2010/08 str-w6700 series power ic for quasi-resonant type switching power su pply with high efficiency and low noise in full load ran ge general descriptions the str-w6700 series products are power ics for qua si-resonant type switching power supplies, incorporating a power mosfet and a contro ller ic, the product achieves high efficiency and low noise power supply systems by th e quasi-resonant operation and the bottom-skip quasi-resonant operation. the str-x6700 series products are the different pac kage (to-3pf) versions. features multi-mode control the operation mode switching with three steps accor ding to load conditions achieves the optimal high efficiency and low noise power supply systems across the full load range. (the confirmation of product number is necessary be cause some functions are different in each product.) ? in standby (under standby load conditions): uvlo intermittent oscillation by lowering output vo ltage --- switched by standby signal, or auto burst-oscillation --- switched automatically ? under low to middle load conditions: bottom-skip qu asi-resonant operation (bottom-skip qr) ? under middle to rating (or heavy) load conditions: quasi-resonant operation (qr) current-mode control built-in pwm oscillator the pwm operates with the minimum frequency of arou nd 22 khz, until the quasi-resonant signal becomes valid, reduces the stress on components at startup and load-shorted. soft-start function step-drive function, reducing switching noise built-in maximum on time limitation circuit the function limits the maximum on time of power mo sfet, during the transitions at low input voltage, power on/off. input compensation at overcurrent the function reduces the distortion of overcurrent operation point to ac input voltage change by addin g three components. built-in avalanche energy guaranteed high-voltage p ower mosfet various protections overcurrent protection (ocp) --------------------- ----------- pulse-by-pulse overload protection (olp)---------------------- ---------------- latch shutdown overvoltage protection (ovp) ------------------ -------------- latch shutdown applications switching power supplies for digital consumer equipment; lcd-tvs, pdp-tvs, crt-t vs, etc., home appliances, oa equipments, industry machines, communication devices, others product lineup product no. mosfet v dss m in (v) r ds ( on ) max ( ) burst- oscillation bottom- skip qr product no. mosfet v dss m in (v) r ds ( on ) max ( ) burst- oscillation bottom- skip qr str-w6723n 450 1.4 n y str-w6750f 650 0.73 y n str-w6734 500 1.0 y y str-w6756 650 0.73 y y str-w6735 500 0.57 y y str-w6756n 650 0.73 n y str-w6735n 500 0.57 n y str-w6765 800 1.8 y y str-w6753 650 1.7 y y str-w6765n 800 1.8 n y str-w6754 650 0.96 y y y: including the function n: excluding the functi on to-220f-6 www..net
sanken electric co.,ltd. 2010/08 warning the contents in this document are subject to change s, for improvement and other purposes, without noti ce. make sure that this is the latest version of the do cument before use. the operation and circuit examples in this document are provided for reference purposes only. sanken a ssumes no liability for violation of industrial pro perty, intellectual property, or other rights of sanken or third parties, that stem from these examp les. the user must take responsibility for considering a nd determining which objects the products in this d ocument are used with. although sanken will continue to improve the qualit y and reliability of its products, semiconductor products, by their nature, have certa in fault and failure rates. the user must take resp onsibility for designing and checking to secure the device and system so that a part failure may not l ead to human injury, fire, damages, or other losses. the contents in this document must not be transcrib ed or copied without sankens written consent. typical application circuit typical operation waveforms transitions between bottom-skip qr operation and qu asi-resonant operation c cc co oo on nn nt tt t 1 11 1 4 44 4 5 55 5 6 66 6 s ss st tt tr rr r- -- -w ww w6 66 67 77 70 00 00 00 0 7 77 7 3 33 3 f ff fb bb b o oo oc cc cp pp p/ // /b bb bd dd d s ss s/ // /g gg gn nn nd dd d d dd d v vv vc cc cc cc c s ss ss ss s/ // /o oo ol ll lp pp p r rr re ee eg gg g e ee er rr rr rr ra aa am mm mp pp p r rr re ee eg gg g l ll li ii in nn ne ee ea aa ar rr r r rr re ee eg gg gu uu ul ll la aa at tt to oo or rr r i ii ic cc c f ff fr rr ro oo om mm m s ss sa aa an nn nk kk ke ee en nn n, ,, , o oo ot tt th hh he ee er rr rs ss s g gg gn nn nd dd d + ++ +b bb b l ll lo oo ow ww w b bb b g gg gn nn nd dd d s ss st tt ta aa an nn nd dd db bb by yy y s ss st tt ta aa an nn nd dd db bb by yy y o oo on nn n/ // /o oo of ff ff ff f s ss si ii ig gg gn nn na aa al ll l v vv v o oo ou uu ut tt t u uu uv vv vl ll lo oo o i ii in nn nt tt te ee er rr rm mm mi ii it tt tt tt te ee en nn nt tt t o oo os ss sc cc ci ii il ll ll ll la aa at tt ti ii io oo on nn n c cc ci ii ir rr rc cc cu uu ui ii it tt t e ee ex xx xa aa am mm mp pp pl ll le ee e v vv va aa ac cc c v ds i d 1 bottom 1 bottom 1 bottom 1 bottom- -- -skip skip skip skip qr qrqr qr qr load change light heavy 0 20 40 60 80 100 120 140 0 50 100 150 200 250 vin(ac) = 240v 1skip 0 20 40 60 80 100 120 140 0 50 100 150 200 250 vin(ac) = 100v qr 1skip 0 20 40 60 80 100 120 140 0 50 100 150 200 250 vin(ac) = 240v 1skip 0 20 40 60 80 100 120 140 0 50 100 150 200 250 vin(ac) = 100v qr 1skip str-w6700 input power - frequency input power p in (w) input power p in (w) frequency f osc (khz) frequency f osc (khz) 100v ac 24 0v ac
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