TLE7209-2R datasheet(6/32 Pages) INFINEON

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TLE 7209-2R

Circuit Description

Preliminary Datasheet

V1.0, 2004-mar-12

2.2

Power Stages

Four n-channel power-DMOS transistors build up the output H-bridge. Integrated circuits

protect the outputs against over current and over-temperature if there is a short-circuit to

ground, to the supply voltage or across the load. Positive and negative voltage spikes,

which occur when switching inductive loads, are limited by integrated freewheeling

diodes. To drive the gates of the high-side DMOS, an internal charge pump is integrated

to generate a voltage higher than the supply voltage.

2.2.1

Chopper Current Limitation

To limit the output current at low power loss, a chopper current limitation is integrated as

shown in Figure 3. The current is measured by sense cells integrated in the low-side

switches. As soon the current limit

IL is reached, all switches are switched off for a fixed

time

ta.

Figure 3

Chopper current limitation

current limit I

off-time t

time

TLE7209-2R Datasheet(PDF) 6 Page - Infineon Technologies AG