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LM5035 датащи(PDF) 21 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM5035
подробное описание детали  PWM Controller with Integrated Half-Bridge and SyncFET Drivers
PDF  28 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM5035 датащи(HTML) 21 Page - National Semiconductor (TI)

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Applications Information (Continued)
The impedance seen looking into the resistor divider from
the UVLO and OVP pins determines the hysteresis level.
UVLO and OVP enable and disable thresholds are calcu-
lated using the equations in the table below for the three-
resistor divider illustrated in Figure 12.
TABLE 1. UVO/OVP Divider Formulas
Outputs disabled due to VIN falling below UVLO threshold
Outputs enabled due to VIN rising above UVLO threshold
UVLO
on = UVLOoff + (23µA x R1)
Outputs disabled due to VIN rising above OVP threshold
Outputs enabled due to VIN falling below OVP threshold
OVP
on = OVPoff - [23µA x (R1 + R2)]
The typical operating ranges of undervoltage and overvolt-
age thresholds are calculated from the above equations. For
example, for resistor values R1 = 86.6k
Ω, R2 = 2.10kΩ and
R3 = 1.40k
Ω the computed thresholds are:
UVLO turn-off = 32.2V
UVLO turn-on = 34.2V
OVP turn-on = 78.4V
OVP turn-off = 80.5V
20177531
FIGURE 12. UVLO/OVP Divider
www.national.com
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