| Electronics > Beginners |
| Linear Technology LT1963 1.5A LDO - Output current no more than 100mA! |
| << < (3/6) > >> |
| Nerull:
That's a SO-8 package, and its rated at about 70C/W, if it has 2500mm^2 of copper heatsinking on the board. That little breakout board is not going to put out 1.2A. |
| hgg:
Yes sorry, SO8. The breakout is only for testing. When I finish the prototype I am going to design a small 30x25mm pcb. Is it possible?... |
| David Hess:
It may also be oscillating with the capacitors so far away. Move the capacitor connections to a spot immediately adjacent to the regulator or even solder them onto the interposer. |
| hgg:
I've managed to get 800mA. Its the breadboard. Genuine Chiniseum. The trace on the oscilloscope is completely flat with non existent ripple or spikes even in the 2mV range. |
| hgg:
I have another problem... :palm: I have connected the FDS6898A N-Channel MOSFET in the circuit as in the schematic below : The 2.6V output of the LDO is very stable but when I connect the gate of the MOSFET to the 2.6V rail, the 2.6V rail becomes a 3.2V rail... :) Its like something is changing the ADJ pin voltage divider. Normally I measure the ADJ pin at 1.1V and when I connect the gate of the MOSFET directly to the 2.6V rail, I measure 1.4V on the ADJ pin. What am I doing wrong? |
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