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YNS05S16 DC-DC Converter Data Sheet
3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 16 A
– sinking up to 1.2 mA at a low level voltage of
? 0.8 V
– sourcing up to 0.25 mA at a high logic level of
2.3 to 5.5 V.
When using open-collector (open-drain) transistor
with a negative logic option, add a pull-up resistor
(R*) to Vin as shown in Fig. C:
– 20 k ? , if the minimum Vin is 4.5 V
– 10 k ? , if the minimum Vin is 3.0 V
– 5 k ? , if the undervoltage shutdown at 2.05 to
2.15 V is required.
Remote Sense (Pin 2)
The remote sense feature of the converter
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 to 3.63 VDC by connecting an external
resistor between TRIM pin (Pin 3) and GND pin (Pin
5); see Fig. E. Note that when a trim resistor is not
connected, the output voltage of the converter is
0.7525 VDC.
compensates for voltage drops occurring only
between Vout pin (Pin 4) of the converter and the
load. The SENSE (Pin 2) pin should be connected at
the load or at the point where regulation is required
(see Fig. D). There is no sense feature on the output
Vin
Vin
ON/OFF
Y-Series
Converter
(Top View)
SENSE
Vout
GND return pin, where the solid ground plane should
provide a low voltage drop.
GND
TRIM
R TRIM
Rload
Vin
Y-Series
Converter
(Top View)
SENSE
Rw
Fig. E: Configuration for programming output voltage.
Vin
ON/OFF
Vout
A trim resistor, R TRIM , for a desired output voltage
can be calculated using the following equation:
GND
TRIM
Rload
R T RIM ?
21 . 07
(V O - REQ - 0.7525)
? 5 . 11
[k ? ]
Fig. D: Remote sense circuit configuration.
Rw
where,
R TRIM ? Required value of trim resistor [k ? ]
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 traces 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
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.
The 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.
MCD10194 Rev. 1.0, 21-Jun-10
Page 6 of 25
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