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參數(shù)資料
| 型號： | QHS12ZHN-T |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 14 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, PACKAGE-8 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 206K |
| 代理商： | QHS12ZHN-T |
DEC 09, 2004 revised to APR 12, 2006
Page 7 of 10
www.power-one.com
QHS DC-DC Series Data Sheet
Typical Application
Figure 9 shows the recommended connections for the
QHS Series converter.
+Vo
+Sense
Trim
-Sense
-Vo
-Vi
+Vi
On/Off
Fuse
C1
C2
C3
QHS40ZX
Figure 9. Typical Application of the QHS Series
The QHS Series converters do not require any external
components for proper operation.
However, if the
distribution of the input voltage to the converter contains
significant inductance, the capacitor C1 may be
required to enhance performance of the converter. A
minimum of a 33 μF electrolytic capacitor with the
ESR<0.7
Ω is recommended for the QHS Series.
Refer to the “Inrush Current Control Application Note”
on www.power-one.com for suggestions on how to limit
the magnitude of the inrush current.
For output decoupling we recommend using a 10 μF
tantalum and a 1 μF ceramic capacitors connected
directly across the output pins of the converter. Note,
that the capacitors do not substitute the filtering
required by the load.
Shutdown Feature Description
The ON/OFF pin in the QHS Series converters
functions as a normal soft shutdown. It is referenced to
the –Vin pin (see Figure 7). With the positive logic,
when the ON/OFF pin is pulled low, the output is turned
off and the unit goes into a very low input power mode.
With negative logic, when the ON/OFF pin is pulled low,
the unit is turned on.
An open collector switch is recommended to control the
voltage between the ON/OFF pin and the -Vin pin of the
converter. The ON/OFF pin is pulled up internally, so
no external voltage source is required. The user should
avoid connecting a resistor between the ON/OFF pin
and the +Vin pin.
When the ON/OFF pin is used to achieve remote
control, the user must take care to insure that the pin
reference for the control is really the -Vin pin. The
control signal must not be referenced ahead of EMI
filtering, or remotely from the unit.
Optically
coupling the information and locating the optical
coupler directly at the module will solve any of
these problems.
Note:
If the ON/OFF pin is not used, it can be left floating (positive
logic), or connected to the -Vin pin (negative logic).
Output Voltage Trim
Industry Standard Trim
The units trim up with a resistor from the TRIM pin
to the +Sense pin and trim down with a resistor
from the TRIM pin to the –Sense pin as shown in
Figure 10.
Figure 10. QHS Series Positive Trim Schematic
The equations below determine the trim resistor
value required to achieve a ΔV change in the
output voltage.
Ω
Δ
Δ
+
=
k
Vo
up
Radj
)
2
.
10
%
510
%
225
.
1
%)
100
(
1
.
5
Ω
Δ
=
k
down
Radj
)
2
.
10
%
510
where ΔV% is the output voltage change
expressed in percents of the nominal output
voltage, Vout.
Notes:
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