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DNS04SMD06 Datasheet(PDF) 11 Page - Delta Electronics, Inc.

Part No. DNS04SMD06
Description  Voltage and resistor-based trim
Download  17 Pages
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Manufacturer  DELTA [Delta Electronics, Inc.]
Direct Link  http://www.deltaww.com
Logo DELTA - Delta Electronics, Inc.

DNS04SMD06 Datasheet(HTML) 11 Page - Delta Electronics, Inc.

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DS_DNS04SMD6A_07182012
11
The output voltage tracking feature (Figure 40 to Figure
42) is achieved according to the different external
connections. If the tracking feature is not used, the
TRACK pin of the module can be left unconnected or tied
to Vin.
For proper voltage tracking, input voltage of the tracking
power module must be applied in advance, and the
remote on/off pin has to be in turn-on status. (Negative
logic: Tied to GND or unconnected. Positive logic: Tied to
Vin or unconnected)
Figure 40: Sequential Start-up
Figure 41: Simultaneous
Figure 42: Ratio-metric
FEATURE DESCRIPTIONS (CON.)
The amount of power delivered by the module is the
voltage at the output terminals multiplied by the output
current. When using the trim feature, the output voltage of
the module can be increased, which at the same output
current would increase the power output of the module.
Care should be taken to ensure that the maximum output
power of the module must not exceed the maximum rated
power (Vo.set x Io.max ≤ P max).
Voltage Margining
Output voltage margining can be implemented in the DNS
modules by connecting a resistor, R margin-up, from the Trim
pin to the ground pin for margining-up the output voltage
and by connecting a resistor, Rmargin-down, from the Trim pin
to the output pin for margining-down. Figure 39 shows the
circuit configuration for output voltage margining. If
unused, leave the trim pin unconnected. A calculation tool
is
available
from
the
evaluation
procedure
which
computes the values of R margin-up and
Rmargin-down for a
specific output voltage and margin percentage.
Vo
On/Off
Vin
GND
Trim
Q2
Q1
Rmargin-up
Rmargin-down
Rtrim
Figure 39: Circuit configuration for output voltage margining
Voltage Tracking
The DNS family was designed for applications that have
output voltage tracking requirements during power-up and
power-down.
The devices
have
a
TRACK
pin
to
implement three types of tracking method: sequential
start-up, simultaneous and ratio-metric. TRACK simplifies
the task of supply voltage tracking in a power system by
enabling modules to track each other, or any external
voltage, during power-up and power-down.
By connecting multiple modules together, customers can
get multiple modules to track their output voltages to the
voltage applied on the TRACK pin.
PS1
PS1
PS2
PS2
PS1
PS1
PS2
PS2
PS1
PS1
PS2
PS2
+
ΔV


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