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_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. triple high-voltage scan driver for tft lcd MAX17120 general description the MAX17120 includes three high-voltage level-shifting scan drivers for tft panel integrated gate logic. each scan driver has two channels that switch complementarily. the scan-driver outputs swing from +40v to -30v and can swiftly drive capacitive loads. to save power, the scan-drivers complementary outputs share the charge of their capacitive load before they change states. the MAX17120 is available in a 32-pin, 5mm x 5mm thin qfn package with a maximum thickness of 0.8mm for ultra-thin lcd panels. applications notebook computer displays lcd monitor and small tv panels features s +40v to -30v output swing range s fast slew rate for high capacitive load s load charge sharing for power saving s 32-pin, 5mm x 5mm thin qfn package 19-4809; rev 0; 8/09 ordering information pin configuration simplified operating circuit evaluation kit available part temp range pin-package MAX17120etj+ -40 c to +85 c 32 tqfn 32 31 30 29 28 27 26 9 1 0 1 1 1 2 1 3 1 4 1 5 18 19 20 21 22 23 24 7 6 5 4 3 2 1 MAX17120 tqfn 5mm x 5mm top view ckvb2 ckvbcs2 n.c. ckv3 ckvcs3 ckvbcs3 ckvb3 8 stvp ckvcs2 ckv2 n.c. ckvb1 ckvbcs1 ckvcs1 ckv1 25 gnd von n.c. voff n.c. vdd dish n.c. 17 dly n.c. cpv3 16 en cpv2 cpv1 n.c. stv gnd + v vdd = 3.3v ckvb1 ckvbcs1 ckvcs1 ckv1 von gnd voff stv cpv1 cpv2 cpv3 en dly gnd dish vdd ckvb2 ckvbcs2 ckvcs2 ckv2 stvp ckvb3 ckvbcs3 ckvcs3 ckv3 v von = 25v v goff = -15v n.c. n.c. n.c. n.c. n.c. n.c. equivalent load of display panel t-con stv cpv3 cpv2 en cpv1 MAX17120 www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 2 ______________________________________________________________________________________ stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. vdd to gnd ............................................................ -0.3v to +4v cpv1, cpv2, cpv3, stv, en to gnd ..................... -0.3v to +4v dly to gnd ............................................. -0.3v to (v vdd + 0.3v) dish to gnd .............................................. -6v to (v vdd + 0.3v) von to gnd .......................................................... -0.3v to +45v voff to gnd ........................................................ -35v to +0.3v von to voff ...................................................................... +65v ckv1, ckv2, ckv3, ckvb1, ckvb2, ckvb3 to voff .................................. -0.3v to (v von + 0.3v) stvp to voff ......................................... -0.3v to (v von + 0.3v) ckvcs1, ckvcs2, ckvcs3 to voff ... -0.3v to (v von + 0.3v) ckvbcs1, ckvbcs2, ckvbcs3 to voff .............................. -0.3v to (v von + 0.3v) continuous power dissipation (t a = +70 n c) 32-pin 5mm x 5mm thin qfn (derate 34.5mw/ n c above +70 n c) ........................ 2758.6mw operating temperature range .......................... -40 n c to +85 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c electrical characteristics (v vdd = v en = +3.3v, v von = 25v, v voff = -15v, stv = cpv1 = cpv2 = cpv3 = gnd, t a = 0 n c to +85 n c , unless otherwise noted. typical values are at t a = +25 n c.) absolute maximum ratings parameter conditions min typ max units vdd input-voltage range 2.2 3.6 v vdd uv lockout rising, hysteresis = 150mv 2 2.15 v vdd quiescent current v en = 3.3v 500 750 f a en = gnd 500 750 thermal shutdown rising edge, hysteresis = 15 n c 160 n c von input-voltage range 15 40 v von supply current v en = 3.3v 300 600 f a en = gnd 300 600 voff input-voltage range -30 -3 v voff supply current v en = 3.3v 200 350 f a en = gnd 200 350 von-to-voff voltage range 65 v von uv lockout von rising 12 13 v von falling 10 11 ckv_, ckvb_ output low i(ckv_) = -20ma 5 10 i ckv_, ckvb_ output high i(ckv_) = 20ma 9 18 i cpv_ rising to ckv_ rising t r , figure 4, v stv = 0v 100 150 ns cpv_ rising to ckv_ falling t f , figure 4, v stv = 0v 100 150 ns cpv_ rising to ckvb_ rising t r , figure 4, v stv = 0v 100 150 ns cpv_ rising to ckvb_ falling t f , figure 4, v stv = 0v 100 150 ns cpv_ falling to ckvcs_ rising t csr , figure 4, v stv = 0v 130 180 ns cpv_ falling to ckvcs_ falling t csf , figure 4, v stv = 0v 130 180 ns cpv_ falling to ckvcbs_ rising t csr , figure 4, v stv = 0v 130 180 ns cpv_ falling to ckvbcs_ falling t csf , figure 4, v stv = 0v 130 180 ns www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 _______________________________________________________________________________________ 3 electrical characteristics (continued) (v vdd = v en = +3.3v, v von = 25v, v voff = -15v, stv = cpv1 = cpv2 = cpv3 = gnd, t a = 0 n c to +85 n c , unless otherwise noted. typical values are at t a = +25 n c.) parameter conditions min typ max units ckv_, ckvb_ slew rate rising stv = gnd, c load = 15nf, r load = 100 i , 15% to 85% (note 1) 100 1000 v/ f s stv = gnd, c load = 4.7nf, 20% to 80% 100 160 ckv_, ckvb_ slew rate falling stv = gnd, c load = 15nf, r load = 100 i , 85% to 15% (note 1) 100 1000 v/ f s stv = gnd, c load = 4.7nf, 80% to 20% 100 160 ckv_, ckvb_ slew rate rising stv = vdd, c load = 15nf, r load = 100 i , 15% to 85% (note 1) 100 1000 v/ f s stv = vdd, c load = 4.7nf, 20% to 80% 100 160 ckv_, ckvb_ slew rate falling stv = vdd, c load = 15nf, r load = 100 i , 85% to 15% (note 1) 100 1000 v/ f s stv = vdd, c load = 4.7nf, 80% to 20% 100 160 three-state output current ckv = midsupply -1 +1 f a ckvcs-to-ckvbcs_ resistance i(ckvcs to ckvcsb) = 10ma 40 100 i stvp output low i(stvp) = -20ma 17 35 i stvp output high i(stvp) = 20ma 40 70 i stv rising to stvp rising t pr 120 200 ns stv falling to stvp falling t pf 120 200 ns stvp slew rate rising c load = 4.7nf 20 30 v/ f s stvp slew rate falling c load = 4.7nf 20 30 v/ f s cpv_ input frequency 85 khz input low voltage cpv_, stv, en, 2.2v < v vdd < 3.6v 0.8 v input high voltage cpv_, stv, en, 2.2v < v vdd < 3.6v 2 v input hysteresis cpv_, stv, en 250 mv input bias current v stv_ = 0v or v vdd ; v cpv_ = 0v or v vdd -1 +1 f a dish low voltage -1.5 v dish high voltage -0.5 v dish input impedance v dish = -2v 300 600 k i dish switch resistance v dish = -2v 200 500 i v dish = 0v 1 m i dly output current dly = gnd 3 4 5 f a dly sink current en = gnd, v dly = 0.4v 5 8 ma dly enable threshold rising 1.60 1.65 1.70 v startup delay c(dly) = 0.1 f f 40 ms www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 4 ______________________________________________________________________________________ electrical characteristics (v vdd = v en = +3.3v, v von = 25v, v voff = -15v, stv = cpv1 = cpv2 = cpv3 = gnd, t a = -40 n c to +85 n c , unless otherwise noted.) (note 2) parameter conditions min typ max units vdd input-voltage range 2.2 3.6 v vdd uv lockout rising, hysteresis = 150mv 2.15 v vdd quiescent current v en = 3.3v 750 f a en = gnd 750 von input-voltage range 15 40 v von supply current v en = 3.3v 600 f a en = gnd 600 voff input-voltage range -30 -3 v voff supply current v en = 3.3v 350 f a en = gnd 350 von-to-voff voltage range 65 v von uv lockout von rising 13 v von falling 10 ckv_, ckvb_ output low i(ckv_) = -20ma 10 i ckv_, ckvb_ output high i(ckv_) = 20ma 18 i cpv_ rising to ckv_ rising t r , figure 4, v stv = 0v 150 ns cpv_ rising to ckv_ falling t f , figure 4, v stv = 0v 150 ns cpv_ rising to ckvb_ rising t r , figure 4, v stv = 0v 150 ns cpv_ rising to ckvb_ falling t f , figure 4, v stv = 0v 150 ns cpv_ falling to ckvcs_ rising t csr , figure 4, v stv = 0v 180 ns cpv_ falling to ckvcs_ falling t csf , figure 4, v stv = 0v 180 ns cpv_ falling to ckvcbs_ rising t csr , figure 4, v stv = 0v 180 ns cpv_ falling to ckvbcs_ falling t csf , figure 4, v stv = 0v 180 ns ckv_, ckvb_ slew rate rising stv = gnd, c load = 15nf, r load = 100 i , 15% to 85% (note 2) 100 v/ f s stv = gnd, c load = 4.7nf, 20% to 80% 100 ckv_, ckvb_ slew rate falling stv = gnd, c load = 15nf, r load = 100 i , 85% to 15% (note 2) 100 v/ f s stv = gnd, c load = 4.7nf, 80% to 20% 100 ckv_, ckvb_ slew rate rising stv = vdd, c load = 15nf, r load = 100 i , 15% to 85% (note 2) 100 v/ f s stv = vdd, c load = 4.7nf, 20% to 80% 100 www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 _______________________________________________________________________________________ 5 electrical characteristics (continued) (v vdd = v en = +3.3v, v von = 25v, v voff = -15v, stv = cpv1 = cpv2 = cpv3 = gnd, t a = -40 n c to +85 n c , unless otherwise noted.) (note 2) note 1: guaranteed by design, not production tested. note 2: limits are 100% production tested at t a = +25 n c. maximum and minimum limits over temperature are guaranteed by design and characterization. parameter conditions min typ max units ckv_, ckvb_ slew rate falling stv = vdd, c load = 15nf, r load = 100 i , 85% to 15% (note 2) 100 v/ f s stv = vdd, c load = 4.7nf, 80% to 20% 100 ckvcs-to-ckvbcs_ resistance i(ckvcs to ckvcsb_) = 10ma 100 i stvp output low i(stvp) = -20ma 35 i stvp output high i(stvp) = 20ma 70 i stv rising to stvp rising t pr 200 ns stv falling to stvp falling t pf 200 ns stvp slew rate rising c load = 4.7nf 20 v/ f s stvp slew rate falling c load = 4.7nf 20 v/ f s cpv_ input frequency 85 khz input low voltage cpv_, stv, en, 2.2v < v vdd < 3.6v 0.8 v input high voltage cpv_, stv, en, 2.2v < v vdd < 3.6v 2 v dish low voltage -1.5 v dish high voltage -0.5 v dish input impedance v dish = -2v 600 k i dish switch resistance v dish = -2v 500 i dly output current dly = gnd 3 5 f a dly sink current en = gnd, v dly = 0.4v 5 ma dly enable threshold rising 1.60 1.70 v www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 6 ______________________________________________________________________________________ typical operating characteristics (circuit of figure 1, v vdd = v en = 3.3v, v von = 25v, v voff = -15v, t a = +25 n c, unless otherwise noted.) stv/stvp input/output waveforms with logic input MAX17120 toc01 stvp 10v/div 0v 0v stv 5v/div 4fs/div cpv, ckv, and ckvb input/output waveforms with logic input (stv = 0v, c load = 5nf, r load = 50i, r cs = 200i) MAX17120 toc02 ckv 20v/div ckvb 20v/div 0v 0v 0v cpv 5v/div 4fs/div 100ns/div stv rising edge propagation delay (c load = 5nf, r load = 200i) MAX17120 toc03 stvp 10v/div 0v 0v stv 5v/div stv falling edge propagation delay (c load = 5nf, r load = 200i) MAX17120 toc04 stvp 10v/div 100ns/div 0v 0v stv 5v/div 100ns/div cpv/ckv rising edge propagation delay (c load = 5nf, r load = 50i) MAX17120 toc05 ckv 10v/div 0v 0v cpv 5v/div 100ns/div cpv/ckv falling edge propagation delay (c load = 5nf, r load = 50i) MAX17120 toc06 ckv 10v/div 0v 0v cpv 5v/div www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 _______________________________________________________________________________________ 7 typical operating characteristics (continued) (circuit of figure 1, v vdd = v en = 3.3v, v von = 25v, v voff = -15v, t a = +25 n c, unless otherwise noted.) 20ns/div stvp slew rate on falling edge (c load = 5nf, r load = 200i) MAX17120 toc10 stvp 10v/div 0v 0v stv 5v/div 10ms/div enable delay function MAX17120 toc11 cpv 2v/div dly 2v/div ckv 20v/div 0v 0v 0v 0v en 5v/div 20ns/div ckv slew rate on rising edge (stv = vdd, c load = 5nf, r load = 50i) MAX17120 toc07 ckv 10v/div 0v 0v cpv 5v/div 20ns/div ckv slew rate on falling edge (stv = vdd, c load = 5nf, r load = 50i) MAX17120 toc08 ckv 10v/div 0v 0v cpv 5v/div 20ns/div stvp slew rate on rising edge (c load = 5nf, r load = 200i) MAX17120 toc09 stvp 10v/div 0v 0v stv 5v/div www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 8 ______________________________________________________________________________________ pin description pin name function 1 ckvbcs2 ckvb2 charge-sharing connection. ckvbcs2 connects to ckvcs2 whenever cpv2 and stv are both low (to make ckv2 and ckvb2 high impedance) to allow ckv2 to connect to ckvb2, sharing charge between the capacitive loads on these two outputs. 2 ckvb2 high-voltage scan-drive output. ckvb2 is the inverse of ckv2 during active states and is high impedance whenever ckv2 is high impedance. 3, 11, 15, 18, 21, 23, 30 n.c. not connected 4 ckv3 high-voltage scan-drive output. when enabled, ckv3 toggles between its high state (connected to von) and its low state (connected to voff) on each falling edge of the cpv3 input. further, ckv3 is high impedance whenever cpv3 and stv are both low. 5 ckvcs3 ckv3 charge-sharing connection. ckvcs3 connects to ckvbcs3 whenever cpv3 and stv are both low (to make ckv3 and ckvb3 high impedance) to allow ckvb3 to connect to ckv3, sharing charge between the capacitive loads on these two outputs. 6 ckvbcs3 ckvb3 charge-sharing connection. ckvbcs3 connects to ckvcs3 whenever cpv3 and stv are both low (to make ckv3 and ckvb3 high impedance) to allow ckv3 to connect to ckvb3, sharing charge between the capacitive loads on these two outputs. 7 ckvb3 high-voltage scan-drive output. ckvb3 is the inverse of ckv3 during active states and is high impedance whenever ckv3 is high impedance. 8 stvp high-voltage scan-drive output. stvp is connected to v off when stv is low and is connected to v on when stv is high and cpv1 is low. when both stv and cpv1 are high, stvp is high impedance. 9 gnd ground 10 stv vertical sync input. the rising edge of stv begins a frame of data. the stv input is used to generate the high-voltage stvp output. 12 cpv1 vertical clock pulse input. cpv1 controls the timing of the ckv1 and ckvb1 outputs, which change state (by first sharing charge) on its falling edge. 13 cpv2 vertical clock pulse input. cpv2 controls the timing of the ckv2 and ckvb2 outputs, which change state (by first sharing charge) on its falling edge. 14 cpv3 vertical clock pulse input. cpv3 controls the timing of the ckv3 and ckvb3 outputs, which change state (by first sharing charge) on its falling edge. 16 en enables the MAX17120. drive en high to start up the MAX17120 after a delay time, which is set by a capacitor at dly. 17 dly startup delay setting. connect a capacitor to adjust the delay based on t delay = c dly x 410k i . 19 dish voff discharge connection. pulling dish below ground activates an internal connection between voff and gnd, rapidly discharging the voff supply. typically, dish is capacitively connected to vdd, so that when vdd falls, voff is discharged. 20 vdd supply input. vdd is the logic supply input for the scan driver. bypass to gnd through a minimum 0.1 f f capacitor. 22 voff gate-off supply. voff is the negative supply voltage for the ckv_, ckvb_, and stvp high-voltage driver outputs. bypass to gnd with a minimum 1 f f ceramic capacitor. 24 von gate-on supply. von is the positive supply voltage for the ckv_, ckvb_, and stvp high-voltage driver outputs. bypass to gnd with a minimum 1 f f ceramic capacitor. www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 _______________________________________________________________________________________ 9 pin description (continued) pin name function 25 gnd ground 26 ckv1 high-voltage scan-drive output. when enabled, ckv1 toggles between its high state (connected to von) and its low state (connected to voff) on each falling edge of the cpv1 input. further, ckv1 is high impedance whenever cpv1 and stv are both low. 27 ckvcs1 ckv1 charge sharing connection. ckvcs1 connects to ckvbcs1 whenever cpv1 and stv are both low (to make ckv1 and ckvb1 high impedance) to allow ckvb1 to connect to ckv1, sharing charge between the capacitive loads on these two outputs. 28 ckvbcs1 ckvb1 charge-sharing connection. ckvbcs1 connects to ckvcs1 whenever cpv1 and stv are both low (to make ckv1 and ckvb1 high impedance) to allow ckv1 to connect to ckvb1, sharing charge between the capacitive loads on these two outputs. 29 ckvb1 high-voltage scan-drive output. ckvb1 is the inverse of ckv1 during active states and is high impedance whenever ckv1 is high impedance. 31 ckv2 high-voltage scan-drive output. when enabled, ckv2 toggles between its high state (connected to von) and its low state (connected to voff) on each falling edge of the cpv2 input. further, ckv2 is high impedance whenever cpv2 and stv are both low. 32 ckvcs2 ckv2 charge-sharing connection. ckvcs2 connects to ckvbcs2 whenever cpv2 and stv are both low (to make ckv2 and ckvb2 high impedance) to allow ckvb2 to connect to ckv2, sharing charge between the capacitive loads on these two outputs. ep exposed pad. ep is not connected in the ic. the ep should be connected to gnd plane on the pcb to improve thermal performance. www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 10 _____________________________________________________________________________________ figure 1. typical operating circuit v vdd = 3.3v ckvb1 ckvbcs1 ckvcs1 ckv1 von gnd voff stv cpv1 cpv2 cpv3 en dly gnd dish vdd ckvb2 ckvbcs2 ckvcs2 ckv2 stvp ckvb3 ckvbcs3 ckvcs3 ckv3 v von = 25v v goff = -15v 1f 0.1f 0.1f 0.1f 1f n.c. n.c. n.c. n.c. n.c. n.c. 200i 200i equivalent load of display panel 200i 200i 200i 200i t-con stv cpv3 cpv2 en cpv1 MAX17120 www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 ______________________________________________________________________________________ 11 figure 2. functional diagram detailed description the MAX17120 contains three high-voltage level-shifting scan drivers for active-matrix tft lcds. figure 2 is the functional diagram. undervoltage lockout on vdd the undervoltage lockout (vdd-uvlo) circuit on vdd compares the input voltage at vdd with the vdd-uvlo (2v typ) to ensure that the input voltage is high enough for reliable operation. there is 100mv of hysteresis to prevent supply transients from causing a restart. when the vdd voltage is below vdd-uvlo, the scan-driver outputs are high impedance. logic and gate driver + thermal shutdown vdd von cpv1 stv cpv2 cpv3 dly en 0.5v delay stvp voff ckvcs1 ckvbcs1 ckvcs2 ckvbcs2 ckvcs3 ckvbcs3 ckv2 ckvb1 ckv1 ckvb2 ckv3 ckvb3 gnd dschg dish voff MAX17120 uvlo www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 12 _____________________________________________________________________________________ undervoltage lockout on von the undervoltage lockout (von-uvlo) circuit on v on compares the input voltage at von with the von-uvlo (12v typ) to ensure that the input voltage is high enough for reliable operation. there is 1v of hysteresis to prevent supply transients from causing a restart. when the von voltage is below von-uvlo, the scan-driver outputs are high impedance. high-voltage level-shifting scan driver the MAX17120 includes three high-voltage level-shifting scan drivers. the scan-driver outputs (ckv1, ckv2, ckv3, ckvb1, ckvb2, ckvb3, and stvp) swing between the power-supply rails (von and voff) accord - ing to their corresponding input logic levels. the states of the ckv1, ckvb1, and stvp outputs are determined by the input logic levels present on stv and cpv1. the states of the ckv2, ckvb2, and ckv3, ckvb3 outputs are determined by the input logic levels present on stv, cpv2, and stv, cpv3, respectively (see figure 3, table 1, and table 2). stv is the vertical timing signal. cpv1, cpv2, and cpv3 are the tft gate logic timing signals. these signals have cmos input logic levels set by the vdd supply voltage. ckv1, ckv2, and ckv3 are scan clock outputs, which are complementary to scan clock outputs ckvb1, ckvb2, and ckvb3, respectively. these output signals swing from von to voff, which have a maximum upper level of +40v, a minimum lower level of -30v, and a com - bined maximum range of von - voff = 65v. their low output impedance enables them to swiftly drive capaci - tive loads. input pins ckvcs1, ckvbsc1, ckvcs2, ckvbsc2, ckvcs3, and ckvbcs3 allow the charge in the panel equivalent capacitors to be shared. this reduces the power loss in state transition. enable function en is an active-high logic input that enables/disables the MAX17120 output drive. drive en high to enable the MAX17120 scan driver. when en is low, all the drivers outputs are pulled to voff. table 2. ckv_, ckvb_ logic h = high, l = low, high-z = high impedance, = rising edge, x = dont care, h* = v dly > 1/2 x v vdd , l x = v dly < 1/2 x v vdd . table 1. stvp logic h = high, l = low, high-z = high impedance, x = dont care, h* = v dly > 1/2 x v vdd , l* = v dly < 1/2 x v vdd . figure 3. scan driver system diagram von en v dly input signals outputs stv cpv_ ckv_ ckvb_ charge sharing > uvlo h h* l l high-z high-z yes l h toggle toggle no h l voff von no h h von voff no l* x x voff voff no low x x x voff voff no < uvlo x x x x high-z no von en v dly input signals output (stvp) stv cpv1 > uvlo h h* l x l h l h h h high-z l* x x l l x x x l < uvlo x x x x high-z system video timing panel glass column driver high-voltage shift register ckv1 ckvb1 stvp ckv2 ckvb2 cpv1 stv cpv2 scan driver MAX17120 ckv1, ckv2 = scan clk odd ckvb1, ckvb2 = scan clk even stvp = high-voltage stv www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 ______________________________________________________________________________________ 13 delay function the dly input sets the delay time in the startup when the MAX17120 is enabled and the scan-driver outputs are enabled. the delay time is adjustable by choosing a different capacitor at dly. calculate the delay capaci - tance as: c dly = t delay /410k w the delay enable trip point is v vdd /2. before v dly reaches the threshold, scan-driver outputs stay in the same state as en is low. if there is no delay needed in the startup, connect dly to vdd. voff rapid-discharge function (dish input) the dish input controls a switch between voff and gnd. when dish is pulled below ground by at least 1.5v, voff is rapidly discharged to gnd. typically, dish is capacitively coupled to vdd so that if vdd falls suddenly, voff is quickly discharged to gnd. thermal-overload protection the thermal-overload protection prevents excessive power dissipation from overheating the device. when the junc - tion temperature exceeds t j = +160 n c, a thermal sensor immediately shuts down the scan-driver outputs. the outputs are set to high impedance. once the device cools down by approximately 15 n c, the device reactivates. the thermal-overload protection protects the ic in the event of overheat conditions. for continuous operation, do not exceed the absolute maximum junction tempera - ture rating of t j = +150 n c. figure 4. ckv timing cpv_ v dd gnd v on t r t f t csrs v coff t csf ckv_ or ckvb_ www.datasheet.co.kr datasheet pdf - http://www..net/
triple high-voltage scan driver for tft lcd MAX17120 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 14 maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. applications information power dissipation an ics maximum power dissipation depends on the thermal resistance from the die to the ambient environ - ment and the ambient temperature. the thermal resis - tance depends on the ic package, pcb copper area, other thermal mass, and airflow. the MAX17120, with its exposed backside paddle sol - dered to 1in 2 of pcb copper, can dissipate approximate - ly 27.8mw into +70 n c still air. more pcb copper, cooler ambient air, and more airflow increase the possible dis - sipation, while less copper or warmer air decreases the ics dissipation capability. scan-driver outputs the power dissipated by the scan-driver outputs (ckv1, ckvb1, stvp, ckv2, and ckvb2), depends on the scan frequency, the capacitive load, and the difference between the von and voff supply voltages. assuming each output driver is the same capacitance, the power loss is: ( ) 2 scan scan panel gon goff pd = 7 x f x c x v -v where f scan is the scan frequency of the panel, c panel is the panel model capacitive load, v gon and v goff are the positive gate-on and negative gate-off voltages. if all the scan drivers operate at a frequency of f scan = 50khz, the load of the six outputs is c panel = 5nf, and the supply voltage difference is von - voff = 30v, then the power dissipated is 1.575w. pcb layout and grounding careful pcb layout is important for proper operation. use the following guidelines for good pcb layout: ? place the von, voff, and vdd pin bypass capaci - tors as close as possible to the device. the ground connections of the von, voff, and vdd bypass capacitors should be connected directly to the gnd pin with a wide trace. ? avoid using vias in the high-current paths. if vias are unavoidable, use many vias in parallel to reduce resistance and inductance. ? connect the MAX17120s exposed paddle to gnd copper plane and the copper plane area should be maximized to improve thermal dissipation. ? minimize the length and maximize the width of the traces between the ckv, ckvb, and stv output nodes and the panel load for best transient responses. refer to the MAX17120 evaluation kit for an example of proper board layout. chip information process: bicmos package information for the latest package outline information and land pat - terns, go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suf - fix character, but the drawing pertains to the package regardless of rohs status. package type package code document no. 32 tqfn t-3225 21-0140 www.datasheet.co.kr datasheet pdf - http://www..net/

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