参数资料
型号: SI8506-B-IM
厂商: Silicon Laboratories Inc
文件页数: 21/36页
文件大小: 0K
描述: SENSOR CURR 20A 5.5V UNI 12QFN
标准包装: 74
电流 - 感应: 20A
精确度: ±5%
电流 - 电源: 4mA
传感器类型: 闭环
电源电压: 2.7 V ~ 5.5 V
输出: 可配置
频率: 50kHz ~ 1MHz
电极标记: 单向
工作温度: -40°C ~ 125°C
封装/外壳: 12-VFQFN
包装: 管件
其它名称: 336-1418-5
Si85xx
3.4. Single-Phase Buck Converter Example
In this example, the Si850x is configured to operate in a single-phase synchronous buck converter (Figure 18).
This converter has a PWM frequency of 1 MHz and a maximum duty cycle of 80%.
This is an example of a half-wave application that can be addressed with Single-Ended output mode. The PWM
period is calculated to be 1/10 –6 = 1.0 μs, and the worst-case value, t R , is 0.2 x 1.0 x 10 –6 = 200 ns at 80%
maximum duty cycle (R TRST = 20 k ? ).
In this example, the current measurement is made when the buck switch is on; so, PH2 is chosen as the reset
signal by connecting PH2 to R1 and grounding R2. The PH2 signal can be obtained at the input of the driver
external to the PWM controller or the output of the controller's internal driver (through a resistor divider if the driver
output swings beyond the device VDD range).
VDD
VIN
C1
C2
0.1 μF
1 μF
VDD1 VDD2
IIN
GND1
R2
GND2
R TRST
TRST
Si850x
GND3
R1
IOUT
OUT
2 Vpp
Q1
PH1
L1
VOUT
PH2
Current
PWM
I=0
I>0
C3
PH2
Q2
Si850x State
RESET
100 ns
MEASURE
Figure 18. Si850x Single-Phase Buck Converter
Preliminary Rev. 0.4
21
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