In the previous article, an actual circuit example and component value calculations to make various settings for the power supply sequence specification ① were explained. Here, actual operations of the circuit are confirmed.
The circuit below is an example circuit implementing the power supply sequence ① described in the previous article. It is provided again for confirmation of the circuit operations.
Next, actual operation waveforms are presented.
When VOUT3 falls below 0.5 V, which is the threshold of the Power Good block IC4, the IC4 PGOOD output disables DCDC 2, and similarly the discharge circuit turns on and VOUT2 is drawn down.
When VOUT2 falls below 0.5 V, which is the threshold of the Power Good block IC2, as in the previous stage, the IC2 PGOOD output disables DCDC 1, the discharge circuit turns on, and VOUT2 is drawn down.
With this, all three shutdown sequences end, and all outputs are turned off.
From the next article, we will explain sequence specification ②.
・Confirm the specifications, circuit operations, and waveforms for power supply sequence ①.