AN3338 datasheet(24/72 Pages) STMICROELECTRONICS

Part #	AN3338

Description	In recent years the variable speed motor control market has required high performance

PDF	72 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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24 / 72 page

Electrical characteristics and functions

AN3338

24/72

Doc ID 18441 Rev 4

2.3.5

Comparators for fault sensing

The SLLIMM family integrates up to three comparators (with reference to the product line-up

Table 1) intended for advanced fault protection, such as overcurrent, overtemperature or

any other type of fault measurable via a voltage signal. Each comparator has an internal

reference voltage VREF, specified in the datasheet, on its inverting input (see Figure 10),

while the non-inverting input is available on CIN pins (one per half bridge). The comparators

input can be connected to an external shunt resistor, in order to implement a simple

overcurrent or short-circuit detection function, as discussed in detail in

Section 2.3.6: Short-

circuit protection and smart shutdown function. Nevertheless, in the case of three internal

comparators, they can be separately used in order to implement three independent controls.

Figure 14. Timing chart of dead time function

AN3338 Datasheet(PDF) 24 Page - STMicroelectronics