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pwm/vfm step-down dc/dc converter with synchronous rectifier r1230d series 2002. jan. 30 rev. 1.15 - 1 - outline the r1230d series are pwm step-down dc/dc converters with synchronous rectifier, low supply current by cmos process. each of these ics consists of an oscillator, a pwm control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (uvlo), pwm/vfm alternative circuit, a chip enable circuit, and a driver transistor. a low ripple, high efficiency step-down dc/dc converter can be easily composed of this ic with only a few kinds of external components, or an inductor and capacitors. (as for r1230d001c/d types, divider resistors are also necessary.) in terms of output voltage, it is fixed internally in the r1230dxx1a/b types. while in the r1230d001c/d types, output voltage is adjustable with external divider resistors. pwm/vfm alternative circuit is active with mode pin of the r1230d series. thus, when the load current is small, the operation can be switching into the vfm operation from pwm operation by the logic of mode pin and the efficiency at small load current can be improved. as protection circuits, current limit circuit which limits peak current of lx at each clock cycle, and latch type protection circuit which works if the term of over-current condition keeps on a certain time in pwm mode exist. latch-type protection circuit works to latch an internal driver with keeping it disable. to release the condition of protection, after disable this ic with a chip enable circuit, enable it again, or restart this ic with power-on or make the supply voltage at uvlo detector threshold level or lower than uvlo. features built-in driver on resistance ? ? ? ? ? ? ? ? ? ? ? ? ? p-channel 0.35 ? , n-channel 0.45 ? (at v in =5v) built-in soft-start function (typ. 1.5ms), and latch-type protection function (delay time; typ. 1.5ms) two choices of oscillator frequency ? ? ? ? ? ? 500khz, 800khz pwm/vfm alternative with mode pin ? ? ? ? ? ? pwm operation; mode pin at ?l?, vfm operation; mode pin at ?h? high efficiency ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? typ. 90% output voltage ? ? ? ? ? ? ? ? ? stepwise setting with a step of 0.1v in the range of 1.2v 3.3v(xx1a/b type) or adjustable in the range of 0.8v to v in (001c/d type) high accuracy output voltage ? ? ? ? ? ? ? ? ? ? 2.0%(xx1a/b type) package ? ? ? ? ? son8 (max height 0.9mm, thin type) applications power source for portable equipment.
rev. 1.15 - 2 - block diagram r1230dxx1a/b v in lx agnd v out osc vref ce chip enable soft start current protection pwm/vfm control output control uvlo phase compensation ?h? active mode pgnd v dd ?l?= pwm ce ?h?= vfm r1230d001c/d v in lx agnd v fb osc vref ce chip enable soft start current protection pwm/vfm control output control uvlo phase compensation ?h? active mode pgnd v dd ?l?= pwm ?h?= vfm
rev. 1.15 - 3 - selection guide in the r1230d series, the output voltage, the oscillator frequency, and the taping type for the ics can be selected at the user?s request. the selection can be made by designating the part number as shown below; r1230dxxxx-xx a b c d code contents a setting output voltage(v out ): stepwise setting with a step of 0.1v in the range of 1.2v to 3.3v is possible for a/b version. ?00? is for output voltage adjustable c/d version b 1 : fixed c designation of optional function a : 500khz, fixed output voltage b : 800 khz, fixed output voltage c : 500khz, adjustable output voltage d : 800khz, adjustable output voltage d designation of taping type; ex. :tr,tl(refer to taping specification) ?tr? is prescribed as a standard. pin configuration son-8 *attention : tab suspension leads in the parts have gnd level. (they are connected to the reverse side of this ic.) do not connect to other wires or land patterns. unit : mm 2.9 0.2 0.48typ 3.0 0.2 2.8 0.2 8 5 1 4 0.9 max. 0.1 0.1 m 0.3 0.1 0.65 0.13 0.05 (0.2) (0.2) * *
rev. 1.15 - 4 - pin description pin no. symbol description 1v in voltage supply pin 2 pgnd ground pin 3v dd voltage supply pin 4 ce chip enable pin (active with ?h?) 5v out /v fb output/feedback pin 6 mode mode changer pin (pwm mode at ?l?, vfm mode at ?h?.) 7 agnd ground pin 8lx lx pin absolute maximum ratings (agnd=pgnd=0v) symbol item rating unit v in v in supply voltage 6.5 v v dd v dd pin voltage 6.5 v v lx lx pin voltage -0.3 v in +0.3 v v ce ce pin input voltage -0.3 v in +0.3 v v mode mode pin input voltage -0.3 v in +0.3 v v fb v fb pin input voltage -0.3 v in +0.3 v i lx l x pin output current -0.8 a p d power dissipation 250 mw topt operating temperature range -40 +85 c tstg storage temperature range -55 +125 c
rev. 1.15 - 5 - electrical characteristics r1230d**1a/b (topt=25 c) symbol item conditions min. typ. max. unit v in operating input voltage 2.4 5.5 v v out step-down output voltage v in =v ce =v set +1.5v, v mode =0v, i out =10ma typ. 0.980 v set typ. 1.020 v ? v out / ? t step-down output voltage temperature coefficient -40 c topt 85 c 150 ppm / c fosc oscillator frequency(xx1a) v in =v ce =v set +1.5v 425 500 575 khz fosc oscillator frequency(xx1b) v in =v ce =v set +1.5v 680 800 920 khz i dd supply current(xx1a) v in =v ce =v set +1.5v, v out =v mode =0v 230 300 a i dd supply current(xx1b) v in =v ce =v set +1.5v, v out =v mode =0v 250 350 a i stb standby current v in =5.5v, v ce =v out =0v 0 5 a r onp on resistance of pch transistor v in =5.0v 0.20 0.35 0.60 ? r onn on resistance of nch transistor v in =5.0v 0.20 0.45 0.70 ? i lx leak lx leakage current v in =5.5v, v ce =0v, v lx =0v/5.5v -0.1 0.0 0.1 a i vout v out leakage current v in =5.5v, v ce =0v, v lx =0v/5.5v -0.1 0.0 0.1 a i ce ce input current v in =5.5v, v mode =0v, v ce =5.5v/0v -0.1 0.0 0.1 a v ceh ce "h" input voltage v in =5.5v, v out =0v 1.5 v v cel ce "l" input voltage v in =2.4v, v out =0v 0.3 v maxdty oscillator maximum duty cycle v mode =0v 100 % v lx lx limit voltage v mode = v out =0v, v in =v ce =3.0v v in -0.15 v in -0.35 v in - 0.55 v t start delay time by soft-start function at no load, v in =v ce =v set +1.5v 0.5 1.5 2.5 ms t prot delay time for protection circuit v in =v ce =v set +1.5v, v mode =0v 0.5 1.5 2.5 ms v uvlo1 uvlo threshold voltage v in =v ce =2.5v->1.5v, v out =0v 1.8 2.1 2.2 v v uvlo2 uvlo released voltage v in =v ce =1.5v->2.5v, v out =0v 1.9 2.2 2.3 v i mode mode pin input current v in =5.5v, v ce =0v, v mode =5.5v/0v -0.1 0.1 a v modeh mode ?h? input voltage v in =v ce =5.5v, v out =0v 1.5 v v model mode ?l? input voltage v in =v ce =2.4v, v out =0v 0.3 v vfmdty vfm duty cycle v in =v ce = v mode =2.4v, v out =0v 55 65 85 %
rev. 1.15 - 6 - r1230d001c/d (topt=25 c) symbol item conditions min. typ. max. unit v in operating input voltage 2.4 5.5 v v fb feedback voltage v in =v ce =v set +1.5v, v mode =0v, i out =10ma 0.776 0.800 0.824 v ? v fb / ? t feedback voltage temperature coefficient -40 c topt 85 c 150 ppm / c fosc oscillator frequency(xx1c) v in =v ce =v set +1.5v 425 500 575 khz fosc oscillator frequency(xx1d) v in =v ce =v set +1.5v 680 800 920 khz i dd supply current(xx1c) v in =v ce =5.5v, v fb =v mode =0v 230 300 a i dd supply current(xx1d) v in =v ce =5.5v, v fb =v mode =0v 250 350 a i stb standby current v in =5.5v, v ce =v fb =0v 0 5 a r onp on resistance of pch transistor v in =5.0v 0.20 0.35 0.60 ? r onn on resistance of nch transistor v in =5.0v 0.20 0.45 0.70 ? i lx leak lx leakage current v in =5.5v, v ce =0v, v lx =0v/5.5v -0.1 0.0 0.1 a i vfb v fb leakage current v in =5.5v, v ce =0v, v fb =0v/5.5v -0.1 0.0 0.1 a i ce ce input current v in =5.5v, v mode =0v, v ce =5.5v/0v -0.1 0.0 0.1 a v ceh ce "h" input voltage v in =5.5v, v fb =0v 1.5 v v cel ce "l" input voltage v in =2.4v, v fb =0v 0.3 v maxdty oscillator maximum duty cycle v mode =0v 100 % v lx lx limit voltage v in =v ce =3.0v, v mode =0v, v fb =0v v in -0.15 v in - 0.35 v in - 0.55 v t start delay time by soft-start function at no load, v in =v ce =v set +1.5v 0.5 1.5 2.5 ms t prot delay time for protection circuit v in =v ce =3.6v, v mode =0v 1.5 ms v uvlo1 uvlo threshold voltage v in =v ce =2.5v->1.5v, v fb =0v 1.8 2.1 2.2 v v uvlo2 uvlo released voltage v in =v ce =1.5v->2.5v, v fb =0v 1.9 2.2 2.3 v i mode mode pin input current v in =5.5v, v mode =5.5v/0v, v ce =0v -0.1 0.1 a v mode mode ?h? input voltage v in =v ce =5.5v, v fb =0v 1.5 v v model mode ?l? input voltage v in =v ce =2.4v, v fb =0v 0.3 v vfmdty vfm duty cycle v in =v ce =v mode =2.4v, v fb =0v 55 65 85 %
rev. 1.15 - 7 - test circuits v in lx v dd ce v out agnd pgnd mode a oscilloscope v in lx v dd ce v out agnd p gnd mode test circuit for input current and leakage current test circuit for input voltage and uvlo voltage v in lx v dd ce v out agnd pgnd mode 10uf l v out oscilloscope test circuit for output voltage, oscillator frequency, soft-starting time v in lx v dd ce v out agnd pgnd mode a v in lx v dd ce v out agnd pgnd mode a oscilloscope test circuit for supply current and standby current test circuit for on resistance of lx, limit voltage, delay time of protection circuit the bypass capacitor between power supply and gnd is ceramic capacitor 10 f.
rev. 1.15 - 8 - typical application and technical notes 1) fixed output voltage type c in c out agnd mode v out ce v dd pgnd lx v in load l v out l : 10 h lqh3c100k54 (murata) c out : 10 f ecstojx106r (panasonic) c in : 10 f c3216jb0j106m (tdk) 2) adjustable output voltage type rb cb c in c out a gnd mode v fb ce v dd pgnd l x v in load r1 r 2 l v out l : 10 h lqh3c100k54 (murata) c out : 10 f ecstojx106r (panasonic) c in : 10 f c3216jb0j106m (tdk) as for how to choose cb, rb, r1, and r2 values, refer to the technical notes. when you use these ics, consider the following issues; input same voltage into power supply pins, v in and v dd . set the same level as agnd and pgnd. when you control the ce pin and mode pin by another power supply, do not make its "h" level more than the voltage level of v in / v dd pin. set external components such as an inductor, c in , c out as close as possible to the ic, in particular, minimize the wiring to v in pin and pgnd pin. at stand by mode, (ce=?l?), the lx output is hi-z, or both p-channel transistor and n-channel transistor of lx pin turn off. use an external capacitor c out with a capacity of 10 f or more, and with good high frequency characteristics such as tantalum capacitors. at vfm mode, (mode=?h?), latch protection circuit does not operate. if the mode is switched over into pwm mode from vfm mode during the operation, change the mode at light load current. if the load current us large, output voltage may decline.
rev. 1.15 - 9 - reinforce the v in , pgnd, and v out lines sufficiently. large switching current may flow in these lines. if the impedance of v in and pgnd lines is too large, the internal voltage level in this ic may shift caused by the switching current, and the operation might be unstable. ? the performance of power source circuits using these ics extremely depends upon the peripheral circuits. pay attention in the selection of the peripheral circuits. in particular, design the peripheral circuits in a way that the values such as voltage, current, and power of each component, pcb patterns and the ic do not exceed their respected rated values. operation of step-down dc/dc converter and output current the step-down dc/dc converter charges energy in the inductor when lx transistor is on, and discharges the energy from the inductor when lx transistor is off and controls with less energy loss, so that a lower output voltage than the input voltage is obtained. the operation will be explained with reference to the following diagrams: l cl v out i out v in pch tr i1 i2 nch tr t=1/fosc toff ton ilmax ilmin topen step 1: p-channel tr. turns on and current il (=i1) flows, and energy is charged into cl. at this moment, il increases from ilmin(=0) to reach ilmax in proportion to the on-time period(ton) of p-channel tr. step 2: when p-channel tr. turns off, synchronous rectifier n-channel tr. turns on in order that l maintains il at ilmax, and current il (=i2) flows. step 3: il (=i2) decreases gradually and reaches il=ilmin=0 after a time period of topen, and n-channel tr. turns off. provided that in the continuous mode, next cycle starts before il becomes to 0 because toff time is not enough. in this case, il value increases from this ilmin(>0). in the case of pwm control system, the output voltage is maintained by controlling the on-time period (ton), with the oscillator frequency (fosc) being maintained constant. discontinuous conduction mode and continuous conduction mode the maximum value (ilmax) and the minimum value (ilmin) of the current flowing through the inductor are the same as those when p-channel tr. turns on and off. the difference between ilmax and ilmin, which is represented by ? i; ? i = ilmax ? ilmin = v out topen / l = (v in -v out ) ton/l ??? equation 1 wherein t=1/fosc=ton+toff duty (%)=ton/t 100=ton fosc 100 topen toff in equation 1, v out topen/l and (v in -v out ) ton/l respectively show the change of the current at ?on?, and the change of the current at ?off?. when the output current (i out ) is relatively small, topen0). the former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode. in the continuous mode, when equation 1 is solved for ton and assumed that the solution is tonc,
rev. 1.15 - 10 - tonc =t v in /v out ??? equation 2 when ton rev. 1.15 - 11 - external components 1. inductor select an inductor that peak current does not exceed ilmax. if larger current than allowable current flows, magnetic saturation occurs and make transform efficiency worse. supposed that the load current is at the same, the smaller value of l is used, the larger the ripple current is. provided that the allowable current is large in that case and dc current is small, therefore, for large output current, efficiency is better than using an inductor with a large value of l and vice versa. 2. capacitor as for c in , use a capacitor with low esr (equivalent series resistance) ceramic type of a capacity at least 10 f for stable operation. c out can reduce ripple of output voltage, therefore as much as 10 f tantalum type is recommended. timing chart internal oscillator waveform internal operational amplifier output internal soft-start set voltage lx pin output soft-start time stable output short delay time of protection latched ce pin voltage output short the timing chart as shown above describes the waveforms starting from the ic is enabled with ce and latched with protection. during the soft-start time, until the level is rising up to the internal soft-start set voltage, the duty cycle of lx is gradually wider and wider to prevent the over-shoot of the voltage. during the term, the output of amplifier is ?h?, then after the output voltage reaches the set output voltage, they are balanced with the stable state. herein, if the output pin would be short circuit, the output of amplifier would become ?h? again, and the condition would continue for 1.5ms (typ.), latch circuit would work and the output of lx would be latched with ?off?. (output =?high-z?) if the output short is released before the latch circuit works (within 1.5ms after output shorted), the output of amplifier is balanced in the stable state again. once the ic is latched, to release the protection, input ?l? with ce pin, or make the supply voltage at uvlo level or less.
rev. 1.15 - 12 - typical characteristics 1) output voltage vs. output current 1.7 1.72 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 1.9 1 10 100 1000 output current i out [ma] output voltage v out [ma] vin=3.3v pwm vin=3.3v vfm vin=5.0v pwm vin=5.0v vfm r1230d181a 1.7 1.72 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 1.9 1 10 100 1000 output current i out [ma] output voltage v out [v] vin=3.3v pwm vin=3.3v vfm vin=5.0v pwm vin=5.0v vfm r1230d181b 2.4 2.45 2.5 2.55 2.6 1 10 100 1000 output current i out [ma] output voltage v out [v] vin=3.3v pwm vin=3.3v vfm vin=5.0v pwm vin=5.0v vfm r1230d251b 2) efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current i out [ma] efficiency [%] vin=3.3v pwm vin=3.3v vfm vin=5.0v pwm vin=5.0v vfm r1230d181a
rev. 1.15 - 13 - 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current i out [ma] efficiency [%] vin=3.3v pwm vin=3.3v vfm vin=5.0v pwm vin=5.0v vfm r1230d181b 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 output current i out [ma] efficiency[%] vin=3.3v pwm vin=3.3v vfm vin=5.0v pwm vin=5.0v vfm r1230d251b 3) ripple voltage vs. output current -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 -1.00e-06 0.00e+00 1.00e-06 2.00e-06 3.00e-06 4.00e-06 5.00e-06 6.00e-06 7.00e-06 8.00e-06 time [sec] output ripple voltage vripple[v] v in =5.0v i out =200ma pwm mode r1230d181a c out =10uf tantalum capacitor esr=400mohm 0 10 20 30 40 50 60 70 80 0 50 100 150 200 250 300 350 400 450 500 output current i out [ma] output ripple voltage vripple[v] v in =5.0v v in =3.3v r1230d181b c out =10 f tantalum capacitor esr=400m ?
rev. 1.15 - 14 - -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -1.00e-06 0.00e+00 1.00e-06 2.00e-06 3.00e-06 4.00e-06 5.00e-06 6.00e-06 7.00e-06 8.00e-06 time [sec] output ripple voltage vripple[v] v in =5.0v i out =200ma pwm mode r1230d181b c out =10uf ceramic capacitor esr=220mohm 4) output waveform -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 0.05 -4.00e-06 -3.00e-06 -2.00e-06 -1.00e-06 0.00e+00 1.00e-06 2.00e-06 3.00e-06 4.00e-06 time[sec] ac output voltage v ac [v] v in =5.0v i out =10ma pwm mode r1230d181b c out =10uf tantalum capacitor esr=400mohm -0.06 -0.05 -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -4.00e-06 -3.00e-06 -2.00e-06 -1.00e-06 0.00e+00 1.00e-06 2.00e-06 3.00e-06 4.00e-06 time[sec] ac output voltage v ac [v] v in =5.0v i out =100ma pwm mode r1230d181b c out =10uf tantalum capacitor esr=400mohm 5) output voltage vs. input voltage 1.7 1.75 1.8 1.85 1.9 22.533.544.555.56 input voltage v in [v] output voltage v out [v] pwm vfm r1230d181b i out =20ma
rev. 1.15 - 15 - 6) output voltage vs. temperature 1.7 1.72 1.74 1.76 1.78 1.8 1.82 1.84 1.86 1.88 1.9 -60 -40 -20 0 20 40 60 80 100 temperature topt output voltage v out [v] r1230d181b i out =100ma 0.7 0.75 0.8 0.85 0.9 -60 -40 -20 0 20 40 60 80 100 temperature topt output voltage v out [v] r1230d001c/d i out =100ma 7) oscillator frequency vs. temperature 300 400 500 600 700 800 900 1000 -60 -40 -20 0 20 40 60 80 100 temperature topt frequency f osc [khz] v in =v out +1.5v 8) supply current vs. temperature 100 170 240 310 380 450 -60 -40 -20 0 20 40 60 80 100 temperature topt supply current iss[ua] 800khz 500khz v in =5.5v ( c) ( c) ( c) ( c)
rev. 1.15 - 16 - 9) soft-start time vs. temperature 0 0.6 1.2 1.8 2.4 3 -60 -40 -20 0 20 40 60 80 100 temperature topt soft-start time tsoft[ms] 800khz 500khz r1230d181b v in =3.3v 10) delay time for protection vs. temperature 0 0.6 1.2 1.8 2.4 3 -60 -40 -20 0 20 40 60 80 100 temperature topt delay time for protection circuit tprc[ms] 11) uvlo threshold/released voltage vs. temperature 1.8 1.85 1.9 1.95 2 2.05 2.1 2.15 2.2 2.25 2.3 -60 -40 -20 0 20 40 60 80 100 temperature topt v dd voltage level[v] uvlo detector threshold uvlo released voltage 12) ce pin input voltage vs. temperature 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 -60 -40 -20 0 20 40 60 80 100 temperature topt ce input voltage v ce [v] cel ceh ( c) ( c) ( c) ( c)
rev. 1.15 - 17 - 13) mode pin input voltage vs. temperature 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 -60 -40 -20 0 20 40 60 80 100 temperature topt mode input voltage v mode [v] model modeh 14) duty cycle at vfm mode vs. temperature 50 55 60 65 70 75 80 -60 -40 -20 0 20 40 60 80 100 temperature topt duty cycle at vfm mode[%] 15) lx transistor on resistance vs. temperature 0 0.25 0.5 0.75 1 -60 -40 -20 0 20 40 60 80 100 temperature topt on resistance ron[ohm] nch tr. on resistance pch tr. on resistance v in =3.0v 16) limit voltage vs. temperature 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 -60 -40 -20 0 20 40 60 80 100 temperature topt limit voltage vlimit[v] ( c) ( c) ( c) ( c)
rev. 1.15 - 18 - 17) load transient response -4.00e-05 -2.00e-05 0.00e+00 2.00e-05 4.00e-05 6.00e-05 8.00e-05 1.00e-04 1.20e-04 1.40e-04 time[sec] load current 100ma/div -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 ac output v ac [v] i out =0a i out =100ma r1230d181b v in =5.0v pwm -4.00e-05 -2.00e-05 0.00e+00 2.00e-05 4.00e-05 6.00e-05 8.00e-05 1.00e-04 1.20e-04 1.40e-04 time[sec] load current100ma/div -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 output voltage v ac [v] i out =0a r1230d181b v in =5.0v pwm i out =200ma -4.00e-06 1.00e-06 6.00e-06 1.10e-05 1.60e-05 2.10e-05 2.60e-05 3.10e-05 3.60e-05 time [sec] load current 100ma/div -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 ac output voltage v ac [v] i out =0a r1230d181b v in =5.0v pwm i out =100ma -0.0002 -0.0001 0 0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 0.0007 0.0008 time [sec] load current 100ma/div -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 ac output voltage v ac [v] i out =2ma i out =100ma r1230d181b v in =5.0v pwm
rev. 1.15 - 19 - -4.00e-06 1.00e-06 6.00e-06 1.10e-05 1.60e-05 2.10e-05 2.60e-05 3.10e-05 3.60e-05 time[sec] load current 100ma/div -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 ac output voltage v ac [v] i out =0a r1230d181b v in =5.0v pwm i out =200ma -0.0002 -0.0001 0 0.0001 0.0002 0.0003 0.0004 0.0005 0.0006 0.0007 0.0008 time [sec] load current 100ma/div -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 ac output voltage v ac [v] i out =2ma i out =200ma r1230d181b v in =5.0v pwm 18) turn-on waveform -1 0 1 2 3 4 5 -0.0004 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 time [sec] output voltage v out [v] -10 -8 -6 -4 -2 0 2 4 ce input voltage v ce [v] ce v out r1230d181b v in =5.0v pwm mode i out =0a -1 0 1 2 3 4 5 -0.0004 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 time [sec] output voltage v out [v] -10 -8 -6 -4 -2 0 2 4 ce input voltage v ce [v] ce v out r1230d181b v in =5.0v pwm mode i out =50ma
rev. 1.15 - 20 - -1 0 1 2 3 4 5 -0.0004 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 time [sec] output voltage v out [v] -10 -8 -6 -4 -2 0 2 4 ce input voltage v ce [v] ce v out r1230d181b v in =5.0v pwm mode i out =200ma -1 0 1 2 3 4 5 -0.0004 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 time [sec] output voltage v out [v] -10 -8 -6 -4 -2 0 2 4 ce input voltage v ce (v) ce v out r1230d181b v in =5.0v vfm mode i out =0a -1 0 1 2 3 4 5 -0.0004 0 0.0004 0.0008 0.0012 0.0016 0.002 0.0024 0.0028 time [sec] output voltage v out [v] -10 -8 -6 -4 -2 0 2 4 ce input voltage v ce [v] ce v out r1230d181b v in =5.0v vfm mode i out =50ma

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