Description:The PS9851-1, PS9851-2 are optically coupled isolators containing GaAlAs LED on the input side and a CMOS output ICon the output side. They are high common mode transient immunity (CMR), high-speed CMOS output type photocouplers designed for high-speed logic interface circuits.
Renesas provides a recommended PCB layout guide in their application note (APN) document, which includes thermal design considerations, such as thermal vias, copper pours, and component placement. It's essential to follow these guidelines to ensure optimal thermal performance and prevent overheating.
The PS9851-1-AX has an internal overvoltage protection (OVP) circuit, but it's recommended to add external OVP components, such as a voltage supervisor or a dedicated OVP IC, to provide additional protection against voltage surges or spikes. The specific implementation will depend on the system requirements and voltage rails.
The input capacitor selection depends on the input voltage, output current, and ripple requirements. Renesas recommends using a low-ESR capacitor with a value between 10uF to 22uF, and a voltage rating of at least 1.5 times the input voltage. The capacitor should be placed as close as possible to the VIN pin to minimize noise and ripple.
To ensure EMC compliance, follow Renesas' guidelines for PCB layout, component selection, and shielding. Use a metal shield or a shielded enclosure to reduce EMI radiation. Additionally, implement filtering and decoupling techniques, such as adding ferrite beads or common-mode chokes, to minimize conducted emissions.
The PS9851-1-AX has an operating temperature range of -40°C to +125°C, but the maximum junction temperature (TJ) should not exceed 150°C. It's essential to ensure proper thermal design and heat dissipation to prevent overheating and ensure reliable operation.
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PS9851-1-AX Overview
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