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TL750M08CKTPRG3 데이터시트(PDF) 6 Page - Texas Instruments

부품명 TL750M08CKTPRG3
상세설명  LOW-DROPOUT VOLTAGE REGULATORS
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PARAMETER MEASUREMENT INFORMATION
Applied Load
Current
Load
Voltage
∆VL
∆IL
∆VL = ∆IL × ESR
0
1
2
3
4
5
4.5
3.5
2.5
1.5
0.5
0
0.01
0.015
0.02
0.025
0.03
0.035
0.04
200
µF
1000
µF
1/ESR
0.005
400
µF
Not Recommended
Recommended Min ESR
Potential Instability
Region of
Best Stability
100
µF
22
µF
10
µF
Max ESR Boundary
Region of Best Stability
Min ESR
Boundary
3
2.8
2.6
2.4
2.2
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0.1
0
0.2
0.3
0.4
0.5
IL − Load Current Range − A
This Region Not
Recommended for
Operation
CL = 10 µF
CI = 0.1 µF
f = 120 Hz
Potential Instability Region
TL750M SERIES, TL751M SERIES
LOW-DROPOUT VOLTAGE REGULATORS
SLVS021K – JANUARY 1988 – REVISED OCTOBER 2006
The TL750Mxx is a low-dropout regulator. This means that the capacitance loading 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. Figure 1 and Figure 2 can establish the capacitance value and ESR range for the best regulator
performance.
Figure 1 shows the recommended range of ESR for a given load with a 10-
µF capacitor on the output. This
figure also 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 because it is the worst case.
Figure 2 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. This figure establishes the amount that the
minimum ESR limit shown in Figure 1 can be adjusted for different capacitor values.
For example, where the minimum load needed is 200 mA, Figure 1 suggests an ESR range of 0.8
Ω to 2 Ω for
10
µF. Figure 2 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 allows an ESR
range of 0.13
Ω to 2 Ω , achieving an expanded ESR range by using a larger capacitor at the output. For better
stability in low-current applications, a small resistance placed in series with the capacitor (see Table 1) is
recommended, so that ESRs better approximate those shown in Figure 1 and Figure 2.
Table 1. Compensation for Increased Stability at Low Currents
ESR
PART
ADDITIONAL
MANUFACTURER
CAPACITANCE
TYP
NUMBER
RESISTANCE
<br/>
AVX
15
µF
0.9
TAJB156M010S
1
<br/>
<br/>
KEMET
33
µF
0.6
T491D336M010AS
0.5
<br/>
OUTPUT CAPACITOR
<br/>
EQUIVALENT SERIES RESISTANCE (ESR)
STABILITY
vs
vs
LOAD CURRENT RANGE
EQUIVALENT SERIES RESISTANCE (ESR)
Figure 1.
Figure 2.
6
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