1 of 6 1 description the IW1770 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 operates in quasi-resonant mode to provide high effciency and includes a number of key built-in protection features while minimizing the external component count, simplifying emi design and lowering the total bill of material cost. the IW1770 can operate at peak power mode with momentary peak power higher than the maximum continuous output power without design cost and size increase. the IW1770 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. pulse-by-pulse waveform analysis allows for a fast dynamic load transient reponse. 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 IW1770 can achieve both the highest average active effciency and less than 50mw no-load power consumption in 20w output power range, and 2 features no-load power consumption < 50mw at 230v ac along with fast dynamic load response and short turn-on delay in typical 20w and above adapter applications primaccurate tm primary-side feedback eliminates opto-isolators and simplifes design peak power mode provides momentary peak power higher than the maximum continuous output power without design cost and size increase 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 tight constant-voltage (cv) regulation across line and load range 3 applications power supplies requiring peak power capability such as network devices, ultrabooks and home electronics universal input ac/dc adapters (15w - 40w) proprietary optimized 79khz maximum pwm switching frequency with quasi-resonant operation achieves best size, effciency and common mode noise user-confgurable 5-level cable drop compensation ez-emi ? design enhances manufacturability adaptive multi-mode pwm/pfm control improves effciency and eliminates audible noise built-in single-point fault protections against output short-circuit, output over-voltage, output over-current, and current-sense-resistor-short fault on-chip internal over-temperature protection dedicated pins for user-confgurable external shutdown control IW1770 off-line digital quasi-resonant pwm controller with peak power operation rev. 1.1 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 15-july-2016
2 of 6 figure 3.1 : IW1770 typical application circuit (using depletion mode n-fet as active start-up device) (achieving < 50mw no-load power consumption in 20w adapter designs) figure 3.2 : IW1770 typical application circuit (alternative circuit without using active start-up device and without using external shutdown control at pin 3) note: pin 3 (sd_h) can be left unconnected if high-level-triggered external shutdown control is not needed. pin 4 (asu) can be left unconnected if an active start-up device is not needed. l n v out rtn + + + u1 IW1770 v sense sd_l sd_h asu v cc gnd output cs/cdc 1 2 3 8 7 6 4 5 ntc r cdc l n v out rtn + + + u1 IW1770 v sense sd_l sd_h asu v cc gnd output cs/cdc 1 2 3 8 7 6 4 5 ntc r cdc IW1770 off-line digital quasi-resonant pwm controller with peak power operation rev. 1.1 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 15-july-2016
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_l analog input external shutdown control when input goes low. can be confgured for external over-temperature protection (otp) by connecting an ntc resistor from this pin to ground. 3 sd_h analog input external shutdown control when input goes high. can be confgured for supplemental over-voltage protection (ovp). 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 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. figure 4.1 : 8 lead soic-8 package IW1770 v sense sd_l sd_h asu v cc gnd output cs/cdc 1 2 3 8 7 6 4 5 IW1770 off-line digital quasi-resonant pwm controller with peak power operation rev. 1.1 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 15-july-2016
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 vsense 10ma) -0.7 to 4.0 v cs/cdc input (pin 5) -0.3 to 4.0 v sd (pin 2) -0.3 to 4.0 v sd_h (pin 3, i sd_h 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 C65 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 jesd78a 100 ma absolute maximum ratings are the parameter values or ranges which can cause permanent damage if exceeded. 5 absolute maximum ratings IW1770 off-line digital quasi-resonant pwm controller with peak power operation rev. 1.1 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 15-july-2016
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 no. options package description IW1770-00-b no ovp/otp latch; peak power mode timer = 40ms soic-8 tape & reel 1 IW1770-03 no ovp/otp latch; peak power mode timer = 160ms soic-8 tape & reel 1 IW1770-23 ovp/external otp latch; peak power mode timer = 160ms soic-8 tape & reel 1 note 1: tape & reel packing quantity is 2,500/reel. minimum ordering quantity is 2,500. IW1770 off-line digital quasi-resonant pwm controller with peak power operation rev. 1.1 product summary ? 2016 dialog semiconductor www.dialog-semiconductor.com 15-july-2016
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