DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 9
Technical content
Dual Full-Bridge PWM Motor Driver AMM56219 The AMM56219 motor driver is designed to drive both windings of a bipolar stepper motor or to control bidirectionally two DC motors. Both bridges are capable of sustaining 45V and include internal pulse -width modulation (PWM) control of the output current to 750mA. The outputs have been optimized for a low output saturation voltage drop (less than 1.8V total source plus sink at 500mA). For PWM current control, the maximum output current is determined by the user’ s selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0, 33%, 67%, or 100% of the maximum level. A PHASE input to each bridge determines load current direction. The bridges include both ground clam p and fly- back diodes for protection against inductive transients. Internally generated delays prevent cross- over currents when switching current direction. Special power -up sequencing is not required. A thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits. The IC is supplied in SOP24 package . Its batwing construction provides for maximum package power dissipation in the smallest possible construction. Also, Pb free product is available ( Please refer to Marking Identification ). Applications Scanner, Printer Features 1) Interchangeable with SGS L6219DS 2) 750mA continuous output current 3) 45V output sustaining voltage 4) Internal clamp diodes 5) Internal PWM current control 6) Low output saturation voltage 7) Internal thermal shutdown circuitry Absolute Maximum Ratings at TJ ≤ 150℃ Parameter Symbol Limits Unit Motor supply voltage VBB 45 V Output current Peak IOUT +1.0 A Continuous +750 mA Logic supply voltage VCC 7.0 V Logic input voltage range VIN -0.3 ~ +7.0 V Output emitter voltage VSENSE 1.5 V Operating temperature range TA -20 ~ +85 ℃ Storage temperature range TS -55 ~ +150 ℃ *Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified peak current rating or a junction temperature of +150℃. AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 1 -
Thermal Data Description Symbol Value Unit Thermal Resistance Junction-case Rthjc 20 ℃/W Thermal Resistance Junction-ambient Rthja 76 ℃/W *With minimized copper area. Block Diagram VBB VCC PWM 2 OUT 1A OUT 2A SENSE 2 COMP IN 2 OUT 2B GROUND GROUND I 02 I 12 PHASE 2 VREF 2 RC 2 LOAD SUPPLY SENSE 1 COMP IN 1 OUT 1B I 01 GROUND GROUND I 11 PHASE 1 VREF 1 RC 1 LOGIC SUPPLY PWM 1 AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 2 -
PWM Current-Control Circuitry Channel 1 terminal numbers shown VBB 1 21 OUT B OUT A
23 SENSE
÷10 20I0 40 kΩ 10 kΩ 20 kΩ V REF TRUTH TABLE PHASE OUTA OUTB H H L L L H AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 3 -
Electrical Characteristics ( Unless otherwise specified, Ta = 25℃, Tj ≤ 150℃, VBB = 45V , VCC = 4.75V to 5.25V , VREF = 5.0V ) Parameter Symbol Conditions Limit Unit Min Typ Max ＜Output Drivers (OUTA or OUTB)＞ Motor supply range VBB 10 - 45 V Output leakage current ICEX VOUT = VBB - < 1.0 50 μA VOUT = 0 - < -1.0 -50 μA Output sustaining voltage VCE(sus) IOUT = ±750mA, L = 3.0mH 45 - - V Output saturation voltage VCE(SAT) Sink driver, IOUT = +500mA - 0.4 0.6 V Sink driver, IOUT = +750mA - 1.0 1.2 V Source driver, IOUT = -500mA - 1.0 1.2 V Source driver, IOUT = -750mA - 1.3 1.5 V Clamp diode leakage current IR VR = 45V - < 1.0 50 μA Clamp diode forward voltage VF IF = 750mA - 1.6 2.0 V Driver supply current IBB(ON) Both bridges ON, no load - 20 25 mA IBB(OFF) Both bridges OFF - 5.0 10 mA ＜Control Logic ＞ Input voltage VIN(1) All inputs 2.4 - - V VIN(0) All inputs - - 0.8 V Input current IIN(1) VIN = 2.4V - < 1.0 20 μA VIN = 0.8V - -3.0 -200 μA Reference voltage range VREF Operating 1.5 - 7.5 V Current limit threshold (at trip point) VREF/ VCOMPIN I0 = I1 = 0.8V 9.5 10 10.5 - I0 = 2.4V , I1 = 0.8V 13.5 15 16.5 - I0 = 0.8V , I1 = 2.4V 25.5 30 34.5 - Thermal shutdown temperature TJ - 170 - ℃ Total logic supply current ICC(ON) I0 = I1 = 0.8V , No load - 40 50 mA ICC(OFF) I0 = I1 = 2.4V , No load - 10 12 mA AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 4 -
Application Information
- PWM Current control The AMM56219 dual bridge is designed to drive both windings of a bipolar stepper motor or to control bidirectionally two DC motors. The output current of each part is sensed and controlled independently in each bridge by external sense resistors (RS), internal comparator, and monostable multivibrator. When the bridge is turned ON, current increases in the motor winding and it is sensed by the external sense resistor until the sense voltage (V COMPIN) reaches the level set at the comparator’s input: ITRIP = VREF / 10RS The comparator then triggers the monostabel that turns OFF the source driver of the bridge. The actual load current peak will be slightly higher than the trip point (especially for low -inductance loads) because of the internal logic and switching delays. This delay (t d) is typically 2 μs. After turn -off, the motor current decays, circulating through the ground-clamp diode and sink transistor. The source driver’s OFF time (and therefore the magnitude of the current decrease) is determined by the monostable’s external RC timing components, where t off = RTCT within the range of 20kΩ to 100kΩ and 100pF to 1000pF. When the source driver is re- enabled, the winding current (the sense voltage) is again allowed to rise to the comparator’s threshold. This cycle repeats itself, maintaining the average motor winding current at the desired level. Loads with highly distributed capacitances may result in high turn-ON current peaks. This peak (appearing across R will attempt to trip the comparator, resulting in erroneous current contr ol or high-frequency oscillations. An external RCCC time delay should be used to further delay the action of the comparator. Depending on load type, many applications will not require these external components (SENSE connected to COMP IN). Load Current Paths VBB RS BRIDGE ON SOURCE OFF ALL OFF PWM Output Current Wave Form V PHASE I TRIP t offt d I OUT AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 5 -
- Logic Control Of Output Current Two logic level inputs (I0 and I1) allow digital selection of the motor winding current at 100%, 67%, 33%, or 0% of the maximum level (see table). The 0% output current condition turns OFF all drivers in the bridge and can be used as an OUTPUT DISABLE function. Current – Control Truth Table I0 I1 Output Current L L VREF / 10RS = ITRIP H L VREF / 15RS = 2/3 ITRIP L H VREF / 30RS = 1/3 ITRIP H H 0 These logic level inputs greatly enhance the implementation of μP-controlled drive formats. During half-step operations, the I 0 and I1 allow the μP to control the motor at a constant torque between all positions in an eight -step sequence. This is a accomplished by digitally selecting 100% drive current when only one phase is ON and 67% drive current when two phases are ON. Logic highs on both I0 and I1 turn OFF all drivers to allow rapid current decay when switching phases. This helps to ensure proper motor operation at high step rates. The logic control inputs can also be used to select a reduced current level (and reduced power dissipation) for ‘hold’ conditions and/or increased current (and available torque) for start-up conditions. General The PHASE input to each bridge determines the direction of current flow in the motor winding. An internally generated deadtime (approximately 2μs) prevents crossover currents that can occur when switching the PHASE input. All four driv ers in the bridge output can be turned OFF between steps (I 0 = I1 ≧ 2.4V) resulting in a fast current decay through the internal output clamp and flyback diodes. The fast current decay is desirable in half -step and high-speed applications. All inputs float high. Varying the reference voltage (V REF) provides continuous control of the peak load current for microstepping applications and DC motor control. Thermal protection circuitry turns OFF all drivers when the junction temperature reaches +170 ℃. It is only intended to protect the device from failures due to excessive junction temperature and should not imply that output short circuits are permitted. The output drivers are re-enabled when the junction temperature cools to +145℃. The AMM56219 output dri vers are optimized for low output saturation voltages – less than 1.8V total (source plus sink) at 500mA. Under normal operating conditions, when combined with the excellent thermal properties of the batwing packing design, this allows continuous operation of both bridges simultaneously at 500mA. AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 6 -
Typical Application μP FROM VREF C T R T + 5V VBB VCC PWM 1 RC RS CC RC RS CC VBB μP PWM 2 VREF FROM C T R T AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 7 -
Package Outline SOP24 SYMBOL MILLIMETERS INCHES Min. Max. Min. Max. A 2.28 2.65 0.090 0.104 A1 0.10 0.30 0.004 0.012 B 0.33 0.51 0.013 0.020 D 15.2 15.60 0.598 0.614 E 7.4 7.6 0.291 0.299 E1 10 10.75 0.394 0.423 e 1.27 (TYP) 0.05(TYP) L 0.41 1.27 0.016 0.050 Θ° 0° 8° 0° 8° AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 8 -
Marking Identification Row I AMtek Row II Part number Row III Lot number + L/F (Note: L/F is mean Lead free) Row IV Manufacturing code Marking type: Laser Marking AAMMtteekk sseemmiiccoonndduuccttoorrss SSEEPP.. 22001155 VV11..55 - 9 -