Part Number:MC34063A
Dear Sir or Madam,
When deciding on a timing capacitor, the following questions should be addressed, so please give me good advice.
The following formula which described in
the Application Report: SLVA252B
Chapter 3.4 Timing Capacitor Calculation
the formula:
Ct = Ichg (min) * (Δt / ΔV)
= 20 x 10-6 * (ton / 0.5)
= 4.0 × 10-5 * (ton)
it has become "Ichg (min) = 20 uA".
However, Ichg specifications have become
24uA (min), 35uA (typ), 42uA (max)
on MC34063A data sheet: SLLS636N.
The value of Ichg(mini) is different between the two.
How should I think about "Ichg (min): 20uA" in the equation for Ct?
Sincerely yours,
Hirofumi Sekido