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Ordering number : EN4939
Thick Film Hybrid IC
STK66083P
Non-Chopping Current Drive Print Head Driver
Applications
* Printers that require head drivers * Various relay drive applications
Package Dimensions
unit: mm 4094
[STK66083P]
Features
* A total of 116 devices, including drive power transistors and flyback voltage take-up diodes, are incorporated into a single package to reduce the total printed circuit board mounting area. * A constant-current drive scheme can be implemented by setting the individual phase head current rise times to arbitrary values. Furthermore, the STK66083P's ability to handle a high supply voltage (VCC1 = 36 V) allows the current rise times to be shortened. * The built-in input pull-up resistors allow the STK66083P to be driven by open collector type TTLICs in the previous stage. Also, the provision of a base drive pin allows the STK66083P to support an enable function. * Since the D1 to D12 flywheels for each phase are connected to the power supply, the flyback energy due to the winding inductance (L) can be returned to the power supply. This allows the power dissipation in the power supply and other circuits to be reduced.
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage 1 Maximum supply voltage 2 Phase output current 1 Phase output current 2 Operating substrate temperature Junction temperature Storage temperature Transistor withstand voltages Symbol VCC max1 VCC max2 Iop1 max Iop2 max Tc max Tj max Tstg VCEO TR1 to TR12 IC 1 mA One pulse: 1 ms One pulse: 1 ms No signal Conditions Ratings 60 7.0 15 6 105 150 -40 to +125 70 Unit V V A A C C C V
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
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32095TH (OT) No. 4939-1/9
STK66083P Allowable Operating Conditions at Ta = 25C
Parameter Supply voltage 1 Supply voltage 2 Phase output current 1 Phase output current 2 Symbol VCC1 VCC2 Iop1 max Iop2 max For a 1 ms period and continuous operation with a duty cycle of 50% or lower while power is applied. For a 1 ms period and continuous operation with a duty cycle of 50% or lower while power is applied. Conditions Ratings 18 to 42 5.0 10% 10 3.5 Unit V V A A
Operating Characteristics at Ta = 25C, VCC1 = 36 V, VCC2 = 5 V
Parameter Input on voltage Input off voltage Input off current 1 Input off current 2 Output saturation voltage 1 Output saturation voltage 2 Output leakage current 1 Output leakage current 2 Diode leakage current Diode forward voltage 1 Diode forward voltage 2 Symbol VIH VIL IIL1 IIL2 Vst1 Vst2 IL1 IL2 IL3 Vdf1 Vdf2 VCC2 = 5 V, TR1 to TR18 VCC2 = 5 V, TR15 to TR18 VCC2 = 5 V, TR1 to TR12 IO = 5.0 A, TR15 to TR18 IO = 1.8 A, TR1 to TR12 VCE= 60 V, TR15 to TR18 VCE= 70 V, TR1 to TR12 100 V, D1 to D16 Idf = 2.0 A, D13 to D16 Idf = 0.5 A, D1 to D12 1.2 1.0 0.25 2.5 Conditions min 4.0 0.8 0.35 3.5 1.2 1.1 1.0 0.45 4.5 1.9 1.9 1.0 1.0 0.1 1.8 1.8 typ max Unit V V mA mA V V mA mA mA V V
Note: A constant-voltage power supply must be used.
Equivalent Circuit
Note: Values in parentheses indicate pins 42 to 82 on the back side of the case.
No. 4939-2/9
STK66083P Test Circuits
No. 4939-3/9
STK66083P Vdf1 Vdf2
Sample Application Circuit
No. 4939-4/9
STK66083P Usage Notes Circuit Notes Timing Charts Constant Current Drive
1. Incorrect input signal operation If the input signals A and B shown in the figures are input incorrectly (e.g., if their timings exceed the rated time), overcurrents or DC currents can occur, and the printer head or the thick film IC itself may be destroyed. Therefore, applications must be designed with adequate consideration for this problem and must include protection and reset circuits. 2. The maximum heat dissipation in the print head and the thick film IC occurs when printing solid black (continuous printing). * Use a heat sink to cool the hybrid IC substrate so that the substrate temperature (Tc) remains under 105C. * When the print head overheats, the heat dissipated in the head can damage the print head itself. This can lead to destruction of the hybrid IC when, for example, the overheating results in a short circuit in the head coils that results in overcurrents in the hybrid IC. Notes on Mounting 1. Incorrect mounting, including open input pins, load shorting, pin-to-pin shorting, and pattern shorts on the printed circuit board can lead to abnormal states and destruction of the hybrid IC. 2. Clamp both the printed circuit board and the hybrid IC in place when mounting the hybrid IC on a printed circuit board. 3. Apply silicone grease to the hybrid IC substrate and attach a heat sink that is adequate to dissipate the heat generated within the IC.
No. 4939-5/9
STK66083P STK66083P Operation
Fig. 1 Input Signals and Winding Current Waveforms
Fig. 2
This section describes STK66083P operation based on the equivalent circuit for a single dot driver circuit. As shown in Figure 1, signals are input to TR1 and TR2 so that they are turned on for the periods t1 and t2. The periods t1 and t2 are set up to have the following relationship. t1 < t2 ..................................................................................... (1) When both TR1 and TR2 are turned on at time t = 0, the head coil winding current i1 (for the period 0 t t1) increases according to the following formula due to the time constant (L/R), which is determined by the head coil inductance L and the winding resistance R. t VCC - Vsat i1 = (1 - e- ) .................................................. (2) R = L/R L: Head coil inductance R: Head coil winding resistance Vsat = Vst (1) + Vst (2) Vst (1): VCE (sat) for TR1 Vst (2): VCE (sat) for TR2
Therefore, the winding current value I1 at time t1 is given by the following formula. t1 VCC - Vsat I1 = (1 - e- ) ................................................. (3) R Next, when TR1 is turned off at time t1, VCC is cut off. However, the winding current i2 (for the period t1 t t2) continues to flow through the diode D1. This current decreases according to the following formula. t - t1 i2 = I1e- ) ....................................................................... (4) The winding current gradually decreases, and when TR2 is turned off at time t2, the winding current I2 is given by the following formula. t2 - t1 I2 = I1e- ) ...................................................................... (5) After TR2 is turned off, the winding current i3 (for the period t2 < t) is returned to the power supply through the diodes D1 and D2. t - t2 VCC VCC i3 = (I2 + R ) e- - R .......................................... (6)
Fig. 3
No. 4939-6/9
STK66083P
Fig.4
Fig. 5 Winding Current Waveform and Power Supply Current Waveform
As described above, the rated current for the head coils can be set up by setting up the input signals appropriately. Note that mutual inductance occurs due to the structure of the head coils, and that the coil inductance is lower when all dots are printed than when only a single dot is printed. This results in increased winding currents. Therefore, the input signal timing setup must be checked with the heads actually used. Thermal Design 1. c-a (heat sink thermal resistance) The heat sink thermal resistance required due to the average power dissipation (Pd) within the hybrid IC is calculated using the following formula. c-a = Tc max - Ta .............................................................. (7) Pd Tcmax: Maximum substrate temperature Ta: Ambient temperature
The required area for a 2 mm thick aluminum heat sink can be determined from Figure 7.
Fig. 6 c-a vs. Pd
Fig. 7 c-a vs. S
However, even for identical temperatures the required heat sink area will vary with the conditions within the final product, including the air circulation within the chassis and whether or not a cooling fan is provided. Therefore, be sure to confirm that the STK66083P's substrate temperature does not exceed 105C in the actual end product.
No. 4939-7/9
STK66083P 2. Average Internal Power Dissipation The STK66083P incorporates the circuits for twelve print head dots within a single case. This circuit can be considered to be four identical circuits each of which drives three dots. Therefore, the total average power dissipation can be derived by calculating the average power dissipation for 1/4 of the circuits. Figure 8 shows the circuit for 1/4 of the STK66083P.
Fig. 8 Circuit for 1/4 of the STK66083P (3 dots)
Fig. 9 Winding Current for a Single Dot
Figure 9 shows the winding current for a single dot. Here, the average power dissipation Pd' for 1/4 of the circuits can be expressed as follows. Pd' = the TR15 power dissipation + the TR1, TR2, and TR3 power dissipation + the D16 power dissipation + the D1, D2, and D3 power dissipation Consider the case when all three dots are printed during the period T. This is solid printing and the most severe case. Here, Pd' can be approximated as follows since the winding current for three dots flows through TR15 and D16. T1 Pd' = 0.5 x 3I1 x Vst (1) x T T1 I1 + I2 T2 +3 x (0.6 x I1 x Vst (2) x T + 0.7 x x Vst (2) x T ) 2 3I1 + 3I2 T2 T3 +0.8 x x VF (1) x T + 0.3 x 3I2 x VF (1) x T ) 2 T3 +3 x (0.25 x I2 x VF (2) x T ) .................................... (8) Vst (1): VCE (sat) for the current 3I1 in TR15 Vst (2): VCE (sat) for the current I1 in TR1, TR2, and TR3 VF (1): Vdf for the current 3I1 in D16 VF (2): Vdf for the current 3I2 in D1, D2, and D3 Multiplying by four for the whole case gives: Pd" = 4Pd'
No. 4939-8/9
STK66083P However, continuous solid printing (all black) does not occur in actual operation, and the situation that is actually the most severe is the printer self check operation. Therefore, it is economically advantageous to assume that the Pd for practical operation will be 10% or less of that for solid black printing. Therefore: Pd = 0.1 x Pd" 0.1 x Pd" = 0.1 x 4 Pd' 0.1 x 4 Pd' = 0.4 Pd'................................................................ (9) Another point is that normally the printing duty during the iteration period T should be set to be 50% or lower ( T1 + T2 0.5). T
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any and all SANYO products described or contained herein fall under strategic products (including services) controlled under the Foreign Exchange and Foreign Trade Control Law of Japan, such products must not be exported without obtaining export license from the Ministry of International Trade and Industry in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of August, 1998. Specifications and information herein are subject to change without notice. PS No. 4939-9/9

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