1 of 8 1 description the IW1702 is a high performance, digital ac/dc power supply controller for high-power, peak current mode fyback converters. the device integrates a programmable light load mode of operation allowing the power supply designer to optimize for no-load power consumption and dynamic load response. it operates in quasi-resonant mode to provide high effciency at heavy loads and minimizes the external component count while simplifying emi design and lowering the total bill of material cost. dialogs primaccurate tm primary-side sensing technology allows the IW1702 to eliminate the need for secondary-side feedback while achieving excellent line and load regulation. this proprietary digital control technology also eliminates the need for loop compensation components while maintaining stability over all operations. pulse-by-pulse waveform analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load response. the built-in power limit function enables optimized transformer design in universal off-line applications and allows for a wide input voltage range. dialogs innovative proprietary technology ensures that power supplies built with the IW1702 can achieve both the highest average active effciency and less than 75mw no-load power consumption. active start-up circuitry enables fast, yet smooth start-up into large capacitive loads at output voltages of 9v, 12v or higher, making it ideal for networking and monitor adaptor applications. the IW1702 offers a full range of fault protection circuits including internal and external over-voltage protection (ovp). the external ovp feature can monitor either the input voltage or output voltage. the -0x/0xb and -3x/3xb options offer a supplemental output ovp, while the -1x/1xb options can monitor the input voltage, even during start-up, to protect from an over-voltage event on the input. 2 features IW1702-0x/0xb and IW1702-3x/3xb options: external supplemental output over-voltage protection, optimized for 9v+ output voltages IW1702-1x/1xb options: external input over-voltage protection, supports 5v+ output voltages adaptively controlled soft-start enables fast and smooth start-up into large capacitive loads (from 330 f to 6,000 f) at 9v+ output voltages internal single-point fault protections against output short-circuit, output over-voltage and output over- current user-confgurable light-load operation mode for optimized dynamic load response and no-load power consumption < 75mw no-load power consumption at 230v ac with fast dynamic load response in typical 12v, 2a 24w compact adapter/charger primaccurate tm primary-side feedback eliminates optocouplers and simplifes design 3 applications power adapters for network devices and monitors universal ac/dc adapters (5 C 45w) proprietary optimized 79khz maximum pwm switching frequency with quasi-resonant operation achieves best size, effciency and common mode noise ez-emi ? design enhances manufacturability adaptive multi-mode pwm/pfm control improves effciency user-confgurable 5-level cable drop compensation provides design fexibility in IW1702-0x/0xb and IW1702-3x/3xb options tight constant-voltage and constant current regulation across line and load range smartdefender ? smart hiccup technology helps to address issues of soft shorts in cables and connectors by effectively reducing the average output power at fault conditions without latch optional on-chip internal over-temperature protection no audible noise over entire operating range space-saving sot-23 package IW1702 offine digital quasi-resonant pwm controller optimized for 9v+ applications with option for input ovp rev. 1.4 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 24-oct-2017
2 of 8 l + v out gnd + u1 IW1702-0xb/3xb v cc v sense cfg output gnd cs/fs 1 5 3 6 4 2 n r fs r cdc r isns figure 3.1 : IW1702 typical application circuit (achieving < 75mw no-load power consumption in 12v, 2a 24w adapter design). l + u1 IW1702-1xb v cc v sense cfg output gnd cs/fs 1 5 3 6 4 2 n r fs r isns v out gnd + figure 3.2 : IW1702-1xb typical application circuit with input over-voltage protection. IW1702 offine digital quasi-resonant pwm controller optimized for 9v+ applications with option for input ovp rev. 1.4 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 24-oct-2017
3 of 8 figure 3.3 : IW1702-1xb typical application circuit with input over-voltage protection using transformer winding. o 1 1702-1 o 1 4 2 figure 3.4 : IW1702 typical application circuit with supplement output over-voltage protection and iw676-32 secondary synchronous rectifer controller with active voltage positioning. l + u1 IW1702 v cc v sense cfg output gnd cs/fs 1 5 3 6 4 2 n r fs r isns v out rtn + + u2 iw676-32 drain source out v in v cc gnd 1 5 3 6 4 2 r damp IW1702 offine digital quasi-resonant pwm controller optimized for 9v+ applications with option for input ovp rev. 1.4 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 24-oct-2017
4 of 8 4 pinout description pin number pin name type pin description 1 v cc power input ic power supply. 2 v sense analog input auxiliary voltage sense. it is used for primary-side regulation and detection of secondary-side load transient signal. 3 cfg analog input in IW1702-0x/0xb and IW1702-3x/3xb options, it is used for external cable drop compensation (cdc) confgu ration and supplemental output over-volt - age protection (ovp). in IW1702-1x/1xb options, it is dedicated to input ovp . 4 cs/fs analog input primary-side current sense and minimum switching frequency confguration. it is used for cycle-by-cycle peak-current control and limit in primary-side cv/ cc regulation. it is also used for minimum switching frequency confguration. 5 gnd ground ground. 6 output output gate drive for the external mosfet switch. figure 4.1 : 6-lead sot23 package IW1702 v cc v sense cfg output gnd cs/fs 1 2 3 6 4 5 IW1702 offine digital quasi-resonant pwm controller optimized for 9v+ applications with option for input ovp rev. 1.4 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 24-oct-2017
5 of 8 parameter symbol value units dc supply voltage range (pin 1, 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 output (pin 6) -0.3 to 20.0 v v sense input (pin 2, i vsense 10ma) -0.7 to 4.0 v cs/fs input (pin 4) -0.3 to 4.0 v cfg (pin 3, i cfg 20ma) -0.8 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 208 c/w esd rating per jedec jesd22-a114 2,000 v latch-up test per jesd78a 100 ma absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. 5 absolute maximum ratings IW1702 offine digital quasi-resonant pwm controller optimized for 9v+ applications with option for input ovp rev. 1.4 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 24-oct-2017
6 of 8 6 physical dimensions IW1702 offine digital quasi-resonant pwm controller optimized for 9v+ applications with option for input ovp rev. 1.4 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 24-oct-2017
7 of 8 part number status options 1 package description external cfg over- voltage protection option cc shutdown voltage at 5v output 2 latch conditions cdc IW1702-00 not recommend for new design output no cc operation no latch yes sot-23 tape & reel 3 IW1702-31 not recommend for new design output 0.75v no latch yes sot-23 tape & reel 3 IW1702-10 not recommend for new design input 4v no latch no sot-23 tape & reel 3 IW1702-00b active output no cc operation no latch yes sot-23 tape & reel 3 IW1702-31b active output 0.75v no latch yes sot-23 tape & reel 3 IW1702-10b active input 4v no latch no sot-23 tape & reel 3 note 1: for availability of additional options, please contact marketing. note 2: please refer to section 9.5 for cc shutdown voltage at dif ferent nominal output voltages. note 3: tape and reel packing quantity is 3,000/reel. minimum ordering quantity is 3,000. 7 ordering information IW1702 offine digital quasi-resonant pwm controller optimized for 9v+ applications with option for input ovp rev. 1.4 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 24-oct-2017
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