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YNS12S16 DC-DC Converter Data Sheet
9.6-14 VDC Input; 0.7525-5.5 VDC Programmable @ 16 A
Nex - s Series
Nex - s Series
Vin
TM
Converter
SENSE
Vin
TM
Converter
SENSE
(Top View)
Rw
(Top View)
Vin
ON/OFF
Vout
Vin
ON/OFF
Vout
GND
TRIM
Rload
GND
TRIM
Rload
R TRIM
Rw
Fig. B: Remote sense circuit configuration.
Because the sense lead carries minimal current,
large trace on the end-user board are not required.
However, sense trace should be located close to a
ground plane to minimize system noise and insure
optimum performance.
When utilizing the remote sense feature, care
must be taken not to exceed the maximum
allowable output power capability of the converter,
equal to the product of the nominal output voltage
and the allowable output current for the given
conditions.
When using remote sense, the output voltage at
Fig. C: Configuration for programming output voltage.
Note that the tolerance of a trim resistor directly
affects the output voltage tolerance. It is
recommended to use standard 1% or 0.5%
resistors; for tighter tolerance, two resistors in
parallel are recommended rather than one
standard value from Table 1.
Ground pin of the trim resistor should be
connected directly to the converter GND pin (Pin
5) with no voltage drop in between. Table 1
provides the trim resistor values for popular output
voltages.
R TRIM [k ? ]
the converter can be increased up to 0.5V above
the nominal rating in order to maintain the required
voltage across the load. Therefore, the designer
must, if necessary, decrease the maximum current
(originally obtained from the derating curves) by
the same percentage to ensure the converter’s
actual output power remains at or below the
maximum allowable output power.
V 0-REG [V]
0.7525
1.0
1.2
1.5
1.8
Table 1: Trim Resistor Value
The Closest
Standard Value [k ? ]
open
41.2 41.2
22.46 22.6
13.0 13.0
9.0 9.09
Output Voltage Programming (Pin 3)
The output voltage can be programmed from
0.7525V to 5.5V by connecting an external resistor
between TRIM pin (Pin 3) and GND pin (Pin 5);
2.0
2.5
3.3
5.0
5.5
7.4
5.0
3.12
1.47
1.21
7.32
4.99
3.09
1.47
1.21
see Fig. C.
A trim resistor, R TRIM , for a desired output voltage
can be calculated using the following equation:
The output voltage can be also programmed by
external voltage source. To make trimming less
sensitive, a series external resistor Rext is
R T RIM ?
10 . 5
(V O - REQ - 0.7525)
? 1
[k ? ]
recommended between TRIM pin and
programming voltage source. Control Voltage can
be calculated by the formula:
where,
R TRIM ? Required value of trim resistor [k ? ]
V O ? REQ ? Desired (trimmed) output voltage [V]
V CTRL ? 0 . 7 ?
where,
(1 ? R EXT )(V O -REQ - 0.7525)
15
[V]
V CTRL ? Control voltage [V]
R EXT ? External resistor between TRIM pin and
voltage source; the value can be chosen
MCD10196 Rev. 1.0, 21-Jun-10
Page 6 of 27
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