Other Parts Discussed in Thread: TPS7A47
Hello,
I'm trying to convert 20V/5A SMPS power to 18~19V for my noise sensitive application. I couldn't find a good buck converter for my design.
I came across High-Current Low-Noise Parallel LDO Reference Design (http://www.ti.com/tool/TIDA-01232 ) and I want to implement this concept to my design.
Due to thermal issues, I'm planning to split the currents to 3 LDOs and have around 2A load per LDO.
1. Can the circuit below work?
2. From the design document, I need to add a Ballast resistor and if I add the Ballast resistor like the figure 1 below, can I use a ceramic capacitor instead of Tantalum or aluminum?
3. If LM1085 can't be used for my application, is there a good alternative of LM1085?
I'm willing to spend up to $6 just for the LDOs ($1.5(@4ku) x 4ea or $2(@3ku) x 3ea)
20V w/ tolerance input and 18V/5.5A output needs be supported.
Figure 1.