CAP300DG

Specialized ICS Overview

The CAP300DG is a zero-loss automatic X capacitor rapid discharge IC from the CAPZero™-3 series, designed for AC-DC converters. It blocks current flow in safety discharge resistors during AC operation to reduce power loss below 5 mW at 230 VAC. Upon AC disconnection, it automatically connects external resistors to discharge X capacitors (100 nF to 6 mF) to less than 34 V. The device features a 1000 V breakdown voltage, self-supplied operation without external bias, and high surge immunity. It is housed in an SO-8 package with over 4 mm creepage distance.

Specialized ICS Feature Summary

• Blocks discharge resistor current during AC operation to achieve <5 mW standby power consumption
• Automatically discharges X capacitors to <34 V upon AC removal to meet safety regulations
• Supports X capacitance values from 100 nF up to 6 mF with total series resistance of 54 kΩ minimum
• Self-supplied operation requiring no external bias or ground connection

Specialized ICS Applications

• All AC-DC converters with X capacitors ranging from 100 nF to 6 mF
• Appliances requiring ErP Lot 6 compliance
• Adapters requiring ultra-low no-load consumption
• Lossless generation of zero crossing signal

Specialized ICS Procurement Notes

Verify the ordering suffix 'TL' indicates Tape & Reel packaging containing 2,500 pieces. Confirm the 'G' suffix denotes Green material, which is halogen-free and RoHS compliant. Ensure the D package identifier corresponds to the Plastic SO-8 form factor. Cross-reference the specific part number against the manufacturer's latest datasheet revision E dated November 2021 for accurate parameter validation.

Specialized ICS Selection Notes

Select the CAP300DG based on the system's differential surge voltage specifications and MOV placement. If the MOV is placed directly across the X capacitor, the device withstands surges of 3 kV or higher. For other MOV placements, the maximum surge specification is limited to 1.5 kV. Ensure the total external resistance value is equal to or greater than 54 kΩ to achieve the necessary RC time constant for safe discharge.

Specialized ICS Part Context

The CAP300DG belongs to the CAPZero™-3 family of specialized PMICs focused on energy efficiency. It addresses standby power requirements by eliminating continuous current flow through discharge resistors during normal operation. This component simplifies EMI filter design by allowing larger X capacitors without increasing power loss, supporting compact converter designs that must comply with strict energy conservation standards.

Specialized ICS Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.