FP7102

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Rev. 0.93

8/12

Detailed Description

Voltage Reference

A built-in 2.5V reference regulator supplies FP7102 internal circuits. Also, this 2.5V reference

voltage is divided down by an internal resistive divider to provide a 0.25V precision reference voltage to

the error amplifier non-inverting terminal.

Setting the LED Current

as shown in the Typical Application Circuit section. The FB pin is 0.25V in regulation. Therefore, the

equation:

2

FB

F

R

V

I



be approximately 0.13

Ω.

Output Voltage

)

V

)

V

n

((

V

FB

F

OUT







datasheet for forward characteristics curve)

Oscillator

The fixed PWM frequency is generated by an internal oscillator. Its typical values are 320KHz.

Thermal Protection

The thermal protection is triggered when junction temperature is higher than 150

℃ that may

occurs by an abnormal heavy current loading. When this happens, the FP7102 turns output off. Once

the junction temperature is cooled down to lower than 130

℃, FP7102 starts again and turns the power

switch on.