参数资料
型号: NCP5425DBG
厂商: ON Semiconductor
文件页数: 11/22页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 20TSSOP
标准包装: 75
PWM 型: 电压模式
输出数: 2
频率 - 最大: 938kHz
占空比: 100%
电源电压: 4.75 V ~ 13.2 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 125°C
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
包装: 管件
NCP5425
Inductor Current Sensing
Examples of lossless current sensing across an output
inductor are shown in Figure 8. Lx is the output inductance
and Rx represents its equivalent series resistance. To
compensate the current sense signal, the values of R1 and C1
are chosen so that Lx/Rx = R1 x C1. With these values, the
Switch
Node
current sense signal will have the same wave shape as the
inductor current and the voltage signal on C1 will represent
the instantaneous value of inductor current. The voltage
across C1 can be used as though it were a sense resistor with
the same value as the inductor’s ESR, thus avoiding a sense
resistor ’s power loss.
Switch
Node
Lx
R1
Lx
R1
Rx
+
+ls
Rx
+
+ls
C1
Rx X I L
C1
R2
Rx*I L *R2
(R1 + R2)
?
?ls
_
+
?
?ls
_
+
DC
DC
Output
Switch
Node
(8A)
70 mV
Output
Switch
Node
(8B)
70 mV
Lx
R1
Lx
R1
Rx
+
+ls
Rx
+
+ls
C1
Rx X I L
C1
(Rx*I L ) + (E R3 )
?
?ls
_
+
? ?ls
_
+
DC
R3
DC
R3
Output
70 mV
Output
R4
70 mV
E R3 = (Vo*R3)/R3 + R4)
(8C)
(8D)
Figure 8. Inductor Current Sensing ? Circuit Configurations
http://onsemi.com
11
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