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GOAL:
To establish an EFuse to protection the Radio Module from shorts and over current draws
PARAMETERS:
- Radio Module - Finalized Power Budget
- Nominal Current: 300mA
- Peak Current: 650mA
Design Ideas:
- Copy Sensor Modules solution
- TBD
- TPS2552/TPS2553
- Adjustable EFuse by TI
- Fuse limit between 0.075A to 1.7A
- Vin between 2.5V to 6.5V
- Typically used in USB charging devices
- 6 pin, easily to solder package.
- Available on JLCPCB
- Relatively cheap (<$5 per)
- We can save more money by using a WSON package
- Differences between the two TPS IC's
- TPS2552 - Active Enable Low
- TPS2553 - Active Enable High
- Current Application Schematic Reference
- Adjustable EFuse by TI
Auto-retry (TPS2553)
- During over current condition, FAULT pulls low, discharging the capacitor
- C_RETRY begins to charge
- Once V_EN reaches the threshold voltage to turn on, it will retry
<Excel Sheet for calculating RLim>
View file name TPS2552 RILIM Calculator Nov17.xls height 250