Other Parts Discussed in Thread: TLV707,
Hi Team,
My customer want to know what's the slew rate of TLV707 and TLV711.
Is this able to calculate if the output cap is fixed?
How to adjust the slew rate?
Thanks
Shaq.
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Hi Shaq,
These devices have an internal current limit feature. Current limit specs are shown in the Electrical Characteristics and Typical Characteristics sections of the datasheet. During startup, the current that charges the output capacitor and supplies the load is limited to Icl:
Icl = Cout*dVout/dt + Vout/Rl
Solving this differential equation gives a function for Vout in terms of Icl, Cout, and Rl (load resistor):
Vout = Icl * Rl * {1 - exp[-t/(Cout*Rl)]}
To approximate the time required for the output to reach its final value, set Vout = Vout,nom and solve for t = tr:
tr = - Rl * Cout * ln[1 - Vout,nom/(Icl * Rl)]
As can be seen from this equation, increasing the output capacitor or the load current (decreasing Rl) will increase the rise time and therefore decrease the output slew rate. The output slew rate is calculated as:
Output Slew Rate = Vout,nom / tr
Thanks,
Gerard