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PQ24150QGA07NRS 参数 Datasheet PDF下载

PQ24150QGA07NRS图片预览
型号: PQ24150QGA07NRS
PDF下载: 下载PDF文件 查看货源
内容描述: 100瓦,无需散热器,隔离式DC / DC转换器 [100 Watts, No Heatsink, Isolated DC/DC Converter]
分类和应用: 转换器
文件页数/大小: 13 页 / 673 K
品牌: SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
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Technical Specification  
Quarter  
24V 15V  
6.7A  
out  
in  
Brick  
the converter. Because the PowerQor converter is much  
lighter, vibration and shock-induced problems are greatly  
reduced. Moreover, due to the lack of failure-prone explicit  
thermal connections and the lack of potting material the  
PowerQor converter is more reliable than conventional  
dc/dc converters.  
BASIC OPERATION AND  
FEATURES  
The PowerQor series converter uses a two-stage power cir-  
cuit topology. The first stage is a buck-converter that keeps  
the output voltage constant over variations in line, load, and  
temperature. The second stage uses a transformer to provide  
the functions of input/output isolation and voltage step-  
down to achieve the low output voltage required.  
The PowerQor series converter uses the industry standard  
pin-out configuration used by other vendors of comparably  
sized and rated dc/dc converters. The unit is pin for pin  
compatible with the Lucent QW series.  
Both the first stage and the second stage switch at a fixed  
frequency for predictable EMI performance. Rectification of  
the transformer’s output is accomplished with synchronous  
rectifiers. These devices, which are MOSFETs with a very  
low on-state resistance, dissipate far less energy than  
Schottky diodes used in conventional dc/dc converters. This  
is the primary reason that the PowerQor converter has such  
high efficiency—even at very low output voltages and very  
high output currents.  
The PowerQor converter has many standard control and  
protection features. All shutdown features are non-latching,  
meaning that the converter shuts off for 200ms before  
restarting (see Figure F).  
• An ON/OFF input permits the user to control when the  
converter is on and off in order to properly sequence dif-  
ferent power supplies and to reduce power consumption  
during a standby condition.  
Dissipation throughout the converter is so low that the  
PowerQor converter requires no heatsink to deliver  
a greater level of power than can be delivered by a con-  
ventional, Schottky-diode-based dc/dc converter with a  
0.5” high heatsink. At equivalent ambient air temperature,  
airflow rate, and output power level, the hottest semicon-  
ductor junction temperature and the hottest PCB temperature  
within the PowerQor converter are cooler than those found  
in conventional dc/dc converters with a 0.5” high heatsink  
attached.  
Remote sense inputs permit the user to maintain an  
accurate voltage at the load despite distribution voltage  
drops between the converter’s output and the load.  
• An output voltage trim input permits the user to trim  
the output voltage up or down to achieve a custom volt-  
age level or to do voltage margining.  
• An input under-voltage lockout avoids input system  
instability problems while the input voltage is rising.  
Since a heatsink is not required, the PowerQor converter  
does not need a metal baseplate or potting material to help  
conduct the dissipated energy to the heatsink. The  
PowerQor converter can thus be built more simply using  
high yield surface mount techniques on a PCB substrate.  
The output current limit protects both the converter  
and the board on which it is mounted against a short cir-  
cuit condition. (see Figure 18)  
• An output over-voltage limit circuit shuts the unit  
down if the output voltage at the output pins gets too  
high.  
Unlike conventional dc/dc converters, which have critical  
thermal connections between the power components and the  
baseplate, and between the baseplate and the heatsink, the  
PowerQor converter has no explicit, failure-prone thermal  
connections.  
• A sensor located in a central spot of the PCB provides a  
PCB temperature limit. If, due to an abnormal con-  
dition, this spot gets too hot, the converter will turn off.  
Once the converter has cooled, it will automatically turn  
on again without the need to recycle the input power.  
Compared to a conventional Schottky-diode-based dc/dc  
converter with a 0.5” high heatsink, the PowerQor convert-  
er is more efficient and therefore it dissipates less than half  
the energy. Additionally, because the PowerQor converter is  
thinner (0.4” vs. 1.0”), the board-to-board pitch in a rack  
can be much smaller, and cooling airflow is less impeded by  
CONTROL PIN DESCRIPTIONS  
Pin 2 (ON/OFF): The ON/OFF input, Pin 2, permits the  
user to control when the converter is on or off. This input is  
Product # PQ24150QGA07  
Phone 1-888-567-9596  
Doc.# 005-2QG215D_A  
3/1/02  
Page 8