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LM4040CIM3-2.0 Datasheet(PDF) 37 Page - Texas Instruments

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Part No. LM4040CIM3-2.0
Description  LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM4040CIM3-2.0 Datasheet(HTML) 37 Page - Texas Instruments

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LM4040-N, LM4040-N-Q1
www.ti.com
SNOS633K – OCTOBER 2000 – REVISED JUNE 2016
Product Folder Links: LM4040-N LM4040-N-Q1
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Copyright © 2000–2016, Texas Instruments Incorporated
Typical Applications (continued)
9.2.3 Bounded Amplifier
Nominal clamping voltage is ±11.5 V (LM4040-N's reverse breakdown voltage +2 diode VF).
Figure 13. Bounded Amplifier Reduces Saturation-Induced Delays and
Can Prevent Succeeding Stage Damage
9.2.3.1 Design Requirements
Design an amplifier with output clamped at ±11.5 V.
9.2.3.2 Detailed Design Procedure
With amplifier rails of ±15 V, the output can be bound to ±11.5 V with the LM4040-10 and two nominal diode
voltage drops of 0.7 V.
VOUTBound = 2 × VFWD + VZ
(5)
VOUTBound = 1.4 V + 10 V
(6)
Select RS = 15 kΩ to keep IR low. Calculate IR to confirm RS selection.
IR = (VIN – VOUT) / R, however in this case, the negative supply must be taken into account.
(7)
IR = (VIN+ – VIN- – VOUT)/R = (30 V – 10 V) / (RS1+RS2) = 20 V / 30 kΩ = 0.667 mA
(8)
This is an acceptable value for IR that will not draw excessive current, but prevents the part from being starved
for current.


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