參數(shù)資料
型號(hào)： L6566BTR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.8 A POWER FACTOR CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, SOP-16
文件頁(yè)數(shù)： 32/51頁(yè)
文件大?。?/td> 624K
代理商： L6566BTR
Application information
L6566B
38/51
Figure 25.
Brownout protection: internal block diagram and timing diagram
The brownout comparator is provided with current hysteresis in addition to voltage
hysteresis: an internal 15 A current sink is ON as long as the voltage applied on the
AC_OK pin is such that the AC_FAIL signal is high. This approach provides an additional
degree of freedom: it is possible to set the ON threshold and the OFF threshold separately
by properly choosing the resistors of the external divider (see below). With just voltage
hysteresis, instead, fixing one threshold automatically fixes the other one depending on the
built-in hysteresis of the comparator.
With reference to Figure 25, the following relationships can be established for the ON
(VsenON) and OFF (VsenOFF) thresholds of the sensed voltage:
Equation 16
which, solved for RH and RL, yield:
Equation 17
Sensed voltage
Vcc
(pin 5)
VsenON
VsenOFF
GD
(pin 4)
Vout
VAC_OK
(pin 16)
IHYS
15 A
t
AC_FAIL
0.45V
0.485V
-
+
L6566B
AC_FAIL
AC_OK
Vcc
16
5
0.485V
0.45V
15 A
RH
RL
Sensed
voltage
L
H
OFF
L
6
H
ON
R
45
.
0
R
45
.
0
Vsen
R
485
.
0
10
15
R
485
.
0
Vsen
=
+
=
45
.
0
Vsen
45
.
0
R
;
10
15
Vsen
078
.
1
Vsen
R
OFF
H
L
6
OFF
ON
H
=
=
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