Overview
Description
The iW1677 is a high-performance AC/DC controller designed to drive a low-cost bipolar junction transistor (BJT) power switch in peak current mode PWM flyback power supplies up to 5W. Ideal for power adapters for smartphones, the iW1677 integrates Renesas' PrimAccurate™ digital primary-side control, eliminating the need for the secondary-side optocoupler, and 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 a no-load power consumption of less than 20mW. Additional features include Renesas' 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 supplies
- Intrinsically low noise solution - No audible noise over the entire operating range
- Easily meets Energy Star® AC/DC power supply efficiency specs (Rev. 2.0)
- Less than 20mW no-load power consumption
- Low 1.7µA 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 optocoupler 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 overvoltage and overcurrent
- Input undervoltage protection
- Sense-resistor short circuit protection
Comparison
Applications
- Power adapters for portable electronics
- Consumer electronics power supplies
- Linear AC/DC power supply replacement
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 1003 KB | |
| Other | ZIP 3.02 MB | |
| White Paper | PDF 597 KB | |
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Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| SOT23-6L | Tape & Reel | 1 | Get Samples, | |
| SOT23-6L | Tape & Reel | 1 | Get Samples, | |
| SOT23-6L | Tape & Reel | 1 | Get Samples, | |
| SOT23-6L | Tape & Reel | 1 | Get Samples, |
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