IW1710-01

The iW1710 is a high performance AC/DC power supply controller which uses digital control technology to build peak current mode PWM flyback power suppliers. The device operates in quasi- resonant mode at heavy load to provide high efficiency along with a number of key built- in protection features while minimizing the external component count, simplifying EMI design and lowering the total bill of material cost. The iW1710 removes the need for secondary feedback circuitry while achieving excellent line and load regulation. It also eliminates the need for loop compensation components while maintaining stability over all operating conditions. Pulse- by- pulse waveform analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load response. The built- in current limit function enables optimized transformer design in universal off- line applications over a wide input voltage range. The ultra- low operating current at light load ensures that the iW1710 is ideal for applications targeting the newest regulatory standards for average efficiency and standby power.

Applications

• Cable/DSL modems
• WLAN access points
• VOIP gateways

Key features

• Primary-side feedback eliminates optoisolators and simplifies design
• Quasi-resonant operation for highest overall efficiency
• EZ-EMI™ design to easily meet global EMI standards
• Up to 130kHz switching frequency enables small adapter size
• Very tight output voltage regulation
• No external compensation components required
• Complies with CEC/EPA no-load power consumption and average efficiency regulations
• Built-in output constant-current control with primary-side feedback
• Low start-up current (10μA typical)
• Built-in soft start
• Built-in short circuit protection and output overvoltage protection
• Optional AC line under/overvoltage protection
• PFM operation at light load
• Current sense resistor short protection
• Overtemperature Protection