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PBL3771QN Ericsson Precision Stepper Motor Driver

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PBL3771QN Ericsson Precision Stepper Motor Driver, switch-mode, constant-current driver IC (chopper) with two channels, one for each winding of a two-phase stepper motor.

PBL3771QN Ericsson Precision Stepper Motor Driver

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Jrc - Eric Pbl3771Qn Njm3771Fm2 P/N Njm3771Fm2 IC Precision Stepper Motor Driver

Precision Stepper Motor Driver Description The PBL 3771/1 is a switch-mode, constant-current driver IC (chopper) with two channels, one for each winding of a two-phase stepper motor. The circuit is especially developed for use in microstepping applications in conjunction with the matching dual DAC (Digital-to-Analog Converter) PBM 3960. A complete driver system consists of these two ICs, a few passive components and a microprocessor for generation of the proper control and data codes required for microstepping. The PBL 3771/1 contains a clock oscillator, which is common for both driver channels; a set of comparators and flip-flops implementing the switching control; and two H-bridges with internal recirculation diodes. Voltage supply requirements are +5 V for logic and +10 to +45 V for the motor. Maximum output current is 650 mA per channel. A special logic function is used to select slow or fast current decay in the output stage for improved high-speed microstepping. The close match between the two driver channels guarantees consistent output current ratios and motor positioning accuracy. Key Features • Dual chopper driver in a single package. • 650 mA output current per channel. • Close matching between channels for high microstepping accuracy. • Selectable slow/fast current decay for improved high-speed microstepping. • Improved low-level linearity. • Specially matched to Dual DAC PBM 3960. • Selection of packages, 22-pin “batwing” DIP, 24 pin "batwing" SOIC or 28-lead PLCC with lead-frame for heat-sinking through PC board copper. V CC V – + CC R S Q M A1 + – Logic M B1 P PBL 3771/1 V MM1 + – V MM2 M B2 – + + – Phase 2 CD2 V R2 C2 GND E2 28-pin PLCC package 22-pin plastic DIP package 24-pin SO package Figure 1. Block diagram. 1 PB L S R Q 37 RC 71 /1 Logic M A2 B L L B 1 P 71/ 37 37 Phase 1 CD 1 V R1 C1 E1 71 /1 PBL 3771/1 Maximum Ratings Parameter Pin no. (DIL) Symbol Min Max Unit Voltage Logic supply Motor supply Logic inputs Comparator inputs Reference inputs Current Motor output current Logic inputs Analog inputs Oscillator charging current Temperature Operating junction temperature Storage temperature** ** Circuit only. The packaging can handle max 60°C 11 3, 20 7, 8, 15, 16 10, 13 9, 14 1, 4, 19, 22 7, 8, 15, 16 10, 13 12 VCC VMM VI VC VR IM II IA IRC TJ TS 0 0 -0.3 -0.3 -0.3 -700 -10 -10 7 45 6 VCC 7.5 +700 V V V V V mA mA mA mA °C °C 5 -40 -55 +150 +150 Recommended Operating Conditions Parameter Symbol Min Typ Max Unit Logic supply voltage Motor supply voltage Motor output current *** Junction temperature **** Rise time logic inputs Fall time logic inputs Oscillator timing resistor VCC VMM IM TJ tr tf RT 4.75 10 -650 -20 5 2 15 5.25 40 650 +125 2 2 20 V V mA °C µs µs kohms *** In microstepping mode, “sine/cosine” drive where I1 = 650 • cos(θ) and I2 = 650 • sin(θ) mA, otherwise 500 mA/channel both channels fully on. ****See operating temperature chapter. Phase 1 7 CD 1 V R1 8 9 C1 10 E1 2 Pin numbers refer to DIL-package PBL 3771/1 I CC VCC V 11 – + CC | V MA – V MB | R S Q 4 + – M A1 M B1 V MM1 V MM2 M B2 M A2 IM I OL I MM Logic 1 t on 50 % t off 3 15 kW + RT – 20 – + 22 Logic S R Q 19 t VE V CH I RC RC 12 + – td 3 300 pF VCC CT Phase 2 II I IH I IL IA VI VIH VIL VA VR VCH VC 820 pF 16 15 14 13 C2 IC IA 5, 6, 17, 18 GND 21 E2 CD2 V R2 1 kW RC VE VM VMA V MM t CC RS fs = t + t on off 1 ton D= ton + t off Figure 2. Definitions of symbols. 2 Figure 3. Definition of terms. PBL 3771/1 Electrical Characteristics Electrical characteristics over recommended operating conditions, unless otherwise noted. -20°C - TJ - +125°C. Parameter Ref. Symbol fig. Conditions Min Typ Max Unit General Supply current Total power dissipation ICC PD Turn-off delay Logic Inputs Logic HIGH input voltage Logic LOW input voltage Logic HIGH input current Logic LOW input current Reference Inputs Input resistance Input current Turn-off voltage Comparator Inputs Threshold voltage | VCH1 - VCH2 | mismatch Input current td 3 VMM = 40 V, IM1= 450 mA, IM2= 0 mA. Notes 2, 3. VMM = 40 V, IM1 = IM2 = 318 mA. Notes 2, 3. Ta = +25°C, dVC/dt ≥ 50 mV/µs. Note 3. 2.0 VI = 2.4 V VI = 0.4 V Ta = +25°C Ta = +25°C, VR = 2.5 V. 20 RC = 1 kohms, VR = 2.5 V RC = 1 kohms 430 -10 IM = 500 mA VMM = 41 V, VE = VR = 0 V, VC = VCC IM = 500 mA IM = 500 mA VMM = 41 V, VE = VR = 0 V, VC = VCC IM = 500 mA 38 1.4 1.6 1.0 50 1.6 1.8 1.5 mA W W µs VIH VIL IIH IIL RR IR VTO VCH VCH,diff IC 0.8 20 -0.4 5 0.5 29 450 1 V V µA mA kohms mA mV mV mV µA V µA V V µA V kHz 1.0 38 470 1 Motor Outputs Lower transistor saturation voltage Lower transistor leakage current Lower diode forward voltage drop Upper transistor saturation voltage Upper transistor leakage current Upper diode forward voltage drop Chopper Oscillator Chopping frequency fs 3 1.00 1.10 1.20 1.00 25.0 26.5 1.20 300 1.25 1.35 300 1.25 28.0 CT = 3300 pF, RT = 15 kohms Thermal Characteristics Parameter Ref. Symbol fig. Conditions Min Typ Max Unit Thermal resistance RthJ-BW RthJ-A RthJ-BW RthJ-A RthJ-BW RthJ-A 13 13 13 13 13 13 DIL package. DIL package. Note 2. PLCC package. PLCC package. Note 2. SO package. SO package. Note 2. 11 40 9 35 13 42 °C/W °C/W °C/W °C/W °C/W °C/W Notes 1. All voltages are with respect to ground. Currents are positive into, negative out of specified terminal. 2. 3. 4. All ground pins soldered onto a 20 cm2 PCB copper area with free air convection. Not covered by final test program. Switching duty cycle D = 30%, fS = 26.5 kHz. 3 PBL 3771/1 MB1 1 NC 1 MB1 2 E1 3 VMM1 4 MA1 5 GND 6 GND 7 Phase1 8 CD1 9 VR1 10 C1 11 Vcc 12 24 NC 23 MB2 22 E2 21 VMM2 22 21 20 19 18 MB2 3 GND 2 GND 1 GND 28 GND 26 CD 2 4 MA2 E1 2 V MM1 3 MA1 4 GND 5 GND 6 Phase 1 7 CD1 8 VR1 9 C 1 10 VCC 11 E2 V MM2 MA2 GND GND Phase 2 CD2 VR2 V MM2 5 E2 6 M B2 7 M B1 8 GND 9 E1 10 VMM1 11 27 Phase 2 25 V R2 24 C 2 23 RC PBL 3771/1 SO 20 MA2 19 GND 18 GND PBL 3771/1N 17 16 15 14 13 12 PBL 3771/1QN 22 VCC 21 C 1 20 V R1 19 CD1 17 Phase2 16 CD2 15 VR2 14 C2 13 RC MA1 12 GND 13 GND 14 GND 15 GND 16 GND 17 C2 RC Figure 4. Pin configuration. Pin Description Refer to figure 4. SO DIP PLCC Symbol Description 2 3 4 5 6,7, 18,19 8 9 10 11 1 2 3 4 5,6, 17,18 7 8 9 10 8 10 11 12 1-3,9, 13-17,28 18 19 20 21 MB1 E1 VMM1 MA1 GND Phase1 CD1 VR1 C1 12 13 14 11 12 13 22 23 24 VCC RC C2 Motor output B, channel 1. Motor current flows from MA1 to MB1 when Phase1 is HIGH. Common emitter, channel 1. This pin connects to a sensing resistor to ground. Motor supply voltage, channel 1, 10 to 40 V. VMM1 and VMM2 should be connected together. Motor output A, channel 1. Motor current flows from MA1 to MB1 when Phase1 is HIGH. Ground and negative supply. Note: these pins are used thermally for heat-sinking. Make sure that all ground pins are soldered onto a suitably large copper ground plane for efficient heat sinking. Controls the direction of motor current at outputs MA1 and MB1. Motor current flows from MA1 to MB1 when Phase1 is HIGH. Current decay control, channel 1. A logic HIGH on this input results in slow current decay, a LOW results in fast current decay, see “Functional Description.” Reference voltage, channel 1. Controls the threshold voltage for the comparator and hence the output current. Input resistance is typically 2.5 kohms, ±20%. Comparator input channel 1. This input senses the instantaneous voltage across the sensing resistor, filtered by an RC network. The threshold voltage for the comparator is (0.450 / 2.5) • VR1, i.e. 450 mV at VR1 = 2.5 V. Logic voltage supply, nominally +5 V. Clock oscillator RC pin. Connect a 15 kohm resistor to VCC and a 3300 pF capacitor to ground to obtain the nominal switching frequency of 26.5 kHz. Comparator input channel 2. This input senses the instantaneous voltage across the sensing resistor, filtered by an RC network. The threshold voltage for the comparator is (0.450 / 2.5) • VR1, i.e. 450 mV at VR1 = 2.5 V. Reference voltage, channel 2. Controls the threshold voltage for the comparator and hence the output current. Input resistance is typically 2.5 kohms, ±20%. Current decay control, channel 2. A logic HIGH on this input results in slow current decay, a LOW results in fast current decay, see “Functional Description.” Controls the direction of motor current at outputs MA2 and MB2. Motor current flows from MA2 to MB2 when Phase2 is HIGH. Motor output A, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH. Motor supply voltage, channel 2, 10 to 40 V. VMM1 and VMM2 should be connected together. Common emitter, channel 2. This pin connects to a sensing resistor to ground. Motor output B, channel 2. Motor current flows from MA2 to MB2 when Phase2 is HIGH. 15 16 17 20 21 22 23 14 15 16 19 20 21 22 25 26 27 4 5 6 7 VR2 CD2 Phase2 MA2 VMM2 E2 MB2 4 Phase1 18 PBL 3771/1 Functional Description Each channel of the PBL 3771/1 consists of the following sections: an H-bridge output stage, capable of driving up to 650 mA continuous motor current (or 500 mA, both channels driven), a logic section that controls the output transistors, an S-R flip-flop, and two comparators. The oscillator is common to both channels. Constant current control is achieved by switching the current to the windings. This is done by sensing the (peak) voltage across a current-sensing resistor, RS, effectively connected in series with the motor winding, and feeding that voltage back to a comparator. When the motor current reaches a threshold level, determined by the voltage at the reference input, VR, the comparator resets the flip-flop, which turns off the output transistors. The current decreases until the clock oscillator triggers the flip-flop, which turns on the output transistors again, and the cycle is repeated.

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PBL3771QN
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