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TL75LP48 数据表(PDF) 10 Page - Texas Instruments

部件名 TL75LP48
功能描述  LOW-DROPOUT VOLTAGE REGULATORS
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

TL75LP48 数据表(HTML) 10 Page - Texas Instruments

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TL75LPxxQ SERIES
TL75LPxxY SERIES
LOW DROPOUT VOLTAGE REGULATORS
SLVS073A − SEPTEMBER 1992 − REVISED AUGUST 1995
3−10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
PARAMETER MEASUREMENT INFORMATION
The TL75LPxx series are low-dropout voltage regulators. This means that the capacitance is important to the
performance of the regulator because it is a vital part of the control loop. The capacitor value and the equivalent series
resistance (ESR) both affect the control loop and must be defined for the load range and the temperature range.
Figures 3 and 4 can establish the capacitance value and ESR range for optimum regulator performance.
Figure 3 shows the recommended range of ESR, measured at 120 Hz, for a given load with a 10-
µF capacitor on the
output. In addition, it shows a maximum ESR limit of 2
Ω and a load-dependent minimum ESR limit.
For applications with varying loads, the lightest load condition should be chosen since it is the worst case. Figure 4
shows the relationship of the reciprocal of ESR to the square root of the capacitance with a minimum capacitance
limit of 10
µF and a maximum ESR limit of 2 Ω. Figure 4 establishes the amount that the minimum ESR limit of Figure
3 can be adjusted for different capacitor values. For example, when the minimum load needed is 200 mA,
Figure 3 suggests an ESR range of 0.8
Ω to 2 Ω for 10 µF. Figure 4 shows that changing the capacitor from
10
µF to 400 µF can change the ESR minimum by greater than 3/0.5 (or 6). Therefore, the new minimum ESR value
is 0.8/6 (or 0.13
Ω). This now allows an ESR range of 0.13 Ω to 2 Ω. This expanded ESR range is achieved by using
a larger capacitor at the output. For better stability in low-current applications, it is recommended that a small
resistance be placed in series with the capacitor (see Table 1) so that the ESR better approximates those in
Figures 3 and 4.
Table 1. Compensations for Increased Stability at Low Currents
MANUFACTURER
CAPACITANCE
ESR
PART
ADDITIONAL
MANUFACTURER
CAPACITANCE
ESR
TYP
PART
NUMBER
ADDITIONAL
RESISTANCE
AVX
15
µF
0.9
TAJB156M010S
1
KEMET
33
µF
0.6
T491D336M010AS
0.5
0.02
0.015
0.005
0
0
0.5
1
1.5
2
2.5
3
0.025
0.035
1/ESR
3.5
4
4.5
5
0.01
0.03
2.4
2.2
2
1.8
0
0.1
0.2
0.3
2.6
2.8
3
0.4
0.5
0.04
1.2
0.8
0.6
1.4
1.6
0.4
0.2
0
OUTPUT CAPACITOR
EQUIVALENT SERIES RESISTANCE
vs
LOAD CURRENT
OUTPUT CAPACITOR
STABILITY
vs
EQUIVALENT SERIES RESISTANCE
1
This Region Not
Recommended
for Operation
CL = 10 µF
CI = 0.1 µF
Max ESR Boundary
Min ESR
Boundary
Region of Best Stability
Potential Instability Region
IL − Load Current − A
10
µF
22
µF
100
µF
200
µF
400
µF
Region of
Best Stability
1000
µF
Not Recommended
Potential Instability
Recommended Min ESR
10
µF
Figure 3
Figure 4
Applied
Load
Current
Load
Voltage
∆IL
∆VL
∆VL = ∆IL × ESR


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