AN280 datasheet(4/15 Pages) STMICROELECTRONICS

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Maximum ratings

AN280

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Doc ID 1703 Rev 3

Maximum ratings

The maximum voltage rating for the bridge driver can be derived from the maximum ratings

of the devices used in the output stage and are generally the BVceo or BVdss of the power

devices. In addition to the maximum allowable voltage across the output device, additional

limits may be needed on the maximum output voltage above supply or below ground,

depending on the implementation of the output stage.

As an example of a full-bridge circuit, consider the STMicroelectronics L6201, L6202 and

L6203. These devices are full-bridge drivers implemented with DMOS transistors on a

monolithic structure. Using these devices full-bridge drive circuits, like shown in Figure 1,

are easily implemented. The device has a maximum rating for the supply voltage of 60 V,

which implies a maximum BVdss for the output devices of 60 V. In addition, due to the

monolithic implementation, the voltage between the two output terminals must not exceed

60 V. Therefore, the maximum ratings that must be considered for the application are:

●

Vsupply: 60 V

●

Vds any output: 60 V

●

V01 - V02: 60 V

Similar maximum ratings exists for any full-bridge application, with the exception of the

differential output voltage limit, which doesn’t exist for discrete implementations.

Figure 1.

DC motor drive circuit using the L6203

AM15168v1

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