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ATL431LI_V02 Datasheet(Hoja de datos) 15 Page - Texas Instruments

No. de Pieza. ATL431LI_V02
Descripción  ATL431LI / ATL432LI High Bandwidth Low-Iq Programmable Shunt Regulator
Descarga  29 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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 15 page
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Time (s)
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0.001
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Vka(Rsup=10k:)
Vka(Rsup=1k:)
15
ATL431LI
ATL432LI
www.ti.com
SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019
Product Folder Links: ATL431LI ATL432LI
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Copyright © 2017–2019, Texas Instruments Incorporated
11.2.1.2.2
Output Voltage and Logic Input Level
In order for ATL431LI to properly be used as a comparator, the logic output must be readable by the receiving
logic device. This is accomplished by knowing the input high and low level threshold voltage levels, typically
denoted by VIH and VIL.
As seen in Figure 24, ATL431LI's output low level voltage in open-loop/comparator mode is approximately 2 V,
which is typically sufficient for 5V supplied logic. However, would not work for 3.3 V and 1.8 V supplied logic. To
accommodate this a resistive divider can be tied to the output to attenuate the output voltage to a voltage legible
to the receiving low voltage logic device.
ATL431's output high voltage is equal to VSUP due to ATL431LI being open-collector. If VSUP is much higher than
the receiving logic's maximum input voltage tolerance, the output must be attenuated to accommodate the
outgoing logic's reliability.
When using a resistive divider on the output, be sure to make the sum of the resistive divider (R1 and R2 in
Figure 23) is much greater than RSUP in order to not interfere with ATL431LI's ability to pull close to VSUP when
turning off.
11.2.1.2.2.1
Input Resistance
ATL431LI requires an input resistance in this application in order to source the reference current (IREF) needed
from this device to be in the proper operating regions while turning on. The actual voltage seen at the ref pin will
be VREF=VIN-IREF*RIN. Because IREF can be as high as 4 µA. TI recommends to use a resistance small enough
that will mitigate the error that IREF creates from VIN.
11.2.1.3 Application Curve
Figure 24. Output Response With Various Cathode Currents




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