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YNV05T10 DC-DC Converter Data Sheet
3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 10A
ON/OFF pin is internally pulled-up to Vin for a
positive logic version, and pulled-down for a
negative logic version. A TTL or CMOS logic gate,
open collector (open drain) transistor can be used
to drive ON/OFF pin. When using open collector
(open drain) transistor with a negative logic option,
add a pull-up resistor (R*) of 10K to Vin as shown
in Fig. C. External pull-up resistor (R*) can be
increased to 20 K if minimum input voltage is more
than 4.5 V. This device must be capable of:
- sinking up to 0.6 mA at a low level voltage of
? 0.8 V
- sourcing up to 0.25 mA at a high logic level of
2.3 V – 5.5 V.
Remote Sense (Pin 3)
The remote sense feature of the converter
compensates for voltage drops occurring only
between Vout of the converter and the load. The
SENSE (Pin 3) pin should be connected at the
load or at the point where regulation is required
When using remote sense, the output voltage of
the converter can be increased up to 0.5 V above
the sense point voltage 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 9)
The output voltage can be programmed from
0.7525 V to 3.63 V by connecting an external
resistor between the TRIM pin (Pin 9) and the
GND pin (Pin 5); see Fig. E. Note that when a trim
resistor is not connected, the output voltage of the
converter is 0.7525V.
A trim resistor, R TRIM , for a desired output voltage
can be calculated using the following equation:
(see Fig. D). There is no sense feature on the
output GND return pin, where a solid ground plane
is recommended to provide a low voltage drop.
R T RIM ?
21 . 07
(V O - REQ - 0.7525)
? 5 . 11
[k ? ]
If remote sensing is not required, the SENSE pin
must be connected to the Vout to ensure the
converter will regulate at the specified output
voltage. If these connections are not made, the
where,
R TRIM ? Required value of trim resistor [k ? ]
V O ? REQ ? Desired (trimmed) output voltage [V]
Nex -v Series
converter will deliver an output voltage that is
slightly higher than the specified value.
7,8
Vin
TM
Converter
SENSE
3
Nex -v Series
7,8
Vin
TM
Converter
SENSE
3
Vin
10
ON/OFF
1,2,4
Vout
9
TRIM
Vin
10
ON/OFF
1,2,4
Vout
9
TRIM
Rw
Rload
6
GND
GND 5
R TRIM
Rload
6
GND
GND
5
Fig. E: Configuration for programming output voltage.
Rw
Fig. D: Remote sense circuit configuration.
Because the sense lead carries minimal current,
large trace on the end-user board is not required.
However, the 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.
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.
MCD10198 Rev. 1.0, 23-Jun-10
Page 6 of 26
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