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L6206 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện L6206
Giải thích chi tiết về linh kiện  APPLICATION NOTE
PDF  53 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L6206 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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AN1762 APPLICATION NOTE
22/53
Figure 22. Output Current Detection Threshold versus RCL Value (L6206 ONLY)
The Over Current Detection threshold can also be adjusted through an external reference voltage, as shown in
Figure 23. The external reference voltage source should be able to sink current (about 300 µA maximum). More-
over, if supply voltage is provided to the L6206 before VEXT, and its EN pins are at a high logic level, the device
starts working with minimum OCD threshold (actually the capacitor placed at the bottom of RCL allows a short
start-up time with higher OCD threshold). VEXT can also be obtained through a PWM output of a µC, adding a
series resistor to obtain a low-pass filter.
The OCD threshold (ISOVER) follows the equation:
ISOVER =
±10%,
at -25 °C < Tj < 125 °C
if 0.5 A < ISOVER < 4.5 A
Figure 23. Adjusting the OCD Threshold through an external reference voltage (L6206 ONLY)
5k
10k
15k
20k
25k
30k
35k
40k
0
0.5
1
1.5
2
2.5
3
3.5
5
R
CL [Ω ]
4
4.5
I
SO VER
[A]
18416.7 1.2V
Ve xt
–
()
R
CL
-----------------------------------------------------------
RCL
PROGCLA
L6206
Vext = 0 ÷ 1.2 V



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