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
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.
Parameters
| Attributes | Value |
|---|---|
| Topology Characteristic | PSR Flyback |
| Control Mode | Primary-Side Regulation Peak Current Mode DCM |
| UVLO Rising (V) | 11 |
| UVLO Falling (V) | 4 |
| VBIAS (Max) (V) | 16 |
| PWMs (#) | 1 |
| Output Power Max (W) | 10 |
| Switching Frequency (KHz) | 72 - 72 |
| No Load Power (mW) | 5 |
| Controller / Integrated | Controller |
| Advanced Features | EZ-EMI, PrimAccurate |
| Temp. Range (°C) | -40 to +125°C |
| Qualification Level | Standard |
Package Options
| Pkg. Type | Lead Count (#) | Pitch (mm) |
|---|---|---|
| SOT23-6L | 6 | 0.95 |
Application Block Diagrams
 | Bedside Monitor Power Supply Reliable power supply design with battery backup and isolated supplies for bedside monitoring systems. |
Additional Applications
- Power adapters for portable electronics
- Consumer electronics power supplies
- Linear AC/DC power supply replacement
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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
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