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ATL431LI датащит (PDF) 18 Page - Texas Instruments

№ деталь ATL431LI
подробность  ATL431LI / ATL432LI High Bandwidth Low-Iq Programmable Shunt Regulator
скачать  29 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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ATL431LI Datasheet(HTML) 18 Page - Texas Instruments

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Time (s)
-5E-6
-3E-6
-1E-6
1E-6
3E-6
5E-6
-6
-3
0
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15
18
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27
D001
Vsup
Vka=Vref
R1=10k: & R2=10k:
R1=38k: & R2=10k:
18
ATL431LI
ATL432LI
SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019
www.ti.com
Product Folder Links: ATL431LI ATL432LI
Submit Documentation Feedback
Copyright © 2017–2019, Texas Instruments Incorporated
11.2.3.2.2
Total Accuracy
When programming the output above unity gain (VKA=VREF), ATL431LI is susceptible to other errors that may
effect the overall accuracy beyond VREF. These errors include:
R1 and R2 accuracies
VI(dev) - Change in reference voltage over temperature
ΔVREF / ΔVKA - Change in reference voltage to the change in cathode voltage
|zKA| - Dynamic impedance, causing a change in cathode voltage with cathode current
Worst case cathode voltage can be determined taking all of the variables in to account. Application note Setting
the Shunt Voltage on an Adjustable Shunt Regulator, SLVA445 assists designers in setting the shunt voltage to
achieve optimum accuracy for this device.
11.2.3.2.3
Stability
Though ATL431LI is stable with no capacitive load, the device that receives the shunt regulator's output voltage
could present a capacitive load that is within the ATL431LI region of stability, shown in Figure 13. Also, designers
may use capacitive loads to improve the transient response or for power supply decoupling. When using
additional capacitance between Cathode and Anode, see Figure 13. Also, application note Understanding
Stability Boundary Conditions Charts in TL431, TL432 Data Sheet, SLVA482 will provide a deeper understanding
of this devices stability characteristics and aid the user in making the right choices when choosing a load
capacitor.
11.2.3.2.4
Start-Up Time
As shown in Figure 27, ATL431LI has a fast response up to approximately 2 V and then slowly charges to its
programmed value. This is due to the compensation capacitance (shown in Figure 13) the ATL43xLIx has to
meet its stability criteria. Despite the secondary delay, ATL43xLIx still has a fast response suitable for many
clamp applications.
11.2.3.3 Application Curve
Figure 27. ATL43xLIx Start-Up Response


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