specifications of any and all sanyo semiconductor co.,l td. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer ' s products or equipment. to verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ' sproductsor equipment. any and all sanyo semiconductor co.,ltd. products described or contained herein are, with regard to "standard application", intended for the use as general el ectronics equipment (home appliances, av equipment, communication device, office equipment, industrial equ ipment etc.). the products mentioned herein shall not be intended for use for any "special application" (medica l equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, t ransportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of re liability and can directly threaten human lives in case of failure or malfunction of the product or may cause har m to human bodies, nor shall they grant any guarantee thereof. if you should intend to use our products for app lications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. if there is n o consultation or inquiry before the intended use, our customer shall be solely responsible for the use. o1707 ms pc 20070801-s00001 no.a0921-1/5 LA5648 overview the LA5648 is a controller ic for rcc power supply systems. features ? rcc power supply controller ? overcurrent detection function ? soft start function ? built-in uvlo circuit ? output overcurrent protection timer function ? base winding voltage detection function specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max 30 v output peak current iout 0.9 a out vout -900ma to +900ma 0 to v cc v syc vsyc -2ma to +4ma -0.3 to +2.5 v vpc vpc -600 a to +1ma -0.2 to +3.5 v cf vcf -50 a to +5ma -0.2 to +3.5 v ct ct -15 a to +500 a -0.2 to +3.5 v allowable pin voltages ocl ocl -60 a to 0 a -0.2 to +3.5 v allowable power dissipation pd max ta = 25 c 0.6 w operating temperature topr -30 to +85 c storage temperature tstg -55 to +150 c * voltages are referenced to the com pin. the polarity of a cu rrent that flows out of the ic is regarded as negative (minus). monolithic linear ic rcc power supply controller orderin g numbe r : ena0921
LA5648 no.a0921-2/5 recommended operating conditions at ta = 25 c parameter symbol conditions ratings unit supply voltage v cc after uvlo release* 5.0 to 26.4 v * : when v cc is increasing, uvlo is released at 11v. when v cc is decreasing, uvlo operates at 3v. electrical characteristics at ta = 25 c, v cc = 5.0v ratings parameter symbol conditions min typ max unit current dissipation 1 i cc 1 when stopped 3 3.8 5 ma current dissipation 2 i cc 2 when in 18khz continuous oscillation mode. with a 50 resistor and a 1 f capacitor 3 6.4 10 ma output saturation characteristics (h1) vsath1 iout = -150ma 2.4 2.8 v output saturation characteristics (h2) vsath2 iout = -10ma 2.1 2.5 v output saturation characteristics (l1) vsatl1 iout = 150ma 1.50 1.80 v output saturation characteristics (l2) vsatl2 iout = 10ma 0.2 0.4 v output peak current (source) iout_ph tj = 0 to 100 c, vce = 30v, design guarantee value value* -350 ma output peak current (sink) iout_pl tj = 0 to 100 c, vce = 30v, design guarantee value value* 700 ma output rise time tr 0 1000 3000 ns output fall time tf 0 1000 3000 ns ocl1 sensitivity vtho cl1 0.180 0.200 0.220 v ocl1 sensitivity temperature characteristics kocl1 design guarantee value value* 600 ppm/ c ocl1 response time tocl1 0 1000 3000 ns ocl1 source current iocl1 -45 -31 -20 a maximum time ratio max when the external capacitor of 1500pf is used. 75 81 85 % max pin voltage vpc max when the external capacitor of 1500pf is used. 1.65 1.82 2.10 v max source current ipc max when the external capacitor of 1500pf is used. -300 -200 -120 a max pin voltage vpc 0 when the external capacitor of 1500pf is used. 0.500 0.540 0.660 v max source current ipc 0 when the external capacitor of 1500pf is used. -490 -350 -240 a control sensitivity kpc when the external capacitor of 1500pf is used. 51 73 80 %/v timer charging start current ipclim when the external capacitor of 1500pf is used. 113 90 67 a protection time ratio lim when the external capacitor of 1500pf is used. 23 31 37 % syc source current (hi) isyc (hi) -18 -15 -12 a syc source current (lo) isyc (lo) -12 -10 -8 a syc sensitivity (hi) vthsyc (hi) including external 20k -0.22 -0.19 -0.16 v syc sensitivity (lo) vthsyc (lo) including external 20k -0.34 -0.28 -0.21 v syc sensitivity temperature characteristics kthsyc * design guarantee value 500 ppm/ c syc clamp voltage (h) vsclmh 0.65 0.75 0.85 v syc clamp voltage (l) vsclml -0.60 -0.38 -0.25 v cf current when syc operating ioscoff -2 0 2 a oscillation frequency fosc when the external capacitor of 1500pf is used 15.8 17.5 19.3 khz oscillation frequency voltage characteristics koscv 15 hz/v oscillation frequency temperature characteristics kosc * design guarantee value 250 ppm/ c oscillation waveform upper limit voltage vosch when the external capacitor of 1500pf is used. 1.92 2.03 2.17 v oscillation waveform lower limit voltage voscl when the external capacitor of 1500pf is used. 0.75 0.89 1.00 v continued on next page.
LA5648 no.a0921-3/5 continued from preceding page. ratings parameter symbol conditions min typ max unit timer charge current ictchg -9.0 -6.0 -4.0 a timer discharge current ictdchg vct = 1v 30 55 75 a timer sensitivity voltage vct_h 1.25 1.31 1.37 v uvlo release voltage vuvlo_h 9.5 10.3 11.0 v uvlo operating voltage vuvlo_l 2.5 3.3 4.0 v * : the temperature characteristics within a range of -30 c to +150 c are design guarantee values. package dimensions unit : mm (typ) 3001d pin assignment sanyo : dip8(300mil) 9.14 14 85 1.4 1.0 6.4 7.62 0.25 (3.0) 3.9max 0.51min 3.2 (0.76) 2.54 0.5 v cc out 1 2 3 4 com syc 8 7 6 5 vpc cf ct ocl top view LA5648 pd max -- ta ambient temperature, ta ? c allowable power dissipation, pd max ? w 0 0.2 0.8 0.6 0.4 ? 30 ? 20 0 20 40 60 80 100 85 0.31 independent ic
LA5648 no.a0921-4/5 pin description pin no. pin name description 1 v cc power pin 2 out output pin. connected to an external mos-fet gate. 3 com common potential or ground 4 syc sync signal input pin. base winding voltage is input. if this voltage is negative, the internal triangular wave oscillato r stops and output is set low. the oscillator and output turn on at the timing when the voltage switches from negative to positive. fixing this pin at a positive voltage causes t he oscillator to run continually, enabling operation using the external excitation. 5 vpc control signal input pin. the secondary side output voltage data is sent to this pin via a photo coupler. internal pwm comparator input. the output on time gets shorter as th e input voltage lowers. the output on time is fixed when a voltage higher than a certain level is applied. the timer also starts operation. 6 cf oscillation capacitor connection pin. 7 ct timer capacitor connection pin. charging operation star ts when the vpc voltage gets higher than a certain level. output is stopped when the ct pin voltage becomes higher than a certain level. 8 ocl overcurrent detection pin. connected to the source voltage of the external mos-fet. the output is stopped by triggering the internal ff. the internal ff is reset by the syc pin voltage on a pulse by pulse basis. block diagram v cc out com sy c vp c cf ct oc l 1.2v vref 3.5v vref logic + - - + - uvlo triang osc pwm comp timer + -
LA5648 ps no.a0921-5/5 sanyo semiconductor co.,ltd. assumes no responsib ility for equipment failures that result from using products at values that exceed, even momentarily, rate d values (such as maximum ra tings, operating condition ranges, or other parameters) listed in products specif ications of any and all sanyo semiconductor co.,ltd. products described or contained herein. sanyo semiconductor co.,ltd. strives to supply high-qual ity high-reliability products, however, any and all semiconductor products fail or malfunction with some probabi lity. it is possible that these probabilistic failures or malfunction could give rise to acci dents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause dam age to other property. when designing equipment, adopt safety measures so that these kinds of accidents or e vents cannot occur. such measures include but are not limited to protective circuits and error prevention c ircuits for safe design, redundant design, and structural design. upon using the technical information or products descri bed herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of sanyo semiconductor co.,ltd. or any third party. sanyo semiconductor co.,ltd. shall not be liable f or any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. information (including circuit diagr ams and circuit parameters) herein is for example only; it is not guaranteed for volume production. any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. when designing equi pment, refer to the "delivery specification" for the sanyo semiconductor co.,ltd. product that you intend to use. in the event that any or all sanyo semiconductor c o.,ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities conc erned in accordance with the above law. no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any in formation storage or retrieval system, or otherwise, without the prior written consent of sanyo semiconductor co.,ltd. sample application circuit this catalog provides information as of october, 2007. specifications and information herein are subject to change without notice. v cc out com syc vpc cf ct ocl LA5648 d5 d4 r6 r10 c8 c5 c9 r5 c6 m1 d3 r9 r1 c3 d1 c4 d2 r3 nb np r7 v1 140v r2 r8 c7 r4 pc c1 c2
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