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< 20mW standby power
The iW1677 is a high performance AC/DC controller designed to drive a low-cost BJT power switch in peak current mode PWM flyback power supplies up to 5W. Ideal for power adapters for smartphones, the iW1677 integrates Dialog’s PrimAccurate™ digital primary-side control, eliminating the need for the secondary-side optocoupler, reducing component count and solution cost.
The iW1677 integrates an active start-up circuit that allows for fast turn-on without impacting operating current consumption. The device easily meets the US DoE’s external power supply standard and the EU’s Code of Conduct, version 5, tier 2 standard, with no-load power consumption less than 20mW. Additional features include Dialog's proprietary EZ-EMI™ technology, quasi-resonant control for optimal efficiency at heavy loads, cable and connector voltage drop compensation options, full protection from fault conditions and tiny packaging.
Features
Meets Proposed Mandatory Federal Efficiency Standards for External Power Supplies1
Intrinsically Low Noise Solution - No Audible Noise Over Entire Operating Range
Easily Meets Energy-Star® AC/DC Power Supply Efficiency Specs (Rev 2.0)
- Less than 20mW No-Load Power Consumption
Low 1.7uA Start-Up Current
Active Start-Up Circuit to Reduce Turn-on Time
72kHz PWM Switching Frequency
Voltage Offset Compensation for Voltage Loss in Cables and Connectors (4 Options)
PrimAccurate™ - Primary-Side Control, No Opto-Coupler Needed
Quasi-resonant Control for Optimal Efficiency
EZ-EMI™ Design to Easily Meet Global EMI Specifications
Fast Dynamic Load Regulation
Fully Protected from Fault Conditions
- Over-Temperature Protection
- Output Over-Voltage and Over-Current
- Input Undervoltage Protection
- Sense-Resistor Short Circuit Protection
Applications
Power Adapters for Portable Electronics
Consumer Electronics Power Supplies
Linear AC/DC Power Supply Replacement
Block Diagrams
Typical applications diagram
Functional block dirgram
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