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| FEATURES DELIVERS UP TO 5A CONTINUOUS OUTPUT OPERATES AT SUPPLY VOLTAGES UP TO 60V TTL AND CMOS COMPATIBLE INPUTS NO "SHOOT-THROUGH" CURRENT THERMAL SHUTDOWN (OUTPUTS OFF) AT 160C SHORTED LOAD PROTECTION (to VS or PGND or SHORTED LOAD) * NO BOOTSTRAP CAPACITORS REQUIRED * PROGRAMMABLE ONBOARD PWM * * * * * * APPLICATIONS * * * * * * DC MOTOR DRIVES POSITION AND VELOCITY SERVOMECHANISMS FACTORY AUTOMATION ROBOTS NUMERICALLY CONTROLLED MACHINERY COMPUTER PRINTERS AND PLOTTERS AUDIO AMPLIFICATION 23 PIN SIP PACkAGE STYLE EX DESCRIPTION The SA56 is a 5A PWM Amplifier designed for motion control applications. The device is built using a multi-technology process which combines bipolar and CMOS control circuitry with DMOS power devices in the same monolithic structure. Ideal for driving DC and stepper motors; the SA56 accommodates peak output currents up to 10A. An innovative circuit which facilitates low-loss sensing of the output current has been implemented. On board PWM oscillator and comparator are used to convert an analog signal into PWM direction and magnitude for motor control applications, or to amplify audio signals using class D amplification. FIGURE 1. BLOCK DIAGRAM P R L E M I N I A R Y APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com 1 SA56 ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, VDD SUPPLY VOLTAGE, VS PEAK OUTPUT CURRENT (100mS) CONTINUOUS OUTPUT CURRENT POWER DISSIPATION POWER DISSIPATION (TA = 25C, Free Air) JUNCTION TEMPERATURE, TJ(MAX) ESD SUSCEPTIBILITY (Logic Signals Only) STORAGE TEMPERATURE, TSTG LEAD TEMPERATURE (Soldering, 10 sec.) JUNCTION TEMPERATURE, TJ ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS 5.5V 60V 10A 5A TBD 3W 150C 1500V -40C to +150C 300C -40C to +150C SPECIFICATIONS PARAMETER VS VDD SWITCH ON RESISTANCE, RDS(ON) N-Channel SWITCH ON RESISTANCE, RDS(ON) P-Channel CLAMP DIODE FORWARD DROP, VCLAMP LOGIC LOW INPUT VOLTAGE, VIL LOGIC LOW INPUT CURRENT, IIL LOGIC HIGH INPUT VOLTAGE, VIH LOGIC HIGH INPUT CURRENT, IIH CURRENT SENSE OUTPUT CURRENT SENSE LINEARITY TEST CONDITIONS MIN 12 4.5 TYP MAX 60 5.5 0.6 0.6 UNITS V V V V A V A A mA % % % C mA mA ns ns ns ns ns ns ns ns ns KHz V mA V ns Output Current = 5A Output Current = 5A Clamp Current = 5A VIN = -0.1V VIN = 5.5V IOUT = 1A IOUT = 5A 1A IOUT 5A 100 mA IOUT 5A 5A IOUT 10A (Peak Currents only) Outputs Turn OFF No Load, FSW = 23KHz 50% DUC No Load, FSW = 23KHz 50% DUC Sourcing Outputs, IOUT = 1A Sinking Outputs, IOUT = 1A Sourcing Outputs, IOUT = 1A Sinking Outputs, IOUT = 1A Sourcing Outputs, IOUT = 1A Sinking Outputs, IOUT = 1A Sourcing Outputs, IOUT = 1A Sinking Outputs, IOUT = 1A 0.25 0.3 -0.5 -10 2 -10 1.43 SHUTDOWN TEMPERATURE, TJSD QUIESCENT SUPPLY CURRENT, IS QUIESCENT SUPPLY CURRENT, IDD OUTPUT TURN-ON DELAY TIME, tDon OUTPUT TURN-ON SWITCHING TIME, ton OUTPUT TURN-OFF DELAY TIMES, tDoff OUTPUT TURN-OFF SWITCHING TIME, toff MINIMUM INPUT PULSE WIDTH, tp (DIGITAL MODE) PWM FREQUENCY (DIGITAL MODE) REFERENCE VOLTAGE Vref OUTPUT CURRENT (Vref 2.5V) ANALOG INPUT RANGE FOR FULL MODULATION HIGH CURRENT SHUTDOWN RESPONSE NOTE: These specifications apply for VS = 50V and VDD = 5V at 25C, unless otherwise specified. P R L E M I N I 2.4 1 A 300 1.3 1 160 12 6 61 66 51 51 59 54 70 70 100 2.5 R TBD 0.8 +10 VDD 10 350 1.5 5 8 8 Y TBD 15 500 2.6 1 4 250 800 Source Only, No current sink capability Load Current = 400A Output shorted (No bypass capacitor at SCin pin) APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 2 TYPICAL PERFORMANCE GRAPHS SA56 P R L E M I N I A R Y APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com 3 SA56 TYPICAL PERFORMANCE GRAPHS P 4 R L E M I N I A R Y APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 OPERATING CONSIDERATIONS SA56 7 TLIM Temperature limit, CMOS. This pin can be used as a flag for an over temperature condition. Under normal operation this pin will be logic low. When junction temperature exceeds approximately 160C this pin will change to logic high and the output will be latched off. Grounding this pin disables over temperature protection. This pin should be left open if over temperature protection is desired but the flag is not used. ISEN/ /ILIM Current Sense output and programmable current limit. A current proportional to output current is sourced by this pin. Typically this pin is connected to a resistor for programmable current limit or transconductance operation. GND(Sig) Ground connection for all internal digital and low current analog circuitry. FAULT Protection circuit flag output, CMOS. The fault pin will be logic high when the output MOSFETs have been automatically latched off because of a short circuit or over temperature condition. This pin should be left open if not used. CPWM An external timing capacitor is connected to this pin to set the frequency of the internal oscillator and ramp generator for analog control mode. The capacitor value (pF) = 4.05x107/FSW, where FSW = the desired switching frequency. This pin is grounded for digital control mode. VDD 5V supply for input logic and low voltage analog circuitry. VREF Reference voltage. Can be used at low current for biasing analog loop circuits. DIR Direction logic input, CMOS/TTL. Determines the active output MOSFETs in two quadrant digital control mode. This pin should be grounded for analog control mode. PWM CMOS/TTL input for digital PWM control, or 1-4V analog input for duty cycle control in analog control mode. DISABLE Disable logic input, CMOS/TTL. Logic low on this pin allows the SA56 to function normally. When pulled to logic high, all four output MOSFETs are disabled. Pulling this pin high, then low will reset a latched fault condition caused by a short circuit or over temperature fault. Aout Half bridge output A GENERAL Please read Application Note 1 "General Operating Considerations" which covers stability, power supplies, heat sinking, mounting, and specification interpretation. Visit www.apexmicrotech.com for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit, heat sink selection, Apex's complete Application Notes library, Technical Seminar Workbook and Evaluation Kits. GROUND PINS There are 4 GND pins. Pins 9 & 10 are for input signal GND and pins 1 and 23 are for power gnd. 8 POWER SUPPLY BYPASSING Bypass capacitors to power supply terminals Vs and VDD must be connected physically close to the pins to prevent erratic, low efficiency operation and excessive ringing at the outputs. Electrolytic capacitors, at least 10F per output amp, are required for suppressing Vs to PGND noise. High quality ceramic capacitors (X7R) 1F or greater should also be used. Only capacitors rated for switching applications should be considered. The bypass capacitors must be located as close to the power supply pins as possible (due to the very fast switching times of the outputs, the inductance of 1 inch of circuit trace could cause noticeable degradation in performance). The bypassing requirements of VDD are less stringent, but still necessary. A 0.1F to 0.47F capacitor connected directly between the VDD and GND (SIG) pins will suffice. 9,10 11 12 PIN DESCRIPTIONS Pin # 1,23 Name PGND Description Power ground, high current ground return path of the motor. Half bridge output B High voltage supply Short circuit detect, CMOS. This pin can be used as a flag for a short circuit condition. Under normal operation this pin will be logic low. When a short circuit is detected, or output current exceeds approximately 10A, this pin will change to logic high and the output will be latched off. Grounding this pin disables short circuit protection. This pin should be left open if short circuit protection is desired but the flag is not used. Short circuit protection functions independently of programmable current limit (ISEN). It is nessesary to bypass the SCin pin with a 14-47pF ceramic capacitor. This capacitor will add a delay to the short circuit response but the device will still be able to protect itself against short circuit and over current. 2,3 Bout 4,5,19,20 VS 6 SCin 13,14 15 16 P R L E M I 17 18 N I A R Y 21,22 APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com 5 SA56 MODES OF OPERATION The following chart shows the four modes of operation. Mode 2 Quad Digital 2 Quad Digital 4 Quad Digital CPWM GND PWM Modulation In Modulation In High DIR High Aout High Bout PWM OPERATING CONSIDERATIONS 2 QUADRANT DIGITAL MODE For sign/magnitude (2 quadrant) operation, two digital input signals are required. A digital PWM signal to the PWM pin can control the output duty cycle at one output pin with the other output pin held "HIGH". The digital input on the DIR pin will control direction by selecting the outputs that switch according to the PWM input. If DIR is a logic "HIGH", the A output will be held "HIGH" and the B output will be switched as the inverse of the PWM input signal. If DIR is logic "LOW", the B output will be held "HIGH" and the A output will be switched. Operating in 2 quadrant mode reduces switching noise and power dissipation, but limits the control of the motor at very low speed. A braking function can be achieved by holding the PWM input "LOW", which will turn both of the upper MOSFETs on, rapidly reducing the circulating current of the motor winding. GND Low PWM High GND Modulated In Not used but GND DIR DIR 4 Add Drive Quad Cap. to with Analog set analog Fresignal quency Greater Greater than 50% than 50% high for a high for a low high input input ANALOG INPUT OPERATION The SA56 can operate with analog or digital inputs. In the analog mode, the capacitor from CPWM to GND (SIG) sets the frequency of an internal triangular ramp signal. An analog input at the PWM pin is compared to the ramp to generate the duty cycle of the output. In Analog mode, the digital input on the DIR pin is ignored, though this pin should never be left floating. 4 QUADRANT DIGITAL MODE OPERATING WITH DIGITAL INPUTS Two and 4 quadrant operation are possible with the SA56 when driven with a digital PWM signal from a microcontroller or DSP. When using a digital modulation signal, tie the CPWM pin to GND to disable the internal oscillator and ramp generator. When operating in the digital mode, pulse widths should be no less than 100ns and the switching frequency should remain less than 500KHz. This will allow enough time for the output MOSFETs to reach their full on/off state before receiving a command to reverse state. P R L E M I During 4 quadrant operation a single digital PWM input includes magnitude and direction information. The digital PWM input signal is applied to the DIR pin and the PWM/INPUT pin is tied to "HIGH". Both pairs of output MOSFETs will switch in a locked anti-phase fashion from 0-100% duty cycle. With a 50% duty cycle the average voltage of each output will be half of Vs, and the differential voltage applied to the load will be zero. Four quadrant operation allows smooth transitions through zero current for position servos and low speed applications. Power dissipation is slightly higher since all four output MOSFETs switch every cycle. N I A R Y APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739 6 OPERATING CONSIDERATIONS SA56 CURRENT SENSE LINEARITY CALCULATION The current sense linearity is calculated using the method described below: a) Define straight line (y = mx + c) joining the two end data points where, m is the slope and c is the offset or zero crossover. Calculate the slope m and offset c using the extreme data points. Assume Isense in the y axis and Iload in the x axis. b) Calculate linear Isense (or ideal Isense value, ISIDEAL) using the straight line equation derived in step (a) for the Iload data points. c) Determine deviation from linear Isense (step (b)) and actual measured Isense value (ISACTUAL) as shown below: PROTECTION CIRCUITS Thermal and short circuit protection are included in the SA56 to prevent damage during fault conditions. High current protection circuits will sense a direct short from either output to GND or Vs as well as across the load. The thermal protection will engage when the temperature of the MOSFETs reach approximately 160C. The FAULT output pin will go "HIGH" if either protection circuits engages and will place all MOSFETs in the "OFF" state (high impedance output). The SC or TLIM output will also go "HIGH", to indicate which of the protection features has been triggered. The fault going high disables the 4 output transistors. To reset the fault condition, cycle the VDD power or bring the DISABLE pin "HIGH" then "LOW". The most severe condition for any power device is a direct, hard-wired ("screwdriver") short from an output to ground. While the short circuit protection will latch the output MOSFETs within 250ns (typical) the die and package may be required to dissipate up to 600 Watts of power until the protection is engaged. This energy can be destructive, particularly at higher operating voltages, so good thermal design is critical if such fault tolerance is required of the system. IC REV C ERRATA INFORMATION This document describes the errata information for SA56 rev C full H-Bridge DC motor driver. Rev C parts can be identified by date code 0206 marked on the EX package. Errata Number Description and Date 1 Dated: 3/3/06 PROGRAMMABLE CURRENT LIMIT The ISEN pin sources a current proportional to the forward output current of the active P channel output MOSFET. The proportionality is 300A (nom) per ampere of output current. The ISEN output is blocked during the switching transitions when current spikes can be significant. To create a programmable current limit, connect a resistor from ISEN out to GND. When the voltage across this resistor exceeds internally generated 2.75V threshold, all 4 output MOSFETs will be turned off for the remainder of the switching cycle. A 2.75K resistor will set the current limit to approximately 5 Amps. The ISEN output can also be used for maintaining a current control loop in torque motor applications. P R L E M I Note: The errata items described in the table above are strictly for beta samples and will be rectified to conform to SA56U specifications for the production parts. N I TLIM pin: This pin is modified to serve as a flag for any fault occurrence including short-circuit, over current and over temperature. A R Impact Impact: Grounding the TLIM pin disables all fault protection mechanisms in the SA56 including SC, over current and over temp. This pin should be left floating at all times unless the user desires to disable all protection mechanisms. Y APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * inaccuracies or omissions. All specifications are subject to change without notice. This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com SA56U REV 10 MARCH 2006 (c) 2006 Apex Microtechnology Corp. 7 |
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