L6611 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6611' PDF : 28 Pages View PDF
L6611
7 APPLICATION IDEAS
In fig. 23 a circuit is suggested to obtain the regulated +3.3V output with a linear configuration instead of the
Magamp circuitry.
In this case the output of the E/A modulates the gate-source voltage of a power MOS in series with the power
stage.
In fig. 24 a simple and cheap latch circuit is showed to manage an OV fault on the Auxiliary output in the same
way of an OC (UV) fault, without having recourse to a (expensive) power crowbar. By tuning the value of RSET
it is possible to set the voltage value that triggers the latch circuit; CDEL defines the turn-on delay. A diode con-
nected between the collector of Q1 and Cout pulls down the output of the auxiliary E/A: this has the same effect
of the OCP_bounce internal signal that guarantees the reduction of duty cycle.
Figure 23. Controlling a Linear Regulator with the Error Amplifier B
+5V
L
+12V
RB
C1
Bout
L6611
+3.3V
C2
RH
ZC
_
Binv
+
RL
+1.25V
Figure 24. Auxiliary OVP without Crowbar
100
DMON
Cout
L6611
D1
BAT42
Q1
BC548
5K6
Q2
BC558
CDEL
VAUX
RSET
5K6
25/28
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