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HIP6016CB 参数 Datasheet PDF下载

HIP6016CB图片预览
型号: HIP6016CB
PDF下载: 下载PDF文件 查看货源
内容描述: 先进的PWM和力量线性双控制 [Advanced PWM and Dual Linear Power Control]
分类和应用: 开关光电二极管
文件页数/大小: 14 页 / 134 K
品牌: INTERSIL [ Intersil ]
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HIP6016  
could cancel the usefulness of these low inductance  
components. Consult with the manufacturer of the load on  
specific decoupling requirements.  
Output Inductor Selection  
The PWM converter requires an output inductor. The output  
inductor is selected to meet the output voltage ripple  
requirements and sets the converter’s response time to a  
load ntransient. The inductor value determines the  
converter’s ripple current and the ripple voltage is a function  
of the ripple current. The ripple voltage and current are  
approximated by the following equations:  
Use only specialized low-ESR capacitors intended for  
switching regulator applications for the bulk capacitors. The  
bulk capacitor’s ESR determines the output ripple voltage  
and the initial voltage drop after a high slew-rate transient.  
An aluminum electrolytic capacitor’s ESR value is related to  
the case size with lower ESR available in larger case sizes.  
However, the equivalent series inductance of these  
capacitors increases with case size and can reduce the  
usefulness of the capacitor to high slew-rate transient  
loading. Unfortunately, ESL is not a specified parameter.  
Work with your capacitor supplier and measure the  
capacitor’s impedance with frequency to select suitable  
components. In most cases, multiple electrolytic capacitors  
of small case size perform better than a single large case  
capacitor. For a given transient load magnitude, the output  
voltage transient response due to the output capacitor  
characteristics can be approximated by the following  
equation:  
V
V  
V
IN  
--------------------------------- -----------------  
× L  
OUT  
OUT  
I =  
×
V  
= I × ESR  
OUT  
F
V
S
O
IN  
Increasing the value of inductance reduces the ripple current  
and voltage. However, the large inductance values reduce  
the converter’s response time to a load transient.  
One of the parameters limiting the converter’s response to a  
load transient is the time required to change the inductor  
current. Given a sufficiently fast control loop design, the  
HIP6016 will provide either 0% or 100% duty cycle in  
response to a load transient. The response time is the time  
interval required to slew the inductor current from an initial  
current value to the post-transient current level. During this  
interval the difference between the inductor current and the  
transient current level must be supplied by the output  
capacitors. Minimizing the response time can minimize the  
output capacitance required.  
dI  
TRAN  
dt  
V
= ESL ×  
+ ESR × I  
----------------------  
TRAN  
TRAN  
Linear Output Capacitors  
The output capacitors for the linear regulator and the linear  
controller provide dynamic load current. The linear controller  
uses dominant pole compensation integrated in the error  
amplifier and is insensitive to output capacitor selection.  
The response time to a transient is different for the  
application of load and the removal of load. The following  
equations give the approximate response time interval for  
application and removal of a transient load:  
Capacitor, C  
regulation.  
should be selected for transient load  
OUT3  
L
× I  
L
× I  
O
TRAN  
O
TRAN  
t
= ---------------------------------  
t
= ---------------------------------  
RISE  
FALL  
V
V  
V
The output capacitor for the linear regulator provides loop  
stability. The linear regulator (OUT2) requires an output  
capacitor characteristic shown in Figure 13. The upper line  
plots the 45 phase margin with 150mA load and the lower  
line is the 45 phase margin limit with a 10mA load. Select a  
IN  
OUT  
OUT  
where: I  
TRAN  
is the transient load current step, t is the  
RISE  
response time to the application of load, and t  
is the  
FALL  
response time to the removal of load. With a 5V input  
source, the worst case response time can be either at the  
application or removal of load, and dependent upon the  
output voltage setting. Be sure to check both of these  
equations at the minimum and maximum output levels for the  
worst case response time.  
C
capacitor with characteristic between the two limits.  
OUT2  
0.7  
0.6  
0.5  
0.4  
0.3  
0.2  
0.1  
Input Capacitor Selection  
The important parameters for the bulk input capacitor are the  
voltage rating and the RMS current rating. For reliable  
operation, select the bulk capacitor with voltage and current  
ratings above the maximum input voltage and largest RMS  
current required by the circuit. The capacitor voltage rating  
should be at least 1.25 times greater than the maximum input  
voltage and a voltage rating of 1.5 times is a conservative  
guideline.  
ESR ()  
10  
100  
1000  
CAPACITANCE (µF)  
Use a mix of input bypass capacitors to control the voltage  
overshoot across the MOSFETs. Use ceramic capacitance  
for the high frequency decoupling and bulk capacitors to  
supply the RMS current. Small ceramic capacitors should be  
FIGURE 13. C  
OUTPUT CAPACITOR  
OUT2  
2-207