MIC45404 Datasheet, PDF (18/32 Pages) Microchip Technology – 19V 5A Ultra-Low Profile DC-to-DC Power Module

MIC45404
Figure 4-2 illustrates the Hiccup mode short-circuit pro-
tection logic flow. Note that Hiccup mode short-circuit
protection is active at all times, including the soft start
ramp.
START
CLEAR
LS OC EVENTS
COUNTER
CLOCK PULSE
(MARKING HS
TURN-OFF,
LS TURN-ON)
NO
LS OC EVENT
DETECTED?
IDLE LOOP
IN NORMAL
OPERATION
YES
EVENT
COUNTER = 0
YES
EVENT COUNTER
FULL?
YES
NO
INCREMENT
EVENT
COUNTER
INITIATE HICCUP
SEQUENCE
STOP SWITCHING
HS AND LS
NO
DECREMENT
EVENT
COUNTER
FIGURE 4-2:
CYCLE THREE TIMES
INTERNAL SOFT START
CAPACITOR
INITIATE SOFT START
ENABLE SWITCHING
CLEAR
LS OC EVENTS
COUNTER
Hiccup Mode Short-Circuit Protection Logic.
DS20005478A-page 18
 2015 Microchip Technology Inc.