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YS05S10 DC-DC Converter Data Sheet
3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 10 A
Vin
Y-Series
Converter
SENSE
Vin
Y-Series
Converter
SENSE
ON/OFF
(Top View)
Vout
Rw
ON/OFF
(Top View)
Vout
Vin
Vin
GND
TRIM
Rload
GND
TRIM
Rload
R TRIM
Rw
R T RIM ?
? 5 . 11
[k ? ]
V 0-REG [V] R TRIM [k ? ]
Fig. B: Remote sense circuit configuration.
If remote sensing is not required, the SENSE pin
must be connected to the Vout pin (Pin 4) to ensure
the converter will regulate at the specified output
voltage. If these connections are not made, the
converter will deliver an output voltage that is slightly
higher than the specified value.
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 ensure
optimum performance.
When utilizing the remote sense feature, care must
be taken not to exceed the maximum allowable
output power capability of the converter, which is
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 the
converter can be increased up to 0.5 V 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.
Output Voltage Programming (Pin 3)
The output voltage can be programmed from
0.7525 V to 3.63 V by connecting an external resistor
between TRIM pin (Pin 3) and GND pin (Pin 5); see
Fig. C. Note that when a trim resistor is not
connected, the output voltage of the converter is
0.7525 V.
Fig. C: Configuration for programming output voltage.
A trim resistor, R TRIM , for a desired output voltage
can be calculated using the following equation:
21 . 07
(V O - REQ - 0.7525)
where,
R TRIM ? Required value of trim resistor [k ? ]
V O ? REQ ? Desired (trimmed) output voltage [V]
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.
Table 1: Trim Resistor Value
The Closest
Standard Value [k ? ]
0.7525 open
1.0 80.0 80.6
1.2 41.97 42.2
1.5 23.1 23.2
1.8 15 15
2.0 11.78 11.8
2.5 6.95 6.98
3.3 3.16 3.16
3.63 2.21 2.21
The output voltage can also be programmed by
external voltage source. To make trimming less
sensitive, a series external resistor Rext is
recommended between TRIM pin and programming
voltage source. Control Voltage can be calculated by
the formula:
MCD10204 Rev. 1.0, 24-Jun-10
Page 6 of 30
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