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參數(shù)資料
| 型號： | YNC05S20-D |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 23/26頁 |
| 文件大?。?/td> | 386K |
| 代理商： | YNC05S20-D |
OCT 02, 2006 revised to APR 23, 2007
Page 6 of 26
www.power-one.com
YNC05S20 DC-DC Converter Data Sheet
4.5-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 20A
Vin
Rw
Rload
Vin
GND
ON/OFF
(Top View)
Converter
TRIM
SENSE
Vout
Nex -c Series
TM
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 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
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 GDN 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.
Vin
R
TRIM
Rload
Converter
Vin
GND
ON/OFF
(Top View)
TRIM
Vout
SENSE
Nex -c Series
TM
Fig. C: Configuration for programming output voltage.
A trim resistor, RTRIM, for a desired output voltage
can be calculated using the following equation:
11
.
5
0.7525)
-
(V
07
.
21
R
REQ
-
O
RIM
T
=
[k
Ω]
where,
=
TRIM
R
Required value of trim resistor [k
Ω]
=
REQ
O
V
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
V0-REG [V]
RTRIM [k]
The Closest
Standard Value [k]
0.7525
open
1.0
80.02
80.6
1.2
41.97
42.2
1.5
23.08
23.2
1.8
15.00
15.0
2.0
11.78
11.8
2.5
6.95
6.98
3.3
3.16
3.63
2.21
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