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ta8126s / f 2002-10-30 1 toshiba bipolar linear integrated circuit silicon monolithic ta8126s,TA8126F dc / dc converter for electric tuning (3v use) the ta8126s,TA8126F are dc /dc converter ics, which are designed for biasing varactor diodes of tuner system. those items are especially suitable for supplying high voltage (about 15v / 30v) for electric tuning (fm / tv / uhf / am) system of headphone stereos, radio cassette recorders, or other equipments. features excellent regulatory capability of output voltage against fluctuation of supply voltage, and of ambient temperature. excellent spurious radiation by oscillation of sine wave. output voltage can be switched over to 15v or 30v by one ? make switch, and is applicable to 10v, too. few external parts. low supply current (at non ? load,v cc = 3v, ta = 25c) i ccq1 = 2.4ma (typ., v o = 15v mode) i ccq2 = 3.0ma (typ., v o = 30v mode) operating supply voltage range (ta = 25c) v cc1 (opr) = 1.8~10v, (v o = 15v mode) v cc2 (opr) = 2.0~10v, (v o = 30v mode) block diagram weight sip9 ? p ? 2.54c: 0.72g (typ.) ssop10 ? p ? 225 ? 1.00: 0.09g (typ.)
ta8126s / f 2002-10-30 2 block diagram terminal explanation terminal voltage: typical terminal voltage with test cirucuit (v cc = 3v, ta = 25c) pin no. s / f pin name contents equivalent terminal voltage (v) 1/ 6 nc D D D 2 / 7 fb 1.4 4 / 9 osc ? hartley type oscillator 2 c 3 l 2 1 osc f ? controlling oscillation current at the terminal of fb 3.0 3 / 8 v cc D D 3.0 5 / 10 gnd D D 0 6 / 1 det D 7 / 2 v o ? boosted output (voltage double rectifier) v o = 15v / 30v D 8 / 3 sw 1 D 9 / 4 sw 2 ? output voltage mode switchover on: v o = 15v off: v o = 30v D / 5 nc D D D
ta8126s / f 2002-10-30 3 application note 1. these ics have the output voltage by means of boosting the oscillation voltage, derived from hartley type oscillator circuit and of voltage double rectifier with c 3 , d 1 , and d 2 . (1) designing of oscillation frequency f osc P 2 c 3 l 2 1 (2) coil turns can be designed as following: v osc (p p) = 2 (v cc (min) v ce1 (sat) ) n = 2 n 3 n P p) (p osc v o v (note) v cc (min) : minimum of supply voltage designed by a equipment v ce1 (sat) : saturation voltage of q 1 n : coil turns ratio (l 2 , l 3 ) v o : output voltage (v o P 30v) the turn of l 1 is designed, so as to make the terminal of fb be about 200~300mv p p through c 1 . the turn of l 1 should be small, and the capacitance of c 1 and q 0 of coil should be large, for the oscillation start at turnig power on. (3) allowance is advisable for coil design of n, q 0 . however, spurious radiation can be reduced, in case that the output current and n of coil don't make large. 2. in case that spurious radiation due to the oscillation is large, it is recommended to provide lc filter on the power supply line as shown in fig.2. as for this value, select the optimum one depending on the kind of set.
ta8126s / f 2002-10-30 4 3. pattern diagram the fig.3 shows the oscillation loop. this pattern diagram should be small, because spurious radiation due to the oscillation is reduced. the fig.4 shows the rectifier loop. this pattern diagram should be of the small, because spurious radiation due to the switching rectifier is reduced. the two loops should be isolated from other dc lines. 4. output voltage application the output voltage is applicable to about 10v, too, in case of connecting to external resistance "r x = 30k ? ", as fig.5. but, in this application, the regulatory circuit doesn't operate, which is against fluctuation of supply voltage and of ambient temperature. maximum ratings (ta = 25c) characteristic symbol rating unit supply voltage v cc 12 v output voltage v o 35 v ta8126s 750 power dissipation TA8126F p d (note) 400 mw operation temperature t opr ? 25~75 c storage temperature t stg ? 55~150 c (note) derated above ta = 25c in the proportion of 6mw / c for ta8126s, and of 3.2mw / c for TA8126F.
ta8126s / f 2002-10-30 5 electrical characteristics (unless otherwise specified: v cc = 3v, ta = 25c, f osc = 3.0mhz, i o = 100a) characteristic symbol test cir cuit sw mode test condition min. typ. max. unit i ccq1 D on i o = 0 D 2.4 5 supply current i ccq2 D off i o = 0 D 3 6 ma boosted output voltage 1 v o1 D on 14.0 15.1 16.0 v v o1 supply voltage fluctuation ? v o1 D on v cc = 10v 1.8v 20 0 20 mv v o1 ambient temperature coefficient v o1 / t D on ta = 25~75c D 0.3 D mv / c v o1 maximum output current i o1max D on ? v o1 = 30mv, with respect to standard i o = 100a 300 D D a boosted output voltage 2 v o2 D off 28.0 30.3 32.5 v ? v o2a D off v cc = 10v 2.5v 20 0 20 v o2 supply voltage fluctuation ? v o2b D off v cc = 4.5v 2.0v 30 0 20 mv v o2 ambient temperature coefficient v o2 / t D off ta = 25~75c D 0.3 D mv / c v o2 maximum output current i o2max D off ? v o2 = 30mv, with respect to standard i o = 100a 300 D D a
ta8126s / f 2002-10-30 6 test circuit coil data (test circuit) l (h) q 0 c 0 (pf) turn test frequency 2 6 4 6 1 2 2 3 4 6 wiire (mm ) reference 3mhz 103 40 22 7 2 57 2 1 0.1 uew (s) 4143 3099 356 (s): sumida electric & co., ltd.
ta8126s / f 2002-10-30 7 characteristic curves (unless otherwise specified, v cc = 3v, ta = 25c, f osc = 3mhz, i o = 100a)
ta8126s / f 2002-10-30 8 pacakage dimensions weight : 0.72g(typ.)
ta8126s / f 2002-10-30 9 package dimensions weight : 0.72g (typ.)
ta8126s / f 2002-10-30 10 package dimensions weight : 0.09g (typ.)
ta8126s / f 2002-10-30 11 toshiba is continually working to improve the quality and reliability of its products. nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. it is the responsibility of the buyer, when utilizing toshiba products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such toshiba products could cause loss of human life, bodily injury or damage to property. in developing your designs, please ensure that toshiba products are used within specified operating ranges as set forth in the most recent toshiba products specifications. also, please keep in mind the precautions and conditions set forth in the ?handling guide for semiconductor devices,? or ?toshiba semiconductor reliability handbook? etc.. the toshiba products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). these toshiba products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury (?unintended usage?). unintended usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. unintended usage of toshiba products listed in this document shall be made at the customer?s own risk. the products described in this document are subject to the foreign exchange and foreign trade laws. the information contained herein is presented only as a guide for the applications of our products. no responsibility is assumed by toshiba corporation for any infringements of intellectual property or other rights of the third parties which may result from its use. no license is granted by implication or otherwise under any intellectual property or other rights of toshiba corporation or others. the information contained herein is subject to change without notice. 000707eb a restrictions on product use

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