1 of 6 1 description the IW1781 is a high performance ac/dc power supply controller for rapid charge that uses digital control technology to build peak-current mode pwm fyback power supplies. the device operates in quasi-resonant mode to provide high effciency and a number of key built-in protection features. the IW1781 can achieve tight multi-level constant voltage and multi-level constant current regulation without a traditional secondary-feedback circuit. it also eliminates the need for loop compensation components while maintaining stability over all operating conditions. the IW1781 supports usb power delivery (usb pd) and other proprietary rapid charging protocols with secondary- to-primary digital communication handled by secondary-side rapid charge interface circuits, including third party ics. the IW1781 is optimized to work with dialogs iw656 usb pd controller and other rapid charge protocol ics for ac/ dc adapters, to achieve fast and smooth voltage transition upon request by mobile devices (md). when paired with the iw656, the IW1781 eliminates the discrete decoders on the primary side, minimizes the external component count and simplifes system designs. the iw656 can communicate with the IW1781 through one optocoupler for all the necessary rapid charge information including output voltage requests, output current limits, output voltage undershoot and output over-voltage. the IW1781 also has a product option which offers dialogs exclusive smartgrouping control to provide a predictable frequency spectrum for mobile devices with highly sensitive touch panels. smartgrouping technology provides two- dimensional control of both the grouping size and grouping frequency with switching events at a fxed frequency inside the group. dialogs innovative proprietary technology ensures that power adapters designed with the iw656 and IW1781 can provide multiple levels of output voltage and constant current limit negotiated by mds. furthermore, the chipset can achieve <20mw no-load power consumption at 5v/3a output setting and fast dynamic load response in typical ac/dc rapid charge adapter designs. 2 features support usb pd, optional qc2.0/3.0 and other proprietary rapid charge protocols with secondary-side interface circuits pairs with iw656 to provide optimized usb pd solutions support multi-level v bus from 3v to 20v in 25mv increments with multi-level current limits proprietary secondary-to-primary digital communication with single optocoupler for all the rapid charge information: x output voltage request x output current limit x output voltage undershoot detection for fast dynamic load response x over-voltage protection tight multi-level constant-voltage and multi-level constant-current regulation with primary-side feedback and control ultra-low no-load power consumption with lowest system cost (<20mw at 230v ac with typical 5v/3a setting) no audible noise over entire operating range proprietary optimized load adaptive maximum constant frequency pwm switching with quasi- resonant operation achieves best size, effciency, and common mode noise multi-mode pwm/pfm control improves effciency at various load conditions optional smartgrouping control provides a predictable frequency spectrum for mobile devices with highly sensitive touch panels user-confgurable 4-level cable drop compensation independent of output voltage ez-emi ? design enhances manufacturability built-in single-point fault protections against output short-circuit including soft short and half short, output over-voltage, and output over-current smartdefender ? smart hiccup technology helps address issues of soft shorts in cables and connectors by effectively reducing the average output power at fault conditions without latch user-confgurable external shutdown control IW1781 rapid charge? ac/dc digital quasi-resonant pwm controller with high resolution voltage/current control rev. 0.2 preliminary product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 09-may-2017
2 of 6 figure 2.1 : IW1781 typical application circuit for standard usb pd with optional qc2.0/qc3.0 enabled (using iw656 as secondary-side controller for usb pd and iw676 as synchronous rectifer controller .) cc2 cc1 d+ d- u1 IW1781 v sense sd v cc gnd 1 2 3 8 7 6 4 5 ntc l n output cs/cdc dlnk asu r cdc v bus gnd v in v cc 1 2 3 6 5 4 + gnd u3 iw676 drain source out u2 iw656 1 2 12 11 3 10 dis drv v cc gnd d- d+ 4 5 6 9 8 7 sd v bus v bus_g cc2 det cc1 + + - + br1 ac input type-c socket 3 applications rapid charge ac/dc power adapter for smart phones, tablets and other mds equipped with usb pd, direct charge and other protocols IW1781 rapid charge? ac/dc digital quasi-resonant pwm controller with high resolution voltage/current control rev. 0.2 preliminary product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 09-may-2017
3 of 6 4 pinout description pin number pin name type pin description 1 v sense analog input auxiliary voltage sense. used for primary-side regulation. 2 sd analog input external shutdown control. can be confgured for external over-temperature protection (otp) by connecting an ntc resistor from this pin to ground. 3 dlnk analog input digital communication link signal. used for secondary-side to primary-side communication for all rapid change information, which includes output voltage requests, output current limits, output voltage undershoot, and over-voltage protection. 4 asu output control signal. used for active start-up device (bjt or depletion mode n-fet). 5 cs/cdc analog input primary-side current sense and external cable drop compensation (cdc). used for cycle-by-cycle peak-current control and limit in primary-side cv/cc regulation. also used for cdc confguration. 6 output output gate drive for external mosfet switch. 7 gnd ground ground 8 v cc power input ic power supply. 171 1 2 7 figure 4.1 : 8-lead soic-8 package IW1781 rapid charge? ac/dc digital quasi-resonant pwm controller with high resolution voltage/current control rev. 0.2 preliminary product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 09-may-2017
4 of 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 20 ma asu output (pin 4) -0.3 to 19.0 v output (pin 6) -0.3 to 20.0 v v sense input (pin 1, i v sense 10ma) -0.7 to 10.0 v cs/cdc input (pin 5) -0.3 to 4.0 v sd (pin 2) -0.3 to 4.0 v dlnk (pin 3) -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 160 c/w esd rating per jedec jesd22-a114 2,000 v latch-up test per jesd78d 100 ma absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. for maximum safe operating conditions, refer to the electrical characteristics section. 5 absolute maximum ratings IW1781 rapid charge? ac/dc digital quasi-resonant pwm controller with high resolution voltage/current control rev. 0.2 preliminary product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 09-may-2017
5 of 6 6 physical dimensions 7 ordering information 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 part number options package description protocol supported default k cc at start-up cc shutdown voltage v bus resolution latch conditions cv operation modes l: usb pd and other protocols r bus pws n/a : 6,& tape & reel 1 l: usb pd and other protocols no cc operation pws 7 : 6,& tape & reel 1 l: usb pd and other protocols ru bus ru bus ru bus pws n/a pwm/ smart - rouping 6,& tape & reel 1 note 1: tape & reel packing quantity is 2,500/reel. minimum ordering quantity is 2,500. IW1781 rapid charge? ac/dc digital quasi-resonant pwm controller with high resolution voltage/current control rev. 0.2 preliminary product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 09-may-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. IW1781 rapid charge? ac/dc digital quasi-resonant pwm controller with high resolution voltage/current control rev. 0.2 preliminary product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 09-may-2017 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
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