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MP1530DQ-LF 参数 Datasheet PDF下载

MP1530DQ-LF图片预览
型号: MP1530DQ-LF
PDF下载: 下载PDF文件 查看货源
内容描述: [Switching Regulator, Current-mode, 3.6A, 1400kHz Switching Freq-Max, 3 X 3 MM, ROHS COMPLIANT, MO-220VEED-4, QFN-16]
分类和应用: 开关
文件页数/大小: 16 页 / 298 K
品牌: MPS [ MONOLITHIC POWER SYSTEMS ]
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MP1530 – TRIPLE OUTPUT STEP-UP PLUS LINEAR REGULATORS FOR TFT BIAS  
APPLICATION INFORMATION  
saturate under the worst-case load transient  
and startup conditions.  
COMPONENT SELECTION  
Setting the Output Voltages  
Set the output voltage on each output by  
selecting the resistive voltage divider ratio. The  
voltage divider drops the output voltage to the  
feedback threshold voltage. Use 10kto 50kΩ  
for the low-side resistor RL of the voltage  
divider.  
Calculate the required inductance value by the  
equation:  
VIN (VOUT - VIN )  
L   
VOUT fSW  I  
VOUT ILOAD  
(MAX)  
IIN(MAX)  
For the step-up converter, determine the high-  
side resistor RH by the equation:  
VIN   
30% 50% IIN(MAX)  
I   
VMAIN VFB1  
RH  
V
Where ILOAD(MAX) is the maximum load current, ΔI  
is the peak-to-peak inductor ripple current, and η  
is efficiency.  
FB1   
RL  
Where VMAIN is the output voltage of the step-up  
converter.  
Selecting the Input Capacitor  
For the positive charge-pump, determine the  
high-side resistor RH by the equation:  
An input capacitor is required to supply the AC  
ripple current to the inductor, while limiting  
noise at the input source. A low ESR capacitor  
is required to keep the noise at the IC to a  
minimum. Since it absorbs the input switching  
current it requires an adequate ripple current  
rating. Use a capacitor with RMS current rating  
greater than the inductor ripple current (see  
selecting the Inductor to determine the inductor  
ripple current). One 10μF ceramic capacitor is  
used in the application circuit of Figure 3  
because of the high source impedance seen in  
typical lab setups. Actual applications usually  
have much lower source impedance since the  
step-up converter typically runs directly from the  
output of another regulated supply. Typically,  
the input capacitance can be reduced below the  
value used in the typical application circuit.  
VGH VFB3  
RH  
VFB3  
RL  
For the negative charge-pump, determine the  
high-side resistor RH by the equation:  
VGL  
RH  
VREF  
RL  
Selecting the Inductor  
The inductor is required to force the higher  
output voltage while being driven by the input  
voltage. A larger value inductor results in less  
ripple current that results in lower peak inductor  
current, reducing stress on the internal  
N-Channel.switch. However, the larger value  
inductor has a larger physical size, higher  
series resistance, and/or lower saturation  
current.  
To insure stable operation place the input  
capacitor as close to the IC as possible.  
Alternately a smaller high quality 0.1μF ceramic  
capacitor may be placed closer to the IC if the  
larger capacitor is placed further away.  
A 4.7µH inductor is recommended for most  
applications. A good rule of thumb is to allow  
the peak-to-peak ripple current to be  
approximately 30-50% of the maximum input  
current. Make sure that the peak inductor  
current is below 75% of the current limit to  
prevent loss of regulation due to the current  
limit. Also make sure that the inductor does not  
MP1530 Rev. 1.41  
5/25/2011  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2011 MPS. All Rights Reserved.  
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