TL2217-285 Datasheet, PDF (4/6 Pages) Texas Instruments – FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION

TL2217-285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS066F – NOVEMBER 1991 – REVISED JULY 1999
COMPENSATION-CAPACITOR SELECTION INFORMATION
The TL2217-285 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 3 and
Figure 4 can be used to establish the capacitance value and ESR range for best regulator performance.
ESR (OUTPUT CAPACITOR)
vs
LOAD CURRENT
3
2.8 ^{CL = 22 µF}
2.6
CI = 0.1 µF
TJ = 25°C
2.4
ÇÇNot Recommended
Potential Instability
2.2
2
1.8
Max ESR Boundary
1001100^{ÇÇÇÇÇÇÇ}.......102864642 ^{ÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇ}_MB^{ÇÇÇÇÇÇÇ}_oinun^{ÇÇÇÇÇÇÇ}_EdSaRr^{ÇÇÇÇÇÇÇ}_y ^{ÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇÇ}
0
0.1
0.2
0.3
0.4
0.5
IL – Load Current – A
∆ IL
Applied Load
Current
STABILITY
vs
ESR
0.04
0.035
0.03
0.025
0.02
0.015
0.01
0.005
0
ÇÇÇÇÇÇÇÇÇÇÇÇ₁₁₀₀ÇÇÇÇÇÇÇÇÇÇÇÇ_{0BµµFeR2F}ÇÇÇÇÇÇÇÇÇÇÇÇ_{s2etgµS2NPRiFo0t}ÇÇÇÇÇÇÇÇÇÇÇ^ooea0ntcbte_µ^ooRinlFÇÇÇÇÇÇÇÇÇÇÇ^{mfiettyicmao4le}ÇÇÇÇÇÇÇÇÇÇÇ^m0Inn0msd_µ^teeÇÇÇÇÇÇÇÇÇÇÇ^aFdnbdiMleiÇÇÇÇÇÇÇÇÇÇÇ^{tidny ES}ÇÇÇÇÇÇÇÇÇÇÇ^R ÇÇÇÇÇÇÇÇÇÇǹ⁰⁰ÇÇÇÇÇÇÇÇÇÇÇ^0µFÇÇÇÇÇÇÇÇÇÇÇ
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
1/ESR
Figure 2
Load
Voltage
∆ VL
Figure 1
4
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