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TLV767-Q1 データシート(PDF) 20 Page - Texas Instruments

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部品番号 TLV767-Q1
部品情報  TLV767-Q1 1-A, 16-V Linear Voltage Regulator
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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TLV767-Q1 データシート(HTML) 20 Page - Texas Instruments

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TLV767
IN
EN
GND
FB
OUT
CIN
R1
R2
COUT
CFF
(opt.)
20
TLV767-Q1
SBVS381 – APRIL 2020
www.ti.com
Product Folder Links: TLV767-Q1
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Copyright © 2020, Texas Instruments Incorporated
8.2 Typical Application
This section discusses implementing this device for a typical application. Figure 39 shows the application circuit.
Figure 39. Typical Application Circuit
8.2.1 Design Requirements
Table 2 summarizes the design requirements for this application.
Table 2. Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
5 V
Output voltage
3.3 V
Output current
100 mA
8.2.2 Detailed Design Procedure
8.2.2.1 Transient Response
As with any regulator, increasing the size of the output capacitor reduces overshoot and undershoot magnitude.
If load transients are expected with ramp rates greater than 0.5 A/µs, use a 2.2-µF or larger output capacitor.
8.2.3 Choose Feedback Resistors
For this design example, VOUT is set to 3.3 V. The following equations set the feedback divider resistors for the
desired output voltage:
VOUT = VFB × (1 + R1 / R2)
(11)
R1 + R2 ≤ VOUT / (IFB × 100)
(12)
For improved output accuracy, use Equation 12 and IFB = 50 nA as listed in the Electrical Characteristics table of
the Specifications section to calculate the upper limit for series feedback resistance (R1 + R2 ≤ 660 kΩ).
The control-loop error amplifier drives the FB pin to the same voltage as the internal reference (VFB = 0.8 V, as
listed in the Electrical Characteristics table). Use Equation 11 to determine the ratio of R1 / R2 = 3.125. Use this
ratio and solve Equation 12 for R2. Now calculate the upper limit for R2 ≤ 160 kΩ. Select a standard value
resistor for R2 = 160 kΩ.
Reference Equation 11 and solve for R1:
R1 = (VOUT / VFB – 1) × R2
(13)
From Equation 13, R1 = 500 kΩ can be determined. Select a standard value resistor for R1 = 499 kΩ. VOUT =
3.3 V (as determined by Equation 11).


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