BD9610AMUV-E2 Datasheet, PDF (15/30 Pages) Rohm – 60V Synchronous Step-down Switching Regulator(Controller type)

BD9610AMUV
＜Pulse by pulse protection＞
The detection of OCP doesn’t work for almost 60ns as the blanking time against to the ringing noise,
also has the delay time for almost 140ns.
When the switching frequency is high and the ratio of Vin and Vout is high, this IC may not detect the OCP.
Please take care for the min. pulse width and refer the graph of the item (13) About Output programmed voltage
range on the following page graph.
＜Hiccup protection＞
When the OCP is detected in the two series pulse or every one pulse (two time detecting in the three series pulse),
the outputs, FB and SS are turned off for a OCP shut-down hold cycles (32768 clock cycles).
(ex.) FOSC=300kHz
OCP shut-down hold cycles (THICCUP) = T(=1/FOSC)×32768
= (1/300k)×32768 = 108 [ms]
At the end of the OCP shut-down hold cycles, the soft start begins automatically.
OCP blanking time
tocp_mask=60nsec
OCP is detected OCP isn’t detected
OCP is detected
HG
LG
LX
Anti cross conduction
tdrv_off=100nsec
(ocp)
OCP monitoring time
（Pulse-by-pulse）
OCP propagation delay time
tocp_delay=140nsec
Pre-bias sequence
①
②
③
（hiccup）
SS
OFF
①
Don’t discharge CSS
②
③
OCP shut-down hold time
thiccup=(1/fosc)×32678[sec]
If OCP is detected in two of three series pulses,
CSS is discharged and turn off HG and LG during
thiccup. After thiccup, soft-start begins.
Soft ^start
Fig.31 ^OO^CC^PP^TIT^MI^IM^NGIN^CG^HAC^RH^TA^（※RT^B(^e※^caB^use^ec^oa^fu^es^xe^plaoⁱⁿf ⁱe^ngx^,p^thla^isin^ci^hn^ag^rt, ^hth^asis^amch^bia^gurt^ith^y a^os^{f t}a^imm^e）biguity of time )
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TSZ22111・14・001
15/27
TSZ02201-0Q1Q0AJ00010-1-2
24.OCT.2014 Rev.002