® SA60 SA60 ct Innovation From P r o d uSA60 H-Bridge Motor Driver/Amplifiers FEATURES ♦ LOW COST COMPLETE H-BRIDGE ♦ SELF-CONTAINED SMART LOWSIDE/ HIGHSIDE DRIVE CIRCUITRY ♦ WIDE SUPPLY RANGE: UP TO 80V ♦ 10A CONTINUOUS OUTPUT ♦ ISOLATED CASE ALLOWS DIRECT HEATSINKING ♦ FOUR QUADRANT OPERATION, TORQUE CONTROL CAPABILITY ♦ INTERNAL/PROGRAMMABLE PWM FREQUENCY GENERATION APPLICATIONS DESCRIPTION The SA60 is a pulse width modulation amplifier that can supply 10A continuous current to the load. The full bridge amplifier can be operated over a wide range of supply voltages. All of the drive/control circuitry for the lowside and highside switches are internal to the hybrid. The PWM circuitry is internal as well, leaving the user to only provide an analog signal for the motor speed/direction, or audio signal for switchmode audio amplification. The internal PWM frequency can be programmed by an external integrator capacitor. Alternatively, the user may provide an external TTL-compatible PWM signal for simultaneous amplitude and direction control for four quadrant mode. ♦ BRUSH TYPE MOTOR CONTROL ♦ CLASS D SWITCHMODE AMPLIFIER ♦ REACTIVE LOADS ♦ MAGNETIC COILS (MRI) ♦ ACTIVE MAGNETIC BEARING ♦ VIBRATION CANCELLING BLOCK DIAGRAM DISABLE 3 10 +V s ANALOG IN 4 H-Bridge Drive Cf/PWM IN 2 11 B OUT 9 A OUT 2 6 ANALOG GND 1 1 555 4 8 7 49K 2.58K Vcc 7 SA60U www.cirrus.com Copyright © Cirrus Logic, Inc. 2010 (All Rights Reserved) 8 I sense A 12 Isense B 6 POWER GND MAR 20101 APEX − SA60UREVM ® SA60 Product Innovation From 1. CHARACTERISTICS AND SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Parameter Symbol Min Max Units SUPPLY VOLTAGE, +VS (Note 4) 80 V OUTPUT CURRENT, peak 15 A LOGIC SUPPLY VOLTAGE, VCC 16 V POWER DISSIPATION, internal (Note 3) 156 W TEMPERATURE, pin solder, 10s max. 260 °C TEMPERATURE, junction (Note 2) 150 °C TEMPERATURE RANGE, storage −40 85 °C OPERATING TEMPERATURE RANGE, case −25 85 °C The SA60 is constructed from MOSFET transistors. ESD handling procedures must be observed. The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. CAUTION SPECIFICATIONS Parameter Test Conditions1 Min Typ Max Units INPUT ANALOG INPUT VOLTAGES VCC = 12V A,B OUT = 50% Duty Cycle 1/2 VCC VDC A OUT = 100% Duty Cycle High 1/3 VCC VDC B OUT = 100% Duty Cycle High 2/3 VCC VDC PWM INPUT PWM PULSE LOW VOLTAGE 0 PWM PULSE HIGH VOLTAGE 2.7 PWM FREQUENCY 45 0.8 VDC 5.0 VDC 250 KHz DISABLE ON 2.7 VCC VDC DISABLE OFF 0 0.8 VDC 2.5 VDC OUTPUT VDS (ON) VOLTAGE, each MOSFET IDS = 10A 1.7 +VS = 80A 91 TOTAL RON, both MOSFETs EFFICIENCY, 10A OUTPUT 0.45 CURRENT, continuous 10 CURRENT, peak t = 100 msec SWITCHING FREQUENCY CF = 270pF A 15 DEAD TIME Ω % A 45 KHz 90 nS POWER SUPPLY +VS VOLTAGE (Note 4) +VS Current = Load Current VCC VOLTAGE VDC 12 15 VDC VCC CURRENT VCC = 12VDC 28 36 mA +VS CURRENT Switching, no load, VS = 50V 5 2 9.5 80 mA SA60U ® SA60 Product Innovation From Parameter Test Conditions1 Min Typ Max Units 1.6 °C/W THERMAL (Note 3) RESISTANCE, junction to case Full temperature range, for each transistor RESISTANCE, junction to air Full temperature range 30 TEMPERATURE RANGE, case -25 °C/W +85 °C NOTES: 1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken at typical supply voltages and TC = 25°C, VCC = 12VDC). 2. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve high MTTF. 3. Each of the two active output transistors can dissipate 78W. 4. Derate to 70V below TC = +25°C. POWER DERATING 35 VOLTAGE DROP, V 40 20 0 1.8 TC = 110°C TC = 85°C TC = 60°C 15 10 0 75 25 50 100 125 CASE TEMPERATURE, TC (C) Vs QUIESCENT VS VOLTAGE TC = 35°C 0 12 3 6 9 OUTPUT CURRENT, A 15 1.6 85°C 80 DUTY CYCLE (%) 1.4 1.2 25°C 1 0.8 0.6 60 40 20 30 40 50 Vs, (V) 60 Vs QUIESCENT VS SWITCH FREQ NORMALIZED QUIESCENT, Iq (X) 1.6 140 120 100 80 60 40 20 0 50 100 150 200 250 SWITCHING FREQUENCY, Fsw (KHz) Vcc IQ VS SWITCH FREQ 1.5 1.4 1.3 1.2 1.1 1 0.9 0.8 25 50 75 100 125 SWITCHING FREQUENCY, Fsw (KHz) 10 10 100 1000 EXTERNAL INTEGRATION CAP, C (pF) 1 0.1 0.6 0 1/6 5/6 1/3 1/2 2/3 ANALOG INPUT AS PROPORTION OF Vcc 70 80 100 10 NORMALIZED QUIES CURRENT, (X) 0.2 10 SA60U B OUT 20 0.4 0 A OUT Cf (pF) = (1.44E7/Fsw)–50 REVERSE DIODES DUTY CYCLE VS ANALOG INPUT 100 160 Vs QUIES CURRENT Iq (mA) 20 5 EACH OUTPUT TRANSISTOR 0 25 CLOCK FREQUENCY, Fsw (KHz) 30 60 PWM FREQ VS EXT INT CAP 1000 FLYBACK CURRENT ISD(A) INTERNAL POWER DISSIPATION, (W) NORMALIZED QUIES CURRENT (X) TOTAL VOLTAGE DROP 80 1.4 1.2 1.4 1.6 1.8 0.8 1 SOURCE TO DRAIN VOLTAGE Vcc QUIESCENT VS VOLTAGE 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 9 10 11 12 13 14 Vcc VOLTAGE (V) 15 16 3 ® SA60 Product Innovation From EXTERNAL CONNECTIONS 1 2 3 4 5 6 7 8 9 11 ‡ ‡ DISABLE PWM INPUT Vcc NC ANALOG INPUT 12 * * CF ANALOG GND 10 POWER GND ISENSE A ‡ Required RC network. See paragraph on transient shutdown. * Protection diodes are recommended for applications where +Vs exceeds 50V. * A OUT * +Vs ISENSE B B OUT 12-pin Power SIP PACKAGE STYLE DP Formed Leads Available See package style EE TYPICAL APPLICATION A wide variety of loads can be driven in either the voltage 11 LOAD mode or the current mode. The most common applications 9 SA60 use three external blocks: a low pass filter converting pulse 4 8 width data to an analog output, a difference amplifier to 12 monitor voltage or current and an error amplifier. Filter in3 2 ductors must be suitable for square waves at the switching frequency (laminated steel is generally not acceptable). Filter capacitors must be low ESR and rated for the expected ripple current. A difference amplifier with gain of less than one translates the differential output voltage to a single feedback voltage. Dashed line connections and a higher gain difference amplifier would be used for current control. The error amplifier integrates the difference between the input and feedback voltages to close the loop. GENERAL Please read Application Note 30 on "PWM Basics". Refer to Application Note 1 "General Operating Considerations" for helpful information regarding power supplies, heat sinking and mounting. Visit www.Cirrus.com for design tools that help automate pwm filter design; heat sink selection; Apex Precision Power’s complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits. PWM OSCILLATOR – INTERNAL OR EXTERNAL The SA60 contains an internal PWM oscillator whose frequency is determined by an external capacitor connected between pin 1 and pin 2. Maximum frequency is 125 kHz. The user may also disregard the internal PWM oscillator and supply the SA60 with an external TTL pulse generator up to 250KHZ. PIN DESCRIPTION VCC - is the low voltage supply for powering internal logic and drivers for the lowside and highside MOSFETS. The supplies for the highside drivers are derived from this voltage. VS - is the higher voltage H-bridge supply. The MOSFETS obtain the output current from this supply pin. The voltage on this pin is limited to +80V by the drive IC. The MOSFETS are rated at 100 volts. ISENSE A & B - These are tied to power gnd directly or through sense resistors. ANALOG GND - is the reference for the internal PWM oscillator. Connect this pin to pin 6. Connect low side of Vcc supply and any other supply used to generate analog input signals to ANALOG GND. ANALOG INPUT - is an analog input for controlling the PWM pulse width of the bridge. A voltage higher than Vcc/2 will produce greater than 50% duty cycle pulses out of B OUT. A voltage lower than Vcc/2 will produce greater than 50% duty cycle pulses out of A OUT. If using in the digital mode, bias this point at 1/2 the logic high level. DISABLE - Is the connection for disabling all 4 output switches. DISABLE high overrides all other inputs. When taken low, everything functions normally. An internal pullup to Vcc will keep DISABLE high if pin left open. 4 SA60U ® SA60 Product Innovation From PWM INPUT - Is the TTL compatible digital input for controlling the PWM pulse width of the bridge. A duty cycle greater than 50% will produce greater than 50% duty cycle pulses out of the A out. A duty cycle less than 50% will produce greater than 50% duty cycle from the B out. For analog inputs, the integration capacitor for the internal clock must be connected between this pin and analog ground. The internal switching frequency is programmable up to 125 kHz by selection of the integration capacitor. The formula is: CF (pF) = ( ) 1.44 x107 – 50 Fsw BYPASSING Adequate bypassing of the power supplies is required for proper operation. Failure to do so can cause erratic and low efficiency operation as well as excessive ringing at the outputs. The Vs supply should be bypassed with at least a 1µF ceramic capacitor in parallel with another low ESR capacitor of at least 10µF per amp of output current. Capacitor types rated for switching applications are the only types that should be considered. The 1µF ceramic capacitor must be physically connected directly to the Vs and POWER GND pins. Even one inch of lead length will cause excessive ringing at the outputs. This is due to the very fast switching times and the inductance of the lead connection. The bypassing requirements of the Vcc supply are less stringent, but still necessary. A .1µF to .47µF ceramic capacitor connected directly to the Vcc and ANALOG GND pins will suffice. PCB LAYOUT The designer needs to appreciate that the SA60 combines in one circuit both high speed high power switching and low level analog signals. Certain layout rules of thumb must be considered when a circuit board layout is designed using the SA60: 1. Bypassing of the power supplies is critical. Capacitors must be connected directly to the power supply pins with very short lead lengths (well under 1 inch). Ceramic chip capacitors are best. 2. Connect ANALOG GND to POWER GND with a conductor having no intermediate connections. Connect all Vs power supply, filter and load related ground connections to POWER GND keeping these conductors separate until reaching pin 6. Connect all Vcc power supply and input signal related ground connections to ANALOG GND keeping conductors separate until reaching pin 1. Do not allow ground loops to form by making additional ground connections at the low side of the physical power supplies. If ground plane is used do not allow more than 1mA to flow through it. 3. Beware of capacitive coupling between output connections and signal inputs through the parasitic capacitance between layers in multilayer PCB designs. 4. Do not run small signal traces between the pins of the output section (pins 8-12). CURRENT SENSE There are two load current sensing pins, I SENSE A and I SENSE B. The two pins can be shorted to POWER GND in the voltage mode connection but both must be used in the current mode connection. It is recommended that R SENSE resistors be non-inductive. Load current flows in the I SENSE pins. The SA60 has no internal current limit. TRANSIENT SUPPRESSION An RC network of a 100 pF Capacitor and a one ohm resistor is required as shown in the external connection diagram on page 1. This network assures proper operation under various loads. Minimal power is dissipated in the resistor. SA60U 5 SA60 ® Product Innovation From CONTACTING CIRRUS LOGIC SUPPORT For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America. For inquiries via email, please contact [email protected]. International customers can also request support by contacting their local Cirrus Logic Sales Representative. To find the one nearest to you, go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. 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