ADI公司的ADuM4471是一款內(nèi)嵌MOSFET驅(qū)動器和校準(zhǔn)器的四通道數(shù)字光電隔離DC-DC功率控制器，基于ADI先進(jìn)iCoupler®技術(shù)，該控制器內(nèi)部集成次邊PWM光電隔離反饋補(bǔ)償回路。有效減少了外部光電隔離電路和補(bǔ)償回路的元器件，為實現(xiàn)小型化設(shè)計提供了基礎(chǔ)。該控制器輸入電壓為5V或3V，輸出電壓范圍為：3.3V-24V。單路輸出功率可以達(dá)到2.5Ｗ。四通道可分別靈活獨立配置，以滿足用戶不同的應(yīng)用需要。本文介紹了DADuM4471芯片的主要特性、方框圖、應(yīng)用方向。評估板EVAL-ADuM5211EBZ的主要特性、電路圖、材料清單和PCB元件布局圖。
The ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM44741 are quad-channel, digital isolators with a regulated dc-to-dc isolated power supply controller and an internal MOSFET driver. The dc-to-dc controller has an internal isolated PWM feedback from the secondary side, based on the iCoupler? chip scale transformer technology and complete loop compensation. This eliminates the need to use an optocoupler for feedback and compensates the loop for stability.
The ADuM447x isolators provide a more stable output voltage and higher efficiency compared to unregulated isolated dc- to-dc power supplies. The fully integrated feedback and loop compensation in a wide-body SOIC package provide a smaller form factor and 8.3 mm creepage distance solution.
The regulated feedback provides a relatively flat efficiency curve over the full output power range. The ADuM447x enable a dc-to-dc converter with a 3.3 V to 24 V isolated output voltage range from either a 5.0 V or a 3.3 V input voltage, with an output power of up to 2.5 W. The ADuM447x isolators provide four independent isolation channels in a variety of channel configurations and data rates.
ADuM4471主要特性：
Isolated PWM feedback with built in compensation
Primary side transformer driver for up to 2.5 W output power with 5 V input voltage
Regulated adjustable output: 3.3 V to 24 V
Up to 80% efficiency
Quad dc-to-25 Mbps (NRZ) signal isolation channels
200 kHz to 1 MHz adjustable oscillator
Soft start function at power-up
Pulse-by-pulse overcurrent protection
Thermal shutdown
5000 V rms isolation
High common-mode transient immunity: >25 kV/μs
20-lead SOIC package with 8.3 mm creepage
High temperature operation: 105°C
ADuM4471應(yīng)用：
Power supply start-up bias and gate drives
Isolated sensor interfaces
Process controls
RS-232/RS-422/RS-485 transceivers
圖1. ADuM4471方框圖
EVAL-ADuM4471EBZ 主要特性：
ADuM447x circuits, including 5 kV rms isolated dc-to-dc converters
Single supply (default)
5 V input to 5 V output (regulated)
Reconfigurable to 5 V input to 3.3 V output or 3.3 V input to 3.3 V output
Double supply
5 V input to 15 V output (regulated) and 7.5 V output (unregulated)
Reconfigurable to 5 V input to 12 V output (regulated) and 6 V output (unregulated)
Footprints for Coilcraft, Inc., and Halo Electronics, Inc., transformer options
Multiple switching frequency options
EVAL-ADuM4471EBZ電路圖：
圖2. EVAL-ADuM4471EBZ電路圖
EVAL-ADuM4471EBZ材料清單：
PCB元件布局圖：
