Other Parts Discussed in Thread: TPS54335A
Hi Expert,
My customer wants to calculate Hiccup time in second but its typical period is defined with "cycle" as follows.
=== quoted from datasheet ===
CURRENT-LIMIT
Hiccup wait time 512 Cycles
Hiccup time before restart 16384 Cycles
THERMAL SHUTDOWN
Thermal shutdown hiccup time 32768 Cycles
===
I think the cycle is generated the oscillator for switching and there is no other specific timer for each Hiccup time. But I couldn't find any equation to define switching frequency with Rrt resistor in datasheet.
Q1. How can the customer calculate R7 value, 140.6kHz to set 340kHz switching frequency as described in 8.2 Typical Application section in the datasheet?
Q2. If the customer set 340kHz switching frequncy, 1 cycle will be 2.94uS. So, in this example, each hiccup time will be as follows Is this correct understanding?
Hiccup wait time 512 Cycles = 512 * 2.94uS = 1505.28uS = 1.5mS
Hiccup time before restart 16384 Cycles = 16384 * 2.94uS = 48168.96uS = 48.2mS
Thermal shutdown hiccup time 32768 Cycles = 32768 * 2.94uS = 96337.92uS =96.3mS
Regards,
