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LM324ISO14X Fiches technique(PDF) 11 Page - Cadeka Microcircuits LLC.

No de pièce LM324ISO14X
Description  Low Power, 3V to 36V, Single/Dual/Quad Amplifiers
Download  15 Pages
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Fabricant  CADEKA [Cadeka Microcircuits LLC.]
Site Internet  http://www.cadeka.com
Logo CADEKA - Cadeka Microcircuits LLC.

LM324ISO14X Fiches technique(HTML) 11 Page - Cadeka Microcircuits LLC.

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Data Sheet
©2011 CADEKA Microcircuits LLC
www.cadeka.com
11
(VLOAD)RMS = VPEAK / √2
( ILOAD)RMS = ( VLOAD)RMS / Rloadeff
The dynamic power is focused primarily within the output
stage driving the load. This value can be calculated as:
PDYNAMIC = (VS+ - VLOAD)RMS × ( ILOAD)RMS
Assuming the load is referenced in the middle of the pow-
er rails or Vsupply/2.
Figure 4 shows the maximum safe power dissipation in
the package vs. the ambient temperature for the pack-
ages available.
0
0.5
1
1.5
2
2.5
-40
-20
0
20
40
60
80
Ambient Temperature (°C)
SOT23-6
SOT23-5
SOIC-16
Figure 4. Maximum Power Derating
Driving Capacitive Loads
Increased phase delay at the output due to capacitive load-
ing can cause ringing, peaking in the frequency response,
and possible unstable behavior. Use a series resistance, RS,
between the amplifier and the load to help improve stability
and settling performance. Refer to Figure 5.
+
-
Rf
Input
Output
Rg
Rs
CL
RL
Figure 5. Addition of RS for Driving
Capacitive Loads
Table 1 provides the recommended RS for various capaci-
tive loads. The recommended RS values result in <=1dB
peaking in the frequency response. The Frequency Re-
sponse vs. CL plot, on page 6, illustrates the response of
the LM358/LM324.
CL (pF)
RS (Ω)
-3dB BW (kHz)
1nF
0
485
5nF
0
390
10nF
0
260
100
0
440
Table 1: Recommended RS vs. CL
For a given load capacitance, adjust RS to optimize the
tradeoff between settling time and bandwidth. In general,
reducing RS will increase bandwidth at the expense of ad-
ditional overshoot and ringing.
Overdrive Recovery
An overdrive condition is defined as the point when either
one of the inputs or the output exceed their specified volt-
age range. Overdrive recovery is the time needed for the
amplifier to return to its normal or linear operating point.
The recovery time varies, based on whether the input or
output is overdriven and by how much the range is ex-
ceeded. The LM358/LM324 will typically recover in less
than 30ns from an overdrive condition. Figure 6 shows the
LM358 in an overdriven condition.
Figure 6. Overdrive Recovery
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
0
20
40
60
80
100
Time (us)
Output
Input
VIN = 1.25Vpp
G = 5


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