LT1460-10 View Datasheet(PDF) - Linear Technology
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LT1460-10 Datasheet PDF : 12 Pages
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LT1460-10
APPLICATIONS INFORMATION
current step of 1mA or 100µA for RL = 1k or RL = 10k.
Figure 2 shows the response of the reference with no load
capacitance.
The reference settles to 10mV (0.1%) in 0.4µs for a 100µA
pulse and to 0.1% in 0.8µs with a 1mA step. When load
capacitance is greater than 0.01µF, the reference begins to
ring due to the pole formed with the output impedance.
VIN = 12.5V
CIN
0.1µF
LT1460-10
VOUT
RL
CL
VGEN
10V
9V
1460-10 F01
Figure 1. Response Time Test Circuit
Figure 3 shows the response of the reference to a 1mA and
100µA load with a 0.01µF load capacitor.
Fast Turn-On
It is recommended to add a 0.1µF or larger input capacitor
to the input pin of the LT1460-10. This helps stability with
large load currents and speeds up turn-on. The LT1460-10
can start in 10µs, but it is important to limit the dv/dt of the
input. Under light load conditions and with a very fast
input, internal nodes overslew and this requires finite
recovery time. Figure 4 shows the result of no bypass
capacitance on the input and no output load. In this case
the supply dv/dt is 12.5V in 30ns which causes internal
overslew, and the output does not bias to 10V until 60µs.
A 0.1µF input capacitor guarantees the part always starts
quickly as shown in Figure 5.
VGEN
VOUT
VOUT
10V
9V
RL = 10k
RL = 1k
2µs/DIV
Figure 2. CL = 0
1460-10 F02
12.5V
VIN
0V
VOUT
0V
20µs/DIV
Figure 4. CIN = 0
1460-10 F04
VGEN
VOUT
VOUT
10V
9V
RL = 10k
RL = 1k
10µs/DIV
1460-10 F03
Figure 3. CL = 0.01µF
12.5V
VIN
0V
VOUT
0V
20µs/DIV
Figure 5. CIN = 0.1µF
1460-5 F04
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