STCF07

Detailed description

Doc ID 16757 Rev 3

13/26

8.6

STCF07 protection features

8.6.1

Peak current and short-circuit protection

When the peak inductor current exceeds the maximum switch peak current limit of 2.3 A, the

PWM controller turns off and is enabled at the next oscillation period.

8.6.2

Overvoltage protection

The device includes power failure protection, which stops the operation of the PWM

8.6.3

Thermal shutdown protection

Internal thermal shutdown protection switches off the device when the junction temperature

exceeds 140 °C (typ). The hysteresis comparator allows the PWM controller to restart

automatically when the temperature is reduced to 120 °C.

8.6.4

Sensing of LED temperature with the NTC resistor

The device is capable of switching off the power circuit when a high temperature on the LED

is detected. (see

Figure 5).

If the sensing LED temperature feature is not used, NTC pin must be left floating and RX pin

must be grounded.

Figure 4.

Startup: LED current rise time

T

ENABLE

I

OUT

I

LED

T

ENABLE

I

OUT

I

LED