Overview
Description
The iW1700 is a high-performance AC/DC controller designed to drive an external power bipolar junction transistor (BJT) for peak current mode PWM flyback power supplies. The iW1700 is a zero no-load power product, having less than 5mW of power consumption at no load, easily meeting the US DoE’s external power supply standard and the EU’s Code of Conduct, Version 5, Tier 2, external power supply standard. The virtually zero no-load power consumption makes it ideal for adapters in portable electronics and power supplies for consumer electronics.
As a PrimAccurate™ controller, which uses primary-side control algorithms, the iW1700 does not need any direct secondary-side feedback components, eliminating the need for optocouplers, and reducing component count and solution cost. 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
- Zero no-load power consumption - Easily meets DoE external power supply and EU Code of Conduct, Version 5, Tier 2 standards
- Less than 5mW at no-load
- Meets proposed mandatory federal efficiency standards for external power supplies
- 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
- Intrinsically low noise solution - No audible noise over the entire operating range
- 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
Documentation
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| Type | Title | Date |
| Datasheet | PDF 834 KB | |
| White Paper | PDF 854 KB 日本語 , 简体中文 | |
| Other | ZIP 1.87 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 the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
Support
Support Communities
Support Communities
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iw1700 design
I'm considering using your iW1700 for a PSR flyback converter with the below mentioned specs. Do you have any tools or application notes describing the design and necessary calculations? I have a lot of electronic experience but unfortunately not in this kind of circuit. Can you confirm if this ...
Nov 29, 2024