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Part Number: LM1084 Other Parts Discussed in Thread: LP395
Tool/software:
I'm looking to regulate a 24-28V 5A supply down to 22V, removing any ripple etc. Is this a suitable device? Is there a recommended configuration or precautions?
Yes, this is a suitable device for your application. At 5A, you are right at the edge of the max current for this device and with the max dropout voltage of 1.5V, you have 0.5V of headroom on VIN at 24V Input. So please pay close attention to input voltage droop (which can make the LDO go out of regulation) and inrush currents (which may cause current limiting). The configuration in fig 7.1 of the datasheet is recommended.
With the above voltages, currents, I would like to switch the device on/off with TTL. Can I use 2N30904 NPN with the two resistors, configured as in sect 7.2.3 ?
I assume you mean 2N3904 NPN? Yes, you can use the configuration shown on fig 7-3. TI does not make 2N3904 so I cannot speak to its specific ratings however any NPN transistor with Vbe_max >TTL (High), Vce_max > Vadj_max and Ice_max > 50 mA should work. I suggest using TI's LP395 if possible.
