STCF07 Datasheet, PDF (13/26 Pages) STMicroelectronics – High power buck-boost white LED driver

STCF07
Figure 4. Startup: LED current rise time
ENABLE
Detailed description
I_OUT
I_LED
T_ON < 2 ms
8.6
8.6.1
8.6.2
8.6.3
8.6.4
STCF07 protection features
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.
Overvoltage protection
The device includes power failure protection, which stops the operation of the PWM
controller when the voltage at the pin V_OUT exceeds the OVP threshold. When the voltage
on pin V_OUT is reduced by OV_HYST, the operation of the controller recovers automatically.
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.
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.
Doc ID 16757 Rev 3
13/26