BD9E303EFJ-LB Datasheet, PDF (15/31 Pages) Rohm – Over-Current Protection

BD9E303EFJ-LB
Datasheet
Function Description
1. Enable Control
The IC shutdown can be controlled by the voltage applied to the EN terminal. When EN voltage reaches 2.5V, the internal
circuit is activated and the IC starts up. Setting the shutdown interval (Low Level interval) of EN to 100µs or longer will
enable the shutdown control with the EN terminal.
VEN
EN terminal _VENH
VENL
0
t
VOUT
Output Voltage
VOUT×0.85
0
t
TSS
Figure 37. Timing Chart with Enable Control
2. Protective Functions
The protective circuits are intended for the prevention of damages caused by unexpected accidents. Do not use
them for continuous protective operation.
(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 0.7V (Typ) and remained in that state for 1.0msec (Typ), SCP activates and
stops the operation for 14msec (Typ) and subsequently initiates a restart.
EN pin
2.5V or higher
0.8V or lower
Table 1. Short Circuit Protection Function
FB pin
Short circuit protection
0.30V (Typ) ≥FB
0.30V (Typ)<FB≤0.7V (Typ)
Enabled
FB>0.7V (Typ)
-
Disabled
Switching Frequency
75kHz (Typ)
150kHz (Typ)
300kHz (Typ)
OFF
Figure 38. Short Circuit Protection (SCP) Timing Chart
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TSZ22111•15•001
15/28
TSZ02201-0J3J0AJ00650-1-2
13.Feb.2015 Rev.002