1. Product Overview & Purpose

️· What it is: An evaluation board specifically designed for the AP8802 LED driver IC.
️· Purpose: To allow users to test and experiment with the AP8802, understand its features, and design LED lighting solutions.
️· Target Audience: Engineers, designers, hobbyists working with LED lighting and power management.

2. AP8802 IC Features (as relevant to the evaluation board)

️· LED Driver: Designed for driving LEDs.
️· Soft Start: Built-in feature to prevent inrush current during startup. Can be adjusted via a capacitor (C2).
️· PWM Capability: Supports Pulse Width Modulation for dimming control. Requires removing the soft-start capacitor.
️· Current Control: Allows users to modify the LED current by changing the sense resistor (R1).
️· Shutdown: Can be shut down by grounding the CTRL pin.

3. Evaluation Board Features & Connections

️· LED Connections: Provides test points 'LED A' (anode) and 'LED K' (cathode) for connecting external LEDs. Supports up to 12 LEDs at 45V.
️· Power Connections: Requires a power supply (PSU) connected to VIN and GND.
️· Test Point J1: Provides access to the switching waveform on the SW pin for testing and analysis.
️· Removable Components:
- C2: Soft-start capacitor - remove for PWM operation.
- R1: Sense resistor - modify to change LED current.
️· Safety Precautions:
- No reverse battery protection.
- Avoid staring directly at LEDs.

4. Usage Instructions (Step-by-Step)

1. Connect external LEDs to 'LED A' and 'LED K'.
2. Connect VIN and GND to a PSU (12-45V).
3. Turn on the PSU (external LEDs should illuminate).
4. Use test point J1 for waveform observation.
5. For Soft-Start: use a capacitor with calculated capacitance to slow the rise time of the adjust pin
6. For PWM: Remove C2
7. For Shutdown: short CTRL to GND

5. Circuit Features - In Detail

️· Soft Start: Can be modified by changing the C2 capacitor.
️· PWM Dimming: Requires removal of C2.
️· Current Control: Modifiable by changing the value of sense resistor (R1) - formula provided.
️· Shutdown: Implemented by shorting the CTRL pin to ground.

6. Performance Characteristics

️· Efficiency: >90% achievable with a 45V supply and 12 LEDs at 200kHz switching frequency.

7. Important Notes & Safety Warnings

️· No Reverse Polarity Protection: Ensure correct polarity when connecting power.
️· Eye Safety: Avoid direct observation of LEDs.
️· Life Support Devices: The AP8802 is not approved for use in life-support systems without explicit written approval.
️· Patent and Trademark notices: included.