参数资料
型号: OPENLPPOL-EVB
厂商: Silicon Laboratories Inc
文件页数: 21/36页
文件大小: 0K
描述: BOARD EVAL OPEN-LOOP POL
标准包装: 1
主要目的: 电源管理,电流感应
嵌入式:
已用 IC / 零件: Si8410,Si8512,Si8540
主要属性: 单相 POL,100 ~ 500 kHz 切换频率
次要属性: 20 ~ 80% 可变占空比
已供物品:
产品目录页面: 628 (CN2011-ZH PDF)
其它名称: 336-1919
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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