Ordering number : ENN7318 Monolithic Digital IC LB11947 PWM Current Control DC Motor Driver/ 5 V Switching Regulator Overview Package Dimensions The LB11947 is a PWM current control DC motor driver with 5-V switching regulator. This IC can simultaneously drive two DC motors. It is especially suitable for the applications of DC motors that control motor speed with direct PWM technique using external control signals. unit: mm 3147C-DIP28H [LB11947] 28 15 12.7 11.2 0.4 R1.7 1 14 20.0 4.0 26.75 4.0 (DC motor drive) * Driving two DC motors * External PWM control function * Internal PWM current control (OFF time fixed) * Current decay switching function (SLOW DECAY and FAST DECAY modes) * Noise canceling function * Output Tr upper diode incorporated (with external lower side Schottky diode) * Thermal shutdown circuit incorporated (with a heat generation warning function) * Logic low-voltage OFF circuit incorporated (Switching regulator) * PWM oscillation frequency variable (external C necessary) * Soft start function (external C necessary) * Over-current protection function 8.4 Functions (1.81) 1.78 0.6 1.0 SANYO: DIP28H (500 mil) 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 20203AS (OT) No. 7318 -1/14 LB11947 Specifications Absolute Maximum Ratings at Ta = 25C Parameter Symbol Maximum supply voltage VBBmax Output peak current IOPEAK Output continuous current Iomax Logic input voltage range VIN Emitter output maximum voltage VEmax VREF pin input voltage range VREF Operating temperature Conditions Ratings Tw 20s PWM = "L", Motor driver not operating Topr Storage temperature Tstg Allowable internal loss Pdmax Unit 50 V 1.75 A 1.5 A -0.3 to VCC + 0.3 V 1.0 V -0.3 to VCC + 0.3 V -20 to +85 C -55 to +150 C 3.0 W Independent IC Recommended Operating Conditions at Ta = 25C Parameter Symbol Supply voltage Reference voltage OSC oscillation frequency Conditions Ratings Unit VBB 10 to 45 VREF 0.0 to 3.0 V V fosc 50 to 100 kHz Allowable Power Dissipation, Pd max - W Pd max - Ta 3.5 Independent IC 3 2.5 2 1.56 1.5 1 0.5 0 -20 0 20 40 60 80 100 Ambient Temperature, Ta - C No. 7318 -2/14 LB11947 Electrical Characteristics at Ta = 25C, VBB = 45 V, VREF = 1.0 V Parameter Symbol Conditions Ratings min typ Unit max Standby current dissipation IBB ST ST = L 3 4.5 6 mA Operating current dissipation IBB ON ST = H, Motor driver no-load 7 10 13 mA Motor Driver Block Output saturation voltage 1 VOSAT 1 IO = +1.0 A, sink 1.2 1.5 V Output saturation voltage 2 VOSAT 2 IO = +1.5 A, sink 1.5 1.8 V Output saturation voltage 3 VOSAT 3 IO = -1.0 A, source 1.9 2.3 V Output saturation voltage 4 VOSAT 4 IO = -1.5 A, source 2.2 2.5 V 50 A Output leak current Output sustaining voltage Logic input voltage (PWM,PHASE,MD,ST) Logic input current (PWM,PHASE,MD,ST) Sense voltage Reference current IO1 (leak) ST = 0 V, VO = VBB, sink IO2 (leak) ST = 0 V, VO = 0 V, source VSUS L = 26.6 mH, IO = 1.5 A VIH Ta = 25C VIL Ta = 25C Ta = -20 to 85C *1 Ta = -20 to 85C *1 IIL VIL = 0.8 V IIHT VIH = VCC, Ta = -20 to 85C IILT VIH = 0.8 V, Ta = -20 to 85C 10 3 A 15 A 150 A 20 A V VE10 VREF = 1.0 V 0.190 0.2 0.210 V VE05 VREF = 0.5 V 0.092 0.1 0.108 V 0.5 A -0.92 mA 1.2 s 1.2 s Iref Vref = 1.0 V -0.5 tDO PWM output delay time Thermal shutdown temperature 5 40 V 120 0.513 CR = 1.0 V Heat-generation warning temperature 90 0.5 C = 2200pF, R = 16 k LVSD hysteresis width *1 60 0.483 ICR TEO pin saturation voltage *1 V 0.8 VREF = 2.5 V tNC Logic OFF voltage V V VE25 CR pin current Measurement of through current V 2 Minimum noise cancel time Output delay time A 50 0.8 VILT VIH = VCC -50 2 VIHT IIH *1 tDOT ITR Ta = -20 to 85C -1.38 s *3 *1 Pulse width of 500 ns or more VLSDOFF VLHIS VsatTEO -1.15 5 *2 Iload = -3 mA, Ta = 150C *4 6.4 8 0.77 1.1 *1 1 A 9.6 V 1.43 V 0.45 V TE *1 135 C TSD *1 180 C Switching Regulator Block Output voltage VCC 4.85 Fluctuation of supply voltage VCC1 VBB = 10 to 45 V Load fluctuation VCC2 IO = 0 to 0.5 A V 50 mV 50 mV VtIP Over-current detection delay time TdIP fosc = 50kHz OSC pin charge current Icosc V(OSC) = 1.0 V -24 -20 -16 OSC pin discharge current Idosc V(OSC) = 2.5 V 16 20 24 A 100 kHz 4 A Soft start charge current 0.5 5.15 Output over-current Detection threshold voltage OSC maximum oscillation frequency 0.45 5.0 80 Foscmax Iss V(CSS) = 0 V 0.55 2 3 V s A No. 7318 -3/14 LB11947 * Note 1: Design guarantee * Note 2: Measurement of minimum noise canceling time PWM 1s 4V CR TNC VM = 45 V, VREF = 2.5 V, C = 2200pF, R = 16 k Enter the PWM "L" pulse width of 1s and measure the time TNC from PWM rise to the CR pin voltage of 4 V. * Note 3: Output delay time measurement PWM 40V OUT 5V TDO1 TDO2 VM = 45 V, PH = "H", CR = 0V Measure the time TDO1 from PWM = "H" "L" fall to the output fall to 5 V and TDO2 from PWM = "L" "H" rise to the output rise to 40 V. Measure these times for OUTA, OUTAB, OUTB, and OUTBB respectively. * Note 4: Measurement of through current PHASE 1A Pin E 500ns Measure the current flowing to pin E during phase switching of "H" "L" and "L" "H" after its conversion to the voltage with a detection resistor. The current exceeding the current value of 1A at the pulse width of 500 ns or more is judged to be NG as the through current. No. 7318 -4/14 LB11947 Pin functions description Pin Name Pin No. OUTBB 1 Functions DC motor, BB output pin EB 2 DC motor Bch, current sense resistor connection pin DCO 3 Switching regulator, control transistor output pin VCC 4 Switching regulator, 5 V voltage output pin IPSEN 5 Switching regulator, over-current detection resistor connection pin VBB 6 Supply voltage connection pin VMB 7 DC motor Bch, motor load current supply power connection pin CSS 8 Switching regulator, soft start capacitor connection pin TEO 9 Heat generation warning output, open collector pin OSC 10 Switching regulator, switching frequency decesion capacitor connection pin ST 11 DC motor, standby input pin CRB 12 DC motor Bch, noise cancel, TOFF time setting C and R connection pin VREFB 13 DC motor Bch, current setting reference voltage input pin CRA 14 DC motor Ach, noise cancel, TOFF time setting C and R connection pin VREFA 15 DC motor Ach, current setting reference voltage input pin MDB 16 DC motor Bch, current decay mode switching pin (for PWM = "L" only) PWMB 17 DC motor Bch, PWM input pin PHB 18 DC motor Bch, phase switching input pin MDINT 19 DC motor, current decay mode switching pin (for PWM = "H" only) MDA 20 DC motor Ach, current decay mode switching pin (for PWM = "L" only) PWMA 21 DC motor Ach, PWM input pin PHA 22 DC motor Ach, phase switching input pin GND 23 GND connection pin VMA 24 DC motor Ach, motor load current supply power connection pin EA 25 DC motor Ach, current sense resistor connection pin OUTA 26 DC motor, A output pin OUTAB 27 DC motor, AB output pin OUTB 28 DC motor, B output pin OUTB OUTAB OUTA EA VMA GND PHA PWMA MDA MDINT PHB PWMB MDB VREFA Pin Assignment 28 27 26 25 24 23 22 21 20 19 18 17 16 15 2 3 4 5 6 7 8 9 10 11 12 13 EB DCO VCC IPSEN VBB VMB CSS TEO OSC ST CRB VREFB 14 CRA 1 OUTBB LB11947 No. 7318 -5/14 LB11947 Descriptions of Each Function (Switching regulator, over-current limit operation time chart) 45V VBB 8V 9V 5V VCC OFF VCC 4V CSS 1.3V Over-current detection threshold IPSEN Charge mask section OSC Soft start Mask threshold level Over-current mask width Over-current detection output Logic RESET Output OFF latch "HI" RESET Output OFF latch cancelled Output OFF latch Latch canceling The DC/DC over-current limit value is determined from the resistor connected between VBB and current sense pin. Current limit value = 0.5(V)/RL Using about 75% from the upper threshold to lower threshold of the OSC triangular oscillation waveform and using the mask circuit within the OSC charge section, the output of the over-current detection comparator is masked. This can prevent detection error due to output switching noise. When over-current flows through the output transistor, this over-current is detected if the ON width exceeding the overcurrent detection threshold of IPSEN pin is more than the mask width. The counter is activated when over-current is detected. If over-current is detected further after counting of four shots of OSC oscillation frequency, the output transistor is turned OFF and latched in this condition. If no over-current is detected up to the eighth shot after counting of four shots, the over-current condition is determined to be cancelled and the counter is reset, but the output transistor is not turned OFF. If the output transistor is latched to the OFF condition, recharge of VBB power supply causes canceling of the latch condition. No. 7318 -6/14 LB11947 (Switching regulator, soft start function) When the VCC output is about to rise to the target voltage of 5 V instantaneously at start of switching regulator (at VBB power ON), the IC output pulse operates with the maximum duty, causing the rush current to flow to the output transistor. It is therefore necessary to raise the VCC target voltage gradually so that the output does not operate with the maximum duty. Connection of a capacitor between the CSS pin (pin 8) and GND allows slow rising of VCC output (soft start) when VBB power is applied. The soft start time (tss) is approximately set by the following equation. VBB 9V 1.4V CSS 5V VCC tss tss .=. 1.4 x C/Iss tss: Soft start time Iss: Soft start charge current C: CSS pin capacitor [s] [A] [F] (Switching regulator, switching frequency set time) The switching frequency of switching regulator is varied by changing the capacitor connected between the OSC pin (pin 10) and GND. The switching frequency (fosc) is set approximately by the following equation. Since this equation is the approximate expression, check it in the mounted condition when it is to be used at a particularly high frequency. fosc .=. {1/C(1/Icosc+1/Idosc)} x 10-3 fosc: Switching frequency [kHz] Icosc: OSC pin charge current [A] Idosc: OSC pin discharge current [A] C: OSC pin capacitor [pF] No. 7318 -7/14 LB11947 (Motor driver, logic input truth table) ST PWM MD MDINT PH OUT OUT- L * * * * OFF OFF Operation mode H H * H H H L SLOW (short brake) at power ON, forward rotation, and at the current limit H H * L H H L FAST (all OFF) at power ON, forward rotation, and at current limit H H * H L L H SLOW (short brake) at power ON, reverse rotation, and at current limit H H * L L L H FAST (all OFF) at power ON, reverse rotation, and at current limit H L H * * L L Current decay at SLOW (short brake) H L L * * OFF OFF Standby mode (circuit OFF) Current decay at FAST (all OFF) (*) Don't care. (Motor driver, output stage transistor operation mode) Charge Fast VM Slow VM VM U1 U2 ON OFF U1 OFF L2 L1 OFF U1 U2 OFF OFF OFF L1 L2 L2 L1 OFF ON U2 OFF RS ON RS ON RS The figure above shows the current direction at PH = "H." Note that the upper diode is incorporated and the lower diode is an external Schottky diode. (Motor driver, output stage transistor operation function) Mode U1 U2 L1 L2 CHARGE(PH = "H") ON OFF OFF ON CHARGE(PH = "L") OFF ON ON OFF FAST OFF OFF OFF OFF SLOW OFF OFF ON ON No. 7318 -8/14 LB11947 (Motor driver, internal PWM current control operation mode) PWM current control is made, so that the peak current flowing through the motor coil with PWM = "H" does not exceed the current level swt with VREF pins (pin 15 (Ach) and pin 13 (Bch)). <MDINT = "L" (FAST mode> PWM Set current Coil current 4V CR 1V Toff Tnc Toff Tnc CHARGE mode FAST mode CHARGE mode FAST mode <MDINT = "H" (SLOW mode)> PWM Set current Coil current 4V CR 1V Toff Tnc CHARGE mode Toff Tnc SLOW mode CHARGE mode SLOW mode Tnc: Noise canceling time [s] Toff: Switching OFF time [s] No. 7318 -9/14 LB11947 (Switching OFF time and noise canceling time set method) Connection of C and R between CRA pin (pin 14), CRB pin (pin 12) and GND allows setting of the switching OFF time and noise canceling time. The noise canceling time Tnc and switching OFF time Toff is set approximately by the following equation. [Noise canceling time Tnc] Tnc .=. C * R * ln{(1-RI)/(4-RI)}[s] [Switching OFF time Toff] Toff .=. - C * R * ln(1/4.8) [s] I C R : CR pin charge current : CR pin external capacitor : CR pin external resistor [A] [F] [] (Peak coil current set method) The peak current value (set current) flowing through the motor coil is set by the sense resistor to sense the current connected between EA pin (pin 25), EB pin (pin 2) and GND and by the reference voltage applied to VREFA pin (pin 15) and VREFB pin (pin 13). Ipeak = Vref/(5 x Rs) Ipeak : Set current [A] Vref : VREF pin application voltage [V] Rs : Current sense resistor [] No. 7318 -10/14 LB11947 (Motor driver, output transistor operation time chart) MDINT = "H", MD = "H" (SLOW, SLOW) PHASE H PWM L OUTA upper Tr OFF OUTA upper Tr OFF OUTA lower Tr ON OUTA lower Tr ON CR 1s or less 1s or less 1s or less 1s or less 1s or less 1s or less 1s or less 1s or less Current mode CHG SLOW CHG OFF(SLOW) CHG SLOW MDINT = "L", MD = "L" (FAST, FAST) PHASE H PWM L OUTA upper Tr OFF OUTA upper Tr OFF OUTA lower Tr OFF OUTA lower Tr OFF CR 1s or less Current mode CHG 1s or less FAST CHG 1s or less 1s or less 1s or less OFF(FAST) CHG FAST No. 7318 -11/14 LB11947 MDINT = "L", MD = "H" (FAST, SLOW) PHASE H PWM L OUTA upper Tr OFF OUTA upper Tr OFF OUTA lower Tr ON OUTA lower Tr ON CR 1s or less Current mode 1s or less 1s or less CHG FAST CHG 1s or less 1s or less 1s or less OFF(SLOW) CHG FAST MDINT = "H", MD = "L" (SLOW, FAST) PHASE H PWM L OUTA upper Tr OFF OUTA upper Tr OFF OUTA lower Tr OFF OUTA lower Tr OFF CR 1s or less Current mode 1s or less 1s or less CHG SLOW CHG 1s or less 1s or less 1s or less 1s or less OFF(FAST) CHG SLOW No. 7318 -12/14 GND VBB VREF ST MD PWM PHA CSS VBB OUTB SB M One-shot multi blanking time OUT SB 0.51 EA 16k CRA 2000pF 0.1F OSC OSC 200pF VBB 0.51 IPSEN CURRENT LIMITTER VCC 470H DCO 470F VCC 16k CRB 2000pF EB 1/5 ATT *The external constant is reference and may vary depending on the motor to be connected. Check with care when determining the constant. TEO 1/5 ATT circuit Thermal shutdown circuit UVLO VMB circuit SOFT START OUT A VMA Control logic One-shot multi blanking time OUT SB Control logic SB M 0.51 VREF MDIN MDB PWM PHB LB11947 Block Diagram No. 7318 -13/14 LB11947 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 exported without obtaining the export license from the authorities 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 February, 2003. Specifications and information herein are subject to change without notice. PS No. 7318 -14/14