TCA3727G

TCA3727 INFINEON | Alldatasheet

Document overview

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Technical content

Features

• 2 × 0.75 amp. / 50 V outputs
• Integrated driver, control logic and current control (chopper)
• Fast free-wheeling diodes
• Max. supply voltage 52 V
• Outputs free of crossover current
• Offset-phase turn-ON of output stages
• Z-diode for logic supply
• Low standby-current drain
• Full, half, quarter, mini step

Description

TCA 3727 is a bipolar, monoli thic IC for driving bipolar stepper motors, DC motors and other inductive loads that operate on constant current. The control logic and power output stages for two bipolar windings are integrated on a single chip which permits switched current control of motors with 0.75 A per phase at operating voltages up to 50 V. The direction and value of current are programmed for each phase via separate control inputs. A common oscillator generates the timing for the current control and turn-on with phase offset of the two output stages. The two output stages in a full-bridge configuration have integrated, fast free-wheeling diodes and are free of crossover current. The logic is supplied either separately with 5 V or taken from the motor supply voltage by way of a series resistor and an integrated Z-diode. The device can be dr iven directly by a microprocessor with the possibility of all modes from full step through half step to mini step.

Data Sheet 2 Rev. 2.0, 2004-10-01 Figure 1 Pin Configuration TCA 3727 (top view) IEP00696 Phase 2 Inhibit GND GND Q21Q11 GND GND OSC 10 11 Q22 9 12 8 13 7 14 6 15 5 16 4 17 3 18 2 19 1 20 12 RR VS Q12 VL Ι Phase 1 Ι Ι Ι

Data Sheet 3 Rev. 2.0, 2004-10-01 TCA 3727 Figure 2 Pin Configuration TCA 3727 G (top view) Table 1 Pin Definitions and Functions Pin No. Function 1, 2, 19, 20 (1, 2, 23, 24)1) Digital control inputs IX0, IX1 for the magnitude of the current of the particular phase. See Table 2. 3 Input Phase 1; controls the current through phase winding 1. On H-potential the phase current flows from Q11 to Q12, on L-potential in the reverse direction. 5, 6, 15, 16 (5, 6, 7, 8, 17, 18, 19, 20)1) Ground; all pins are connected internally. 4 Oscillator; works at approx. 25 kHz if this pin is wired to ground across 2.2 nF. 8 (10)1) Resistor R1 for sensing the current in phase 1. 7, 10 (9, 12)1) Push-pull outputs Q11, Q12 for phase 1 with integrated free- wheeling diodes. Q12 Q22 Q21 GND GND OSC Phase 1 Phase 2 Ι R IEP00898 Ι GND Q11 VS++ LV Inhibit Ι 20Ι GND 241 232 223 214 205 196 187 178 169 1510 1411 1312 GND GNDGND GND

Data Sheet 4 Rev. 2.0, 2004-10-01 9 (11)1) Supply voltage; block to ground, as close as possible to the IC, with a stable electrolytic capacitor of at least 10 µF in parallel with a ceramic capacitor of 220 nF. 12 (14)1) Logic supply voltage; either supply with 5 V or connect to +VS across a series resistor. A Z-diode of approx. 7 V is integrated. In both cases block to ground directly on the IC with a stable electrolytic capacitor of 10 µF in parallel with a ceramic capacitor of 100 nF. 11, 14 (13, 16)1) Push-pull outputs Q22, Q21 for phase 2 with integrated free wheeling diodes. 13 (15)1) Resistor R2 for sensing the current in phase 2. 17 (21)1) Inhibit input; the IC can be put on standby by low potential on this pin. This reduces the current consumption substantially. 18 (22)1) Input phase 2; controls the current flow through phase winding 2. On H-potential the phase current flows from Q21 to Q22, on L potential in the reverse direction. 1) TCA 3727 G only Table 2 Digital Control Inputs IX0, IX1 typical Imax with Rsense = 1 Ω, 750 mA IX1 IX0 Phase Current Example of Motor Status H H 0 No current H L 1/3 Imax Hold L H 2/3 Imax Set LL Imax Accelerate Table 1 Pin Definitions and Functions (cont’d) Pin No. Function

Data Sheet 5 Rev. 2.0, 2004-10-01 TCA 3727 Figure 3 Block Diagram TCA 3727 IEB00697 12 9 Q11 Q12 OSC Function Logic + V LS V+ Ι GND Phase 1 Phase 1 Phase 1 5, 6, 15, 16 Phase 2 Phase 2 Phase 2 Logic Function Inhibit Q22 Q21 Inhibit 11Ι 20Ι 21Ι

Data Sheet 6 Rev. 2.0, 2004-10-01 Figure 4 Block Diagram TCA 3727 G IEB00899 D14D13 D12D11 T14 T12 T13 T11 14 11 Q11 Q12 Oscillator Functional Logic LS V+ Ι GND Phase 1 Phase 1 Phase 1 5-8, 17-19 Phase 2 Phase 2 Phase 2 Logic Functional Inhibit Q22 Q21 16T21 T23 T22 T24 D21 D22 D23 D24 Inhibit Ι Ι20 Ι21

Data Sheet 7 Rev. 2.0, 2004-10-01 TCA 3727 Attention: Stresses above those listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 3 Absolute Maximum Ratings TA = -40 to 125 °C Parameter Symbol Limit Values Unit Remarks Min. Max. Supply voltage VS 05 2 V – Logic supply voltage VL 06 . 5 V Z - d i o d e Z-current of VL IL –5 0 m A – Output current IQ -1 1 A – Ground current IGND -2 2 A – Logic inputs VIXX -6 VL + 0.3 V IXX; Phase 1, 2; Inhibit R1, R2, oscillator input voltage VRX, VOSC -0.3 VL + 0.3 V – Junction temperature Tj – 125 150 max. 10,000 h Storage temperature Tstg -50 125 °C–

Data Sheet 8 Rev. 2.0, 2004-10-01 Note: In the operating range, the functions given in the circuit description are fulfilled. Table 4 Operating Range Parameter Symbol Limit Values Unit Remarks Min. Max. Supply voltage VS 55 0 V – Logic supply voltage VL 4.5 6.5 V without series resistor Case temperature TC -40 110 °C measured on pin 5 Pdiss = 2 W Output current IQ -1000 1000 mA – Logic inputs VIXX -5 VL V IXX; Phase 1, 2; Inhibit Thermal Resistances Junction ambient Rth ja – 56 K/W P-DIP-20-6 Junction ambient (soldered on a 35 µm thick 20 cm2 PC board copper area) Rth ja – 40 K/W P-DIP-20-6 Junction case Rth jc – 18 K/W measured on pin 5 P-DIP-20-6 Junction ambient Rth ja –7 5 K / W P - D S O - 2 4 - 3 Junction ambient (soldered on a 35 µm thick 20 cm2 PC board copper area) Rth ja –5 0 K / W P - D S O - 2 4 - 3 Junction case Rth jc – 15 K/W measured on pin 5 P-DSO-24-3

Data Sheet 9 Rev. 2.0, 2004-10-01 TCA 3727 Table 5 Characteristics VS = 40 V; VL = 5 V; -25 °C ≤ Tj ≤ 125 °C Parameter Symbol Limit Valu es Unit Test Condition Min. Typ. Max. Current Consumption from +VS IS –0 . 2 0 . 5 m A Vinh = L from +VS IS –1 6 2 0 m A Vinh = H IQ1/2 = 0, IXX = L from +VL IL –1 . 7 3m A Vinh = L from +VL IL –1 8 2 5 m A Vinh = H IQ1/2 = 0, IXX = L Oscillator Output charging current IOSC – 110 – µA– Charging threshold VOSCL –1 . 3 –V – Discharging threshold VOSCH –2 . 3 –V – Frequency fOSC 18 25 35 kHz COSC = 2.2 nF Phase Current Selection (R1; R2) Current Limit Threshold No current Vsense n – 0 – mV IX0 = H; IX1 = H Hold Vsense h 200 250 300 mV IX0 = L; IX1 = H Setpoint Vsense s 460 540 620 mV IX0 = H; IX1 = L Accelerate Vsense a 740 825 910 mV IX0 = L; IX1 = L Logic Inputs (IX1; IX0; Phase x) Threshold VI 1.4 (H→L) –2 . 3 (L→H) L-input current IIL -10 – – µA VI = 1.4 V L-input current IIL -100 – – µA VI = 0 V H-input current IIH –– 1 0 µA VI = 5 V Standby Cutout (inhibit) Threshold VInh (L→H) 23 4V – Threshold VInh (H→L) 1.7 2.3 2.9 V – Hysteresis VInhhy 0.3 0.7 1.1 V –

Data Sheet 10 Rev. 2.0, 2004-10-01 Note: The listed characteristic s are ensured over the operat ing range of the integrated circuit. Typical characteristics specify mean values expected over the production spread. If not otherwise specified, typical characteristics apply at TA = 25 °C and the given supply voltage. Internal Z-Diode Z-voltage VLZ 6.5 7.4 8.2 V IL = 50 mA Power Outputs Diode Transistor Sink Pair (D13, T13; D14, T14; D23, T23; D24, T24) Saturation voltage Vsatl –0 . 3 0 . 6 V IQ = -0.5 A Saturation voltage Vsatl –0 . 5 1V IQ = -0.75 A Reverse current IRl – – 300 µA VQ = 40 V Forward voltage VFl –0 . 9 1 . 3 V IQ = 0.5 A Forward voltage VFl –1 1 . 4 V IQ = 0.75 A Diode Transistor Source Pair (D11, T11; D12, T12; D21, T21; D22, T22) Saturation voltage VsatuC –0 . 9 1 . 2 V IQ = 0.5 A; charge Saturation voltage VsatuD –0 . 3 0 . 7 V IQ = 0.5 A; discharge Saturation voltage VsatuC –1 . 1 1 . 4 V IQ = 0.75 A; charge Saturation voltage VsatuD –0 . 5 1V IQ = 0.75 A; discharge Reverse current IRu – – 300 µA VQ = 0 V Forward voltage VFu –1 1 . 3 V IQ = -0.5 A Forward voltage VFu –1 . 1 1 . 4 V IQ = -0.75 A Diode leakage current ISL –1 2m A IF = -0.75 A Table 5 Characteristics (cont’d) VS = 40 V; VL = 5 V; -25 °C ≤ Tj ≤ 125 °C Parameter Symbol Limit Valu es Unit Test Condition Min. Typ. Max.

Data Sheet 11 Rev. 2.0, 2004-10-01 TCA 3727 Quiescent Current IS, IL versus Supply Voltage VS Output Current IQX versus Junction Temperature Tj Quiescent Current IS, IL versus Junction Temperature Tj Operating Condition:

• VL = 5 V
• VInh = H
• COSC = 2.2 nF
• Rsense = 1 Ω
• Load: L = 10 mH, R = 2.4 Ω
• fphase = 50 Hz
• mode: fullstep 01 0 2 0 3 0V 5 0 mA Ι XX = H = LXXΙ jT = 25 C SΙ LΙ LΙ IED01655 VS Ι S , LΙ -25 0 25 50 75 100 C 150 jT QXΙ IED01657 200 800 400 600 mA -25 0 25 50 75 100 150 C IED01656 XXΙ = H = LΙ XX = 40V LΙ LΙ Ι S jT ΙΙ S , L mA VS

Data Sheet 12 Rev. 2.0, 2004-10-01 TCA 3727 Output Saturation Voltages Vsat versus Output Current IQ Typical Power Dissipation Ptot versus Output Current IQ (non stepping) Forward Current IF of Free-Wheeling Diodes versus Forward Voltages VF Permissible Power Dissipation Ptot versus Case Temperature TC 0.5 0.2 0.4 0.6 1.0 V 1.5 V F Ι F 0.8 A T j 1.0 = 25 C FlVV Fu IED01167 P-DSO-24 P-DIP-20 Measured at pin 5. IED01660 W totP 100-25 0 50 25 75 C 175 T c 125

Data Sheet 13 Rev. 2.0, 2004-10-01 TCA 3727 Input Characteristics of IXX, Phase X, Inhibit Oscillator Frequency fOSC versus Junction Temperature Tj Input Current of Inhibit versus Junction Temperature Tj V L = 5V -6 -5 -2 3.9 2 6 IED01661 0.8 0.4 0.4 mA IXXΙ 0.8 V VIXX 0.2 0.6 0.6 0.2 kHz -25 0 25 50 75 100 125 C 150 V S LV OSZC = 40V = 5V = 2.2nF OSCf jT IED01663

Data Sheet 14 Rev. 2.0, 2004-10-01 Figure 5 Test Circuit IES00706 12 9 41 3 8 GNDOSC 5, 6 15, 16 R R 2 Ω12.2 nF Phase 1 Phase 2 Inhibit VL VS Q11 Q12 Q21 Q22 TCA 3727 220 nF 100 F µ220 nF100 Fµ Ι L Ι S Ι GND Ι OSC VOSC Ι Q Ι Fu Ι R Ι Ru Satl VSatu VFu VS VΙ VΙ Ι Ι Ι Ι L H L H Ι Ι Ι Ι VFl- SenseV V VSense

Data Sheet 15 Rev. 2.0, 2004-10-01 TCA 3727 Figure 6 Application Circuit IES00707 12 3 41 3 8 GNDOSC 5, 6 15, 16R R 2 Ω12.2 nF Micro Controller Ι Phase 1 Phase 2 Inhibit VL VS Q11 Q12 Q21 Q22 TCA 3727 M 220 nF 100 F µ +40 V+5 V 220 nF100 Fµ Ι Ι Ι

Data Sheet 16 Rev. 2.0, 2004-10-01 Figure 7 Full-Step Operation t IED01666 Accelerate Mode Normal Mode acc set L H L H L H Ι Phase 1 i i Ι Ι10 seti i acc i set i acc i Q2Ι acc seti Ι21 20Ι H H L L L H Phase 2 t t t t t t t

Data Sheet 17 Rev. 2.0, 2004-10-01 TCA 3727 Figure 8 Half-Step Operation t t t t t t IED01667 t Accelerate Mode Normal Mode t 21Ι Phase 2 Ι L L H H H L Q2Ι i set acci i set acc i acci Q1Ι Phase 1 seti seti L acci H Ι11 Ι H H L L

Data Sheet 18 Rev. 2.0, 2004-10-01 Figure 9 Quarter-Step Operation

Data Sheet 19 Rev. 2.0, 2004-10-01 TCA 3727 Figure 10 Mini-Step Operation H L H L H L i set i hold Ι10 Ι11 Phase 1 Ι Q1 t IED01665 acci seti i hold acci i acc set i set hold acc hold i i i i Ι Q2 L H H L L H Ι Ι20 Phase 2 t t t t t t t

Data Sheet 20 Rev. 2.0, 2004-10-01 Figure 11 Current Control OscV Ι GND V Q12 V S+ S+ V V+ S + V S t t V FU sat 1V satu DV satu CV phase x phase x Operating conditions: V R L S = 40 V = 10 mH = 20 IED01177 Ω 2.4 V 1.4 V t t V Q11 V Q22 V Q21 t t T V L = 5 V Inhibit xx V V V phase x = H = L = H

Data Sheet 21 Rev. 2.0, 2004-10-01 TCA 3727 Figure 12 Phase Reversal and Inhibit Inhibit Oscillator High Imped. Oscillator High Imped. Phase 1 Phase Changeover High Impedance High Impedance High Impe- dance Slow Current Decay Fast Current Decay IED01178 Ι GND V Osc 2.3 V 1.3 V L L Ι N t V Q11 satlV FuV Vsatu C satu DV FlV SV+ Phase 1Ι Fast Current Decay by InhibitSlow Current Decay Operating Conditions: V S = 40 V V = 5 VΙ phase 1L phase 1R Ι 1X = 20 = L; V+ S Q12V = 10 mH Ω 1XΙ = H t t t t t t

Data Sheet 22 Rev. 2.0, 2004-10-01 Calculation of Power Dissipation The total power dissipation Ptot is made up of

• saturation losses Psat (transistor saturation voltage and diode forward voltages),
• quiescent losses Pq (quiescent current times supply voltage) and
• switching losses Ps (turn-ON / turn-OFF operations). The following equations give the power dissipation for chopper operation without phase reversal. This is the worst case, because fu ll current flows for the entire time and switching losses occur in addition. Ptot = 2 × Psat + Pq + 2 × Ps (1) where
• Psat ≅ IN {Vsatl × d + VFu (1 - d) + VsatuC × d + VsatuD (1 - d)}
• Pq = Iq × VS + IL × VL (2)
• IN = nominal current (mean value)
• Iq = quiescent current
• iD = reverse current during turn-on delay
• iR = peak reverse current
• tp = conducting time of chopper transistor
• tON = turn-ON time
• tOFF = turn-OFF time
• tDON = turn-ON delay
• tDOFF = turn-OFF delay
• T = cycle duration
• d = duty cycle tp/T
• Vsatl = saturation voltage of sink transistor (T3, T4)
• VsatuC = saturation voltage of source transistor (T1, T2) during charge cycle
• VsatuD = saturation voltage of source transistor (T1, T2) during discharge cycle
• VFu = forward voltage of free-wheeling diode (D1, D2)
• VS = supply voltage
• VL = logic supply voltage
• IL = current from logic supply PS VS 2-----tDOFF tOFF+++ ⎧⎫≅

Data Sheet 24 Rev. 2.0, 2004-10-01 Application Hints The TCA 3727 is intended to drive both pha ses of a stepper moto r. Special care has been taken to provide high efficiency, robustness and to minimize external components. Power Supply The TCA 3727 will work with supply voltages ranging from 5 V to 50 V at pin VS. As the circuit operates with chopper regulation of the current, interference generation problems can arise in some applicatio ns. Therefore the po wer supply should be decoupled by a 0.22 µF ceramic capacitor locate d near the package. Unstabil ized supplies may even afford higher capacities. Current Sensing The current in the windings of the stepper motor is sensed by the voltage drop across R1 and R2. Depending on the selected current internal comparators will turn off the sink transistor as soon as the volt age drop reaches certain thresholds (typical 0 V, 0.25 V, 0.5 V and 0.75 V); (R1, R2 = 1 Ω). These thresholds are neither affected by variations of VL nor by variations of VS. Due to chopper control fast current rises (up to 10 A/ µs) will occur at the sensing resistors R1 and R2. To prevent malfunction of the current sensing mechanism R1 and R2 should be pure ohmic. The resi stors should be wired to GND as directly as possible. Capacitive loads such as long cables (with high wire to wire capacity) to the motor should be avoided for the same reason. Synchronizing Several Choppers In some applications synchro nous chopping of several step per motor drivers may be desirable to reduce acoustic interference. This can be done by forcing the oscillator of the TCA 3727 by a pulse generator overdr iving the oscillator loading currents (approximately ≥ ±100 µA). In these applications low level should be between 0 V and 1 V while high level should be between 2.6 V and VL. Optimizing Noise Immunity Unused inputs should always be wired to proper voltage levels in order to obtain highest possible noise immunity. To prevent crossconduction of the output stages the TCA 3727 uses a special break before make timing of the power transistors. This timing circuit can be triggered by short glitches (some hundred nanoseconds) at the Phase inputs causing the output stage to become high resistive during some microseconds. This will lead to a fast current decay during that time. To achieve maximum current accuracy su ch glitches at the Phase inputs should be avoided by proper control signals.

Data Sheet 25 Rev. 2.0, 2004-10-01 TCA 3727 Thermal Shut Down To protect the circuit against thermal des truction, thermal sh ut down has been implemented. To provide a warning in critic al applications, the current of the sensing element is wired to input Inhibit. Before thermal shut down occurs Inhibit will start to pull down by some hundred microamperes. Th is current can be sensed to build a temperature prealarm.

Data Sheet 26 Rev. 2.0, 2004-10-01 Package Outlines Figure 15 P-DIP-20-6 (Plastic Dual In-line Package) GPD05587 You can find all of our packages, sorts of packing and others in our Infineon Internet Page “Products”: http://www.infineon.com/products. Dimensions in mm

Data Sheet 27 Rev. 2.0, 2004-10-01 TCA 3727 Figure 16 P-DSO-24-3 (Plastic Dual Small Outline Package) Lead width can be 0.61 max. in dambar area Does not include plastic or metal protrusion of 0.15 max. per side Index Marking 1.27 +0.150.35 15.6 -0.4 1) 12 0.2 24x 0.1 2.65 MAX. 0.2 -0.1 2.45 -0.2 0.4 +0.8 10.3 ±0.3 0.35 x 45˚ -0.27.6 1) 0.23 +0.09 MAX.8˚ GPS05144 You can find all of our packages, sorts of packing and others in our Infineon Internet Page “Products”: http://www.infineon.com/products. Dimensions in mm

Template: ap_a5_vr_tmplt.fm / 2 / 2004-09-15 TCA 3727 Revision History: 2004-10-01 Rev. 2.0 Previous Version: 1.0, 1998-12-16 Page Subjects (major changes since last revision)

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