BD6423EFV

1/4 STRUCTURE PRODUCT SERIES TYPE FUNCTION Silicon monolithic integrated circuits Bipolar stepping motor driver BD6423EFV ・PWM constant current controllable two H bridge driver ・Built-in translator circuit for CLK-IN control ・Full, Half, and Quarter step modes ・Mix decay control ○Absolute maximum ratings(Ta=25℃) Item Supply voltage Limit Unit -0.2～+45.0 V ※1 W 1.1 Power dissipation Pd 4.0※2 W Input voltage for control pin VIN -0.2～+5.5 V RNF maximum voltage VRNF 0.7 V Maximum output current IOUT 1.0※3 A/phase Operating temperature range Topr -25～+85 ℃ Storage temperature range Tstg -55～+150 ℃ Junction temperature Tjmax 150 ℃ ※1 70mm×70mm×1.6mm glass epoxy board. Derating in done at 8.8mW/℃ for operating above Ta=25℃. ※2 4-layer recommended board. Derating in done at 32.0mW/℃ for operating above Ta=25℃. ※3 Do not, however exceed Pd, ASO and Tjmax=150℃. Symbol VCC1,2 ○Operating conditions (Ta=-25～+85℃) Item Symbol Supply voltage VCC1,2 Output current IOUT ※4 Do not, however exceed Pd, ASO. Min 19 - Typ 37 0.5 Max 42 0.7※4 Unit V A/phase This product isn’t designed for protection against radioactive rays. REV. A 2/4 ○Electrical characteristics (Unless otherwise specified Ta=25℃, VCC1,2=37V) Item Symbol Min. Limit Typ. Max. Unit Conditions Whole Circuit current at standby ICCST 1.0 2.5 Circuit current ICC 2.0 5.0 Control input (CLK, CW_CCW, MODE0, MODE1, ENABLE, DEC1, DEC2, PS) H level input voltage VINH 2.0 L level input voltage VINL 0.8 H level input current IINH 35 50 100 L level input current IINL -10 0 Output (OUT1A, OUT1B, OUT2A, OUT2B) Output ON resistance Output leak current Current control RNFX input current VREF input current VREF input voltage range Comparator threshold Minimum on time (Blank time) RON ILEAK IRNF IVREF VREF VCTH tONMIN -40 -2.0 0 0.57 0.5 2.0 -20 -0.1 0.60 1.5 2.6 10 3.0 0.63 3.0 mA mA V V μA μA PS=L PS=H, VREF=3V VIN=5V VIN=0V IOUT=0.5A, Sum of upper and lower Ω μA μA μA V V μs RNFX=0V VREF=0V VREF=3V C=470pF, R=82kΩ REV. A 3/4 ○Package outline Product No. BD6423 Lot No. HTSSOP-B24 (Unit:mm) ○Block diagram ○Pin No. / Pin name Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 Pin name GND OUT1B RNF1 OUT1A VCC1 NC GND CR DEC1 DEC2 VREF PS Pin No. 13 14 15 16 17 18 19 20 21 22 23 24 Pin name CLK CW_CCW TEST MODE0 MODE1 ENABLE NC VCC2 OUT2A RNF2 OUT2B NC CLK 13 CW_CCW 14 MODE0 16 MODE1 17 ENABLE 18 Translator RESET Regulator 7 GND 12 PS UVLO TSD OCP VREF 11 ＋ － 2bit DAC 5 VCC1 RNF1 ＋ － 4 OUT1A 2 OUT1B 3 RNF1 Control logic RNF2 ＋ － Blank time PWM control CR 8 DEC1 9 DEC2 10 TEST 15 OSC Mix decay control Predriver 20 VCC2 21 OUT2A 23 OUT2B 22 RNF2 NC : Non Connection 1 GND REV. A 4/4 ○Operation Notes (1) Absolute maximum ratings An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices, such as fuses. (2) Power supply lines As return of current regenerated by back EMF of motor happens, take steps such as putting capacitor between power supply and GND as an electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. (3) GND potential The potential of GND pin must be minimum potential in all operating conditions. (4) Metal on the backside (Define the side where product markings are printed as front) The metal on the backside is shorted with the backside of IC chip therefore it should be connected to GND. Be aware that there is a possibility of malfunction or destruction if it is shorted with any potential other than GND. (5) Thermal design Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. This IC exposes its frame of the backside of package. Note that this part is assumed to use after providing heat dissipation treatment to improve heat dissipation efficiency. Try to occupy as wide as possible with heat dissipation pattern not only on the board surface but also the backside. (6) Actions in strong electromagnetic field Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to malfunction. (7) ASO When using the IC, set the output transistor so that it does not exceed absolute maximum ratings or ASO. (8) Thermal shutdown circuit The IC has a built-in thermal shutdown circuit (TSD circuit). If the chip temperature becomes Tjmax=150℃, and higher, coil output to the motor will be open. The TSD circuit is designed only to shut the IC off to prevent runaway thermal operation. It is not designed to protect or indemnify peripheral equipment. Do not use the TSD function to protect peripheral equipment. (9) Ground Wiring Pattern When using both large current and small signal GND patterns, it is recommended to isolate the two ground patterns, placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change the GND wiring pattern of any external components, either. (10) Mounting errors When attaching to a printed circuit board, pay attention to the direction of the IC and displacement. Improper attachment may lead to destruction of the IC. (11) TEST pin Be sure to connect TEST pin to GND. REV. A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. R1120A