參數(shù)資料
型號: L6730BTR
廠商: 意法半導體
英文描述: Adjustable step-down controller with synchronous rectification
中文描述: 可調式降壓同步整流控制器
文件頁數(shù): 21/52頁
文件大?。?/td> 1370K
代理商: L6730BTR
L6730 - L6730B
Device description
21/52
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 3: Pins connection
and
Figure 13.
);
this can be useful to perform cascade sequencing. The delay can be calculated with the
following formula:
(
pF
C
PGDelay
=
5
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 14.
).The OVP latched-mode has been set the low-side MOSFET is turned
on until V
CC
is toggled (see
Figure 15.
). In case of latched-mode OVP the OSC pin is forced
high (4.5V typ) if an over voltage is detected.
Figure 13. PGOOD signal
)
2ms/Div.
PGOOD
FB
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