Dear Sir
As title, we have 2 engineering questions about LP8548,
please kindly help to provide some suggestions, thanks a lot.
(1) Is Internal FET still working when we use “External Boost FET Case” ??
If it is working, we need to choose External FET's current(ids) rating specification which depend on Internal FET's ??
(2) Please check following 3 statements and correct any wrong description.
Statement(A) :
In “Internal Boost FET Case”, the overvoltage protection is configurable through the LP8548 EPROM (BL_VO_MAX).
There are only 4 options in the below table we can choose to set up limit voltage of overvoltage protection.
Statement(B) :
Overvoltage protection will be started when FB pin detects that Vout is greater than VMAX . VMAX is defind in the below table.
Statement(C) :
In “External Boost FET Case”, we want to set up limit voltage as 7.2.2.1.1.3. description as below.
The LP8548 EPROM (BL_VO_MAX) should be set as 10b so that Vmax(FB pin) approximate as 41.04V.
Thank you~
Best Regards
Richard Chen 陳俊叡
Quanta NB6 EE
TW Cell Phone : +886-988-321-162 (中華)
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Mail : Richard_Chen@Quantatw.com