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AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 1 revd: 05/05/23 features ? 95% efficient possible dc/dc converter ? combine step-up and step-down for 90% efficient boost-buck ? bulit-in led driver and open led overvoltage protection ? transformerless inverting controller for ccd bias ? 2 channel built-in mosfet current- mode pwm and 4 channel extra pwm controllers (ch-3 synchronous output) ? up to 1mhz operating frequency ? shutdown current <1ua ? built-in soft-start function ? built-in short-circuit protection function ? qfn48 package applications ? dsc power supply general description the AT1396A/b/c/d provide a complete power supply solution for digital cameras. they improve p erformance, component count, and size compared to other multi-channel controllers in 2-cell aa, 1-cell li-ion, and dual-battery designs. on-chip mosfets provide up to 92~95% efficiency for critical power supplies, while additional channels operate with external fets for optimum design flexibility. all channels dc/dc operate at one fixed frequency settable from 100khz to 1mhz to optimize size, cost, and efficiency. pin assignment ordering information part number package marking AT1396An qfn48,green AT1396An at1396bn qfn48,green at1396bn at1396cn qfn48,green at1396cn at1396dn qfn48,green at1396dn aimtron reserves the right without notice to change this circuitry and specifications.
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 2 revd: 05/05/23 block diagram
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 3 revd: 05/05/23 pin description pin no. pin name i/o description 1 ss1 i ch1 soft-start input 2 ctl5 i ch5 enable input 3 ctl6 i ch6 enable input 4 lxu o step-up converter switching node 5 ctlu i ch1 enable and chip enable input 6 pgnd1 p power ground 7 pgnd2 p power ground 8 ctld i ch2 enable input 9 lxd o step-down converter switching node 10 ctl3 i ch3 enable input 11 ctl4 i ch4 enable input 12 ss2 i ch2 soft-start input 13 /sdok o open-drain, active low, power good for step-down 14 cscp i short circuit protection input 15 pvcc2 p step-down converter input 16 comp2 o step-down converter compensation node 17 fbd i step-down converter feedback input 18 ss3 i ch3 soft-start input 19 comp3 o ch3 compensation node 20 fb3 i ch3 feedback input 21 ss4 i ch4 soft-start input 22 comp4 o ch4 compensation node 23 in4 i ch4 negative feedback input 24 ip4 i ch4 positive feedback input 25 pvcc3 p ch3 power 26 out3m o ch3 master output driver 27 out3s o ch3 slave output driver 28 pgnd3 p power ground 29 out4 o ch4 output driver 30 out5 o ch5 output driver 31 out6 o ch6 output driver 32 pvcc4 p ch4 power 33 gnd p power ground 34 fb5h i ch5 controller voltage feedback input 35 fb5 i ch5 controller voltage feedback/current feedback 36 comp5 o ch5 compensation node 37 vbg o reference bypass 38 ss5 i ch5 soft-start input 39 fb6 i ch6 feedback input 40 comp6 o ch6 compensation node 41 ct o oscillator control 42 vreg p reference output 43 fbu i step-up converter input 44 comp1 o step-up controller compensation node 45 vcc p ic power input 46 pvcc1 p power output of the step-up converter 47 ss6 i ch6 soft-start input 48 sel4 i configures the ch4 as a step-up or step-down
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 4 revd: 05/05/23 absolute maximum ratings item symbol ratings units storage temperature t stg -55 e 150
operating temperature t opr -30 e 85
pvcc1,pvcc2,pvcc3,pvcc 4 input voltage -0.3 e 5.5 v lxu,lxd, out3m,out3s input voltage v lx/out -0.3v +5.5 v other input pin -0.3v +5.5 v lxu current 3.6 a lxd current 2.25 a out3m,out3s current 200 ma power consumption pd 1000 mw esd classification 2 kv electrical characteristics (pvcc1=pvcc2=pvcc3=pvcc4=vcc=3.6v, ta=+25 0 c) values parameter symbol condition min. typ. max. unit general input voltage range vcc channel 1 dc/dc 1.2 - 5.5 v ch1,ch2 switch- off input current i vcc no switching, fbu=fbd=0.9v ctlu=ctld=3.6v,other disable - 1 1.1 ma ch1,ch2, ch3(or 4,5,6) switch- off input current i vcc no switching, fbu=fbd=fb3=0.9v ctlu=ctld=ctl3=3.6v other disable - 1.2 1.3 ma shutdown current i vcc all ctl disable - 1 10 ? a reference reference output voltage v reg i reg =1ma 2.275 2.30 2.325 v reference load regulation ? v reg1 1ma< i reg <10ma - 5 10 mv reference line regulation ? v reg2 2.5 AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 5 revd: 05/05/23 frequency variation with input voltage ? f osc2 v cc =2.5v~5.5v - 1 5 % channel 1(step-up) pre-osc to osc trip level v cc1 vcc rising edge - 2.45 - v pre-osc to osc hysteresis ? vcc1 - 100 - mv under voltage lockout vcc - 2.45 - v input voltage range pvcc1 channel 1 dc/dc 1.2 - 6.0 v normal operating soft-start charge current i ss1 v cc =2.5v~5.5v 0.8 1 1.5 a fbu regulation voltage v fbu t a =-20 c ~+85 c 0.784 0.8 0.816 v fbu input current i fbu fbu=0.8v - - 100 na current-sense amplifier transresistance r cs - 0.285 - v/a transconductance g mea - 140 - s maximum duty cycle d max fbu=0.7v 85 90 95 % pvcc1 leakage current i l1 v lxu =0v,pvcc1=5.5v - 5 12 a lx leakage current i lx1 v lxu =5.5v - 1 5 a r n n-channel - 95 150 m ? switch on-resistance r p p-channel - 150 250 m ? n-channel current limit i limit1 1.8 2.1 2.4 a p-channel turn-off current i rev1 - 20 - ma startup current limit i limit-s pvcc1=1.5v - 450 - ma startup frequency f start pvcc1=1.5v - 200 - khz channel 2(step-down) input voltage range pvcc2 channel 2 dc/dc 1.2 - 6.0 v normal operating soft-start charge current i ss2 v cc =2.5v~5.5v 0.8 1 1.5 a fbd regulation voltage v fbd t a =-20 c ~+85 c 0.784 0.8 0.816 v fbd input current i fbd fbd=0.8v - - 100 na current-sense amplifier transresistance r cs - 0.6 - v/a transconductance g mea - 140 - s maximum duty cycle d max fbd=0.7v - 100 - %
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 6 revd: 05/05/23 lx leakage current i lx2 v lx =0~3.6v,pvcc2=3.6v - 1 5 a r n n-channel - 95 150 m ? switch on-resistance r p p-channel - 150 250 m ? p-channel current limit i limit2 1.0 1.2 1.4 a n-channel turn-off current i rev2 - 20 - ma /sdok output low voltage v sdok 0.1ma into /sdok - 0.01 0.1 v /sdok leakage current i l_sdok ctld=0v,/sdok=5.5v - 0.1 1 a channel 3 input voltage range pvcc3 channel 3 dc/dc 1.2 - 6.0 v normal operating soft-start charge current i ss3 v cc =2.5v~5.5v 0.8 1 1.5 a fb3 input current i fb3 fb3=0.8v - - 100 na fb3 regulation voltage v fb3 t a =-20 c ~+85 c, fb3=comp3 0.784 0.8 0.816 v error amplifier voltage gain av dc 80 - - db error amplifier frequency bandwidth bw av=0db - 5 - mhz v oh - 1.0 - v error amplifier output voltage v ol - 10 - mv i source comp=0.8v - -0.5 - ma error amplifier output source current i sink comp=0.8v - 60 - a output source current i source duty=90%,out=1/2vcc - -130 -80 ma output sink current i sink duty=0%,out=1/2vcc 65 100 - ma r oh out=-15ma - 18 30 ? output on-resistor r ol out=15ma - 16 25 ? d max step-up mode 85 90 95 % maximum duty cycle d max step-down mode - 100 - % channel 4,5,6
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 7 revd: 05/05/23 input voltage range pvcc4 channel 4,5,6 dc/dc 1.2 - 6.0 v normal operating soft-start charge current i ss4/5/6 v cc =2.5v~5.5v 0.8 1 1.5 a fb4/5/6 regulation voltage v fb4/5/6 t a =-20 c ~+85 c, fb_=comp_ 0.784 0.8 0.816 v fb5 regulation voltage for led driver v fb5 t a =-20 c ~+85 c, fb5=comp5 0.19 0.20 0.21 v fb5h ovp trip level v fb5h t a =-20 c ~+85 c, 0.98 1.00 1.02 v error amplifier voltage gain av dc 80 - - db error amplifier frequency bandwidth bw av=0db - 5 - mhz v oh - 1.0 - v error amplifier output voltage v ol - 10 - mv i source comp=0.8v - -0.5 - ma error amplifier output source current i sink comp=0.8v - 60 - a d max fb_=0.7v 85 90 95 % maximum duty cycle d max fb5=0.1v 85 90 95 % output source current i source duty=90%,out=1/2vcc - -130 -80 ma output sink current i sink duty=0%,out=1/2vcc 65 100 - ma r oh out=-15ma - 18 30 ? output on-resistor r ol out=15ma - 16 25 ? short circuit protection threshold voltage v th ch3,ch4,ch5,ch6 - 0.9 - v cscp charge current i cscp 0.8 1.0 1.5 a control block v ih pvcc1=vcc=1.5 ~5.5v 1.1 - vcc v ctlu input voltage v il pvcc1=vcc=1.5 ~5.5v 0 - 0.5 v v ih pvcc1 , 2=vcc=1.5 ~5.5v ctld=v ih 1.1 - vcc v ctld input voltage v il pvcc1 , 2=vcc=1.5 ~5.5v ctld=v ih 0 - 0.5 v
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 8 revd: 05/05/23 v ih pvcc1 , 3=vcc=1.5 ~5.5v ctlu=v ih 1.4 - vcc v ctl3 input voltage v il pvcc1 , 3=vcc=1.5 ~5.5v ctlu=v ih 0 - 0.5 v v ih pvcc1 , 4=vcc=1.5 ~5.5v ctlu=v ih 1.4 - vcc v ctl4 , 5 , 6 input voltage v il pvcc1 , 4=vcc=1.5 ~5.5v ctlu=v ih 0 - 0.5 v v ih pvcc1 , 4=vcc=1.5 ~5.5v ctlu=ctl4=v ih 1.4 - vcc v sel4 input voltage v il pvcc1 , 4=vcc=1.5 ~5.5v ctlu=ctl4=v ih 0 - 0.5 v
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 9 revd: 05/05/23 typical characteristics ch1 efficiency vs. load current ch3 efficiency vs. load current ch1 + ch2 efficiency vs. load current ch2 efficiency vs. load current ch1 + ch2 efficiency vs. load current ch4 , 5 , 6 efficiency vs. load current
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 10 revd: 05/05/23 ch4 , 5 , 6 efficiency vs. load current ch4 , 5 , 6 efficiency vs. load current
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 11 revd: 05/05/23
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 12 revd: 05/05/23 ch3 start-up waveform vbat = 2.0v time : 20ms/div ch3 start-up waveform vbat = 3.0v time : 20ms/div ch1,ch2,ch3 start-up waveform vbat = 3.0v time : 50ms/div ctl3 , 2v/div , dc vm=3.3v , 2v/div , dc iout m ,100ma/div , dc i bat , 1a/div , dc ctl3 , 2v/div , dc vm=5.0v , 2v/div , dc iout m , 100ma/div , dc i bat , 1a/div , dc ctlu , 2v/div , dc vm=5v , 5v/div , dc vdsp_core=1.8v , 1v/div , dc vdsp_io=3.3v , 2v/div , dc
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 13 revd: 05/05/23 ch1 load transient response vbat = 3.0v time : 1ms/div ch2 load transient response vbat = 2.0v time : 1ms/div ch3 load transient response vbat = 3.0v time : 1ms/div vm , 100mv/div , ac iout1 , 200ma/div , dc vdsp_core , 100mv , ac iout2 , 100ma/div , dc vdsp_io , 100mv/div , ac iout3 , 100ma/div , dc
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 14 revd: 05/05/23 typical application circuit multi-battery application
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 15 revd: 05/05/23 2-aa battery application
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 16 revd: 05/05/23 1-li battery application
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 17 revd: 05/05/23 application information the AT1396A/b/c/d include 6 channels dc/d c to generate a multiple-output digital camera power-supply system. it include: z step-up dc/dc converter with on- chip synchronous mosfets.(ch1) z step-down dc/dc converter with on-chip synchronous mosfets.(ch2) z main synchronous dc/dc controller can be configured as e ither a step-up or step-down converter.(ch3) z selectable dc/dc controller for boost/f lyback/buck/invertin g converters.(ch4) z white led driver with open led pr otection or boost controller.(ch5) z boost/flyback controller.(ch6) step-up dc/dc converter (ch1) the step-up dc/dc converter typi cally is used to generate a 5v or the highest of the dsc power system requirement from a 1.5v to 4.2v battery input and self-power the at1396. the efficiency is up to 95% with an internal mosfet and external synchronous rectifier. step-down dc/dc converter (ch2) the step-down dc/dc is optimized for ge nerating dsp core voltage (down to 0.8v) at high efficiency. it runs from the vo ltage at pvcc2. this pin can be connected directly to the battery if sufficient headroom exists to avoid dropout. it can be powered from the output of another c onverter (ch1 or ch3) for boost-buck operation. the ch2 also features an open-drain /sdok output that goes low when the ch2 is in regulation. /sdok may be used to drive an external p-mosfet that gates 3.3v power to the dsp after the core voltage is in regulation (figure 1). the r1,r2 and c1 is for mosfet soft-start function to avoid the more inrush current . step-up or step-down dc/dc converter (ch3) the ch3 can be as a step-up (at1396b/d) or step-down (AT1396A/c) voltage mode pwm converter. an external mosfet a nd synchronous rectifie r allow conversion efficiencies as high as 93%. step-down opera tion can be direct fr om li-ion cell if the minimum input voltage exceeds the desire d output by approximately 200mv. when
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 18 revd: 05/05/23 generating 3.3v from li-ion, boost-buck operation may be needed so a regulated output can be maintained for input voltage s above and below 3.3v. the efficiency is best than sepic or zeta structure. in th is case, it may be configure the ch3 as a step-down and connect its i nput pvcc3 to the ch1 output, set to a voltage at or above 4.2v. the output efficiency with this topology is typically up to 90%. note that the step-up output (ch1) supplies both the step-up(ch1) load and the step-down (ch2) input current when the ch3 is power ed from the ch1. th e ch3 input current reduces the available step-up output (ch1) current for other loads. figure 1. using /sdok to drive external mosfet that gates 3. 3v power to dsp after 1.8v core voltage is in regulation
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 19 revd: 05/05/23 auxiliary controller (ch4,ch5,ch6) the three auxiliary controllers operat e as fixed-frequency voltage-mode pwm controllers. they use the external mosfe ts, so output power is determined by external components. all of auxiliary co ntrollers have a guaranteed duty cycle of minimum duty cycle of 85%(boost-type) or 100%(buck/invertin g type). in boost designs that employ continuous current ( ccm), the maximum dut y cycle limits the boost ratio so: with discontinuous inductor current(dcm), no such limit exists for the input/output ratio since the inductor has time to fully discharge before the next cycle begins. the discontinuous conduction mode boost voltage conversion relations hip is given by: where k is defined as: the ch4 is selectable dc/dc controller for drive n-channel mosfets (sel=high) or p-channel mosfets (sel=low). it can be configure as the inverting circuit (figure 2), typically for ccd and lcd bias. this is useful in height-limited designs where transformers may not be desired. the efficiency is more than the charge-pump inversion for some load conditions. the ch5 can be configure as a switching- mode boost current source for white leds, fb5(0.2v) provides current-sensing feedbac k, while fb5h(1.0v) provides (optional) open-led over-voltage protection(figure 3). if used as a boost converter, fb5h is grounded and fb5(0.8v) is used as the fee dback input. in this case, ch5 behaves exactly like ch4 and ch6. the ch6 can be used for conventional dc/dc boost and flyback designs.(figure 4 ,figure 5 and figure 6) % 85 1 ? out in v v s t r l k = 2 i o v v m = 2 4 1 1 2 k d v v i o + + = ) 1 ( ? = m m k d
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 20 revd: 05/05/23 figure 2. regulated ?7.5v negative ccd bias. figure 3. led drive with open led over-voltage protection
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 21 revd: 05/05/23 figure 4. +15v and ?7.5v ccd bias with transformer figure 5. +15v and ?7.5v ccd bias with charge-pump inversion
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 22 revd: 05/05/23 figure 6. +15v and ?7.5v ccd bias with charge-p ump (using at1202 to regulated the negative output) soft-start setting (ch1~ch6) the at1396 all channels feature a soft-start function that limits inrush current and prevents excessive battery loading at star t-up by ramping the output voltage of each channel up to the regulation voltage. consider the input voltage a nd load current to design the capacitor connected to the ss pin. it can calculate the ch1~6 soft start time ts(s)(valid threshold 0.3~0.8v interval). note : it could be disabled soft start function by floating ss pin. i t v c = ? ? ) ( 5 . 0 ) ( f c s ts =
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 23 revd: 05/05/23 scp protection setting (ch3~ch6) the cscp comparator detects ch3,ch4, ch5 and ch6 output voltage while the power converter work at norma l condition. at the same time, the voltage level of cscp pin is held at low level. if th e output load of these converters rapidly malfunction or short, causing the output volta ge to drop, the cscp comparator detects that to enable short circuit protection. the time period when short circuit protection show as follow equation. short detection time (t pe (s)) t pe (s) = 0.9 * c cscp ( ? f) note : it could be disabled short circuit protection f unction by connecting cscp pin into the ground. determine the triangular oscillator frequency the triangular oscillator frequency is determined by the timing capacitor (c t ). it is difficult to incorporate these non-linear characteristics into the equation. this difference is caused by characteristics, such as changes in the maximum voltage amplitude of the sawtooth waveform with th e ct value and the circuit delay causing the maximum amplitude to become large in the case of a high oscillating frequency even for the same capacitor. in practical us e, therefore, the user should read the ct values from the characteristic curve or should determine an approximate target value by using the equation. ) ( 41000 ) ( pf c khz f t osc =
AT1396A/b/c/d preliminary product information 6-channel dc-dc converter for dsc 2f, no.10, prosperity rd. ii, sci ence-based industrial park, hsinch u 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 24 revd: 05/05/23 package outline: qfn48

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