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參數(shù)資料
| 型號： | YS05S16-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)： | 22/25頁 |
| 文件大?。?/td> | 425K |
| 代理商： | YS05S16-D |
OCT 18, 2006 revised to APR 10, 2007
Page 6 of 25
www.power-one.com
YS05S16 DC-DC Converter Data Sheet
3.0-5.5 VDC Input; 0.7525-3.63 VDC Programmable @ 16 A
The ON/OFF pin is internally pulled up to Vin for
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. This device must be capable of:
– 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 V - 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 - 2.15 V
is required.
Remote Sense (Pin 2)
The remote sense feature of the converter
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
GND return pin, where the solid ground plane should
provide a low voltage drop.
Vin
Rw
Rload
Vin
GND
ON/OFF
(Top View)
Converter
TRIM
SENSE
Vout
Y-Series
Fig. D: 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. E. Note that when a trim resistor is not
connected, the output voltage of the converter is
0.7525 V.
Vin
RTRIM
Rload
Converter
Vin
GND
ON/OFF
(Top View)
TRIM
Vout
SENSE
Y-Series
Fig. E: 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]
where,
=
TRIM
R
Required value of trim resistor [k]
=
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.
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