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r1202x series step-up dc/dc converter with shutdown function no.ea-255-110404 1 outline the r1202x series are cmos-based pwm step-up dc/dc converter ics with low supply current. each of these ics consists of an nmos fet, npn transistor, an oscillator, a pwm comparator, a voltage reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (uvlo), an over-voltage protection circuit (ovp), a soft-start circuit, a maxduty lim it circuit, and a thermal shutdown protection circuit. by simply using an inductor, a resistor, and capacitors as external components, a hi gh-efficiency step-up dc/dc converter can be easily configured. at the standby mode, a rectifier transistor can separate the output from the input. the r1202x series include a thermal shut-down circui t and an under-voltage lockout circuit (uvlo) which separate the output from the input to shut down the cu rrent when the over heat caused when the output is connected to the gnd is detected and also during the uv lo detection. as other protection functions, the r1202x series contain a cycle by cycle current limit circuit that limits the lx peak current, and an over-voltage protection circuit (ovp) that detects the output overvoltage. the r1202x series offer three versions: the r1202xxxxa /b versions, which are optimized for constant-voltage power supply and the r1202xxxxd version, which is optimiz ed to drive serial white leds with constant current. while the r1202xxxxa version discharges the v out output to 0v at the shutdown, the r1202xxxxb version doesn?t. the brightness of the white leds can be adjusted quickly by applying a pwm signal (200hz to 300khz) to the ce pin. the r1202x series are available in df n1616-6b and tsot -23-6 packages. features ? input voltage rang e .........................................2.3v to 5. 5v (r1202xxxxa/b) 1.8v to 5.5v (r1202xxxxd) ? supply curre nt ................................................. typ. 800 a ? standby curr ent ............................................... max. 5 a ? feedback vo ltage ............................................ 1.0v 15mv (r1202xxxxa/b) 0.2v 10mv (r1202xxxxd) ? oscillator frequen cy ........................................ typ. 1.2mhz ? maximum duty cycle ....................................... typ. 91% ? uvlo function ............................................... typ.2.0v (hys.typ.0.2v) (r1202xxxxa/b) typ.1.6v (hys.typ.0.1v) (r1202xxxxd) ? lx current limit function ................................. select from 350ma, 700ma ? over voltage protection ................................... select from 14v-23v (ref er the selection guide) ? led dimming control for r1202xxxxd............. by external pwm signal (frequency 200hz to 300khz) ? thermal protection functi on .......................... typ.150oc(hy s.typ.50oc) ? built-in auto discharge function...................... r1202xxxxa ? nmos on resistance ..................................... 1.35 ? ? packages ......................................................... dfn161 6-6b, tsot-23-6
r1202x 2 application ? constant voltage power source for portable equipment ? oled power supply for portable equipment ? white led backlight for portable equipment block diagrams r1202xxxxa l x v out switch control ce v fb g nd v in ce vre f oscillato r + ? + ? uvlo current sense current limit drive r control s r q err. amp. pwm comp. ovp soft-start thermal shutdown
r1202x 3 l x v out r1202xxxxb r1202xxxxd l x g nd ce v out shutdown delay en pwm cntrl ce slope com- pensation v fb v in vre f oscillato r + ? + ? uvlo current sense current limit drive r control s rq err. amp. pwm comp. o v p thermal shutdown switch control switch control ce v fb g nd v in ce vre f oscillato r + ? + ? uvlo current sense current limit drive r control s rq err. amp. pwm comp. ovp soft-start thermal shutdown
r1202x 4 selection guide the ovp threshold voltage, current limit, package and v fb /auto discharge are user-selectable options. product name package quantity per reel pb free halogen free r1202lyz1 ? -tr dfn1616-6b 5,000 pcs yes yes r1202nyz3 ? -tr-fe tsot-23-6 3,000 pcs yes yes y : designation of ovp threshold (3) 14v : r1202xxxxa/b/d (4) 17v : r1202xxxxa/b (5) 19v : r1202xxxxa/b (6) 21v : r1202xxxxa/b (7) 23v : r1202xxxxa/b/d z : designation of current limit (1) 350ma (2) 700ma ? : designation of vfb, auto discharge function vfb auto discharge a 1.0v b 1.0v d 0.2v auto-discharge function quickly lowers the output voltage to 0v, when the chip enable signal is switched from the active mode to the standby mode, by releasing the electrical charge accumulated in the external capacitor.
r1202x 5 pin configurations ? dfn1616-6b ? tsot-23-6 top view 3 4 2 5 1 6 bottom view 1 6 2 5 3 4 ? 6 5 4 12 3 (mark side) pin descriptions ? dfn1616-6b pin no symbol pin description 1 ce chip enable pin ("h" active) 2 v fb feedback pin 3 l x switching pin (open drain output) 4 gnd ground pin 5 v in input pin 6 v out output pin ? ) the tab is substrate level (gnd). the tab is better to be con nected to the gnd, but leaving it open is also acceptable. ? tsot-23-6 pin no symbol pin description 1 ce chip enable pin ("h" active) 2 v out output pin 3 v in input pin 4 l x switching pin (open drain output) 5 gnd ground pin 6 v fb feedback pin
r1202x 6 absolute maximum ratings (gnd=0v) symbol item rating unit v in v in pin voltage -0.3 to 6.5 v v ce ce pin voltage -0.3 to 6.5 v v fb v fb pin voltage -0.3 to 6.5 v v out v out pin voltage -0.3 to 25 v v lx l x pin voltage -0.3 to 25 v i lx l x pin current 1000 ma power dissipation (dfn1616-6b) ? 640 p d power dissipation (tsot-23-6) ? 460 mw t a operating temperature range -40 to 85 c t stg storage temperature range -55 to 125 c ? ) for power dissipation, please refer to package information. absolute maximum ratings electronic and mechanical stress momentarily ex ceeded absolute maximum ratings may cause the permanent damages and may degrade the life time and safety for both device and system using the device in the field. the functional operation at or ov er these absolute maximum ratings is not assured. recommended operating conditions (electrical characteristics) all of electronic equipment should be designed that the mounted semiconductor devices operate within the recommended operating conditions. the semiconductor devices cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by momentary electronic noise or surge. and the semiconduc tor devices may receive serious damage when they continue to operate over the recommended operating conditions.
r1202x 7 electrical characteristics ? r1202x (ta=25 c) symbol item conditions min. typ. max. unit r1202xxxxa/b 2.3 5.5 v v in operating input voltage r1202xxxxd 1.8 5.5 v i dd supply current v in =5.5v , v fb =0v , l x at no load 0.8 1.2 ma i standby standby current v in =5.5v , v ce =0v 1.0 5.0 a r1202xxxxa/b 1.9 2.0 2.1 v v uvlo1 uvlo detect threshold voltage v in falling r1202xxxxd 1.5 1.6 1.7 v r1202xxxxa/b v uvlo1 +0.2 2.3 v v uvlo2 uvlo release voltage v in rising r1202xxxxd v uvlo1 +0.1 1.8 v v ceh ce input voltage "h" v in =5.5v 1.5 v v cel ce input voltage "l" 0.5 v r ce ce pull down resistance 1200 k ? r1202xxxxa/b 0.985 1.000 1.015 v fb v fb voltage accuracy v ce =3.6v r1202xxxxd 0.19 0.2 0.21 v ? v fb / ? ta v fb voltage temperature coefficient v ce =3.6v, -40 c < = < = c 150 ppm/ c i fb v fb input current v in =5.5v, v fb =0v or 5.5v -0.1 0.1 a t start soft-start time *r1202xxxxa/b 2.0 ms r on driver on resistance v ce =3.6v, i lx =100ma 1.35 ? i off driver leakage current v lx =22v 3.0 a r1202xx1xx 250 350 450 i lim driver current limit v in = 3.6v r1202xx2xx 500 700 900 ma v f npn forward voltage i lx =100ma 0.8 v i swoff1 npn leakage current 1 v out =22v, v lx =0v 10 a i swoff2 npn leakage current 2 v out =0v, v lx =5.5v 3 a f osc oscillator frequency v in = 3.6v, v fb = 0v 1000 1200 1400 khz
r1202x 8 ( (ta=25oc) symbol item conditions min. typ. max. unit m axduty maximum duty cycle v in =3.6v, v fb =0v 86 91 % r1202x3xxa/b/d 13.2 14 14.8 r1202x4xxa/b 16.2 17 17.8 r1202x5xxa/b 18.2 19 19.8 r1202x6xxa/b 20.2 21 21.8 v ovp1 ovp detect voltage v in =3.6v, v out rising r1202x7xxa/b/d 22.2 23 23.8 v r1202x3xxa/b/d v ovp1 -1.1 r1202x4xxa/b v ovp1 -1.3 r1202x5xxa/b v ovp1 -1.4 r1202x6xxa/b v ovp1 -1.5 v ovp2 ovp release voltage v in =3.6v, v out falling r1202x7xxa/b/d v ovp1 -1.7 v t tsd thermal shutdown detect temperature v in =3.6v 150 c t tsr thermal shutdown release temperature v in =3.6v 100 c
r1202x 9 typical applications r1202xxxxa/b r1202xxxxd recommended inductors l1 ( h) parts no rated current(ma) size(mm) 10 lqh32cn100k53 450 3.22.51.55 10 lqh2mc100k02 225 2.01.60.9 10 vlf3010a-100 490 2.82.60.9 20 lqh32cn220k53 250 3.22.51.55 20 lqh2mc220k02 185 2.01.60.9 20 vlf3010a-220 330 2.82.60.9 recommended components for r1202xxxxa/b rated voltage(v) part no. c1 6.3 cm105b105k06 c2 25 grm21br11e105k c3 25 220pf r1 for v out setting r2 for v out setting r3 2k ? recommended components for r1202xxxxd rated voltage(v) part no. c1 6.3 cm105b105k06 c2 25 grm21br11e224 v in l x v fb v out gnd ce c1 1 h~22 h c2 1 f v in l x v fb v out gnd ce c2 0.22 f c1 1 f r1 10 ? l1 10 h~22 h
r1202x 10 z the method of output voltage setting ( r1202xxxxa/b ) the output voltage (v out ) can be calculated with divider resistors (r 1 and r2) values as the following formula: output voltage (v out ) = v fb (r1 + r2) / r1 the total value of r1 and r2 should be equal or less than 300k . make the v in and gnd line sufficient. the large current flows through the v in and gnd line due to the switching. if this impedance (v in and gnd line) is high, the internal voltage of the ic may shift by the switching current, and the operating may become unstable. moreover, when the built-in l x switch is turn off, the spike noise c aused by the inductor may be generated. as a result of this, recommendation voltage rating of capacitor (c2) value is equal 1.5 times larger or more than the setting output voltage. ? led current setting ( r1202xxxxd ) when ce pin input is "h" (duty=100%), led cu rrent can be set with feedback resistor (r1) i led = v fb / r1 ? led dimming control ( r1202xxxxd ) the led brightness can be controlled by inputting the pwm signal to the ce pin. if the ce pin input is "l" in the fixed time (typ.0.5ms), the ic becom es the standby mode and turns off leds. the current of leds can be controlled by duty of the pwm signal of the input ce pin. the current of leds when high-duty of the ce input is "hduty" reaches the value as calculatable following formula. i led = hduty v fb / r1 the frequency of the pwm signal is using the range between 200hz to 300khz. when controlling the led brightness by the pwm signal of 20khz or less, the increasing or decreasing of the inductor current might be make a sounds in the hearabl e sound wave area. in that case, please use the pwm signal in the high frequency area.
r1202x 11 ce v fb r1 hduty dimming control by ce pin input ? soft-start ( r1202xxxxa/b ) the output and referrence of the error amplifier start from 0v and the referrence gradually rises up to 1.0v. after the softstart time (t ss ), output voltage rise up to the setting voltage. z shutdown at standby mode, the output is comp letely separated from the input and shutdown by the npn transistor of internal ic. however, the leakage current is generated when the l x pin voltage is higher than v in pin voltage at standby mode. r1202xxxxa (with auto discharge function): in the term of standby m ode, the switch between v out to gnd is turned on and output capacitor is discharged. ? protect function if the over current is detected, internal mosfet will tu rn-off soon. at the next operating period, mosfet will turn-on again and continue to watch the current. the uvlo function and the thermal shutdown function are turned off the nmos-driver and npn-transister when the v in decreases more than the uvlo detect threshold voltage or the inside of ic exceeds the thermal shutdown detect temperature, and reset ic when the v in rises more than the uvlo release voltage or the inside of ic falls below the thermal shutdown rele ase temperature, and restart the operation. z selection of inductor the peak current of the inductor at normal mode can be calculated as next formula: il max = 1.25 i led v out / v in + 0.5 v in (v out - v in ) / (l v out f osc ) when the start-up or dimming control by ce pin, transi ent current flows, the peak current must be equal or less than the current limit of the ic. the peak current sh ould not beyond the rating current of the inductor. the recommended inductance value is 10 h - 22 h.
r1202x 12 z selection of capacitor set 1 f or more value bypass capacitor c1 between v in pin and gnd pin as close as possible. as for r1202xxxxa/b version set 1.0 f ? 4.7 f capacitor c2 between v out pin and gnd pin. as for r1202xxxxd version, set 0.22 f ? 1.0 f capacitor c2 between v out pin and gnd pin. z external components setting if the spike noise of v out may be large for r1202xxxxa/b, the sp ike noise may be picked into v fb pin and make the operation unstable. in this case, use a r3 of the resistance value in the range from 1k to 5k to reduce a noise level of v fb .
r1202x 13 operation of step-up dc/dc converter and output current l diode cl lx tr v in v out i out i2 i1 gnd v out discontinuous mode continuous mode ilmax ilmin ton toff t=1/fosc topen il t ilmax ilmin ton toff t=1/fosc il iconst t there are two operation modes of the step-up pwm control- dc/dc converter. that is the continuous mode and discontinuous mode by the continuousness inductor. when the transistor turns on, the voltage of inductor l becomes equal to v in voltage. the increase value of inductor current (i1) will be i1 = v in t on / l .................................................................................................. fo rmula 1 as the step-up circuit, during the off time (when the tran sistor turns off) the voltage is continually supply from the power supply. the decrease val ue of inductor curr ent (i2) will be ? i2 = (v out - v in ) t open / l................................................................................... fo rmula 2 at the pwm control-method, the inductor current become continuously when t open = t off , the dc/dc converter operate as the continuous mode.
r1202x 14 in the continuous mode, the variation of current of i1 and i2 is same at regular condition. v in t on / l = (v out - v in ) t off / l ..........................................................................fo rmula 3 the duty at continuous mode will be duty (%)= t on / (t on + t off ) = (v out - v in ) / v out .........................................................form ula 4 the average of inductor current at tf = t off will be il1(ave.) = v in t on / (2 l) .................................................................................fo rmula 5 if the input voltage = output voltage, the i out will be i out = v in 2 t on / (2 l v out )...............................................................................form ula 6 if the i out value is large than above the calculated value (formu la 6), it will become the continuous mode, at this status, the peak current (il max ) of inductor will be il max = i out v out / v in + v in t on / (2 l ) il max = i out v out / v in + v in t (v out - v in ) / (2 l v out )...............................form ula 7 the peak current value is larger than the i out value. in case of this, selecting the condition of the input and the output and the external components by considering of il max value. the explanation above is based on the ideal ca lculation, and the loss caused by l x switch and the external components are not included. the actual maximum output current will be between 50% and 80% by the above calcul ations. especially, when the il is large or v in is low, the loss of v in is generated with on resistance of the switch. moreover, it is necessary to consider v f of the diode (approximately 0.8v) about v out .
r1202x 15 typical characteristics 1) efficiency vs. output current (r1202n723a) v out =10v, l=10 h (lqh32cn100k53) v out =10v, l=22 h (lqh32cn220k53) 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v v out =15v, l=10 h(lqh32cn100k53) v out =15v, l=22 h (lqh32cn220k53) 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v v out =20v, l=10 h (lqh32cn100k53) v out =20v, l=22 h (lqh32cn220k53) 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v
r1202x 16 v out =20v, v in =3.6v 50 55 60 65 70 75 80 85 0 5 10 15 20 output current (ma) efficiency (%) lqh32cn100k53l(3.22.51.55) vlf3010at-100mr33(3.02.81.0) lqh2mcn100k02(2.01.60.9) 2) efficiency vs. output current (r1202n713a) 4led, l=10 h (lqh32cn100k53) 4led, l=22 h (lqh32cn220k53) 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current iled (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current iled (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v 5led, l=10 h (lqh32cn100k53) 5led, l=22 h (lqh32cn220k53) 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current iled (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v 50 55 60 65 70 75 80 85 90 0 5 10 15 20 output current iled (ma) efficiency (%) vin=3v vin=3.6v vin=4.2v vin=5v
r1202x 17 3) efficiency vs. output current (r1202n713b) 5led, v in =3.6v 50 55 60 65 70 75 80 85 0 5 10 15 20 output current iled (ma) efficiency (%) lqh32cn100k53l(3.22.51.55) vlf3010at-100mr33(3.02.81.0) lqh2mcn100k02(2.01.60.9) 4) output voltage vs. output current (r1202n723a) v out =10v, l=10 h (lqh32cn100k53) v out =10v, l=22 h (lqh32cn220k53) 9.6 9.8 10 10.2 10.4 10.6 10.8 0 50 100 150 200 output c urrent (ma) output voltage (v) vin=3v vin=3.6v vin=4.2v vin=5v 9.6 9.8 10 10.2 10.4 10.6 10.8 0 50 100 150 200 output c urrent (ma) output voltage (v) vin=3v vin=3.6v vin=4.2v vin=5v v out =15v, l=10 h (lqh32cn100k53) v out =15v, l=22 h (lqh32cn220k53) 14 14.4 14.8 15.2 15.6 16 16.4 0 306090120 output current (ma) output voltage (v) vin=3v vin=3.6v vin=4.2v vin=5v 14 14.4 14.8 15.2 15.6 16 16.4 0 30 60 90 120 output current (ma) output voltage (v) vin=3v vin=3.6v vin=4.2v vin=5v
r1202x 18 v out =20v, l=10 h (lqh32cn100k53) v out =20v, l=22 h (lqh32cn220k53) 19.4 19.7 20 20.3 20.6 20.9 21.2 0 255075100 output current (ma) output voltage (v) vin=3v vin=3.6v vin=4.2v vin=5v 19.4 19.7 20 20.3 20.6 20.9 21.2 0 20 40 60 80 100 output current (ma) output voltage (v) vin=3v vin=3.6v vin=4.2v vin=5v v out =20v, v in =3.6v 19.5 19.7 19.9 20.1 20.3 20.5 0 1020304050 output current (ma) output voltage (v) lqh32cn100k53l (3.22.51.55) vlf3010at-100mr33 (2.82.60.9) lqh2mcn100k02 (2.01.60.9) 5) maxduty vs. iled 6) ovp output waveform r1202n713b r1202n713d 0 5 10 15 20 25 0 20 40 60 80 100 duty (%) iled (ma) 200hz 10khz 300khz 20 21 22 23 24 25 -50 -30 -10 10 30 50 time (ms) output voltage (v)
r1202x 19 7) waveform (5led) r1202n713d (ce freq=200hz) r1202n713d (ce freq=10khz) -5 0 5 10 15 20 -10 -5 0 5 10 time (ms) output voltage (v) ce voltage (v) -35 -20 -5 10 25 40 55 iled (ma) vout ce ile d -5 0 5 10 15 20 -500 -250 0 250 500 time (s) output voltage (v) ce voltage (v) -35 -20 -5 10 25 40 55 iled (ma) vout ce ile d r1202n713d (ce freq=300khz) -5 0 5 10 15 20 -1 -0.5 0 0.5 1 time [s] output voltage (v) ce voltage (v) -35 -20 -5 10 25 40 55 iled (ma) vout ce ile d 8) diode forward voltage vs. temperature 9) supplay currentlin vs. temperature 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 -40 -15 10 35 60 85 temperature ta (c) diode forward voltage (v) 0 100 200 300 400 500 600 700 800 900 1000 -40 -15 10 35 60 85 temperature ta (c) supplay current iin[a]
r1202x 20 10) uvlo voltage vs. temperature r1202xxxxa/b r1202xxxxd 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 -40 -15 10 35 60 85 temperature ta (c) uvlo voltage (v) 1.45 1.50 1.55 1.60 1.65 1.70 1.75 -40 -15 10 35 60 85 temperature ta (c) uvlo voltage(v) 11) vfb voltage vs. temperature r1202xxxxa/b r1202xxxxd 0.950 0.970 0.990 1.010 1.030 1.050 -40 -15 10 35 60 85 temperature ta (c) vfb voltage (v) 0.190 0.192 0.194 0.196 0.198 0.200 0.202 0.204 0.206 0.208 0.210 -40 -15 10 35 60 85 temperature ta (c) vfb voltage (v) 12) switch on resistance ron vs. temperature 13) ovp voltage vs. temperature r1202x7xxx 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 -40 -15 10 35 60 85 temperature ta (c) switch on resistance ron ( ? ) 19 20 21 22 23 24 25 -40 -15 10 35 60 85 temperature ta (c) ovp voltage (v) ovp detect ovp release
r1202x 21 14) lx limit current vs. temperature r1202xx1xx r1202xx2xx 200 250 300 350 400 450 500 -40 -15 10 35 60 85 temperature ta (c) lx limit current (ma) vin=2.8v vin=3.6v vin=5.5v 500 550 600 650 700 750 800 850 900 -40 -15 10 35 60 85 temperature ta (c) lx limit current (ma) vin=2.8v vin=3.6v vin=5.5v 15) frequency fosc vs. temperature 16) maxduty vs. temperature 1000 1050 1100 1150 1200 1250 1300 1350 1400 -40 -15 10 35 60 85 temperature ta (c) frequency fosc (khz) vin=1.8v vin=3.6v vin=5.5v 84 86 88 90 92 94 96 98 100 -40 -15 10 35 60 85 temperature ta (c) mxduty (%) vin=1.8v vin=3.6v vin=5.5v 17) thermal shutdown detect / release temperature vs. input voltage 60 80 100 120 140 160 180 200 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 v in (v) temperature (c) thermal shutdown detect thermal shutdown release
r1202x 22 18) inductor current (output-gnd short) 5led(v in =3v) 5led(v in =3v) r1202n713d r1202n723d 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 -5 -4 -3 -2 -1 0 1 2 3 4 5 time (s) inductor current (a) il 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -5 -4 -3 -2 -1 0 1 2 3 4 5 time (s) inductor current (a) il 5led(v in =3.6v) 5led(v in =3.6v) r1202n713d r1202n723d 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 -5 -4 -3 -2 -1 0 1 2 3 4 5 time (s) inductor current (a) il 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -5 -4 -3 -2 -1 0 1 2 3 4 5 time (s) inductor current (a) il 5led(v in =4.2v) 5led(v in =4.2v) r1202n713d r1202n723d 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 -5 -4 -3 -2 -1 0 1 2 3 4 5 time (s) inductor current (a) il 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -5 -4 -3 -2 -1 0 1 2 3 4 5 time (s) inductor current (a) il
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