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| README.md |
README.mdMulti-Output DC-DC Power Supply
Overview
This repository contains the technical documentation for a multi-output DC-DC power supply system designed for vehicular applications. The system efficiently converts a noisy input voltage (9-14V DC) into regulated output voltages of 12V, 15V, and 24V, while incorporating essential protection features.
Table of Contents
- Introduction
- System Requirements
- Design Overview
- Detailed Design Analysis
- Protection Features
- Performance Specifications
- Testing and Validation
- Assembly Guidelines
Introduction
Purpose
The purpose of this document is to detail the design and implementation of a multi-output DC-DC power supply system.
Scope
- Input voltage conditioning
- DC-DC conversion
- Protection circuitry
- Thermal management
- EMI/EMC considerations
References
- LT1613 Datasheet
- LT1930 Datasheet
- Vehicle electrical system specifications
- EMC standards for automotive applications
System Requirements
Electrical Specifications
Input Requirements
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Input Voltage | 9 | 12 | 14 | V |
| Input Current | - | - | 2 | A |
| Surge Voltage | - | - | 40 | V |
Output Requirements
| Output | Voltage | Current (Nominal) | Current (Peak) | Ripple |
|---|---|---|---|---|
| OUT1 | 12V | 100mA | 300mA | ± 1V |
| OUT2 | 15V | 20mA | 30mA | ± 0.5V |
| OUT3 | 24V | 20mA | 30mA | 0.5V |
Environmental Requirements
- Operating Temperature: 0°C to 60°C
- Storage Temperature: -40°C to 85°C
- Humidity: Up to 95% non-condensing
- Vibration: As per automotive standards
Protection Requirements
- Reverse polarity protection
- Output overcurrent protection
- EMI/RFI filtering
- Thermal protection
- Output isolation between channels
Design Overview
Block Diagram
- [Battery Input] → [Input Protection] → [EMI Filter] → [DC-DC Converters] → [Output Protection] → [Loads]
Major Components
| Component | Part Number | Quantity | Function |
|---|---|---|---|
| DC-DC Controller | LT1613 | 2 | 12V & 15V conversion |
| DC-DC Controller | LT1930 | 1 | 24V conversion |
| MOSFET | FDR840P | 1 | Reverse protection |
| Schottky Diode | 1N5819 | 3 | Rectification |
| EMI Inductor | 18µH | 1 | Input filtering |
| Power Inductors | 10µH | 3 | DC-DC conversion |
Detailed Design Analysis
- Input Stage Design: Includes EMI filtering and reverse polarity protection.
- DC-DC Converter Stages: Feedback network calculations for each output voltage.
Protection Features
- Input and output protection mechanisms, including thermal shutdown and soft-start capabilities.
Performance Specifications
- Efficiency: >80%
- Line Regulation: <1%
- Load Regulation: <2%
Testing and Validation
Test Procedures
- Functional Tests
- Protection Tests
- Environmental Tests
Test Equipment Required
- DC Power Supply (0-30V, 0-5A)
- Electronic Load
- Oscilloscope
- Digital Multimeter
- Thermal Camera
Assembly Guidelines
PCB Layout Requirements
- Minimum trace width: 40 mil for power
- Ground plane coverage: >80%
Assembly Notes
- Critical component placement and thermal considerations.