L6730B datasheet(21/52 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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21 / 52 page

L6730 - L6730B

Device description

Doc ID 11938 Rev 3

21/52

negative. This situation happens when the converter is sinking current for example and, in

this case, an adaptive dead time control operates.

5.8

Monitoring and protection

The output voltage is monitored by the FB pin. If it is not within ±10% (typ.) of the

programmed value, the Power-Good (PGOOD) output is forced low. The PGOOD signal can

be delayed by adding an external capacitor on PGDelay pin (see Table 4: Pin connection

and Figure 14.); this can be useful to perform cascade sequencing. The delay can be

calculated with the following formula:

The device provides over voltage protection: when the voltage sensed on FB pin reaches a

value 20% (typ) greater than the reference, the low-side driver is turned on. If the OVP not-

latched mode has been set the low-side MOSFET is kept on as long as the overvoltage is

detected (see Figure 15.).The OVP latched-mode has been set the low-side MOSFET is

Figure 13.

Dead times

( )

PGDelay

⋅

= 5

L6730B датащи(PDF) 21 Page - STMicroelectronics