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LM5035 bảng dữ liệu(PDF) 20 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
tên linh kiện LM5035
Giải thích chi tiết về linh kiện  PWM Controller with Integrated Half-Bridge and SyncFET Drivers
PDF  28 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5035 bảng dữ liệu(HTML) 20 Page - National Semiconductor (TI)

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Applications Information (Continued)
the power converter as shown in Figure 10. When the UVLO
pin voltage falls below the 1.25V threshold, an internal 23 µA
current sink is enabled to lower the voltage at the UVLO pin,
thus providing threshold hysteresis. Resistance values for
R1 and R2 can be determined from the following equations.
where V
PWR is the desired turn-on voltage and VHYS is the
desired UVLO hysteresis at V
PWR.
For example, if the LM5035 is to be enabled when V
PWR
reaches 34V, and disabled when VPWR is decreased to
32V, R1 should be 87k
Ω, and R2 should be 3.54kΩ. The
voltage at the UVLO pin should not exceed 7V at any time.
Be sure to check both the power and voltage rating (0603
resistors can be rated as low as 50V) for the selected R1
resistor.
20177529
FIGURE 10. Basic UVLO Configuration
20177530
FIGURE 11. Basic Over-Voltage Protection
www.national.com
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