300 SERIES USER GUIDE
14
Minimum Inductance
Table 3 lists the minimum inductance required for various amplifier and buss voltage
combinations.
Model 20V 40V 80V 160V
303,303B 63 uH 125 uH 250 uH N/A
306,306A,306AB 30 uH 63 uH 125 uH N/A
312 N/A 175uH 350uH 700 uH
Table 3
Maximum Inductance
There is no maximum inductance specified for the 300 series, however larger
inductances can reduce the bandwidth and produce excessive ringing in the amplifier's
response. The Standard column in the table below shows the load inductance which are
considered 'normal' for the 300 series amplifiers. The Dash-1 column shows the range of
load inductance which can be driven with amplifiers ordered with the -1 option (see
ordering guide in appendix). Load inductance higher than the maximum values in the
Dash-1 column will result in lower bandwidth, and may require component changes to
optimize compensation.
Model 40V 80V
Standard Dash-1 Standard Dash-1
303, 303B 63 uH to 1.9 mH 2 to 9 mH 125 uH to 3.9 mH 4 to 18 mH
306, 306A, 306AB 32 uH to 0.9 mH 1 to 4.5 mH 64 uH to 1.9 mH 2 to 9 mH
312 88 uH to 5.4 mH 5.5 to 25 mH 175 uH to 10.9 mH 11-50 mH
Table 4
Bandwidth
The bandwidth of an amplifier is the frequency at which the amplitude of the output
drops to 70% of the value at a much lower frequency. The effect of bandwidth is to
either limit the frequency of a sine-wave signal that can be amplified, or to limit the
risetime of a step-input signal. The type of load will also have an effect on the
bandwidth, particularly as the inductance increases.
Amplifiers with the -1 option (high inductance loads) will exhibit the specified
bandwidth at higher values of inductance than the standard amplifiers.
Table 5 shows the load inductance and resistance at which the standard and -1 option
amplifiers are rated for their 3 kHz bandwidths. As the load inductance increases beyond
the values listed in table 5, the bandwidth will decrease.
Model BW R L (std) L (-1)
303,303B 3kHz 2.5 250 uH 4 mH
306,306B 3kHz 1.0 125 uH 2 mH
306A,306AB 3kHz 1.0 125 uH 2 mH
312 3kHz 14 700 uH 11 mH
Table 5
BW ; -3dB small-signal bandwidth
R ; Load resistance in ohms
L (std) ; Load inductance in microhenries for standard amplifier
L (-1) ; Load inductance in millihenries for amplifiers with -1 option
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