L6730B datasheet(27/52 Pages) STMICROELECTRONICS

номер детали	L6730B

подробное описание детали	Adjustable step-down controller with synchronous rectification

PDF	52 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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27 / 52 page

L6730 - L6730B

Device description

Doc ID 11938 Rev 3

27/52

Working with a 12 V BUS, setting the UVLO at 8.6 V can be very helpful to limit the input

current in case of BUS fall.

5.9

Adjustable masking time

By connecting the masking time pin to VCCDR or GND it is possible to select two different

values for the peak current protection leading edge blanking time. This is useful to avoid any

false OCP trigger due to spikes and oscillations generated at the turn-on of the high-side

MOSFET(s). The amount of this noise depends very much on the layout, MOSFETs, free-

wheeling diode, switched current, and input voltage.

When good layout and medium current are used, the minimum masking time can be

chosen, while in case of higher noise, it is better to select the maximum masking time. By

connecting the tMASK pin to VCCDR the masking time is about 400 ns, while connecting it to

GND results in about 260 ns masking time.

5.10

Multifunction pin (S/O/U L6730) (CC/O/U L6730B)

With this pin it is possible:

●

To enable disable the sink mode current capability (L6730) or the constant current

protection (L6730B) at the end of the soft-start

●

To enable or disable the latch-mode for the OVP

●

To set the UVLO threshold for 5 V BUS and 12 V busses

Figure 22.

Valley OCP (L6730B)

VOUT

TOFF

Valley th

L6730B датащи(PDF) 27 Page - STMicroelectronics