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參數(shù)資料
| 型號： | HPQ-12/25-D48PXL2-Y |
| 廠商： | MURATA POWER SOLUTIONS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 306 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-8 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 794K |
| 代理商： | HPQ-12/25-D48PXL2-Y |
HPQ-12/25-D48 Series
Isolated 300-Watt Quarter Brick DC/DC Converters
www.murata-ps.com
email: sales@murata-ps.com
21 Feb 2011
MDC_HPQ-12/25-D48 Series.A07 Page 12 of 14
On/Off Enable Control Ground Bounce Protection
To improve reliability, if you use a small signal transistor or other external
circuit to select the Remote On/Off control, make sure to return the LO side
directly to the –Vin power input on the DC/DC converter. To avoid ground
bounce errors, do not connect the On/Off return to a distant ground plane or
current-carrying bus. If necessary, run a separate small return wire directly to
the –Vin terminal. There is very little current (typically 1-5 mA) on the On/Off
control however, large current changes on a return ground plane or ground bus
can accidentally trigger the converter on or off. If possible, mount the On/Off
transistor or other control circuit adjacent to the converter.
Figure 9. On/Off Enable Control Ground Bounce Protection
Preferred location
of On/Off control
adjacent to -Vin
terminal
DC/DC Converter
Install separate
return wire for
On/Off control
with remote
transistor
On/Off
Control
Transistor
Do not connect
control transistor
through remote
power bus
Ground plane or power return bus
+ Vin
On/Off Enable
-Vin return
Remote Sense Input (See Specication Note 7)
Sense inputs compensate for output voltage inaccuracy delivered at the load.
This is done by correcting voltage drops along the output wiring such as mod-
erate IR drops and the current carrying capacity of PC board etch. Sense inputs
also improve the stability of the converter and load system by optimizing the
control loop phase margin.
Note: The Sense input and power Vout lines are internally connected through
low value resistors to their respective polarities so that the converter can
operate without external connection to the Sense. Nevertheless, if the Sense
function is not used for remote regulation, the user should connect +Sense to
+Vout and –Sense to –Vout at the converter pins.
The remote Sense lines carry very little current. They are also capacitively
coupled to the output lines and therefore are in the feedback control loop to
regulate and stabilize the output. As such, they are not low impedance inputs
and must be treated with care in PC board layouts. Sense lines on the PCB
should run adjacent to DC signals, preferably Ground. In cables and discrete
wiring, use twisted pair, shielded tubing or similar techniques
Please observe Sense inputs tolerance to avoid improper operation:
[Vout(+) –Vout(-)] – [ Sense(+) – Sense(-)] ≤ 10% of Vout
Output overvoltage protection is monitored at the output voltage pin, not the
Sense pin. Therefore excessive voltage differences between Vout and Sense
together with trim adjustment of the output can cause the overvoltage protec-
tion circuit to activate and shut down the output.
Power derating of the converter is based on the combination of maximum
output current and the highest output voltage. Therefore the designer must
ensure:
(Vout at pins) x (Iout) ≤ (Max. rated output power)
Figure 8. Remote Sense Circuit Conguration
LOAD
Contact and PCB resistance
losses due to IR drops
Contact and PCB resistance
losses due to IR drops
+OUTPUT
+SENSE
TRIM
-SENSE
-OUTPUT
-INPUT
ON/OFF
CONTROL
+INPUT
Sense Current
I OUT
Sense Return
I OUT Return
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|---|---|
| HPQ-12-D48_11 | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Isolated 300-Watt Quarter Brick DC/DC Converters |
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| HPQ-3.3 | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Isolated High Power Quarter Brick DC/DC Converters |
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