1 of 6 1 description the IW1679 is a high performance ac/dc power supply controller that uses digital control technology to build peak current mode pwm fyback power supplies . the device directly drives a power bjt and operates in quasi-resonant mode to provide high effciency 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. dialogs innovative proprietary technology ensures that power supplies built with the IW1679 can achieve both the highest average effciency 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 sacrifcing no-load power loss. optimized 72khz maximum pwm switching frequency achieves best size and effciency adaptive multi-mode pwm/pfm control improves effciency quasi-resonant operation for highest overall effciency dynamic base current control no external loop compensation components required complies with epa 2.0/coc ver5/doe energy- effciency specifcations 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 2 features no-load power consumption < 20mw at 230v ac with typical application circuit (5-star rating) optimized for 5v/2a ac/dc adapters/chargers with < 30mw no-load power consumption at 230v ac and fast dynamic load response for both one-time and repetitive load transients direct drive of low-cost bjt power switch very tight constant voltage and constant current regulation over entire operating range primaccurate tm primary-side feedback eliminates opto-isolators and simplifes design ez-emi ? design enhances manufacturability intrinsically low common mode noise 3 applications compact ac/dc adapters/chargers for media tablets and smart phones ac/dc adapters for consumer electronics IW1679 off-line digital green-mode quasi-resonant pwm controller rev. 1.1 datasheet www.dialog-semiconductor.com ? 2017 dialog semiconductor 24-january-2017
2 of 6 figure 3.1 : IW1679 typical application circuit (achieving < 30mw no-load power consumption. using depletion mode nfet as active start-up device) l + u1 IW1679 1 7 3 8 6 2 n 4 5 gnd output v cc asu v sense i sense v out gnd + gnd gnd l + u1 IW1679 1 7 3 8 6 2 n 4 5 gnd gnd gnd output v cc asu v sense i sense v out gnd + figure 3.2: IW1679 typical application circuit (achieving < 50mw no-load power consumption. alternative circuit without using active start-up device) IW1679 off-line digital green-mode quasi-resonant pwm controller rev. 1.1 datasheet www.dialog-semiconductor.com ? 2017 dialog semiconductor 24-january-2017
3 of 6 pin # name type pin description 1 gnd ground ground. 2 gnd ground ground. 3 gnd ground ground. 4 output output base drive for bjt. 5 i sense analog input primary current sense. it is used for cycle-by-cycle peak current control and limit. 6 v sense analog input auxiliary voltage sense. it is used for primary regulation. 7 asu output control signal for active start-up device (bjt or depletion nfet). 8 v cc power input ic power supply. 4 pinout description IW1679 gnd gnd gnd output v cc asu v sense i sense 1 2 3 8 7 6 4 5 figure 4.1 : 8-lead soic package IW1679 off-line digital green-mode quasi-resonant pwm controller rev. 1.1 datasheet www.dialog-semiconductor.com ? 2017 dialog semiconductor 24-january-2017
4 of 6 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, i cc = 20ma max) v cc -0.3 to 25.0 v continuous dc supply current at v cc pin (v cc = 15v) i cc 25 ma asu output (pin 7) -0.3 to 19.0 v output (pin 4) -0.3 to 4.0 v v sense input (pin 6, i vsense 10ma) -0.7 to 4.0 v i sense input (pin 5) -0.3 to 4.0 v maximum junction temperature t jmax 150 c operating junction temperature t jopt -40 to 150 c storage temperature t stg -65 to 150 c thermal resistance junction-to-ambient ja 135 c/w esd rating per jedec jesd22-a114 2,000 v latch-up test per jesd78d 100 ma IW1679 off-line digital green-mode quasi-resonant pwm controller rev. 1.1 datasheet www.dialog-semiconductor.com ? 2017 dialog semiconductor 24-january-2017
5 of 6 6 physical dimensions 7 ordering information part number options package description IW1679-35 cable comp = 150mv, cc shutdown voltage = 3v soic-8 tape & reel 1 note 1: tape & reel packing quantity is 2,500/reel. minimum ordering quantity is 2,500. 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. 8-lead small outline (soic) package coplanarity 0.10 (0.004) 8 5 4 1 seating plane a1 e h b d e a a2 c l h x 45 inches symbol millimeters min 0.0040 a1 max min max 0.010 0.10 0.25 0.053 a 0.069 1.35 1.75 0.014 b 0.019 0.35 0.49 0.007 c 0.010 0.19 0.25 0.189 d 0.197 4.80 5.00 0.150 e 0.157 3.80 4.00 0.050 bsc e 1.27 bsc 0.228 h 0.244 5.80 6.20 0.10 h 0.020 0.25 0.50 0.016 l 0.049 0.4 1.25 0 8 0.049 a2 0.059 1.25 1.50 IW1679 off-line digital green-mode quasi-resonant pwm controller rev. 1.1 datasheet www.dialog-semiconductor.com ? 2017 dialog semiconductor 24-january-2017
6 of 6 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 specifcation 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 . dialog semiconductor makes no representation or warranty that such applications, software and semiconductor products will be suitable for the specifed use without further testing or modifcation. unless otherwise agreed in writing, such testing or modifcation is the sole responsibility of the customer and dialog semiconductor excludes all liability in this respect. customer notes that nothing in this document may be construed as a license for customer to use the dialog semiconductor products, software and applications referred to in this document. such license must be separately sought by customer with dialog semiconductor. all use of dialog semiconductor products, software and applications referred to in this document are subject to dialog semiconductors standard terms and conditions of sale , available on the company website ( www.dialog-semiconductor.com ) unless otherwise stated. dialog and the dialog logo are trademarks of dialog semiconductor plc or its subsidiaries. all other product or service names are the property of their respective owners. ? 2017 dialog semiconductor. all rights reserved. rohs compliance dialog semiconductors 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 certifcates from our suppliers are available on request. IW1679 rev. 1.1 datasheet www.dialog-semiconductor.com 24-january-2017 ? 2017 dialog semiconductor contacting dialog semiconductor united kingdom (headquarters) dialog semiconductor (uk) ltd phone: +44 1793 757700 germany dialog semiconductor gmbh phone: +49 7021 805-0 the netherlands dialog semiconductor b.v. phone: +31 73 640 8822 email info_pcbg@diasemi.com north america dialog semiconductor inc. phone: +1 408 845 8500 japan dialog semiconductor k. k. phone: +81 3 5425 4567 taiwan dialog semiconductor taiwan phone: +886 281 786 222 web site: www.dialog-semiconductor.com singapore dialog semiconductor singapore phone: +65 64 8499 29 hong kong dialog semiconductor hong kong phone: +852 3769 5200 korea dialog semiconductor korea phone: +82 2 3469 8200 china (shenzhen) dialog semiconductor china phone: +86 755 2981 3669 china (shanghai) dialog semiconductor china phone: +86 21 5424 9058 off-line digital green-mode quasi-resonant pwm controller
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