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Digital PWM Controller Offers Peak Power Mode, Eliminating Need to Oversize Power Supply
Off-line digital quasi-resonant PWM controller with peak power operation
The iW1770 offers a compact solution for power supplies that need to provide short bursts of output power up to 60W, without oversizing the power system board components and cost. With an average output up to 40W, the iW1770 adds a second, higher peak current limit, allowing power supplies to provide a momentary peak current pulse from the output without entering constant current mode. This optimizes adapter cost and size by enabling a much higher peak output power, while maintaining the same external components used for the lower, nominal system output power.
The iW1770 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 50mW while complying with active mode efficiency requirements. Additional features include fast dynamic load response (DLR), and a full set of protection features including output over-current, over-voltage and short-circuit protection.
The iW1770 also incorporates Dialog’s SmartDefender™ smart hiccup technology to help address soft short circuits in cables and connectors.
40W average, 60W peak output power for AC/DC power supplies
- No increase in component size to accommodate peak output power
Meets DoE External Power Supply and EU Code of Conduct, Version 5, Tier 2 Standards
- Less than 50mW No-Load Power Consumption
Active Start-Up - Reduces Turn-on Time without Impacting No-load Power Consumption
High Nominal Output Power : 15W to 40W
Selectable Cable Drop Compensation: 0mV, 75mV, 150mV, 300mV, 450mV
- Selectable via single resistor
PrimAccurateTM- Primary-Side Control, No Optocoupler Needed
Adaptive Multi-Mode PWM/PFM Control for Optimal Efficiency Across Load Range
No Audible Noise Over Entire Operating Range
EZ-EMITM Design to Easily Meet Global EMI Specifications
Fast Dynamic Load Response
SmartDefender™ Smart Hiccup Technology
- Helps Address Soft-Shorts in Cables, Connectors without Latching Off
- Helps Protect Cables and Connectors from Excessive Heat and Damage by Reducing Average Power During Short Circuit by at Least 50%
Fully Protected from Fault Conditions
- Over-Voltage/Over-Temperature Protection
- Output Short Circuit
- Sense-Resistor Short Circuit Protection
Typical Applications Diagram
Functional Block Diagram
Dialog’s DiaSIM simulation models and tools enable simulation and validation of AC/DC power supplies using highly accurate models for selected products. All models and application circuits are available for download from the support website.
Important note: Dialog's DiaSIM models are only compatible with the 32-bit version of NL5.Download
Important note: Dialog's DiaSIM models are only compatible with the 32-bit version of NL5.