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| Ordering number : ENN7464 SANYO Semiconductors DATA SHEET Unipolar Constant-Current Chopper STK672-210 Overview Two-Phase Stepping Motor Driver Output Current: 1.4 A The STK672-210 is two-phase stepping motor driver hybrid IC (H-IC) that features further miniaturization and improved input logic flexibility as compared to the STK6712 series products. Applications The STK672-210 is optimal for use as a stepping motor driver in printers, copiers, XY plotters, and similar equipment. Features * Built-in common-mode input protection circuit * The input signal logic lines are provided as active-high and active-low pairs, and thus support switching the motor wiring. * Built-in current detection resistor for reduced external component mounting area on the printed circuit board. * Wide motor operating range (10 to 45 V) Specifications Absolute Maximum Ratings at Tc = 25C Parameter Maximum supply voltage 1 Maximum supply voltage 2 Input voltage Phase output current Repeated avalanche capacity Allowable power dissipation Operating substrate temperature Junction temperature Storage temperature Symbol VCC1 max VCC2 max VIN max IOH max Ear max Pd max Tc max Tj max Tstg With an arbitrarily large heat sink. Per MOSFET No signal No signal Logic input pins 0.5 s, 1 pulse, when VCC1 is applied Conditions Ratings 52 -0.3 to +7.0 -0.3 to +7.0 2.2 25 6.5 105 150 -40 to +125 Unit V V V A mJ W C C C 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. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 61504TN (OT) No. 7464-1/8 STK672-210 Allowable Operating Ranges at Ta = 25C Parameter Supply voltage 1 Supply voltage 2 Input voltage Phase driver withstand voltage Phase current 1 Phase current 2 Symbol VCC1 VCC2 VIH VDSS IOH max 1 IOH max 2 ID = 1 mA (Tc = 25C) When the pin 6 to 9 signals are 100 Hz, Tc = 105C, 50% duty When the pin 6 to 9 signals are 100 Hz, Tc = 90C, 50% duty With signals applied With signals applied Conditions Ratings 10 to 45 5.0 5% 0 to VCC2 100 1.4 1.6 Unit V V V V A A Electrical Characteristics at Tc = 25C, VCC1 = 24 V, VCC2 = 5 V Parameter Control supply current Output current (average) FET diode forward voltage Output saturation voltage Vref input voltage Vref input bias current [Control Input Pins] Input voltage Input current Note: A fixed-voltage power supply must be used. VIH VIL IIH IIL H-IC pins 6 to 9 H-IC pins 6 to 9 H-IC pins 6 to 9, VIN = VCC2 H-IC pins 6 to 9, VIN = 0 V 310 2.5 3.5 0.7 V V A A Symbol ICCO IO ave Vdf Vsat VrH IIB Conditions With all inputs at the VCC2 level With R/L = 3.5 /3.8 mH in each phase If = 1.0 A RL = 24 Pin 12 With pin 12 at 1 V 0 50 0.405 Ratings min typ 3.3 0.450 1.1 0.8 max 10 0.505 1.8 1.2 3.5 500 Unit mA A V V V nA Package Dimensions unit : mm 4168 SANYO : SIP-12 No.7464-2/8 STK672-210 Internal Circuit 5 4 oAB 8 oA 9 Vref 12 oBB 6 oB 7 VCC2 10 3 2 Off time setting Off time setting SP 11 SUB PG 1 Sample Application Circuit VCC2 = 5 V 10 oA oAB oB oBB 9 8 7 6 2 3 4 5 Stepping motor VCC1 = 24 V min. STK672-210 Ro1 Co2 = 10 F + Ro2 S.GND P.GND ITF02289 Co1 = 220 F 12 11 1 + * * * * The Co1 ground lead must be connected as close as possible to pin 1 on the hybrid IC. HC type CMOS levels are recommended as the input specifications for pins 6 to 9. Pull-up resistors must be used for TTL level inputs. (Recommended value: 2 k) Excitation control input specifications Corresponding output pin 2 3 4 5 Corresponding excitation control input signal Active: High oB oBB oA oAB Activ: Low oBB oB oAB oA No.7464-3/8 STK672-210 Phase signal: Active low input 2-phase excitation Clock Pin 6 Phase signal BB Pin 7 Phase signal B Pin 8 Phase signal AB Pin 9 Phase signal A Pin 2 MOSFET gate signal Pin 3 MOSFET gate signal Pin 4 MOSFET gate signal Pin 5 MOSFET gate signal 1-2 phase excitation Clock Pin 6 Phase signal BB Pin 7 Phase signal B Pin 8 Phase signal AB Pin 9 Phase signal A Pin 2 MOSFET gate signal Pin 3 MOSFET gate signal Pin 4 MOSFET gate signal Pin 5 MOSFET gate signal Phase signal: Active high input 2-phase excitation Clock Pin 6 Phase signal BB Pin 7 Phase signal B Pin 8 Phase signal AB Pin 9 Phase signal A Pin 2 MOSFET gate signal Pin 3 MOSFET gate signal Pin 4 MOSFET gate signal Pin 5 MOSFET gate signal 1-2 phase excitation Clock Pin 6 Phase signal BB Pin 7 Phase signal B Pin 8 Phase signal AB Pin 9 Phase signal A Pin 2 MOSFET gate signal Pin 3 MOSFET gate signal Pin 4 MOSFET gate signal Pin 5 MOSFET gate signal No.7464-4/8 STK672-210 Setting the Motor Current Peak Value (IOH) IOH Vref / Rs Vref: STK672-210 pin 12 input voltage Rs: STK672-210 internal current detection resistor (0.195 2%) IOH 0 Model of the Motor Phase Current Flowing into the Driver IC (pins 2, 3, 4, and 5) Vref = (Ro2 / (Ro1 + Ro2)) x VCC2 VCC2 = 5 V Current Switching Techniques Due to the input bias current (IIB) specifications, Ro1 must be under 100 k. The figures below present sample circuits that temporarily switch the motor current when, for example a held motor stops. We recommend using the circuit structure in the figure at the left to minimize as much as possible the effects of the saturation voltage of the reference voltage switching transistor. 5V 5V Ro1 Vref Ro1 Ro3 Ro2 Ro3 Ro2 Vref Switching Circuit 1 Input Pin Circuits Input pin Pin 6, 7, 8, and 9 Circuit type Switching Circuit 2 X phase (XB phase) MOSFET gate signal XB phase PWM signal 5V 10 k 10 k To XB phase 5V When switch 1 is in the ground position, the input resistor will be a 20 k pull-down resistor. Pin 12 VCC2 CR input Vref To one of the comparator GND No.7464-5/8 STK672-210 Thermal Design The size of the heat sink required for the STK672-210 depends on the motor output current IOH (A), the electrical characteristics of the motor, the excitation mode, and the basic drive frequency. The thermal resistance (c-a) of the required heat sink can be determined from the following formula. Tc max - Ta c - a = ------------ (C/W) Pd Tcmax: The STK672-210 substrate temperature (C) Ta: The STK672-210 ambient temperature (C) Pd: The average internal power dissipation in the STK672-210 (W) For example, the required area for a heat sink made from 2 mm thick aluminum can be determined from the graph at the right below. Note that the ambient temperature is greatly influenced by the ventilation and air flow patterns within the application. This means that the size of the heat sink must be determined with care so that the STK672-210 back surface (aluminum substrate) temperature Tc in the mounted state never exceeds, under any conditions that might occur, the temperature Tc = 105 C. 20 c-a -- Pd Heat sink thermal resistance, c-a -- C/W No Fin 23.0[C / W] Tc max=105C c-a= Tc max--Ta (C / W) Pd 100 7 5 3 2 c-a -- S No Fin 23.0[C / W] Mounted vertically Convection cooling Heat sink thermal resistance, c-a -- C/W 16 12 8 Gu temam aran pe bie tee ra nt d tu re 2m 10 7 5 3 2 mt hick Al p (W late ith (wi a fl th n at b o su 4 40C 50C 60C 0 2 4 6 8 10 12 14 16 18 20 lack rfac surf e fi ace nish ) fini sh) 0 1.0 10 2 3 5 7 100 2 3 5 IC internal average power dissipation, Pd -- W ITF01880 Heat sink area, S -- cm2 7 1000 ITF01881 STK672-210 Average Internal Power Dissipation Pd Of the devices that contribute to the STK672-210 average internal power supply, the devices with the largest power dissipation are the current control devices, the diodes that handle the regenerative current, the current detection resistor, and the predriver circuit. The following presents formulas for calculating the power dissipation for the different excitation (drive) modes. 2 phase excitation mode Pd2EX = (Vsat + Vdf) x 0.5 x Clock x IOH x t2 + 0.5 x Clock x IOH x (Vsat x t1 + Vdf x t3) 1-2 phase excitation mode Pd1-2EX = (Vsat + Vdf) x 0.25 x Clock x IOH x t2 + 0.25 x Clock x IOH x (Vsat x t1 + Vdf x t3) Motor hold mode PdHOLDEX = (Vsat + Vdf) x IOH Vsat: Ron voltage drop + shunt resistor combined voltage Vdf: FET internal diode Vdf + shunt resistor combined voltage Clock: Input clock CLK (the reference frequency prior to splitting into 4 phases) IOH 0A t1 t2 t3 ITF02290 Figure 1 Motor Output Current Waveform Model (Commutation Current) No.7464-6/8 STK672-210 t1: The time until the winding current reaches its rated current (IOH) t2: The time in the constant-current control (PWM) region t3: The time from the point a phase signal is cut until the back EMF current is dissipated. t1 = (-L/(R + 0.77) ln (1 - ((R + 0.77)/VCC1) x IOH) t3 = (-L/R) ln ((VCC1 + 0.77)/(IOH x R + VCC1 + 0.77) VCC1: Motor supply voltage (V) L: Motor inductance (H) R: Motor winding resistance () IOH: Set motor output current wave height (A) The constant-current control time t2, and the time T (= t1 + t2 + t3) that the phase signal is on in each excitation mode are as follows. 2 phase excitation mode: t2 = (2/Clock) - (t1 + t3) 1-2 phase excitation mode: t2 = (3/Clock) - t1 Determine the values for Vsat and Vdf by substitution using the graphs for Vsat vs IOH and Vdf vs IOH for the set current value for IOH. Then judge whether or not a heat sink is required from the determined average power dissipation for the STK672-210 by comparison with the Tc vs. Pd graph. Note that it is necessary to check the temperature rise in the actual application system case, since the STK672-210 substrate temperature Tc changes with the air convection conditions around the STK672-210 when a heat sink without fins is used. 3.5 Vsat -- IO 1.7 1.6 1.5 Vdf -- If Output saturation voltage, Vsat -- V 3.0 Forward voltage, Vdf -- V 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 2.5 Tc= C 25 C 105 2.0 1.5 Tc = C 5 10 25 C 1.0 0.5 0 0 0.5 1.0 1.5 2.0 2.5 ITF02291 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 Output current, IO -- A 0.45 0.40 Output current, If -- A 1000 7 5 ITF02292 Vref -- IOH IIH -- Tc IIH Input pin current, IIH, IIL -- A Reference voltage, Vref -- V 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 3 2 100 7 5 3 2 10 7 5 3 2 1.0 0 20 40 60 80 IIL 100 120 ITF02294 Motor current, IOH -- A ITF02293 Substrate temperature, Tc -- C No.7464-7/8 STK672-210 1.1 1.0 0.9 IOH -- Tc Substrate temperature rise, Tc -- C 90 80 70 60 50 40 30 20 10 0 Tc -- Pd Motor current, IOH -- A 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 120 ITF02295 0 0.5 1.0 1.5 2.0 2.5 3.0 ITF02296 Substrate temperature, Tc -- C 80 Tc -- CLK Hybrid IC internal power dissipation, Pd -- W 1.8 1.6 1.4 IOH -- Tc Motor running Motor hold state current Substrate temperature rise, Tc -- C 70 60 50 40 30 20 10 IOH = 1.3 A 2ex Motor current, IOH -- A 1.2 1.0 0.8 0.6 0.4 0.2 0 IOH = 1 A 2ex IOH = 1 A 1-2ex Motor voltage: 24 V Vertical, independent, heat sink without fins Natural convection Motor: R = 3.3 , L = 3 mH 2 3 5 7 1000 2 3 5 0 100 Conditions: Motor voltage = 24 V Motor: R = 0.4 , L = 1.2 mH 0 10 20 30 40 50 60 70 80 90 100 110 Input frequency, CLK -- Hz 7 10000 ITF02297 Substrate temperature, Tc -- C ITF02298 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 or all SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be expor ted without obtaining the expor t license from the author ities concerned 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 June, 2004. Specifications and information herein are subject to change without notice. PS No.7464-8/8 |
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