datashee t product structure silicon monolithic integrated circuit this product has not designed prot ection against radioactive rays . 1/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 tsz22111 ? 14 ? 001 www.rohm.com led drivers for lcd backlights 1ch boost up type white led driver for large lcd BD9413F 1.1 general description BD9413F is a high efficiency driver for white leds and is designed for large lcds. BD9413F has a boost dcdc converter that employs an a rray of leds as the light source. BD9413F has some protect functions against fault conditions, such as over-voltage protection (ovp), over current limit protection of dcdc (ocp), led ocp protection, and over boost protection (fbmax). therefore it is available for the fail-safe design over a wide range output voltage. features ? dcdc converter with current mode ? led protection circuit (over boost protection, led ocp protection) ? over-voltage protection (ovp) for the output voltage vout ? adjustable soft start ? adjustable oscillation frequency of dcdc ? wide range of analog dimming 0.2v to 3.0v ? uvlo detection for the input voltage of the power stage ? led dimming pwm over duty protection(odp) applications ? tv, computer display, lcd backlighting key specifications ? operating power supply volt age range: 9.0v to 35.0v ? oscillator frequency of dcdc: 150khz (rt=100k ? ) ? operating current: 3.3 ma(typ.) ? operating temperature range: -40c to +105c 1.2 package(s) w(typ) x d(typ) x h(max) sop18 11.20mm x 7.80mm x 2.01mm pin pitch 1.27mm figure 1. sop18 typical application circuit figure 2. typical application circuit ovp dimout gate isense cs vcc vin fb vcc gnd uvlo stb reg90 rt pwm ss adim failb vout rs dutyp dutyon
datasheet d a t a s h e e t 2/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BD9413F 1.3 pin configuration vcc 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 1 stb ovp uvlo ss dutyon pwm failb reg90 cs gate dimout gnd isense fb dutyp 9 adim 10 rt figure 3. pin configuration 1.4 pin descriptions no. C 1 vcc power supply pin 2 stb ic on/off pin 3 ovp over voltage protection detection pin 4 uvlo under voltage lock out detection pin 5 ss soft start setting pin 6 dutyon over duty protection on/off pin 7 pwm external pwm dimming signal input pin 8 failb error detection output pin 9 adim adim signal input pin 10 rt dc/dc switching frequency setting pin 11 dutyp over duty protection setting pin 12 fb error amplifier output pin 13 isense led current detection input pin 14 gnd - 15 dimout dimming signal output for nmos 16 gate dc/dc switching output pin 17 cs dc/dc output current detect pin, ocp input pin 18 reg90 9.0v output voltage pin
datasheet d a t a s h e e t 3/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BD9413F 1.5 block diagram figure 4. block diagram auto- restart control ovp dimout vreg gate isense cs rt pwm vcc reg90 gnd + - - control logic reg90 vin vcc uvlo tsd reg90 uvlo current sense osc ss pwm comp - + + error amp ledocp overboost 1.015v fb ss-fb clamper vcc package:sop18 reg90 adim rs ss stb 1/3 uvlo uvlo leb 1m ovp fail detect failb dutyp osc over duty protection dutyon 1m 1m
datasheet d a t a s h e e t 4/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BD9413F 1.6 absolute maximum ratings (ta=25c) parameter symbol rating unit power supply voltage vcc -0.3 to +36 v ss, rt, isense, fb, cs, dutyp pin voltage ss, rt, isense, fb, cs, dutyp -0.3 to +7 v reg90, dimout, gate pin voltage reg90, dimout, gate -0.3 to +13 v ovp, uvlo, pwm, adim, stb, failb, dutyon pin voltage ovp, uvlo, pwm, adim, stb, failb, dutyon -0.3 to +20 v power dissipation pd 0.69 (note 1) w operating temperature range topr -40 to +105 c junction temperature tjmax 150 c storage temperature range tstg -55 to +150 c (note 1) in the case of mounting 1 layer glass epoxy base-plate of 70mm70mm1.6mm, derate by 5.5mw/ c when operating above ta=25 c . 1.7 recommended operating ranges parameter symbol range unit power supply voltage vcc 9.0 to 35.0 v dc/dc oscillation frequency fsw 50 to 1000 khz effective range of adim signal vadim 0.2 to 3.0 v pwm input frequency fpwm 90 to 2000 hz 1.8 electrical characteristi cs 1/2 (unless otherwise specified vcc=24v ta=25c) parameter symbol min typ max unit conditions total current consumption circuit current icc 3.3 6.6 ma vstb=3.0v, pwm=3.0v circuit current (standby) ist 40 80 a vstb=0v uvlo block operation voltage vcc vuvlo_vcc 6.5 7.5 8.5 v vcc=sweep up hysteresis voltage vcc vuhys_vcc 150 300 600 mv vcc=sweep down uvlo release voltage vuvlo 2. 88 3.00 3.12 v vuvlo=sweep up uvlo hysteresis voltage vuhys 250 300 350 mv vuvlo=sweep down uvlo pin leak current uvlo_lk -2 0 2 a vuvlo=4.0v dc/dc block isense threshold voltage 1 vled1 0.225 0.233 0.242 v vadim=0.7v isense threshold voltage 2 vled2 0.656 0.667 0.677 v vadim=2.0v isense threshold voltage 3 vled3 0.988 1.000 1.012 v vadim=3.0v isense clamp voltage vled4 0.990 1.015 1.040 v vadim=3.3v (as masking analog dimming) oscillation frequency fct 142.5 150 157.5 khz rt=100k ? rt short protection range rt_det -0.3 - vrt 90% v rt=sweep down rt terminal voltage vrt 1.6 2.0 2.4 v rt=100k ? gate pin max duty output max_duty 90 95 99 % rt=100k ? gate pin on resistance (as source) ronso 2.5 5.0 10.0 ? gate pin on resistance (as sink) ronsi 2.0 4.0 8.0 ? ss pin source current i ssso -3.75 -3.0 -2.25 a vss=2.0v ss pin on resistance at off rss_l - 3.0 5.0 k ? soft start ended voltage vss_end 3.52 3.70 3.88 v ss=sweep up
datasheet d a t a s h e e t 5/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BD9413F 1.8 electrical char acteristics 2/2 (unless otherwise specified vcc=24v ta=25c) parameter symbol min typ max unit conditions dc/dc block fb source current ifbso -115 -100 -85 a visense=0.2v, vadim=3.0v, vfb=1.0v fb sink current ifbsi 85 100 115 a visense=2.0v, vadim=3.0v, vfb=1.0v dc/dc protection block ocp detect voltage vcs 360 400 440 mv cs=sweep up ocp latch off detect voltage vcs 0.85 1.00 1.15 v cs=sweep up ovp detect voltage vovp 2.88 3.00 3.12 v vovp sweep up ovp detect hysteresis vovp_hys 150 200 250 mv vovp sweep down ovp pin leak current ovp_lk -2 0 2 a vovp=4.0v, vstb=3.0v led protection block led ocp detect voltage vledocp 2.88 3.00 3.12 v visense=sweep up over boost detection voltage vfbh 3.84 4.00 4.16 v vfb=sweep up dimming block adim pin leak current iladim -2 0 2 a vadim=2.0v isense pin leak current il_isense -2 0 2 a visense=4.0v dimout source on resistance ronso 5.0 10.0 20.0 ? dimout sink on resist ance ronsi 4.0 8.0 16.0 ? reg90 block reg90 output voltage 1 reg90 _1 8.91 9.00 9.09 v io=0ma reg90 output voltage 2 reg 90_2 8.865 9.00 9.135 v io=-15ma reg90 available current | ireg90 | 15 - - ma reg90_uvlo detect voltage reg90_th 5.22 6.00 6.78 v vreg90=sweep down, vstb=0v reg90 discharge resistance reg90_dis 13.2 22.0 30.8 v stb=on->off, reg90=8.0v, pwm=l stb block stb pin high voltage stbh 2.0 - 18 v stb pin low voltage stbl -0.3 - 0.8 v stb pull down resistance rstb 600 1000 1400 k ? vstb=3.0v pwm block pwm pin high voltage pwm_h 1.5 - 18 v pwm pin low voltage pwm_l -0.3 - 0.8 v pwm pin pull down resistance rpwm 600 1000 1400 k ? vpwm=3.0v dutyon block dutyon pin high voltage dtyon_h 1.5 - 18 v dutyon pin low voltage dtyon_l -0.3 - 0.8 v dutyon pin pull down resistance rdtyon 600 1000 1400 k ? vdutyon=3.0v over duty protection block pwm odp protection detect duty dodp - 35 - % fpwm=120hz, dutyp=341k ? dutyp short protection range dtyp_det -0.3 - vdutyp 90% v dutyp=sweep down dutyp terminal voltage vdtyp 1.6 2.0 2.4 v dutyp=100k ? filter block abnormal detection timer tcp - 20 - ms fct=800khz auto timer tauto - 163 - ms fct=800khz failb block failb pin low voltage vfailb l 0.25 0.5 1.0 v ifail=1ma
datasheet d a t a s h e e t 6/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BD9413F 1.9 typical performance curves (reference data) figure 5. operating circuit current figure 6. standby circuit current figure 7. duty cycle vs fb character figure 8. isense feedback voltage vs adim character stb=3.0v pwm=3.0v ta=25c 0 10 20 30 40 50 60 70 80 10 15 20 25 30 35 vc c [v] istb[ua] stb=0v pwm=0v ta=25c 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 10 15 20 25 30 35 vc c [v] icc[ma] 0 20 40 60 80 100 01234 fb[v] duty cycle[%] vcc=24v ta=25c 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 01234 ad im[v] isense feecback voltage[v] vcc=24v ta=25c stb=3.0v pwm=3.0v ta=25c vcc=24v ta=25c
datasheet d a t a s h e e t 7/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BD9413F 2.1 pin descriptions pin 1: vcc this is the power supply pin of the ic. input range is from 9v to 35v. the operation starts at more than 7.5v(typ .) and shuts down at less than 7.2v(typ.). pin 2: stb this is the on/off setting terminal of the ic. input reset-signal to this terminal to reset ic from latch-off. at startup, internal bias starts at high level, a nd then pwm dcdc boost starts after pwm rise edge inputs. note: ic status (ic on/off) transits depending on the vo ltage inputted to stb terminal. avoid the use of intermediate level (from 0.8v to 2.0v). pin 3: ovp the ovp terminal is the input for over-voltage protection. if ovp is more than 3.0v(typ ), the over-voltage protection (ovp) will work. at the moment of thes e detections, it sets gate=l, dimout=l and starts to count up the abnormal interval. if ovp detection continued to count four gate clocks, ic reaches latch off. (please refer to ?3.5.5 timing chart?) the ovp pin is high impedance, because the internal resistance is not connected to a certain bias. even if ovp function is not used, pin bias is still required because the open connecti on of this pin is not a fixed potential. the setting example is separately described in the section ?3.2.7 ovp setting?. pin 4: uvlo under voltage lock out pin is the input voltage of the power st age. , ic starts the boost operat ion if uvlo is more than 3.0v(typ) and stops if lower than 2.7v(typ). the uvlo pin is high impedance, because the inter nal resistance is not connected to a certain bias. even if uvlo function is not used, pin bias is still required because the open connection of this pin is not a fixed potential. the setting example is separately described in the section ?3.2.5 uvlo setting? pin 5: ss this is the pin which sets the soft start interval of dc/ dc converter. it performs the constant current charge of 3.0 a(typ.) to external capacitance css. the switching duty of gate out put will be limited during 0v to 3.7v(typ.) of the ss voltage. so the soft start interval tss can be expressed as follows [sec] c . t ss ss ? ? ? 6 10 23 1 css: the external capacitance of the ss pin . the logic of ss pin asserts low is defined as the latch-off state or pwm is not input high level after stb reset release. when ss capacitance is under 1nf, take note if the in-rush curr ent during startup is too large, or if over boost detection (fbmax) mask timing is too short. please refer to soft start behavior in t he section ?3.5.4 timing chart ?. pin 6: dutyon this is the on/off setting terminal of the led pwm over duty protection (odp). by adjust ing dutyon input voltage, it is on/off of the odp adjusted. state dutyon input voltage odp=on dutyon= \ 0.3v~0.8v odp=off dutyon=1.5v~18.0v pin 7: pwm this is the pwm dimming signal input terminal. the high / low level of pwm pins are the following. state pwm input voltage pwm=h pwm=1.5v to 18.0v pwm=l pwm= \ 0.3v to 0.8v pin 8: failb this is failb signal output (open drain) pin. at normal operation, nmos will be open state, during abnormality detection nmos will be in on (500 ohm typ.) state.
datasheet d a t a s h e e t 8/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BD9413F adim[v] 0 3.0 1.0v gain=1/3 0.2 error amp vth[v] 67mv 1.015v pin 9: adim this is the input pin for analog dimming signal. the isense feed back point is set as 1/3 of this pin bias. if more than 3.0v(typ.) is input, isense feedback voltage is clamped to lim it to flow led large current. in this condition, the input current is caused. please refer to terminal explanation. pin 10: rt this is the dc/dc switching frequency setting pin. dcdc frequency is decided by connected resistor. the relationship between the frequency and rt resistance value (ideal) the oscillation setting ranges from 50khz to 1000khz. the setting example is separately described in the section ?3.2.4 dcdc oscillation frequency setting?. pin 11: dutyp this is the odp setting pin. the odp (over duty protecti on) is the function to limit duty of led pwm frequency f pwm by odp detection duty (odp duty ) set by resistance (r duty ) connected to dutyp pin. relationship between led pwm frequency f pwm , odp detection duty and dutyp resistance (ideal) the r dutyp setting ranges from 15k ? to 600k ? . the setting example is separately describ ed in the section ?3 .2.6 odp setting?. pin 12: fb this is the output terminal of error amplifier. fb pin rises with the same slope as the ss pin during the soft-start period. after soft -start completion (ss>3.7v (typ.)), it operates as follows. when pwm=h, it detects isense terminal voltage and outputs error signal compared to analog dimming signal (adim). when pwm=l, ic holds the ovp voltage at the edge of pwm= h to l, and operates to hold the adjacent voltage. please refer to section ?3 .5 timing chart?. it detects over boost (fbmax) over fb=4.0v(typ). after the ss completion, if fb>4.0v and pwm=h continues 4clk gate, the cp counter starts. after that, only the fb>4.0v is monitored, when cp c ounter reaches 16384clk (2 14 clk), ic will be latched off. (please refer to section ?3.5.6 timing chart?.) the loop compensation setting is described in section "3.4 loop compensation". pin 13: isense this is the input terminal for the current detection. error amplifier compares the lower one among 1/3 of the voltage terminal adim analog dimming and 3.0v(typ). and it detects abnormal led overcurrent at isense=3.0v(typ) over. if gate terminal continues during four clks (equivalent to 40us at fosc = 100khz), it becomes latch-off. (please refer to section ?3.5.7 timing chart?.) figure 9. relationship of the feedback voltage and adim figure 10. isense terminal circuit example pin 14: gnd this is the gnd pin of the ic. - + 1.015v vout isense fb error amp + dimout bd9413 1/3 adim rs ] k [ ] khz [ f r sw rt ? ? 15000 ] k [ ] hz [ f [%] odp r pwm duty dutyp ? ? ? 1172
datasheet d a t a s h e e t 9/33 tsz02201-0f2f0c100120-1-2 ? 2015 rohm co., ltd. all rights reserved. 28.dec.2015 rev.001 www.rohm.com tsz22111 ? 15 ? 001 BD9413F pin 15: dimout this is the output pin for external dimming nmos. the table below shows the rough output logic of each operation state, and the output h level is reg90. please refer to ?3.5 timing chart? for detailed explanations, because dimout logic has an exceptional behavior. please insert the resistor r dim between the dimming mos gate to improve the over shoot of led current, as pwm turns from low to high. status dimout output normal same logic to pwm abnormal gnd level pin 16: gate this is the output terminal for driving t he gate of the boost mosfet. the high level is reg90. frequency can be set by the resistor connected to rt. refer to |