MCP73831 Pin Function Overview
Thought for 25 sec
Using the provided values:
- MOSFET Gate Charge (Q₍g₎): Example value of 30 nC (from your MOSFET’s datasheet)
- Additional Charge (Q₍extra₎): 5 nC (calculated as 1 µA × 5 µs)
- Allowed Voltage Droop (ΔV₍boot₎): 0.5 V
The minimum bootstrap capacitor required is calculated as:
Applying a safety factor of 10 for robust design:
A standard capacitor value near or above 700 nF (for example, 680 nF or 1 µF) would be appropriate.
Q total is 86nC, VCC is between 10-14V, i'm using 1N5829 bootstrap diode and LTC4446 driver
Thought for 20 sec
Using the provided parameters:
- Total Gate Charge (Qₜₒₜₐₗ): 86 nC
- Additional Charge (Q₍extra₎): 5 nC (assuming 1 µA leakage over 5 µs)
- Allowed Voltage Droop (ΔV₍boot₎): 0.5 V
Calculation Steps:
-
Calculate the Minimum Required Capacitance:
-
Apply a Safety Factor of 10:
Final Design Recommendation:
Select a standard bootstrap capacitor value near or above 1.82 µF (for example, 2.2 µF) to ensure robust operation.
Select a standard bootstrap capacitor value near or above 1.82 µF (for example, 2.2 µF) to ensure robust operation.
This calculation takes into account your driver (LTC4446), the MOSFET's parameters, and the chosen bootstrap diode (1N5829) under the given supply voltage (10–14 V).
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