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| at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 features ? 2.5 to 5.5v supply voltage operating range. ? low current consumption: 1ma in operation, ? 50 khz or 100khz operation frequency . ? built-in maximum duty control. ? push-pull output. ? built-in soft start circuit. ? built-in auto-discharge function. ? built-in auto-refresh function. applications ?digital still cameras flash unit general description the at1452 is a charger control ic for photoflash capacitor with soft start function, adjustable maximum duty cycle, auto-refresh and auto- discharge (soft start capacitor) circuit. adjustable soft start is programmed w ith an external capacitor on ss pin. the control technique allows for the use of external resistor to change the switching duty and use of transformer to control the input current. automatic refresh allows the capacitor to remain charged while output voltage dropped 10%. a logic high on the charge pin initiates charging, while the ready pin signals that the capacitor is fully charged. it is ideal for dsc flash unit. * protected by u.s. patent #6,724,989 block dia g ram aimtron reserves the right without notice to change this circuitry and specifications.
at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 pin configuration ordering information part number package marking at1452ap tssop8 at1452ap at1452ap _ gre tssop8,green at1452ap, date code with one bottom line at1452bp tssop8 at1452bp at1452bp _ gre tssop8,green at1452bp, date code with one bottom line a:50khz b:100khz pin description pin no. symbol i/o description 1 charge i charge enable input 2 fb i error amplifier input 3 duty i duty control input 4gnd - ground 5 out o push-pull output 6vcc - power supply 7 ready o charge ready open drain output 8 ss i soft-start setting at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 absolute maximum ratings rated value parameter condition min. max. unit power supply voltage ? - +6.5 v source average current of out ? - -50 ma sink average current of out ? - 50 ma input voltage to error amplifier ? - 6.5 v tssop8 t a =+25 -450mw continuous power dissipation sop8 t a =+25 -500mw operating temperature ? -30 +85 0 c junction temperature ? - +125 0 c storage temperature ? -40 +150 0 c lead temperature ? - +300 0 c 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 specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. recommended operating conditions (ta=+25 0 c) values parameter symbol min. typ. max. unit power supply voltage v cc 2.5 -- 5.5 operating temperature t op -30 +25 +85 c at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 electrical characteristics (vcc = 3.3v,t a =+25 , unless otherwise noted.) values parameter symbol condition min. typ. max. unit input supply range v cc 2.5 -- 5.5 v feedback voltage v fb t a =+25 1.080 1.100 1.120 v reference variation with temperature t a =-30 to +85 -2% - 2% % auto-refresh level v fb1 v fb1 / v fb -90-% feedback voltage line-regulation v fb-line vcc=2.5v to 5.5v -5 1 5 mv standby current i ccs chrge=gnd --400 a entire device operating current i cc duty=50%, f osc =50khz -1.0-ma a 40 50 60 khz oscillator frequency fosc b 90 100 110 khz threshold voltage of ss v ss_0 duty cycle=0% -0.3- v threshold voltage of ss v ss 100 duty cycle=90% -1.1- v charging current i ss v ss =0v 0.7 1.0 1.5 a soft-start and duty section maximum duty cycle t duty 80 83 90 % output source current i source duty R9 5%, out=0v - -130 -80 ma output sink current i sink duty Q 5%, out=5v 65 100 - ma output on resistor r oh out = -15ma -1830 output section output off resistor r ol out = 15ma -1625 active mode threshold v onh 2.0 v charge on/off section disable mode threshold v onl 0.8 v at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 timing chart at1452 auto refresh mode at1452 charge toggling refresh mode at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 duty setting the duty resistor selection depends on duty cycle , choose the component using the following equation: example : set duty cycle is 50% output voltage setting 15 . 1 3 . 0 ) ( duty v v duty + = 073 . 1 ) 1 . 1 ( 15 ) ( ? = ? duty duty v k r 734 . 0 15 . 1 5 . 0 3 . 0 = + = duty v ? ? = k r duty 2 . 35 073 . 1 ) 734 . 0 1 . 1 ( 15 fb out v r r r v + = 2 2 1 v v fb 1 . 1 = at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 soft-start setting the soft start operation is determined by the capacito r connected to the ss terminal. it can calculate the soft start time ts(s). example: (fig c) r5=47k ? v duty =0.790v ? ts(s)=(0.790-0.3)*1=0.49(sec) ch1:v out ch2:ss ch3:duty ch4:i bat a t v c i t v c duty 1 3 . 0 = ? ? = ? ? ) ( ) 3 . 0 ( ) ( f c v s ts duty ? = at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 typical curve at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 typical application schematic (a) igbt trigger at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 (b) scr trigger at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 (c) li-ion application at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 ch1:charge ch2:ready ch3:v out (300v) ch4:i bat fig 1. vbat=3.0v fig 2. vbat=3.6v fig 3. vbat=4.2v v bat charge time charge input current 3.0v 6.79s 500ma 3.6v 4.62s 600ma 4.2v 3.36s 800ma * r duty can be change the input current. at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 (d) 2-cell battery application at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 ch1:ready ch2:ss ch3:v out (300v) ch4:i bat fig 4. vbat=2.0v fig 5. vbat=3.0v v bat charge time charge input current 3.0v 4.79s 800ma 2.0v 13.6s 500ma * r duty can be change the input current. at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 application information photoflash capacitor charger charge time: the energy stored in the output capacitor is: the output power required by the flyback conve rter to charge the capacitor in a period of time is: the approximate charge time for the converter circuit is: where: fs= switching frequency d= maximum duty cycle l pri = primary inductance = efficiency 2 2 v c e = = = = d i v t v c t e p avg in cap 2 2 = d i v v c t avg in out out 2 2 2 d i i i pk bat avg = = s pri in pk f l d v i = at1452 preliminary product information photoflash capacitor charger for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 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 small outline 8-pin tssop inches millimeters symbol min max min max notes a 0.114 0.122 2.90 3.10 - b 0.169 0.177 4.30 4.50 - c 0.244 0.260 6.20 6.60 - d 0.026 bsc 0.65 bsc - e 0.010 0.012 0.25 0.30 - f 0.002 0.006 0.05 0.15 - h 0.041 0.047 1.05 1.20 - k 0.005 bsc 0.127 bsc - m 0.020 0.028 0.50 0.70 0 0 8 0 0 0 8 0 - |
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