INTEGRATED CIRCUITS DATA SHEET TDF5242T Brushless DC motor drive circuit Preliminary specification Supersedes data of 1997 Apr 23 File under Integrated Circuits, IC11 1997 Sep 12 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T FEATURES APPLICATIONS • Full-wave commutation without position sensors • High-power applications, for instance: • Built-in start-up circuitry – high-end hard disk drives • Six outputs that can drive three external transistor pairs: – automotive applications. – output current 0.2 A (typ.) – low saturation voltage GENERAL DESCRIPTION – built-in current limiter The TDF5242T is a bipolar integrated circuit for driving 3-phase brushless DC motors in full-wave mode. The device functions sensorless, thus saving 3 hall-effect sensors, using the back-EMF (Electro Motive Force) sensing technique to sense the rotor position. It includes 6 pre-drivers able to control external FETs (Field Effect Transistors) or bipolar transistors. It offers brake and direction control. It is ideally suited for high-power applications such as high-end hard disk drives and automotive applications. • Thermal protection • Tacho output without extra sensor • Transconductance amplifier for an external control transistor • Brake control input • Direction control input. QUICK REFERENCE DATA Measured over full voltage and temperature range. SYMBOL PARAMETER VP supply voltage VVMOT input voltage to the output driver stages VO driver output voltage ILIM current limiting CONDITIONS note 1 MIN. TYP. MAX. UNIT 4 − 18 V 3 − 18 V IO = 100 mA; lower transistor − − 0.35 V IO = 100 mA; upper transistor 1.05 − − V VVMOT = 14.5 V; RO = 47 Ω 150 200 250 mA Note 1. An unstabilized supply can be used. ORDERING INFORMATION TYPE NUMBER TDF5242T 1997 Sep 12 PACKAGE NUMBER SO28 DESCRIPTION plastic small outline package; 28 leads; body width 7.5 mm 2 VERSION SOT136-1 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T BLOCK DIAGRAM AMP OUT handbook, full pagewidth VMOT 21 +AMP IN 19 −AMP IN 20 6 OUTPUT DRIVER STAGE TRANSCONDUCTANCE AMPLIFIER 27 CAP-ST CAP-DC CAP-CD TEST CAP-TI FG 16 START-UP OSCILLATOR 15 ADAPTIVE COMMUTATION DELAY 14 8 THERMAL PROTECTION TIMING OUTPUT DRIVER STAGE 28 OUTPUT DRIVER STAGE 1 OUTPUT DRIVER STAGE 2 OUTPUT DRIVER STAGE 4 OUTPUT DRIVER STAGE 5 OUT-NA OUT-PA OUT-NB COMMUTATION LOGIC 18 ROTATION SPEED AND DETECTOR OUTPUT STAGE 10 OUT-PB OUT-PC DIRECTION LOGIC BRAKE LOGIC 22 OUT-NC COMP-A TDF5242T 23 n.c. 24 26 12, 17, 25 EMF COMPARATORS 7 9 11 3 13 MGG988 DIR BRAKE GND2 GND1 Fig.1 Block diagram. 1997 Sep 12 3 VP COMP-B COMP-C MOT0 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T PINNING SYMBOL PIN driver output B for driving the n-channel power FET or power NPN COMP-B 23 comparator input corresponding to output B 2 driver output B for driving the p-channel power FET or power PNP COMP-C 24 comparator input corresponding to output C GND1 3 ground (0 V) motor supply return for output stages n.c. 25 not connected MOT0 26 OUT-PC 4 driver output C for driving the p-channel power FET or power PNP input from the star point of the motor coils OUT-NA 27 OUT-NC 5 driver output C for driving the n-channel power FET or power NPN driver output A for driving the n-channel power FET or power NPN OUT-PA 28 VMOT 6 input voltage for the output driver stages driver output A for driving the p-channel power FET or power PNP DIR 7 direction input command TEST 8 test input/output BRAKE 9 brake input FG 10 frequency generator: output of the rotation speed detector stage SYMBOL PIN DESCRIPTION OUT-NB 1 OUT-PB GND2 11 ground supply return for control circuits n.c. 12 not connected VP 13 supply voltage CAP-CD 14 external capacitor connection for adaptive communication delay timing CAP-DC 15 16 external capacitor connection for start-up oscillator n.c. 17 not connected CAP-TI 18 external capacitor connection for timing +AMP IN 19 non-inverting input of the transconductance amplifier −AMP IN 20 inverting input of the transconductance amplifier AMP OUT 21 transconductance amplifier output (open collector) COMP-A 22 comparator input corresponding to output A 1997 Sep 12 handbook, halfpage OUT-NB 1 28 OUT-PA OUT-PB 2 27 OUT-NA GND1 3 26 MOT0 OUT-PC 4 25 n.c. OUT-NC 5 24 COMP-C VMOT 6 23 COMP-B DIR 7 22 COMP-A TDA5242T external capacitor connection for adaptive communication delay timing copy CAP-ST DESCRIPTION TEST 8 21 AMP OUT BRAKE 9 20 −AMP IN FG 10 19 +AMP IN GND2 11 18 CAP-TI n.c. 12 17 n.c. VP 13 16 CAP-ST CAP-CD 14 15 CAP-DC MGG987 Fig.2 Pin configuration. 4 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T The system will only function when the EMF voltage from the motor is present. Therefore, a start oscillator is provided that will generate commutation pulses when no zero-crossings in the motor voltage are available. FUNCTIONAL DESCRIPTION Introduction Full-wave driving of a three phase motor requires three push-pull output stages. In each of the six possible states two outputs are active, one sourcing (H) and one sinking (L). The third output presents a high impedance (Z) to the motor, which enables measurement of the motor back-EMF (Electro Motive Force) in the corresponding motor coil by the EMF comparator at each output. The commutation logic is responsible for control of the output transistors and selection of the correct EMF comparator. In Table 1, the six possible states of the externally connected output transistors have been depicted and the corresponding output levels on the NA, PA, NB, PB, NC and PC outputs of the TDF5242T. A timing function is incorporated into the device for internal timing and for timing of the reverse rotation detection. The TDF5242T also contains an uncommitted transconductance amplifier (OTA) that can be used as a control amplifier. The output is capable of directly driving an external power transistor. The TDF5242T is designed for systems with low current consumption. It uses I2L logic and adaptive base drive for the output transistors (patented). Start-up and commutation control The zero-crossing in the motor EMF (detected by the comparator selected by the commutation logic) is used to calculate the correct moment for the next commutation, that is, the change to the next output state. The delay is calculated (depending on the motor loading) by the adaptive commutation delay block. The system has been designed in such a way that the tolerances of the application components are not critical. However, the approximate values of the following components must still be determined: • The start capacitor; this determines the frequency of the start oscillator The output stages are protected by a current limiting circuit and by thermal protection. • The two capacitors in the adaptive commutation delay circuit; these are important in determining the optimum moment for commutation, depending on the type and loading of the motor The detected zero-crossings are used to provide speed information. The information has been made available on the FG output pin. This output provides an output signal with a frequency equal to the commutation frequency. Table 1 • The timing capacitor; this provides the system with its timing signals. Output states (note 1) DIR STATE MOT1 OUT-NA OUT-PA MOT2 OUT-NB OUT-PB MOT3 OUT-NC OUT-PC H 1 Z L H L H H H L L H 2 H L L L H H Z L H H 3 H L L Z L H L H H H 4 Z L H H L L L H H H 5 L H H H L L Z L H H 6 L H H Z L H H L L L 1 Z L H L H H H L L L 2 L H H Z L H H L L L 3 L H H H L L Z L H L 4 Z L H H L L L H H L 5 H L L Z L H L H H L 6 H L L L H H Z L H Note 1. H = HIGH state; L = LOW state; Z = high-impedance OFF-state. 1997 Sep 12 5 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T Example: J = 72 × 10−6 kg.m2, K = 25 × 10−3 Nm/A, p = 6 and I = 0.5 A; this gives fosc = 5 Hz. If the damping is high, a start frequency of 2 Hz can be chosen or t = 500 ms, thus, according to equation (1): C = 0.5/2.15 = 0.23 µF (choose 220 nF). START CAPACITOR (CAP-ST) This capacitor determines the frequency of the start oscillator. It is charged and discharged, with a current of 2 µA, from 0.05 to 2.2 V and back to 0.05 V. The time to complete one cycle is: t start = ( 2.15 × C ) s (with C in µF ) ADAPTIVE COMMUTATION DELAY (CAP-CD AND CAP-DC) (1) In this circuit the capacitor CAP-CD is charged during one commutation period, with an interruption of the charging current during the diode pulse. During the next commutation period the capacitor is discharged at twice the charging current. The charging current is 8.1 µA and the discharging current 16.2 µA; the voltage range is from 0.9 to 2.2 V. The voltage must stay within this range at the lowest commutation frequency of interest, fC1: The start oscillator is reset by a commutation pulse and is only active when the system is in the start-up mode. A pulse from the start oscillator will cause the outputs to change to the next state. If the movement of the motor generates enough EMF, the TDF5242T will run the motor. If the amount of EMF generated is insufficient, then the motor will move one step only and will oscillate in its new position. The amplitude of the oscillation must decrease sufficiently before the arrival of the next start pulse, to prevent the pulse arriving during the wrong phase of the oscillation. The start capacitor should be chosen to meet this requirement. –6 8.1 × 10 6231 C = -------------------------- = ------------- (C in nF) f × 1.3 f C1 If the commutation frequency is lower, a constant commutation delay after the zero-crossing is generated by the discharge from 2.2 down to 0.9 V at 16.2 µA; maximum delay = (0.076 × C) ms (with C in nF) The oscillation frequency of the motor is given by: 1 f osc = ----------------------------------Kt × I × p 2π ----------------------J where: Example: nominal commutation frequency = 900 Hz and the lowest usable frequency = 400 Hz; so: 6231 CAP-CD = ------------- = 15.6 (choose 18 nF) 400 Kt = torque constant (Nm/A) I = current (A) The other capacitor, CAP-DC, is used to repeat the same delay by charging and discharging with 15.5 µA. The same value can be chosen as for CAP-CD. Figure 3 illustrates typical voltage waveforms. p = number of magnetic pole-pairs J = inertia J (kg.m2). handbook, full pagewidth Vmax = VIH voltage on CAP-CD VIL COM(1) COM COM COM COM COM voltage on CAP-DC t ZCR(2) ZCR ZCR ZCR ZCR ZCR MGG993 (1) COM = commutation. (2) ZCR = zero-crossing. Fig.3 CAP-CD and CAP-DC typical voltage waveforms in normal running mode. 1997 Sep 12 6 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T To ensure a good start-up and commutation, care must be taken that no oscillations occur at the trailing edge of the flyback pulse. Snubber networks at the outputs should be critically damped. THE TIMING CAPACITOR (CAP-TI) Capacitor CAP-TI is used for timing the successive steps within one commutation period; these steps include some internal delays. Typical voltage waveforms are illustrated by Fig.4. The most important function is the watchdog time in which the motor EMF has to recover from a negative diode-pulse back to a positive EMF voltage (or vice versa). A watchdog timer is a guarding function that only becomes active when the expected event does not occur within a predetermined time. Miscellaneous functions In addition to start-up and commutation control, the TDF5242T provides the following functions: • Generation of the tacho signal FG The EMF usually recovers within a short time if the motor is running normally (<<1 ms). However, if the motor is motionless or rotating in the reverse direction, the time can be longer (>>1 ms). • General purpose Operational Transconductance Amplifier (OTA) A watchdog time must be chosen such that it is long enough for a motor without detectable EMF, however, it must be short enough to detect reverse rotation. If the watchdog time is made too long, then the motor may run in the wrong direction (with little torque). • High current and temperature protection. • Possibilities of motor control • Direction function and brake function THE OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) The OTA is an uncommitted amplifier with a high output current (40 mA) that can be used as a control amplifier or as a level converter in a Switched Mode Power Supply (SMPS). The common mode input range includes ground (GND) and rises to VP − 1.7 V. The high sink current enables the OTA to drive a power transistor directly in an analog control amplifier or in a SMPS driver. The capacitor is charged with a current of 57 µA from 0.2 to 0.3 V. Above this level, it is charged with a current of 5 µA up to 2.2 V only if the selected motor EMF remains in the wrong polarity (watchdog function). At the end, or, if the motor voltage becomes positive, the capacitor is discharged with a current of 28 µA. The watchdog time is the time taken to charge the capacitor, with a current of 5 µA, from 0.3 to 2.2 V. Although the gain is not extremely high (0.3 S), care must be taken with the stability of the circuit if the OTA is used as a linear amplifier as no frequency compensation is provided. To ensure that the internal delays are covered CAP-TI must have a minimum value of 2 nF. For the watchdog function a value for CAP-TI of 10 nF is recommended. handbook, full pagewidth VMOT1 VSWH VSWM voltage on CAP-TI VSWL MGG994 If the chosen value of CAP-TI is too small, oscillations can occur in certain positions of a blocked rotor. If the chosen value is too large, then it is possible that the motor may run in the reverse direction (synchronously with little torque). Fig.4 Typical CAP-TI and VMOT1 voltage waveforms in normal running mode. 1997 Sep 12 7 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T The convention for the inputs (inverting or not) is the same as for a normal operational amplifier: with a resistor (as a load) connected from the output (AMP OUT) to the positive supply, a positive-going voltage is found when the non-inverting input (+AMP IN) is positive with respect to the inverting input (−AMP IN). Note that a ‘plus’ input causes less current, and consequently a positive voltage. DIRECTION FUNCTION • If the voltage on pin 7 is <2.3 V the motor is running in one direction (depending on the motor connections) • If pin 7 is floating or the voltage is >2.7 V the motor is running in the other direction. BRAKE FUNCTION MOTOR CONTROL • If the voltage on pin 9 (pin BRAKE) is <2.3 V the motor brakes; in this condition the external outputs are driven to a HIGH voltage level DC motors can also be operated with analog control using the OTA. • If pin 9 is floating or the voltage is >2.7 V the motor runs normally. For the analog control an external transistor is required. The OTA can supply the base current for this transistor and act as a control amplifier (see Fig.8). RELIABILITY FG SIGNAL The output stages are protected in two ways: The FG (Frequency Generator) signal is generated in the TDF5242T by using the zero-crossing of the motor EMF from the three motor windings and the commutation signal. • Current limiting of the ‘lower’ output transistors. The ‘upper’ output transistors use the same base current as the conducting ‘lower’ transistor (+15%). This means that the current to and from the output stages is limited. Output FG switches from HIGH-to-LOW on all zero crossings and from LOW-to-HIGH on all commutations. Output FG can source typically 75 µA and sink more than 3 mA. • Thermal protection of the six output transistors is achieved in such a way that the transistors are switched off when the junction temperature becomes too high. Example: a 3-phase motor with 6 magnetic pole-pairs at 1500 rpm and with a full-wave drive has a commutation frequency of 25 × 6 × 6 = 900 Hz, and generates a tacho signal of 900 Hz. 1997 Sep 12 8 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER CONDITIONS VP supply voltage VI input voltage; all pins except VMOT, CAP-ST, CAP-TI, CAP-CD and CAP-DC VVMOT VMOT input voltage VO output voltage MIN. MAX. UNIT 4 18 V −0.3 VP + 0.5 V 3 18 V FG GND VP V AMP OUT − 18 V OUT-NA, OUT-NB and OUT-NC − VVMOT − 0.9 V OUT-PA, OUT-PB and OUT-PC 0.2 − V VI < 18 V VI input voltage CAP-ST, CAP-TI, CAP-CD and CAP-DC − 2.5 V Tstg storage temperature −55 +150 °C Tamb operating ambient temperature −40 +85 °C Ptot total power dissipation see Fig.5 − − Ves electrostatic handling see Chapter “Handling” − 500 V HANDLING Every pin withstands the ESD test according to “MIL-STD-883C class 2”. Method 3015 (HBM 1500 Ω, 100 pF) 3 pulses + and 3 pulses − on each pin referenced to ground. MGG989 3 handbook, halfpage Ptot (W) 2 QUALITY SPECIFICATION In accordance with “SNW-FQ-611-E”. The number of the quality specification can be found in the ”Quality Reference Handbook”. The handbook can be ordered using the code 9397 750 00192. 1 0 −50 0 50 100 150 200 Tamb (°C) Fig.5 Power derating curve. 1997 Sep 12 9 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T CHARACTERISTICS VP = 14.5 V ±10%; Tamb = −40 to +85 °C; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply VP supply voltage note 1 4 − 18 V IP supply current note 2 − 5.2 6.25 mA VVMOT input voltage to the output driver stages see Fig.1 3 − 18 V 150 °C Thermal protection TSD temperature at temperature sensor causing shut-down 130 140 ∆T decrease in temperature before switch-on after shut-down − TSD − 30 − K −0.5 − VVMOT V COMP-A, COMP-B, COMP-C and MOT0 VI input voltage II input bias current 0.5 V < VI < VVMOT − 1.5 V −10 VCSW comparator switching level note 3 − 0 µA ±20 ±25 ±30 mV ∆VCSW variation in comparator switching levels −3 0 +3 mV Vhys comparator input hysteresis − 75 − µV upper transistor; IO = −100 mA; Tamb = 25 °C −1.05 − − V lower transistor; IO = 10 mA; Tamb = 25 °C − − 0.35 V upper transistor; −1.05 IO = −10 mA; Tamb = 25 °C − − V − lower transistor; IO = 100 mA; Tamb = 25 °C − 0.35 V Tamb = 25 °C OUT-NA, OUT-NB, OUT-NC, OUT-PA, OUT-PB and OUT-PC VO(n) VO(p) n-channel driver output voltage p-channel driver output voltage ∆VOL variation in saturation voltage between lower transistors IO = 100 mA; Tamb = 25 °C − − 180 mV ∆VOH variation in saturation voltage between upper transistors IO = −100 mA; Tamb = 25 °C − 180 mV ILIM current limiting lower transistor; RO = 47 Ω 150 180 250 mA − +AMP IN and −AMP IN VI input voltage −0.3 − VP − 1.7 V differential mode voltage without ‘latch-up’ − − ±VP V Ib input bias current Tamb = 25 °C − − 650 nA CI input capacitance Tamb = 25 °C − 4 − pF Voffset input offset voltage − − 10 mV 1997 Sep 12 10 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit SYMBOL PARAMETER TDF5242T CONDITIONS MIN. TYP. MAX. UNIT AMP OUT (open collector) Isink output sink current Vsat saturation voltage VO output voltage SR slew rate gm(tr) transfer gain II = 40 mA RL = 330 Ω; CL = 50 pF 40 − − mA − 1.5 2.1 V −0.5 − +18 V 40 − − mA/µs 0.3 − − S DIR VIL LOW level input voltage (reverse rotation) reverse mode; 4 V < VP < 18 V − − 2.3 V VIH HIGH level input voltage (normal rotation) normal mode; 4 V < VP < 18 V 2.7 − − V IIL LOW level input current (reverse rotation) reverse mode; Tamb = 25 °C − −20 − µA IIH HIGH level input current (normal rotation) normal mode; Tamb = 25 °C − 0 − µA brake-mode voltage enable brake mode; 4 V < VP < 18 V − − 2.3 V normal mode; 4 V < VP < 18 V 2.7 − − V brake mode; Tamb = 25 °C − −20 −30 µA normal mode; Tamb = 25 °C − 0 20 µA 0.4 V BRAKE VBM II input current FG (push-pull) VOL LOW level output voltage IO = 1.6 mA − − VOH HIGH level output voltage IO = −60 µA − VP − 0.3 − tTHL HIGH-to-LOW transition time Tamb = 25 °C; CL = 50 pF; RL = 10 kΩ − 0.5 − f FG -------------f comm ratio of FG frequency and commutation frequency Tamb = 25 °C − 1 − V µs CAP-ST Isink output sink current 1.5 2.0 2.5 µA Isource output source current −2.5 −2.0 −1.5 µA VSWL LOW level switching voltage Tamb = 25 °C − 0.20 − V VSWH HIGH level switching voltage Tamb = 25 °C − 2.20 − V 1997 Sep 12 11 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit SYMBOL PARAMETER TDF5242T CONDITIONS MIN. TYP. MAX. UNIT CAP-TI Isink output sink current Isource output source current 20 28 38 µA 0.2 V < VCAP-TI < 0.3 V −64 −57 −50 µA 0.3 V < VCAP-TI < 2.2 V −6.5 −5.5 −4.5 µA VSWL LOW level switching voltage Tamb = 25 °C − 50 − mV VSWM MIDDLE level switching voltage Tamb = 25 °C − 0.30 − V VSWH HIGH level switching voltage Tamb = 25 °C − 2.20 − V CAP-CD Isink output sink current 10.6 16.2 22 µA Isource output source current −5.3 −8.1 −11 µA Isink/Isource ratio of sink to source current 1.85 2.05 2.25 Tamb = 25 °C VIL LOW level input voltage 825 850 875 mV ∆V IL -----------∆T temperature coefficient of LOW level input voltage − −1.4 − mV/K VIH HIGH level input voltage 2.3 − 2.5 V CAP-DC Isink output sink current 10.1 15.5 20.9 µA Isource output source current −20.9 −15.5 −10.1 µA Isink/Isource ratio of sink to source current 0.9 1.025 1.15 Tamb = 25 °C VIL LOW level input voltage 825 850 875 mV ∆V IL -----------∆T temperature coefficient of LOW level input voltage − −1.4 − mV/K VIH HIGH level input voltage 2.3 − 2.5 V Notes 1. An unstabilized supply can be used. 2. VVMOT = VP; all other inputs at 0 V; all outputs at VP; IO = 0 mA. 3. Switching levels with respect to driver outputs OUT-NA, OUT-NB, OUT-NC, OUT-PA, OUT-PB and OUT-PC. 1997 Sep 12 12 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T APPLICATION INFORMATION handbook, full pagewidth RY 330 Ω (1) RX 1 kΩ 1 kΩ 10 nF n.c. 1 kΩ n.c. 18 nF 100 nF (1) 28 27 26 25 24 23 RY 22 21 20 19 18 17 16 15 9 10 11 12 13 14 TDF5242T (1) 1 2 3 4 5 6 7 8 RX n.c. 18 nF (1) FG RY VP (1) DIR BRAKE 1 µF RX 1 µF (1) VMOT MGG990 (1) RX = RY > 8 (VMOT − 1.5). Fig.6 Application diagram without use of the Operational Transconductance Amplifier (OTA) with bipolar power transistors. 1997 Sep 12 13 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T handbook, full pagewidth 330 Ω 1 kΩ 1 kΩ 10 nF n.c. 1 kΩ n.c. 28 27 26 25 24 23 22 21 18 nF 100 nF 20 19 18 17 16 15 9 10 11 12 13 14 TDF5242T 1 2 3 4 5 6 7 8 n.c. 18 nF FG VP DIR BRAKE 1 µF 1 µF VMOT MGG991 Fig.7 Application diagram without use of the Operational Transconductance Amplifier (OTA) with MOSFETs. 1997 Sep 12 14 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T BD434 handbook, full pagewidth +14 V 39 kΩ 10 kΩ 680 Ω 470 Ω 47 nF 1 µF 120 Ω 21 from DAC 47 kΩ 19 20 220 nF 18 nF 47 nF 6 TDF5242T 16 START-UP OSCILLATOR 15 ADAPTIVE COMMUTATION DELAY 14 28 OUT-PA 27 OUT-NA 18 nF TEST 10 nF FG to microcontroller 8 THERMAL PROTECTION TIMING 2 OUT-PB COMMUTATION LOGIC 18 10 1 OUT-NB ROTATION SPEED AND DETECTOR OUTPUT STAGE 4 OUT-PC DIRECTION LOGIC 5 OUT-NC GND2 11 BRAKE LOGIC 22 GND1 3 +5 V 23 24 26 13 EMF COMPARATORS n.c. 12, 17, 25 7 9 MGG992 DIR BRAKE Fig.8 Application of the TDF5242T as a scanner driver, with the use of the uncommitted on-chip OTA. 1997 Sep 12 15 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T PACKAGE OUTLINE SO28: plastic small outline package; 28 leads; body width 7.5 mm SOT136-1 D E A X c y HE v M A Z 15 28 Q A2 A (A 3) A1 pin 1 index θ Lp L 1 14 e bp 0 detail X w M 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y mm 2.65 0.30 0.10 2.45 2.25 0.25 0.49 0.36 0.32 0.23 18.1 17.7 7.6 7.4 1.27 10.65 10.00 1.4 1.1 0.4 1.1 1.0 0.25 0.25 0.1 0.9 0.4 inches 0.10 0.012 0.096 0.004 0.089 0.01 0.019 0.013 0.014 0.009 0.71 0.69 0.30 0.29 0.050 0.419 0.043 0.055 0.394 0.016 0.043 0.039 0.01 0.01 0.004 0.035 0.016 Z (1) θ 8o 0o Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. REFERENCES OUTLINE VERSION IEC JEDEC SOT136-1 075E06 MS-013AE 1997 Sep 12 EIAJ EUROPEAN PROJECTION ISSUE DATE 95-01-24 97-05-22 16 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T SOLDERING Wave soldering Introduction Wave soldering techniques can be used for all SO packages if the following conditions are observed: There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. • A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. • The longitudinal axis of the package footprint must be parallel to the solder flow. • The package footprint must incorporate solder thieves at the downstream end. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our “IC Package Databook” (order code 9398 652 90011). During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. Reflow soldering Reflow soldering techniques are suitable for all SO packages. Maximum permissible solder temperature is 260 °C, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 °C within 6 seconds. Typical dwell time is 4 seconds at 250 °C. Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary between 50 and 300 seconds depending on heating method. Typical reflow temperatures range from 215 to 250 °C. Repairing soldered joints Fix the component by first soldering two diagonallyopposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 °C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 °C. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 °C. 1997 Sep 12 17 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. 1997 Sep 12 18 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T NOTES 1997 Sep 12 19 Philips Semiconductors – a worldwide company Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. 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The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Printed in The Netherlands 297027/1200/02/pp20 Date of release: 1997 Sep 12 Document order number: 9397 750 02378