STSPIN220 datasheet(15/27 Pages) STMICROELECTRONICS

15 / 27 page

The relationship between the OFF time and the external resistor value is shown in Figure 8. OFF time regulation

circuit. The value typically ranges from 10 µs to 150 µs.

Table 13. Recommended R

RCOFF and C RCOFF values according to R OFF

ROFF

RRCOFF

CRCOFF

10 kΩ ≤ ROFF < 82 kΩ

1 kΩ

22 nF

82 kΩ ≤ ROFF ≤ 160 kΩ

2.2 kΩ

22 nF

Figure 9. OFF time vs. ROFF value

100

120

140

100

150

200

Off resistor [kohm]

6.4

Overcurrent and short-circuit protection

The device embeds circuitry protecting each power output against the overload and short circuit conditions (short-

circuit to ground, short-circuit to VS and short-circuit between outputs).

When the overcurrent or short-circuit protection is triggered, the power stage is disabled and the EN\FAULT input

is forced low through the integrated open-drain MOSFET discharging the external CEN capacitor (refer to

Figure 10. Overcurrent and short-circuit protection management).

The power stage is kept disabled and the open-drain MOSFET is kept ON until the EN\FAULT input falls below

the VRELEASE threshold, then the CEN capacitor is charged through the external REN resistor.

STSPIN220

Overcurrent and short-circuit protection

DS11633 - Rev 4

page 15/27

STSPIN220 数据表(PDF) 15 Page - STMicroelectronics