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参数资料
| 型号： | SP6133EB |
| 厂商： | Exar Corporation |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6133 |
| 标准包装： | 1 |
| 系列： | * |
APPLICATION INFORMATION
=
Increasing the Current L imit
If it is desired to set Imax > {60mV / DCR} (in
this case larger than 4.6A), then a resistor
R S3 should be added as shown in figure 2.
R S3 forms a resistor divider and reduces the
voltage seen by the comparator.
Since: 60mV I MAX ? DCR
R S3 {R S + R S2 + R S3 }
R S3 =
R S2 ? [ V OUT - 60mV + (I MAX ?DCR) ] ............(2)
60mV - (I MAX ? DCR)
As an example: for I MAX of 2A and V OUT of
3.3V, calculated R S3 is .5M Ω .
SP613X
Solving for RS3 we get:
SWN
L = 2.7uH, DCR = 4. mOhm
Vout
R S3 =
[60mV ?(R S + R S2 )]
[(Imax ? DCR) – 60mV]
..........( )
RS
5. K
RS2
5. K
As an example: if desired I MAX is 7A, then
R S3 = 63.4K Ω .
ISP
ISN
CSP
6.8nF
CS
0. uF
RS3
.5MOhm
SP613X
SWN
L = 2.7uH, DCR = 4. mOhm
Vout
ISP
ISN
CSP
6.8nF
RS
5. K
RS3
63.4K
RS2
5. K
Figure 3- Over-current detection circuit
for I MAX < {60mV / DCR}
Power MOSFET Selection
Voltage rating BV DSS
On resistance R DS ( ON )
Gate-to-drain charge Q GD
Package type
CS
0. uF
Figure 2- Over-current detection circuit
for Imax > 60mV / DCR
Decreasing the Current L imit
If it is required to set Imax < {60mV / DCR} , a
resistor is added as shown in figure 3. RS3
increases the net voltage detected by the
current-sense comparator. Voltage at the
positive and negative terminal of compara-
tor is given by:
VSP = V OUT + (I MAX ? DCR)
VSN = V OUT ? {R S3 / (R S2 +R S3 )}
Since the comparator is triggered at 60mV:
VSP-VSN = 60 mV
Combining the above equations and solv -
ing for R S3 :
There are four main criterion in selecting
Power MOSFETs for buck conversion:
●
●
●
●
In order to better illustrate the MOSFET se-
lection process, the following buck converter
design example will be used: V IN = 2V,
V OUT = 3.3V, I OUT = 0A, f = 300KHz, DCR
= 4.5m Ω (inductor DC resistance), efficiency
= 94% and T A = 40?C.
Select the voltage rating based on maximum
input voltage of the converter. A commonly
used practice is to specify BV DSS at least
twice the maximum converter input voltage.
This is done to safeguard against switching
transients that may break down the MOSFET.
For converters with V IN of less than 0V, a
20V rated MOSFET is sufficient. For convert -
Oct 24-06 Rev L
SP6 33 Synchronous Buck Controller
8
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6133ER1 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6133ER1/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Synchronous Buck Controller |
| SP6133ER1-L | 功能描述:DC/DC 开关控制器 Synchronous Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6133ER1-L/TR | 功能描述:DC/DC 开关控制器 Synchronous Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP6134 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Dual Supply Synchronous Buck Controller |
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