BD9E302EFJ Datasheet, PDF (16/44 Pages) Rohm – Integrated MOSFET Single Synchronous Buck DC/DC Converter

BD9E302EFJ
Datasheet
2) Enable Control
The IC shutdown can be controlled by the voltage applied to the EN terminal. When EN voltage reaches 2.5 V, the
internal circuit is activated and the IC starts up. To enable shutdown control with the EN terminal, set the shutdown
interval (Low level interval of EN) must be set to 100 µs or longer.
EN terminal
Output setting voltage
Figure 35. Timing Chart with Enable Control
3) Protective Functions
The protective circuits are intended for prevention of damage caused by unexpected accidents. Do not use them
for continuous protective operation.
3-1) Short Circuit Protection (SCP)
The short circuit protection block compares the FB terminal voltage with the internal reference voltage VREF. When
the FB terminal voltage has fallen below 0.56 V (Typ) and remained there for 0.9 msec (Typ), SCP stops the operation
for 14.4 msec (Typ) and subsequently initiates a restart.
EN pin
Table 1. Short Circuit Protection Function
FB pin
Short Circuit Protection
Switching Frequency
2.5 V or higher
0.8 V or lower
0.30V (Typ)≥FB
0.30V (Typ)< FB≤0.56V (Typ)
FB>0.56V (Typ)
-
Enabled
Disabled
137.5kHz (Typ)
275kHz (Typ)
550kHz (Typ)
OFF
Figure 36. Short circuit protection function (SCP) timing chart
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TSZ02201-0J3J0AJ00890-1-2
27.Apr.2016 Rev.002