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MIC4127YML 参数 Datasheet PDF下载

MIC4127YML图片预览
型号: MIC4127YML
PDF下载: 下载PDF文件 查看货源
内容描述: 在先进封装的双1.5A峰值低侧MOSFET驱动器 [Dual 1.5A-Peak Low-Side MOSFET Drivers in Advanced Packaging]
分类和应用: 驱动器
文件页数/大小: 8 页 / 534 K
品牌: MIC [ MIC GROUP RECTIFIERS ]
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Micrel  
MIC4126/27/28  
for total power dissipation is the sum of the dissipation  
caused by the load and the transition power dissipation (PL  
Application Information  
+ PT).  
Supply Bypassing  
Large currents are required to charge and discharge large  
capacitive loads quickly. For example, changing a 1000pF  
load by 16V in 25ns requires 0.8A from the supply input.  
Load Dissipation  
Power dissipation caused by continuous load current  
(when driving a resistive load) through the driver’s output  
resistance is:  
To guarantee low supply impedance over a wide frequency  
range, parallel capacitors are recommended for power  
supply bypassing. Low-inductance ceramic MLC capacitors  
with short lead lengths (< 0.5") should be used. A 1.0µF  
film capacitor in parallel with one or two 0.1µF ceramic  
MLC capacitors normally provides adequate bypassing.  
PL = IL2 RO  
For capacitive loads, the dissipation in the driver is:  
2
PL = f CL VS  
Grounding  
Transition Dissipation  
When using the inverting drivers in the MIC4126 or  
MIC4128, individual ground returns for the input and output  
circuits or a ground plane are recommended for optimum  
switching speed. The voltage drop that occurs between the  
driver’s ground and the input signal ground, during normal  
high-current switching, will behave as negative feedback  
and degrade switching speed.  
In applications switching at a high frequency, transition  
power dissipation can be significant. This occurs during  
switching transitions when the P-channel and N-channel  
output FETs are both conducting for the brief moment  
when one is turning on and the other is turning off.  
PT = 2 f VS Q  
Charge (Q) is read from the following graph:  
The E-pad and MLF packages have an exposed pad under  
the package. It’s important for good thermal performance  
that this pad is connected to a ground plane.  
Control Input  
Unused driver inputs must be connected to logic high  
(which can be VS) or ground. For the lowest quiescent  
current (< 500µA), connect unused inputs-to-ground. A  
logic-high signal will cause the driver to draw up to 9mA.  
The control input voltage threshold is approximately 1.5V.  
The control input recognizes 1.5V up to VS as a logic high  
and draws less than 1µA within this range.  
Power Dissipation  
Power dissipation should be calculated to make sure that  
the driver is not operated beyond its thermal ratings.  
Quiescent power dissipation is negligible. A practical value  
Crossover Energy Loss per Transition  
M9999-072605  
(408) 955-1690  
July 2005  
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