdc, Rtrim is calculated as follows:
Rtrim
:=
⎜
⎛
10500
−
1000
⎞
⋅ Ω
⎟
⎝
2.5475
⎠
Rtrim = 3.122 kΩ
DNS can also be programmed by applying a voltage
between the TRIM and GND pins (Figure 24). 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
⎤
⎣
⎦
Output Voltage Programming
The output voltage of the DNS can be programmed to
any voltage between 0.75Vdc and 5.0Vdc by connecting
one resistor (shown as Rtrim in Figure 23) 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:
Vtrim is the external voltage in V
Vo is the desired output voltage
For example, to program the output voltage of a DNS
module to 3.3 Vdc, Vtrim is calculated as follows
Vtrim
:=
0.7
−
(
2.5475
⋅
0.0667
)
⎛
10500
−
1000
⎞
⋅ Ω
Rtrim
:=
⎜
⎟
⎝
Vo
−
0.7525
⎠
Rtrim is the external resistor in
Ω
Vo is the desired output voltage
Vtrim = 0.530V
Figure 23:
Circuit configuration for programming output voltage
using an external resistor
Figure 24:
Circuit Configuration for programming output voltage
using external voltage source
DS_DNS10SIP06_03092009
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DELTA [ DELTA ELECTRONICS, INC. ]
