AN2378 datasheet(7/13 Pages) STMICROELECTRONICS

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AN2378 Datasheet(PDF) 7 Page - STMicroelectronics

Part #	AN2378

Description	Software filter algorithm for open-load

PDF	13 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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7 / 13 page

AN2378

Open-load detection of L9935

Doc ID 12435 Rev 3

7/13

Open-load detection of L9935

The open-load detection is done during flyback, using fast decay. The fast decay path is

shown in Figure 4: the coil energy, stored in LM is fed back from GND to VBatt.

Figure 4.

Open-load detection during free-wheeling

If the voltage drop at Rshunt plus RDS,ON of TLSl does not reach the reference voltage Vref, an

open-load failure is detected. A failure is flagged only if the failure lasts longer than 16 µs.

Figure 5.

Open-load measurement concept with simplified Vmes curve (if Vmes < 0 V

TLSI is switched off)

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