8.3.7.1 IADJ Pin Clamp

The IADJ pin incorporates an internal 2.4-V clamp. An area of inaccuracy in the clamp knee point voltage requires the designer to consider how to mitigate this situation when selecting an IADJ pin voltage. The most accurate method is to apply 2.2 V to the IADJ pin, which allows it to remain below the clamp knee-point voltage area. If an accurate, external, 2.2-V (or lower) reference is not available, use the next most accurate control method which is the internal clamp. The least accurate method uses a resistor divider on the VCC pin. The Analog and PWM Dimming - Normalized Results and Comparison section includes measured analog dimming results.