1. Overview and Purpose

️· Product: MPS EV3378-S-00A – a combined Boost LED Controller and Buck Converter. It's designed for LED lighting applications.
️· Document Purpose: This document provides information about the EVB (Evaluation Board) for the EV3378, including schematic, board layout, test results, and a quick start guide.
️· Key Functionality:
- Boost LED Controller: Drives LEDs in series strings (capable of 4 strings in parallel).
- Buck Converter: Provides a regulated output voltage.

2. Test Conditions & Setup

️· Standard Test Configuration:
- VIN: 16V (Nominal)
- LEDs: 10 white LEDs in series per string
- Strings: 4 strings in parallel
- Current per String: 120mA (Nominal)
- Temperature: 25°C (TA)
️· Dimming Options: PWM and Analog dimming are tested.
️· Load conditions: Output current varied from 0A to 2A in various tests.

3. Key Test Results

️· Steady-State Performance: (Waveforms shown) Demonstrates stable operation under load.
️· Analog Dimming: Verified functionality.
️· PWM Dimming: Verified functionality.
️· Transient Response: Demonstrated the response time for changes in output current.
️· Output Ripple: Evaluated the ripple voltage on the output, both at 0A and 2A.
️· Power-Up/Power-Down Behavior: Showed the performance during power transitions.
️· Short Circuit Handling: Demonstrates the circuit's behavior under fault conditions (shorted inductor, shorted diode, shorted LED string).
️· Open String Handling: Showed the circuit's behavior when one LED string is disconnected.

4. Quick Start Guide – Key Steps

1. Connect Load: Connect the LED load (10 LEDs in series, 4 strings) to the LED/LED1-4 pins. Connect load to Vout and GND for the Buck converter.
2. Connect Power: Connect a power supply (8V-24V) to VIN and GND.
3. Enable and Dimming: Set PWM and A-DIM to high. Enable the Boost Controller by setting EN/BL high.
4. Dimming Options:
- PWM: Apply a PWM signal (200Hz-2kHz) to the PWM pin.
- Analog: Apply a DC voltage (0.4V-1.5V) or PWM signal to the A-DIM pin.

5. Board Layout

️· Top and Bottom Layer diagrams are provided (Figure 1 & 2) showing the component placement and trace routing. These are crucial for replicating the circuit.

6. Important Notes / Notice

️· Disclaimer: MPS (Monolithic Power Systems) disclaims responsibility for any infringement of third-party intellectual property when using the EVB.
️· Changes Without Notice: Document information is subject to change.