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QSW025A0B741-HZ 参数 Datasheet PDF下载

QSW025A0B741-HZ图片预览
型号: QSW025A0B741-HZ
PDF下载: 下载PDF文件 查看货源
内容描述: 36 - 75VDC输入; 12VDC输出; 25A输出电流 [36 - 75Vdc Input; 12Vdc Output; 25A Output Current]
分类和应用:
文件页数/大小: 16 页 / 411 K
品牌: LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
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Data Sheet  
February 16, 2009  
QSW025A0B Series Power Modules; DC-DC Converters  
36 – 75Vdc Input; 12Vdc Output; 25A Output Current  
Output Overvoltage Clamp  
Feature Descriptions  
The output overvoltage clamp consists of a control  
circuit, independent of the primary regulation loop, that  
Overcurrent Protection  
To provide protection in a fault output overload condition,  
the module is equipped with internal current-limiting  
circuitry and can endure current limiting for a few mili-  
seconds. If the overcurrent condition persists beyond a  
few milliseconds, the module will shut down and remain  
latched off. The overcurrent latch is reset by either  
cycling the input power or by toggling the on/off pin for  
one second. If the output overload condition still exists  
when the module restarts, it will shut down again. This  
operation will continue indefinitely until the overcurrent  
condition is corrected.  
monitors the voltage on the output terminals and clamps  
the voltage when it exceeds the overvoltage set point.  
The control loop of the clamp has a higher voltage set  
point than the primary loop. This provides a redundant  
voltage control that reduces the risk of output  
overvoltage.  
Overtemperature Protection  
These modules feature an overtemperature protection  
circuit to safeguard against thermal damage. The circuit  
shuts down and latches off the module when the  
maximum device reference temperature is exceeded.  
The module can be restarted by cycling the dc input  
power for at least one second or by toggling the remote  
on/off signal for at least one second.  
An auto-restart option is also available. An auto-restart  
feature continually attempts to restore the operation until  
fault condition is cleared.  
Remote On/Off  
Input Under/Over voltage Lockout  
Two remote on/off options are available. Positive logic  
remote on/off turns the module on during a logic-high  
voltage on the ON/OFF pin, and off during a logic low.  
Negative logic remote on/off turns the module off during  
a logic high and on during a logic low. Negative logic,  
device code suffix "1," is the factory-preferred  
At input voltages above or below the input under/over  
voltage lockout limits, module operation is disabled. The  
module will begin to operate when the input voltage level  
changes to within the under and overvoltage lockout  
limits.  
configuration. The on/off circuit is powered from an  
internal bias supply. To turn the power module on and  
off, the user must supply a switch to control the voltage  
between the on/off terminal and the Vi (-) terminal  
(Von/off). The switch can be an open collector or  
equivalent (see Figure 12). A logic low is Von/off = -0.3V  
to 0.8V. The typical Ion/off during a logic low is 10 µA.  
The switch should maintain a logic-low voltage while  
sinking 10µA. During a logic high, the maximum Von/off  
generated by the power module is 3.5V. The maximum  
allowable leakage current of the switch at Von/off = 2.0V  
is 4µA. If using an external voltage source, the maximum  
voltage V on/off on the pin is 13.5V with respect to the  
Vi (-) terminal.  
Active Load Sharing (Parallel Operation with  
–P option)  
For additional power requirements, the power module  
can be configured for parallel operation with active load  
sharing. Good layout techniques should be observed  
for noise immunity when using multiple units in parallel.  
To implement active load sharing, the following  
requirements should be followed:  
The share pins of all units in parallel must be  
connected together. The path of these connections  
should be as direct as possible. Vin(-) is the return  
for the active share signal for each module;  
If not using the remote on/off feature, perform one of the  
following to turn the unit on:  
therefore, all modules in parallel must use the same  
Vin source. The share signal trace should be placed  
as close to the Vin(-) power plane as possible.  
For negative logic, short ON/OFF pin to VI(-).  
For positive logic: leave ON/OFF pin open.  
These modules contain circuitry to block reverse  
current flow upon start-up, when output voltage is  
present from other parallel modules, eliminating the  
requirement for external output ORing devices.  
However, output ORing devices should be used, if  
fault tolerance is desired in parallel applications.  
Ion/off  
ON/OFF  
+
on/off  
V
When using modules in parallel without output  
ORing devices, the On/Off signal for one module  
shall be 40mS ahead of the other modules, to allow  
output voltage to be established, before the  
remaining modules startup. If using output ORing  
devices, the 40mS delay is not required.  
VO(+)  
LOAD  
O
V (–)  
I
V (+)  
VI(–)  
When not using the parallel feature, leave the share  
pin open.  
Figure 12. Remote On/Off Implementation.  
8
LINEAGE POWER