MLX10801 Просмотр технического описания (PDF) - Melexis Microelectronic Systems

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MLX10801

Power LED driver for automotive applications Power saving low side coil driver Electronic fuse

Melexis Microelectronic Systems  

IC specification MLX10801

Power LED driver for automotive applications

Power saving low side coil driver

Electronic fuse

The idea is to decouple the node COIL from RSENSE so that the switch off voltage can not be reached.

Thus, parasitic switching is avoided.

Instead of using RF and CF, “parasitic switching” can also be avoided by a well chosen parameter set

(see also chapter 8.3) and a well designed PCB that avoids switching oscillations.

Note: Melexis designed in a debouncing time of 1µs to the internal comparator due to the fact that the

MLX10801 can be used with a wide range of inductances.

1.3. Electronic fuse applications

1.3.1. Electronic fuse schematic diagram

VBAT

CONTROL

10...100uF

100nF

47k

Calibration point

Calibration

point

VS

GND

TEST

CALIB

CONTR

DRVOUT

RSENSE

DSENSE

GND

RL

Calibration points

1.3.2. Electronic fuse application notes

The purpose of this application is the protection of an external load against overcurrent. In this mode, the switch

mode regulator is disabled. The driver is permanently ON as long as the current remains below a specified level.

Once this level is reached, the driver switches OFF and remains OFF until a POR is given.

A shutdown of the module due to overtemperature is also achievable if the internal or external temperature

sensor is used.

3901010801

Author: TFR revised: RAH/SSZ

Page 9/41

Rev 021 14/July/05

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