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SI-8050JD 参数 Datasheet PDF下载

SI-8050JD图片预览
型号: SI-8050JD
PDF下载: 下载PDF文件 查看货源
内容描述: 降压至5.0 V , 1.5 A , DC / DC转换器 [Step-Down to 5.0 V, 1.5 A, DC/DC Converter]
分类和应用: 转换器稳压器开关式稳压器或控制器电源电路开关式控制器输入元件
文件页数/大小: 10 页 / 538 K
品牌: ALLEGRO [ ALLEGRO MICROSYSTEMS ]
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SI-8050JD  
Step-Down  
to 5.0 V, 1.5 A,  
DC/DC Converter  
APPLICATIONS INFORMATION  
Input Capacitor (C1). Capacitors with low impedance  
for high-frequency ripple current must be used.  
Soft-Start Capacitor (C3). Soft start for the converter  
is enabled by connecting a capacitor between terminal 5  
and ground. The converter may be turned off by decreasing  
the terminal 5 voltage below 0.5 V with either an npn  
small-signal transistor or the output of open-collector TTL.  
If both a large soft-start capacitor and on/off control are  
desired, collector current limiting must be used to prevent  
transistor damage. No external voltage can be applied to  
terminal 5.  
Output Capacitor (C2). Capacitors with low impedance  
for high-frequency ripple current must be used. Especially  
when the C2 impedance is high, the switching waveform  
may not be normal at low temperatures. Film or tantalum  
capacitor for C2 may cause abnormal oscillations.  
Catch Diode (D1). Diode D1 must be a Schottky diode.  
Other diode types will result in increased forward voltage  
spikes, reverse current flow, increased IC power dissipa-  
tion during the off period, and possible destruction of the  
IC.  
Choke Coil (L1). If the winding resistance of the choke  
coil is too high, the circuit efficiency will decrease. As the  
overcurrent protection start current is approximately 2.5 A,  
attention must be paid to the heating of the coil by magnetic  
saturation due to overload. To reduce the output ripple, the  
inductor may be increased at the expense of excessive  
board area and cost.  
Parallel Operation. Parallel operation to increase load  
current is not permitted.  
Overcurrent Protection. The SI-8000JD series has a  
built-in fold-back type overcurrent protection circuit, which  
limits the output current at a start-up mode. It thus cannot  
be used in applications that require current at the start-up  
mode such as:  
(1) constant-current load,  
(2) power supply with positive and negative outputs to  
common load (a center-tap type power supply), or  
(3) raising the output voltage by putting a diode or a  
resistor between the device ground and system ground.  
SI-8050JD  
Typical Application  
www.allegromicro.com  
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