参数资料
型号: SI8505-B-IM
厂商: Silicon Laboratories Inc
文件页数: 22/36页
文件大小: 0K
描述: SENSOR CURR 10A 5.5V UNI 12QFN
标准包装: 74
电流 - 感应: 10A
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: 336-1417-5
Si85xx
3.5. Full-Bridge Converter Example
The full-bridge circuit of Figure 19 uses an Si851x configured in 4-Wire Ping-Pong output mode. The switching
frequency of this phase-shifted full-bridge is 150 kHz, and the maximum control phase overlap is 70%.
VIN
VDD
VDD
MODE
IIN
OUT1
OUT2
OUT1
OUT2
PH1
C1
0.1 μF
C2
1 μF
GND
Si851x
VDD
TRST
PH2
R1
R2
R3 R4
IOUT
PH3
PH4
PH1
PH2
Q1
Q2
Switches Turned ON
Si85xx State
1–4
MEASURE
1–2
RESET
2–3
MEASURE
3–4
RESET
TI
OUT1
PH3
Q3
PH4
Q4
OUT2
Figure 19. Full-Bridge Converter
Given the 150 kHz switching frequency (duty cycle fixed at 50%), the equivalent period is 1/150 x 10 3 = 6.6 μs. At
70% maximum overlap, this equates to a worst-case t R value of 0.3 x 6.6 x 10 –6 = 1.98 μs. The default value for t R
can, therefore, be used and is selected by connecting TRST to VDD. As shown in the timing diagram of Figure 19,
integrator reset occurs when current circulates between Q1 and Q2 and between Q3 and Q4 (i.e. when current is
not being sourced from VIN). The external driver delay ensures reset is complete prior to the start of measurement.
22
Preliminary Rev. 0.4
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