When choosing a power switch to control Vbus in Host or OTG applications, what parameters are important to consider?
The switch chosen should provide short circuit protection, and it should prevent back drive when in the off state even if the +5V source is not present. Also, the sense of the on/off control should be considered. The POR state of the CPEN signal from the USB3300 is low. If the switch is active low, Vbus will be on at power up. Most commonly the user will choose a switch with an active high control input. Of course, the switch should be capable of supporting the expected current to be drawn from it. Some switches provide a fault indication output; be sure to use a pull-up resistor on this signal if the switch output is open collector/drain.
Related Questions
- What should I do to control the GEOtronic®s thermal power and to switch the Thermo-Regulator from cooling to heating mode?
- Can I control the amp block parameters like the boost switch, Eq, or drive parameter w/ MIDI CCs?
- When used in substrate bias applications, is the RF Power or DC Bias control mode best ?
