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Feedback Modulation. By adding a voltage drop between the FB pin and Rl, as shown in schematic 2, the LED current, ILOAD, can be made to decrease. As Vc (control voltage) increases, the voltage drop across R2 also increases This causes the voltage at FB to increase, and the A8431 reduces ILOAD to compensate. As Vc increases further, the current drops t0 0 A, and R2 maintains the full 95 mV on FB Reducing Vc diminishes the voltage across R2 until, when VC is at 95 nN there is no drop across R2 and the current levelis defined by Rl. Reducing Vc below 95 mV causes ILOAD to increase further, due to the voltage drop across R2 in the reverse direction. This continues until, when Vc is at 0 V, there is approximately 5 mV across R2. At that point, ILOAD (mA), is defined as:
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