MC33348
Figure 12. Additional Discharge Current Limit Delay
3
Cdly
MC33348
84
6
5
Rdly
The discharge current limit shutdown delay time is typically 3.0 ms.
This time can be extended with the addition of components Rdly and
Cdly. With an Rdly of 5.1 k and Cdly of 10 μF, the current limit shutdown
time is extended to 40 ms.
The additional discharge current limit delay circuitry must not be
used if the anticipated open−circuit charger voltage will exceed 6.0 V.
When the charger causes the battery pack input to exceed 6.0 V,
additional current will flow out of Pin 5, creating a voltage drop across
resistor Rdly. This voltage drop causes the source of MOSFET Q1 to
fall below it’s gate, allowing it to unexpectedly turn back on.
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