Ordering number : ENN7464 SANYO Semiconductors DATA SHEET Unipolar Constant-Current Chopper STK672-210 Two-Phase Stepping Motor Driver Output Current: 1.4 A Overview 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 = 25°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage 1 VCC1 max No signal 52 V Maximum supply voltage 2 VCC2 max No signal –0.3 to +7.0 V –0.3 to +7.0 V Input voltage VIN max Logic input pins Phase output current IOH max 0.5 s, 1 pulse, when VCC1 is applied 2.2 A Repeated avalanche capacity Ear max 25 mJ Allowable power dissipation Pd max With an arbitrarily large heat sink. Per MOSFET 6.5 W Operating substrate temperature Tc max 105 °C Junction temperature Tj max 150 °C Storage temperature Tstg –40 to +125 °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 = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage 1 VCC1 With signals applied 10 to 45 Supply voltage 2 VCC2 With signals applied 5.0 ± 5% V 0 to VCC2 V 100 V 1.4 A 1.6 A Input voltage VIH Phase driver withstand voltage VDSS Phase current 1 IOH max 1 Phase current 2 IOH max 2 ID = 1 mA (Tc = 25°C) When the pin 6 to 9 signals are ≥ 100 Hz, Tc = 105°C, 50% duty When the pin 6 to 9 signals are ≥ 100 Hz, Tc = 90°C, 50% duty V Electrical Characteristics at Tc = 25°C, VCC1 = 24 V, VCC2 = 5 V Parameter Symbol Control supply current ICCO Output current (average) IO ave Conditions typ With all inputs at the VCC2 level With R/L = 3.5 Ω/3.8 mH in each phase FET diode forward voltage Vdf If = 1.0 A Output saturation voltage Vsat RL = 24 Ω Vref input voltage VrH Pin 12 Vref input bias current Ratings min 0.405 Unit max 3.3 10 0.450 0.505 A 1.1 1.8 V 0.8 0 mA 1.2 V 3.5 V 500 nA IIB With pin 12 at 1 V VIH H-IC pins 6 to 9 VIL H-IC pins 6 to 9 IIH H-IC pins 6 to 9, VIN = VCC2 310 µA IIL H-IC pins 6 to 9, VIN = 0 V 2.5 µA 50 [Control Input Pins] Input voltage Input current 3.5 V 0.7 V Note: A fixed-voltage power supply must be used. Package Dimensions unit : mm 4168 SANYO : SIP-12 No.7464-2/8 STK672-210 Internal Circuit 5 øAB 8 4 øA 9 Vref 12 øBB 6 Off time setting øB 7 VCC2 10 3 2 Off time setting SP 11 PG 1 SUB Sample Application Circuit VCC2 = 5 V 10 øA 9 2 øAB 8 3 øB 7 4 øBB 6 5 VCC1 = 24 V min. Stepping motor STK672-210 Co1 = 220 µF Ro1 + 12 Co2 = 10 µF + 11 1 Ro2 S.GND P.GND ITF02289 • • • • 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 kΩ) Excitation control input specifications Corresponding output pin Corresponding excitation control input signal Active: High Activ: Low 2 øB øBB 3 øBB øB 4 øA øAB 5 øAB øA No.7464-3/8 STK672-210 Phase signal: Active low input 2-phase excitation Clock 1-2 phase excitation Clock Pin 6 Phase signal BB Pin 6 Phase signal BB Pin 7 Phase signal B Pin 7 Phase signal B Pin 8 Phase signal AB Pin 8 Phase signal AB Pin 9 Phase signal A Pin 9 Phase signal A Pin 2 MOSFET gate signal Pin 2 MOSFET gate signal Pin 3 MOSFET gate signal Pin 3 MOSFET gate signal Pin 4 MOSFET gate signal Pin 4 MOSFET gate signal Pin 5 MOSFET gate signal Pin 5 MOSFET gate signal Phase signal: Active high input 2-phase excitation 1-2 phase excitation Clock Clock Pin 6 Phase signal BB Pin 6 Phase signal BB Pin 7 Phase signal B Pin 7 Phase signal B Pin 8 Phase signal AB Pin 8 Phase signal AB Pin 9 Phase signal A Pin 9 Phase signal A Pin 2 MOSFET gate signal Pin 2 MOSFET gate signal Pin 3 MOSFET gate signal Pin 3 MOSFET gate signal Pin 4 MOSFET gate signal Pin 4 MOSFET gate signal Pin 5 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 Ω ±2%) IOH 0 Model of the Motor Phase Current Flowing into the Driver IC (pins 2, 3, 4, and 5) Vref = (Ro2 ÷ (Ro1 + Ro2)) × VCC2 VCC2 = 5 V Current Switching Techniques Due to the input bias current (IIB) specifications, Ro1 must be under 100 kΩ. 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 Vref Ro2 Ro3 Switching Circuit 1 Ro2 Switching Circuit 2 Input Pin Circuits Input pin Circuit type Pin 6, 7, 8, and 9 X phase (XB phase) MOSFET gate signal XB phase PWM signal 5V 10 kΩ 10 kΩ Pin 12 To XB phase 5V When switch 1 is in the ground position, the input resistor will be a 20 kΩ pull-down resistor. 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 (θc-a) of the required heat sink can be determined from the following formula. Tc max – Ta (°C/W) θc – a = —————— 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. θc-a — Pd 16 θc-a= Tc max--Ta (°C / W) Pd Gu temam aran pe bie tee ra nt d tu re 12 8 40°C 50°C 60°C 4 θc-a — S 100 No Fin 23.0[°C / W] Tc max=105°C Heat sink thermal resistance, θc-a — °C/W Heat sink thermal resistance, θc-a — °C/W 20 0 No Fin 23.0[°C / W] 7 5 Mounted vertically Convection cooling 3 2 2m mt hick 10 7 Al p late (W ith 5 a fl (wi th n o su at b 3 lack rfac surf ace 2 e fi nish ) fini sh) 1.0 0 2 4 6 8 10 12 14 16 18 20 10 2 3 5 7 2 100 Heat sink area, S — cm2 IC internal average power dissipation, Pd — W 3 5 7 1000 ITF01881 ITF01880 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) × 0.5 × Clock × IOH × t2 + 0.5 × Clock × IOH × (Vsat × t1 + Vdf × t3) 1-2 phase excitation mode Pd1-2EX = (Vsat + Vdf) × 0.25 × Clock × IOH × t2 + 0.25 × Clock × IOH × (Vsat × t1 + Vdf × t3) Motor hold mode PdHOLDEX = (Vsat + Vdf) × 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) × IOH) t3 = (–L/R) ln ((VCC1 + 0.77)/(IOH × R + VCC1 + 0.77) VCC1: Motor supply voltage (V) L: Motor inductance (H) R: Motor winding resistance (Ω) 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. Vsat — IO 1.6 1.5 3.0 2.5 2.0 1.5 C 5° 10 = Tc °C 25 1.0 1.4 1.3 C 25° Tc= 1.2 1.1 1.0 °C 105 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.5 0 0 0.5 1.0 1.5 2.0 Output current, IO — A 2.5 0 0.2 0.4 0.6 0.8 Input pin current, IIH, IIL — µA 0.40 0.30 0.25 0.20 0.15 0.10 0.05 1.2 1.4 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Motor current, IOH — A 1.8 2.0 2.2 ITF02293 1.8 2.0 2.2 ITF02292 IIH 3 2 100 7 5 3 2 10 7 5 3 2 IIL 1.0 0 1.6 IIH — Tc 1000 7 5 0.35 1.0 Output current, If — A ITF02291 Vref — IOH 0.45 Reference voltage, Vref — V Vdf — If 1.7 Forward voltage, Vdf — V Output saturation voltage, Vsat — V 3.5 0 20 40 60 80 Substrate temperature, Tc — °C 100 120 ITF02294 No.7464-7/8 STK672-210 IOH — Tc 1.1 Substrate temperature rise, ∆Tc — °C 1.0 Motor current, IOH — A 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 20 40 60 80 100 Substrate temperature, Tc — °C 60 50 40 30 20 10 0 120 50 IOH = 1 A 2ex IOH = 1 A 1-2ex 30 Motor voltage: 24 V Vertical, independent, heat sink without fins Natural convection Motor: R = 3.3 Ω, L = 3 mH 0 100 2 3 5 7 1000 1.5 2.0 2.5 3.0 ITF02296 IOH — Tc Motor running 1.6 60 40 1.0 1.8 IOH = 1.3 A 2ex 70 0.5 Hybrid IC internal power dissipation, Pd — W Motor current, IOH — A Substrate temperature rise, ∆Tc — °C 70 ITF02295 ∆Tc — CLK 80 10 80 0 0 20 ∆Tc — Pd 90 1.4 Motor hold state current 1.2 1.0 0.8 0.6 0.4 Conditions: Motor voltage = 24 V Motor: R = 0.4 Ω, L = 1.2 mH 0.2 0 2 3 Input frequency, CLK — Hz 5 7 10000 ITF02297 0 10 20 30 40 50 60 70 80 90 100 110 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