1 of 6 1 description the IW1709 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 IW1709 features a distinctive soft-start scheme, which allows for fast and yet smooth start-up with both small and large capacitive loads. the IW1709 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 IW1709 can achieve both the highest average effciency and less than 50mw no-load power consumption; they also have fast yet smooth start-up with a wide range of capacitive loads with output voltage of 12v and above, and are ideal for network, set-top box, and home appliance power supply applications. 2 features optimized for 12v/1a ac/dc adapters with <50mw no-load power consumption at 230v ac and fast dynamic response direct drive of low-cost bjt power switch adaptively controlled soft start enables fast and smooth start-up for a wide range of capacitive loads (from 330f to 6,000f) with output voltage of 12v and above very tight constant voltage and constant current regulation over entire operating range primaccurate tm primary-side feedback eliminates opto-isolator and simplifes design ez-emi ? design enhances manufacturability intrinsically low common mode noise 3 applications network power adapters for adsl, wireless access points and routers ac/dc adapter for set-top box ac/dc power supplies for home appliances 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 IW1709 off-line digital green-mode quasi-resonant pwm controller rev. 1.0 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 6-january-2017
2 of 6 figure 3.1 : IW1709 typical application circuit (achieving < 50mw no-load power consumption in 12v/1a adapter designs. using depletion mode nfet as active start-up device.) l + u1 IW1709 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 IW1709 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 : IW1709 typical application circuit (achieving < 100mw no-load power consumption in 12v/1a adapter designs. alternative circuit without using active start-up device.) IW1709 off-line digital green-mode quasi-resonant pwm controller rev. 1.0 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 6-january-2017
3 of 6 4 pinout description pin number 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. IW1709 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-8 package IW1709 off-line digital green-mode quasi-resonant pwm controller rev. 1.0 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 6-january-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 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 155 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 electrical characteristics in section 6. 5 absolute maximum ratings IW1709 off-line digital green-mode quasi-resonant pwm controller rev. 1.0 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 6-january-2017
5 of 6 part number options package description IW1709-00 cable comp = 0mv, otp recovery threshold = 100c soic-8 tape & reel 1 IW1709-01 cable comp = 150mv, otp recovery threshold = 100c soic-8 tape & reel 1 IW1709-11 cable comp = 150mv, otp recovery threshold = 120c soic-8 tape & reel 1 note 1: tape & reel packing quantity is 2,500/reel. minimum ordering quantity is 2,500. 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 IW1709 off-line digital green-mode quasi-resonant pwm controller rev. 1.0 product summary ? 2017 dialog semiconductor www.dialog-semiconductor.com 6-january-2017
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