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/etc... Amplifiers & Other Linear
/etc... Amplifiers & Other Linear Forum
Looking for suggestions for a suitable replacement for the obsolete LM12 (LM12CLK).
Needs to be able to source/sink 5A (min), GBW 1MHz (min), min operating voltage +/-10V (or 20V)
Needs to be stable driving assorted LDO inputs at operating input voltages (3V to 20V) and input capacitance (1uF to 10uF) with normal output load current range (10mA to 3A), capable of drive fast voltage step (Vin+/-1V to Vin+/-2V) for line transient testing. DC gain will be low 2x or 5x, but not unity.
LM675 is probably not going to work due to the lower output current (3A) and bandwidth.
I am characterizing the OPA564 now, although the bandwidth is fine, the maximum output current (1.5A) is not adequate so there is extended rise/fall times to charge/discharge the input capacitance.
I have seen the datasheet for the APEX PA09, which looks promising, but at US$ 248 per unit (DigiKey) I'm going to keep looking around for awhile.
The LM3886 is generally considered a replacement for the LM12, though it is NOT unity gain stable (gain of 10 min). The LM3875 is also an option. Pretty much any of the high power linear audio amps can be used as a replacement, but just watch the minimum gain requirements.
Integrated Signal Chain Applications, SVA
Although not an exact replacement for the LM12, take a look at the OPA541 specifications. It will operate with +/-10 V supplies and is rated for 10 Amps peak output current. The ac performance appears to be in line with your requirements as well. The large load capacitance you mention can usually be dealt with using appropriate compensation. You can find the OPA541 data sheet here:
If you don't quite need 10 A, the OPA549 at 8 Amps output is another amplifier to consider.
PA - Linear Applications Engineering
Thanks for your suggestions. Much appreciated.
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