iW1679 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller 1 Description The iW1679 is a high performance AC/DC power supply controller that uses digital control technology to build peak current mode PWM flyback power supplies. The device directly drives a power BJT and operates in quasi-resonant mode to provide high efficiency and key built-in protection features, while minimizing the external component count, simplifying EMI design, and lowering the total bill of material cost. The iW1679 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 for both one-time and repetitive load transients. The built-in power limit function enables optimized transformer design for a wide input voltage range. Dialog’s innovative proprietary technology ensures that power supplies built with the iW1679 can achieve both the highest average efficiency and less than 30mW no-load power consumption, and have fast dynamic load response in typical 5V/2A applications. The active start-up scheme enables the shortest possible start-up time without sacrificing no-load power loss. 2 Features ●● No-load power consumption < 20mW at 230VAC with typical application circuit (5-star rating) ●● Optimized 72kHz maximum PWM switching frequency achieves best size and efficiency ●● Optimized for 5V/2A AC/DC adapters/chargers with < 30mW no-load power consumption at 230VAC and fast dynamic load response for both one-time and repetitive load transients ●● Adaptive multi-mode PWM/PFM control improves efficiency ●● Direct drive of low-cost BJT power switch ●● Very tight constant voltage and constant current regulation over entire operating range ●● PrimAccurate primary-side feedback eliminates opto-isolators and simplifies design TM ●● EZ-EMI® design enhances manufacturability ●● Intrinsically low common mode noise ●● Quasi-resonant operation for highest overall efficiency ●● Dynamic base current control ●● No external loop compensation components required ●● Complies with EPA 2.0/CoC Ver5/DoE energyefficiency specifications with ample margin ●● Built-in protections for output short-circuit, output low impedance, and output overvoltage ●● Built-in over-temperature protection (OTP) ●● No audible noise over entire operating range 3 Applications ●● Compact AC/DC adapters/chargers for media tablets and smart phones ●● AC/DC adapters for consumer electronics Datasheet www.dialog-semiconductor.com Rev. 1.1 1 of 6 24-January-2017 © 2017 Dialog Semiconductor iW1679 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller L + + VOUT GND N U1 iW1679 1 GND VCC 8 2 GND ASU 7 3 GND VSENSE 6 4 OUTPUT ISENSE 5 Figure 3.1 : iW1679 Typical Application Circuit (Achieving < 30mW No-load Power Consumption. Using Depletion Mode NFET as Active Start-up Device) L + + VOUT GND N U1 iW1679 1 GND VCC 8 2 GND ASU 7 3 GND VSENSE 6 4 OUTPUT ISENSE 5 Figure 3.2: iW1679 Typical Application Circuit (Achieving < 50mW No-load Power Consumption. Alternative Circuit without Using Active Start-up Device) Datasheet www.dialog-semiconductor.com Rev. 1.1 2 of 6 24-January-2017 © 2017 Dialog Semiconductor iW1679 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller 4 Pinout Description iW1679 1 GND VCC 8 2 GND ASU 7 3 GND VSENSE 6 4 OUTPUT ISENSE 5 Figure 4.1 : 8-Lead SOIC Package Pin # Name Type 1 GND Ground Ground. 2 GND Ground Ground. 3 GND Ground Ground. 4 OUTPUT Output Base drive for BJT. 5 ISENSE Analog Input 6 VSENSE Analog Input Auxiliary voltage sense. It is used for primary regulation. 7 ASU Output 8 VCC Power Input Datasheet www.dialog-semiconductor.com Pin Description Primary current sense. It is used for cycle-by-cycle peak current control and limit. Control signal for active start-up device (BJT or Depletion NFET). IC power supply. Rev. 1.1 3 of 6 24-January-2017 © 2017 Dialog Semiconductor iW1679 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller 5 Absolute Maximum Ratings Absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. For maximum safe operating conditions, refer to Electrical Characteristics in Section 6. Parameter Symbol Value Units DC supply voltage range (pin 8, ICC = 20mA max) VCC -0.3 to 25.0 V Continuous DC supply current at VCC pin (VCC = 15V) ICC 25 mA ASU output (pin 7) -0.3 to 19.0 V Output (pin 4) -0.3 to 4.0 V VSENSE input (pin 6, IVsense ≤ 10mA) -0.7 to 4.0 V ISENSE input (pin 5) -0.3 to 4.0 V Maximum junction temperature TJMAX 150 °C Operating junction temperature TJOPT -40 to 150 °C Storage temperature TSTG -65 to 150 °C Thermal resistance junction-to-ambient θJA 135 °C/W ±2,000 V ±100 mA ESD rating per JEDEC JESD22-A114 Latch-up test per JESD78D Datasheet www.dialog-semiconductor.com Rev. 1.1 4 of 6 24-January-2017 © 2017 Dialog Semiconductor iW1679 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller 6 Physical Dimensions 8-Lead Small Outline (SOIC) Package E 8 5 1 4 H e h x 45° A1 COPLANARITY 0.10 (0.004) A2 B MIN MAX MIN MAX A 0.053 0.069 1.35 1.75 A1 0.0040 0.010 0.10 0.25 A2 0.049 0.059 1.25 1.50 B 0.014 0.019 0.35 0.49 C 0.007 0.010 0.19 0.25 D 0.189 0.197 4.80 5.00 E 0.150 0.157 3.80 4.00 e A SEATING PLANE Inches Symbol D L α C Millimeters 0.050 BSC 1.27 BSC H 0.228 0.244 5.80 6.20 h 0.10 0.020 0.25 0.50 L 0.016 0.049 0.4 1.25 α 0° 8° Compliant to JEDEC Standard MS12F Controlling dimensions are in inches; millimeter dimensions are for reference only This product is RoHS compliant and Halide free. Soldering Temperature Resistance: [a] Package is IPC/JEDEC Std 020D moisture sensitivity level 1 [b] Package exceeds JEDEC Std No. 22-A111 for solder immersion resistance; package can withstand 10 s immersion < 260˚C Dimension D does not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs shall not exceed 0.15 mm per end. Dimension E1 does not include interlead flash or protrusion. Interlead flash or protrusion shall not exceed 0.25 mm per side. The package top may be smaller than the package bottom. Dimensions D and E1 are determined at the outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 7 Ordering Information Part Number Options Package Description iW1679-35 Cable Comp = 150mV, CC shutdown voltage = 3V SOIC-8 Tape & Reel1 Note 1: Tape & Reel packing quantity is 2,500/reel. Minimum ordering quantity is 2,500. Datasheet www.dialog-semiconductor.com Rev. 1.1 5 of 6 24-January-2017 © 2017 Dialog Semiconductor iW1679 Off-Line Digital Green-Mode Quasi-Resonant PWM Controller Disclaimer Information in this document is believed to be accurate and reliable. However, Dialog Semiconductor does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information. Dialog Semiconductor furthermore takes no responsibility whatsoever for the content in this document if provided by any information source outside of Dialog Semiconductor. Dialog Semiconductor reserves the right to change without notice the information published in this document, including without limitation the specification and the design of the related semiconductor products, software and applications. Applications, software, and semiconductor products described in this document are for illustrative purposes only. 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All other product or service names are the property of their respective owners. © 2017 Dialog Semiconductor. All rights reserved. RoHS Compliance Dialog Semiconductor’s suppliers certify that its products are in compliance with the requirements of Directive 2011/65/EU of the European Parliament on the restriction of the use of certain hazardous substances in electrical and electronic equipment. RoHS certificates from our suppliers are available on request. Contacting Dialog Semiconductor United Kingdom (Headquarters) Dialog Semiconductor (UK) LTD Phone: +44 1793 757700 North America Dialog Semiconductor Inc. Phone: +1 408 845 8500 Singapore Dialog Semiconductor Singapore Phone: +65 64 8499 29 China (Shenzhen) Dialog Semiconductor China Phone: +86 755 2981 3669 Germany Dialog Semiconductor GmbH Phone: +49 7021 805-0 Japan Dialog Semiconductor K. K. 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