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TD62708NG 2006-06-13 1 toshiba bipolar digital integrated circuit silicon monolithic TD62708NG 8ch high current source driver the TD62708NG is comprised of eight source current output stages and enable inputs which can gate the outputs. td62708n features a large output source current of 1.8 a and minimized output voltage change vs output current change. these features make the device optimum for driving the matrix of ink jet printer print heads, leds, and the scan side of resistor matrixes. before using this device, note the thermal conditions for usage. the suffix (g) appended to the part number represents a lead (pb)-free product. features input terminal : high active enable terminal : low input output active mode output current : i out = 1.8 a (max) a little change of output voltage : ? v oh1 0.45 v (at i oh = 0.18 a~1.44 a) package type : dip24n input compatible with ttl, 5 v cmos pin connection (top view) weight: 1.2 g (typ.) TD62708NG
TD62708NG 2006-06-13 2 schematics (each driver) * 1: for normal use, connect v cc2 and v c . for applications whose thermal conditions are more demanding, toshiba recommends an external resistor (r ext : approx. 0.9 ? / 2w) be connected between v cc2 and v c . * 2: when connecting an external resistor between bv cc2 and v c , to avoid parasitic sub currents, set the voltage between v c and out as 0.3 v or more. set the external resistor value so that the voltage between v c and out is 0.3 v or more at the maximum temperature of the operating temperature range. input circuit : in, enable output voltage (temperature characteristic) output voltage (v oh ) has a temperature characteristic of 5.8 mv / c, care must be taken to keep junction temp (t j ) within safety limits. function in enable out h l on l l off don?t care h off note: since the states of the input pins (pins 3 to 10) are the same as those at high-level input, set the pins for unused channels to gnd.
TD62708NG 2006-06-13 3 absolute maximum ratings (ta = 25c) characteristic symbol rating unit supply voltage 1 v cc1 ? 0.5~7.0 supply voltage 2 v cc2 ? 0.5~40 v output current i out 1.8 (note) a input voltage v in ? 0.5~7.0 v input current i in 4.0 ma power dissipation p d 1.78 w janction temperature t j 150 c operating temperature t opr ? 40~85 c storage temperature t stg ? 55~150 c note 1: 1.8 a / ch (32 s, duty 76%), each channel should not be switched on at same time. note 2: when mounting the device on the pc board, and the temperature exceeds 25c, derate to 14.2 mw / c. recommended operating conditions characteristic symbol condition min typ. max unit supply voltage 1 v cc1 D 4.5 5.0 5.5 supply voltage 2 v cc2 D D D 30 v output current i oh (note) D D D 1.44 a v in (h) v in = h, v cc1 = 5.0 v 2.4 D v cc v v in (l) v in = l, v cc1 = 5.0 v 0 D 0.4 v v en (h) v en = h, v cc1 = 5.0 v 2.4 D v cc v input voltage v en (l) v en = l, v cc1 = 5.0 v 0 D 0.4 v operating temperature t opr D 0 D 70 c note: each channel should not be switched on at same time.
TD62708NG 2006-06-13 4 electrical characteristics (ta = 0~70c) characteristic symbol test cir ? cuit test condition min typ. max unit i l1 v cc1 = 7.0 v, in = l, en = h D D 100 i l2 v cc2 = 30 v, in = l, en = h D D 100 leakage current i l3 D v c = 30 v, in = l, en = h D D 100 a i in1 v cc1 = 5.0 v, v in = 5.0 v D 0 10 a i in2 v cc1 = 5.0 v, v in = 0 v 0.55 0.8 1.1 ma i en1 v cc1 = 5.0 v, v en = 5.0 v D 0 10 a input current i en2 D v cc1 = 5.0 v, v en = 0 v 0.55 0.8 1.1 ma v inh v cc1 = 5.0 v 2.0 D v cc +0.4 v inl v cc1 = 5.0 v gnd ? 0.4 D 0.8 v enh v cc1 = 5.0 v 2.0 D v cc +0.4 input voltage v enl D v cc1 = 5.0 v gnd ? 0.4 D 0.8 v v oh1 i oh = 1.44 a 27.0 27.5 D output voltage v oh2 D i oh = 0.18 a v cc2 = 30 v 27.5 28.0 D v change of output voltage ? v oh1 D v oh1 ? v oh2 (t j = 25c) D 0.3 0.45 v output voltage temperature characteristic ? v ce2 D v oh (t j = 105c) ? v oh (t j = 25c) i oh = 0.18 a D 0.5 D v t plh1 i out = 0.18 a D 0.1 1.0 t plh2 i out = 1.44 a D 0.2 1.0 t phl1 i out = 0.18 a D 1.0 3.5 propagation delay time t phl2 D v cc1 = v in = 4.5 v v cc2 = 30 v i out = 1.44 a D 1.5 3.5 t r1 i out = 0.18 a D 0.05 0.5 rise time t r2 i out = 1.44 a D 0.1 0.5 t f1 i out = 0.18 a D 0.3 2.0 fall time t f2 D v cc1 = v in = 4.5 v v cc2 = 30 v i out = 1.44 a D 0.3 2.0 s ac test circuit
TD62708NG 2006-06-13 5
TD62708NG 2006-06-13 6 thermal calculation where, power dissipation = (v cc1 i cc1 ) + (v cc2 i cc2 ch duty) + (v oh i oh ch duty) and the transient thermal resistance of dip24n (r + h) = 70c / w, the junction temperature (tj) is : t j (max) (p d r + h) + ta (max) expression (a) (1) when v cc2 and v c are connected: due to expression (a), for designs without cooling fins, duty = approx. 20% is required, as the following calculation shows : p d = (5 v 8 ma) + (30 v 5 ma 1ch 0.2) + (2.0 v 1.44 a 1ch 0.2) = 40 mw + 30 mw + 576 mw = 646 mw t j (max) (646 mw 70c / w) + 70c = approx. 115c ok (2) when an external resistor (r ext = 0.9 ? ) is connected between v cc2 and v c : change the above condition : v oh = 2.0 v ? (0.9 ? 1.44 a) = 0.7 v p d when substituted in expression (a) : p d = (5 v 8 ma) + (30 v 5 ma 1 0.2) + (0.7 v 1.44 a 1 0.2) = 40 mw + 30 mw + 202 mw = 272 mw t j (max) (272 mw 70c / w) + 70c = approx. 89c when t j (max) = 120c (calculation omitted) duty can be approx. 58%. conditions: v cc1 = 5 v (i cc1 = approx. 8 ma), v cc2 = 30 v (i cc2 = approx. 5 ma), 1ch on v oh = approx. 2.0 v, i oh = 1.44 a, t j (max) = 120c, ambient temperature (max) : ta = 70c
TD62708NG 2006-06-13 7 duty (when duty = 20%) condition : pulse width = 32 s (cycle = 1280 s) duty = (32 s 8ch) 1280 s = 20% application circuit note 1: toshiba recommends external resistor r ext (approx. 0.9 ? / 2w) be connected between v cc2 and v c . precautions for using this ic does not include built-in protection circuits for excess current or overvoltage. if this ic is subjected to excess current or overvoltage, it may be destroyed. hence, the utmost care must be taken when systems which incorporate this ic are designed. utmost care is necessary in the design of the output line, v cc (v cc1 , v cc2 , v c ) and gnd line since ic may be destroyed due to short ? circuit between outputs, air contamination fault, or fault by improper grounding. TD62708NG
TD62708NG 2006-06-13 8 package dimensions weight: 1.2 g (typ.)
TD62708NG 2006-06-13 9 notes on contents 1. equivalent circuits the equivalent circuit diagrams may be simplified or some parts of them may be omitted for explanatory purposes. 2. application circuits the application circuits shown in this document are provided for reference purposes only. thorough evaluation is required, especially at the mass production design stage. toshiba does not grant any license to any industrial property rights by providing these examples of application circuits. ic usage considerations notes on handling of ics (1) the absolute maximum ratings of a semiconductor device are a set of ratings that must not be exceeded, even for a moment. do not exceed any of these ratings. exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or combustion. (2) use an appropriate power supply fuse to ensure that a large current does not continuously flow in case of over current and/or ic failure. the ic will fully break down when used under conditions that exceed its absolute maximum ratings, when the wiring is routed improperly or when an abnormal pulse noise occurs from the wiring or load, causing a large current to continuously flow and the breakdown can lead smoke or ignition. to minimize the effects of the flow of a large current in case of breakdown, appropriate settings, such as fuse capacity, fusing time and insertion circuit location, are required. (3) if your design includes an inductive load such as a motor coil, incorporate a protection circuit into the design to prevent device malfunction or breakdown caused by the current resulting from the inrush current at power on or the negative current resulting from the back electromotive force at power off. ic breakdown may cause injury, smoke or ignition. use a stable power supply with ics with built-in protection functions. if the power supply is unstable, the protection function may not operate, causing ic breakdown. ic breakdown may cause injury, smoke or ignition. (4) do not insert devices in the wrong orientation or incorrectly. make sure that the positive and negative terminals of power supplies are connected properly. otherwise, the current or power consumption may exceed the absolute maximum rating, and exceeding the rating(s) may cause the device breakdown, damage or deterioration, and may result injury by explosion or combustion. in addition, do not use any device that is applied the current with inserting in the wrong orientation or incorrectly even just one time. (5) carefully select external components (such as inputs and negative feedback capacitors) and load components (such as speakers), for example, power amp and regulator. if there is a large amount of leakage current such as input or negative feedback condenser, the ic output dc voltage will increase. if this output voltage is connected to a speaker with low input withstand voltage, overcurrent or ic failure can cause smoke or ignition. (the over current can cause smoke or ignition from the ic itself.) in particular, please pay attention when using a bridge tied load (btl) connection type ic that inputs output dc voltage to a speaker directly.
TD62708NG 2006-06-13 10 points to remember on handling of ics (1) heat radiation design in using an ic with large current flow such as power amp, regulator or driver, please design the device so that heat is appropriately radiated, not to exceed the specified junction temperature (tj) at any time and condition. these ics generate heat even during normal use. an inadequate ic heat radiation design can lead to decrease in ic life, deterioration of ic characteristics or ic breakdown. in addition, please design the device taking into considerate the effect of ic heat radiation with peripheral components. (2) back-emf when a motor rotates in the reverse direction, stops or slows down abruptly, a current flow back to the motor?s power supply due to the effect of back-emf. if the current sink capability of the power supply is small, the device?s motor power supply and output pins might be exposed to conditions beyond absolute maximum ratings. to avoid this problem, take the effect of back-emf into consideration in system design.
TD62708NG 2006-06-13 11 about solderability, following conditions were confirmed ? solderability (1) use of sn-37pb solder bath solder bath temperature = 230c dipping time = 5 seconds the number of times = once use of r-type flux (2) use of sn-3.0ag-0.5cu solder bath solder bath temperature = 245c dipping time = 5 seconds the number of times = once use of r-type flux restrictions on product use 060116eba ? the information contained herein is subject to change without notice. 021023_d ? toshiba is continually working to improve the quality an d 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 utiliz ing 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 ?handli ng guide for semiconductor devices,? or ?toshiba semiconductor reliability handbook? etc. 021023_a ? 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. 021023_b ? the products described in this document shall not be used or embedded to any downstream products of which manufacture, use and/or sale are prohibited under any applicable laws and regulations. 060106_q ? the information contained herein is presented only as a guide for the applications of our products. no responsibility is assumed by toshiba for any infringements of patents or other rights of the third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of toshiba or others. 021023_c ? the products described in this document are subject to the foreign exchange and foreign trade laws. 021023_e

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