STELPD01 datasheet(10/27 Pages) STMICROELECTRONICS

10 / 27 page

On the auto-retry version (STELPD01A), the EN/Fault pin is pulled down and the device attempts to turn on

output channel with soft-start ramp after a delay time of 100 µs.

The RLIM value for achieving the requested current limitation can be estimated by using the following table

together with the graph in Figure 9 and Figure 10.

Table 9. ILIM vs. RLIM

RLIM [Ω]

120

220

300

ILIM [A]

6.45

5.15

3.9

3.55

2.4

2.1

1.55

1.4

Note:

Missing or shorted RLIM causes current limit circuit malfunction and may lead to device damage.

Note:

RLIM value higher than 300 Ω can be used but as shown in Figure 9 the ILIM vs. RLIM relationships is flat.

6.6

Thermal shutdown function

If the device temperature exceeds the thermal shutdown threshold (TSHDN), typically 165 °C, the power MOSFET

is turned off and the load is disconnected.

On the latched version (STELPD01), the EN/Fault pin of the device is automatically set to the intermediate

voltage VI(INT), in order to signal the overtemperature event to the system controller.

The device can be reset from this condition either by cycling the supply voltage or by pulling down the EN pin

below the VIL threshold and then releasing it.

On the auto-retry version (STELPD01A), the EN/Fault pin is set low, and the auto-retry circuit attempts to restart

the device with soft-start ramp once the die temperature is reduced to 145 °C typ. (165 °C minus the hysteresis

value, 20 °C typ.).

6.7

EN/Fault pin

The EN/Fault pin has the dual function of controlling the output of the device and providing information about the

device status to the application.

When it is used as a standard Enable pin, it can be connected to an external open-drain or open-collector device.

In this case, when it is pulled at low logic level, the device turns the output off, when it is left floating the device

turns on the output, since it has internal pull-up circuitry.

In case of a fault, on the latched versions, this pin is set to the intermediate voltage VI(INT), this signal can be

provided to a monitor circuit, informing it that a fault event has occurred or it can be directly connected to the

EN/Fault pins of other devices of the same family on the same application in order to achieve a simultaneous

enable/disable feature. In case of UVLO event (VIN = VUVLO - Vhyst) an internal pull-down block is activated in

order to keep the device in off-state.

STELPD01

Thermal shutdown function

DS13254 - Rev 1

page 10/27

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