DocID025425 Rev 5

17/27

STBB3JCC

Application information

7.4.3

Overtemperature protection

An internal temperature sensor continuously monitors the IC junction temperature. If the IC

temperature exceeds 160 °C (typ.), the device stops operating. As soon as the temperature

falls below 140 °C (typ.), normal operation is restored.

8

Application information

8.1

Programming the output voltage

point of the divider must be connected to FB.

The value for the resistor R2, placed between FB and GND, should be chosen in order to

set the divider current at 10 µA. The recommended value for this resistor is in the range of

50 k

Ω but to reduce the power consumption a maximum value of 20 kΩ can be used.

voltage and can be calculated using the equation 1:

Equation 1

Figure 30. Application schematic

8.2

Programming the output constant current for HB WLED

Sensing resistor

The STBB3JCC feedback pin voltage is 100 mV, this makes the STBB3JCC suitable for

LED driver applications, minimizing the power dissipation across the external sensing

resistor and improving the overall system efficiency. The sensing resistor value is got by the

following formula:

R1

R2

V

OUT

V

FB

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1

–





×

=