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参数资料
| 型号： | SP6136ER1-L |
| 厂商： | Exar Corporation |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-QFN |
| 标准包装： | 490 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 680kHz |
| 占空比： | 92% |
| 电源电压： | 5 V ~ 24 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-VFQFN 裸露焊盘 |
| 包装： | 散装 |
| 其它名称： | 1016-1394 |
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 (Imax ? 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 W (232K W standard).
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. 11K
RS2
5. K
As an example: if desired I MAX is 7A, then
R S3 = 63.4K W .
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
63.4 K
CS
RS2
5. K
Figure 3- Over-current detection circuit
for I MAX < {60mV / DCR}
0. uF
Figure 2- Over-current detection circuit
for Imax > 60mV / DCR
Power MOSFET Selection
There are four main criterion in selecting
Power MOSFETs for buck conversion:
●
Voltage rating BV DSS
Decreasing the Current L imit
If it is required to set Imax < { 60mV / DCR } , a
resistor is added as shown in figure 3. RS3
●
●
●
On resistance R DS(ON)
Gate-to-drain charge Q GD
Package type
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 :
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 = 10A, f = 2000KHz, DCR =
4.5m W (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
Oct 3 -06 Rev L
SP6 36 Synchronous Buck Controller
8
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6136ER1-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 |
| SP6137 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input, 900KHz Synchronous PWM Controller |
| SP6137CU | 制造商:Exar Corporation 功能描述:SMPS Controller |
| SP6137CU/TR | 制造商:Exar Corporation 功能描述:SMPS Controller |
| SP6137CU-L | 功能描述:开关变换器、稳压器与控制器 Wide Input, 900KHz Synchronous RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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