Other Parts Discussed in Thread: TPS63027, TPS63020
Dear friends,
Please help to solve "Power up" problem for TPS63070 adjustable Buck-Boost Converter, that we plan to use in our new design
1. Problem description:
The converter fails to reach the desired output voltage 5.36V upon power up with resistive loads more than 0.7A (the design requirement for the output load is 0..1.5A)
- For example, after power up, the output voltage sets to 4.86V @ 0.9A load and to 3.55V @ 1.5A load
- The power good output (PG) remains "Low"
Once the converter starts "NOT OK", reducing the load to the level below 0.7A cause to output voltage rise to desired value 5.36V and to PG output rise to "High". At this stage, the output load can be increased up to 1.5A and converter will continue to operate properly
The same is, if the converter starts "OK" with the output loads below 0.7A - than, the load can be increased up to 1.5A and converter will continue to operate properly
2. Design spec:
Input voltage: 4.75V...5.25V, provided by DC/DC isolated supply 24V/5V, 12W
Output voltage: 5.36V±1.5%
Output current: 0..1.5A