L6610 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

L6610

DIGITALLY PROGRAMMABLE SECONDARY HOUSEKEEPING CONTROLLER

STMicroelectronics 

L6610

7 APPLICATION IDEAS

In fig. 26 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. 27 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 26. Controlling a Linear Regulator with the Error Amplifier B

+5V

L

+12V

RB

C1

Bout

L6610

+3.3V

C2

RH

ZC

_

Binv

+

RL

+1.25V

Figure 27. Auxiliary OVP without Crowbar

100

DMON

Cout

L6610

D1

BAT42

Q1

BC548

5K6

Q2

BC558

CDEL

VAUX

RSET

5K6

26/29

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