iW1818 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller Integrated with Power BJT 1 Description The iW1818 is a high performance AC/DC power supply control device that uses digital control technology to build peak current mode PWM flyback power supplies. The device includes an internal power BJT, operates in quasi-resonant mode, and includes key built-in protection features. This combination of features and integration simplifies design, improves efficiency , reduces EMI and lowers the bill of material cost. The iW1818 features a distinctive soft-start scheme, which allows for fast and yet smooth start-up with both small and large capacitive loads. It removes the need for a secondary feedback circuit while achieving excellent line and load regulation. It also eliminates the need for loop compensation components while maintaining stability over all operating conditions. The pulse-by-pulse waveform analysis allows for fast dynamic load response. The built-in power limit function enables optimized transformer design for a wide input voltage range. Dialogs innovative proprietary technology ensures that power supplies built with the iW1818 can achieve both the highest average efficiency and less than 50mW no-load power consumption they also have fast yet smooth start-up 2 Features Targeted at 10W to 12W AC/DC applications with Intrinsically low common mode noise <50mW no-load power consumption at 230V and AC Optimized 72kHz maximum PWM switching fast dynamic response frequency achieves best size and efficiency TM AccuSwitch technology with integrated 800V Adaptive multi-mode PWM/PFM control improves bipolar junction transistor (BJT) efficiency Adaptively controlled soft-start enables fast and Quasi-resonant operation for highest overall smooth start-up for a wide range of capacitive loads efficiency (from 330F to 6,000F) with output voltage of 5V to Dynamic base current control 12V and above No external loop compensation components required Very tight constant voltage and constant current regulation over entire operating range Built-in single-point protections against output short- TM circuit, output low impedance, and output overvoltage PrimAccurate primary-side feedback eliminates opto-isolator and simplifies design Built-in over-temperature protection (OTP) EZ-EMI design enhances manufacturability No audible noise over entire operating range 3 Applications Network power adapters for ADSL, wireless access points and routers AC/DC adaptor for set top box AC/DC power supplies for home appliances 15-April-2016 Product Summary Rev. 1.0 www.dialog-semiconductor.com 1 of 6 2016 Dialog SemiconductoriW1818 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller Integrated with Power BJT L V OUT + + GND N U1 iW1818 1 8 E C 7 2 C I SENSE 3 GND 4 V V 5 SENSE CC Figure 3.1 : iW1818 Typical Application Circuit WARNING: The iW1818 is intended for high voltage AC/DC offline applications. Contact with live high voltage offline circuits or improper use of components may cause lethal or life threatening injuries or property damage. Only qualified professionals with safety training and proper precaution should operate with high voltage offline circuits. iW1818 Output Power Table at Universal Input (85V 264V ) AC AC 1 Condition Open Frame 2 10.0 Output Power (W) Notes: Note 1. Maximum practical continuous output power measured at open frame ambient temperature of 50C and device package/ pin temperature of 90C while minimum bulk capacitor voltage is kept above 90V and no special heatsinking is used (test unit is placed in a non-ventilated environment). Note 2. The output power can vary depending on the power supply system designs and operating conditions. 15-April-2016 Product Summary Rev. 1.0 www.dialog-semiconductor.com 2 of 6 2016 Dialog Semiconductor