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ATL431LI_V02 Datasheet(Hoja de datos) 20 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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 20 page
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2
REF
FB
REF
2
2
R
V
/ (I
I
)
R
2.5 V / (0.5mA
0.4 A)
R
5.004k
P
:
1
OUT
REF
FB
1
1
R
(V
V
) / I
R
(20 V
2.5 V) / 0.5mA
R
35k:
OUT
OPTNL
OPTNL
OPTNL
OPTNL
Rs
(V
V
2 V) / I
V
Optocoupler Voltage at No Load Conditions
I
Optocoupler Current at No Load Conditions
|
ATL431LI
R1
R2
Rs
Iq
IREF
Copyright © 2017, Texas Instruments Incorporated
VOUT
Iq
IKA
20
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
Figure 29. Feedback Quiescent Current
11.2.4.1.1.1
ATL431LI Biasing
Figure 29 shows the simplified version of the feedback network. The standby Iq of the system is dependent on
two paths, ATL431LI biasing path and the resistor feedback path. With the given design requirements the total
current through the feedback network cannot exceed 2mA.
The design goal is to take full advantage of the Imin to set the IKA of the ATL431LI. The benefit of the ATL431LI is
its low Imin of 80 µA which allows the IKA to be lower at a full load condition compared to typical TL431LI devices.
This helps lower the IKA at the no-load condition which is higher than the full load condition due to the dynamic
changes in the IKA as the system load varies. The IKA at no-load, IOPTNL, is dependent the value of Rs which is
the biasing resistor. Rs is very application specific and is dependent on variables such as optocoupler's CTR,
voltage, and current at no-load and this can be seen on Equation 2. By using an optocoupler with a high CTR it
is possible to lower IOPTNL to a value of 1.5 mA for a power loss of 30 mW.
(2)
11.2.4.1.1.2
Resistor Feedback Network
The feedback resistors set the output voltage of the secondary side and will consume the same Iq at a fixed
voltage. The design goal for the feedback resistor path is to minimize the resistor error while maintaining a low Iq.
For this system example the feedback network path in this design will consume 0.5 mA to allow enough current
for ATL431LI biasing. The resistors, R1 and R2, are sized based on a 0.5 mA budget for Iq and Iref. By using the
resistor values from Equation 3 and Equation 4 the total power consumption will be 10mW and this can be
further decreased by using larger resistors.
(3)
(4)




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