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PULSE WIDTH MODULATION AMPLIFIER
SA03
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
* * * * * * WIDE SUPPLY RANGE--16-100V 30A CONTINUOUS TO 60 C CASE 3 PROTECTION CIRCUITS ANALOG OR DIGITAL INPUTS SYNCHRONIZED OR EXTERNAL OSCILLATOR FLEXIBLE FREQUENCY CONTROL
SA03
USA TE9493 11
BeO
APPLICATIONS
* * * * * * MOTORS TO 4HP REACTIVE LOADS LOW FREQUENCY SONAR LARGE PIEZO ELEMENTS OFF-LINE DRIVERS C-D WELD CONTROLLER
EXTERNAL CONNECTIONS
DESCRIPTION
The SA03 is a pulse width amplifier that can supply 3000W to the load. An internal 45kHz oscillator requires no external components. The clock input stage divides the oscillator frequency by two, which provides the basic switching of 22.5 kHz. External oscillators may also be used to lower the switching frequency or to synchronize multiple amplifiers. Current sensing is provided for each half of the bridge giving amplitude and direction data. A shutdown input turns off all four drivers of the H bridge output. A high side current limit and the programmable low side current limit protect the amplifier from shorts to supply or ground in addition to load shorts. The H bridge output MOSFETs are protected from thermal overloads by directly sensing the temperature of the die. The 12pin hermetic MO-127 power package occupies only 3 square inches of board space.
CLK IN CLK OUT +PWM -PWM/RAMP GND ILIM/SHDN
1 2 3 4 5 6 TOP VIEW 12 11 10 9 8 7
ISENSE A A OUT * VCC * +VS B OUT I SENSE B
Case tied to pin 5. Allow no current in case. Bypassing of supplies is required. Package is Apex MO-127 (STD). See Outline Dimensions/Packages in Apex data book. If +PWM > RAMP/-PWM then A OUT > B OUT. * See text.
BLOCK DIAGRAM AND TYPICAL APPLICATION
Vcc 10 +PWM 3
CURRENT LIMIT PWM
9 +VS
4 -PWM/RAMP 470pF 56K CLK OUT 2 OSC /2 SHUTDOWN CONTROL 1 5 CONTROL SIGNAL 3/7V 5V GND OUTPUT DRIVERS 8 MOTOR 11 A OUT 1K I SENSE A 12 6 ILIM/SHDN 7 I SENSE B RSENSE .01F B OUT
CLK IN
5K
RSENSE 1K
5V
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
This Material Copyrighted By Its Respective Manufacturer
SA03
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS SUPPLY VOLTAGE, VCC POWER DISSIPATION, internal TEMPERATURE, pin solder - 10s TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case INPUT VOLTAGE, +PWM INPUT VOLTAGE, -PWM INPUT VOLTAGE, ILIM TEST CONDITIONS2 MIN
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
SPECIFICATIONS
PARAMETER CLOCK (CLK) CLK OUT, high level4 CLK OUT, low level4 FREQUENCY RAMP, center voltage RAMP, P-P voltage CLK IN, low level4 CLK IN, high level4 OUTPUT TOTAL RON EFFICIENCY, 10A output SWITCHING FREQUENCY CURRENT, continuous4 CURRENT, peak4 POWER SUPPLY VOLTAGE, VS VOLTAGE, VCC CURRENT, VCC CURRENT, VCC, shutdown CURRENT, VS ILIM/SHUTDOWN TRIP POINT INPUT CURRENT THERMAL3 RESISTANCE, junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case NOTES: 1. 2. 3. 4. 5.
100V 16V 300W 300C 150C -65 to +150C -55 to +125C 0 to +11V 0 to +11V 0 to +10V TYP MAX UNITS
IOUT 1mA IOUT 1mA
4.8 0 44 0 3.7
45 5 4
5.3 .4 46 .9 5.4
V V kHz V V V V
.16 VS = 100V OSC in / 2 60C case 22 30 40 97 22.5 23
% kHz A A
Full temperature range Full temperature range IOUT = 0 No Load
165 14
60 15
100 16 80 50 50
V V mA mA mA
90
110 100
mV nA
Full temperature range, for each die Full temperature range Meets full range specifications
.83 12 -25 +85
C/W C/W C
Each of the two active output transistors can dissipate 150W. Unless otherwise noted: TC = 25C, VS, VCC at typical specification. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF. For guidance, refer to the heatsink data sheet. Guaranteed but not tested. If 100% duty cycle is not required VS(MIN) = 0V. The SA03 is constructed from MOSFET transistors. ESD handling procedures must be observed. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850C to avoid generating toxic fumes.
CAUTION
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
This Material Copyrighted By Its Respective Manufacturer
TYPICAL PERFORMANCE GRAPHS
SA03
CLOCK LOADING
NORMALIZED FREQUENCY, (%) NORMALIZED FREQUENCY, (%)
30 100 99 98
INTERNAL POWER DISSIPATION, (W)
POWER DERATING
150 125 100 75 50 25 0 0 75 100 50 125 25 CASE TEMPERATURE, (C)
EACH ACTIVE OUTPUT TRANSISTOR
CLOCK FREQUENCY OVER TEMP
102.0 101.5 101.0 100.5 100 99.5 99.0 98.5 98.0 -50 -25 0 25 50 75 100 125 CASE TEMPERATURE, (C)
97 96 F NOMINAL = 45kHz 95 100K 1M 10K CLOCK LOAD RESISTANCE, ()
REVERSE DIODE
3
TOTAL VOLTAGE DROP
10 CASE TEMPERATURE 60C 85C 100C 125C
FLYBACK CURRENT, Isd (A)
2
10
9 7 6 5 4 3 2
TOTAL VOLTAGE DROP, (V)
8 6 4 2
1
8 7 6 5
-25C 0 0 -55C
25C
0.8 1.0 1.2 1.4 1.6 0.6 SOURCE TO DRAIN DIODE VOLTAGE
5 10 15 20 25 OUTPUT CURRENT, (A)
CONTINUOUS OUTPUT
30 28
DUTY CYCLE VS ANALOG INPUT
100 B OUT 80
NORMALIZED Vcc QUIESCENT CURRENT, (%)
Vcc QUIESCENT CURRENT
100 95 90 85 80 75
CONTINUOUS AMPS
26 24 22 20 18 16 25 50 75 100 125 150 CASE TEMPERATURE, (C)
DUTY CYCLE, (%)
60 40 20 A OUT 0 3 4 5 6 ANALOG INPUT, (V) 7
5 10 15 20 25 SWITCHING FREQUENCY, F (kHz)
NORMALIZED Vcc QUIESCENT CURRENT, (%)
NORMALIZED Vs QUIESCENT CURRENT, (%)
115 110 105 100 95 90 85 80 -50 -25 0 25 50 75 100 125 CASE TEMPERATURE, (C) SHUTDOWN OPERATION NORMAL OPERATION Vcc = 15V F = 22.5 kHz
180 160 140 120 -55C 100 80 60 40 20 0 20 40 60 Vs, (V) 80 100 125C
NORMALIZED Vs QUIESCENT CURRENT, (%)
Vcc QUIESCENT CURRENT
Vs QUIESCENT VS VOLTAGE
Vs QUIESCENT VS FREQUENCY
100 Vs = 60V, NO LOAD 90 80 70 60 50 40 10 15 20 5 25 SWITCHING FREQUENCY, F (kHz)
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
This Material Copyrighted By Its Respective Manufacturer
OPERATING CONSIDERATIONS
SA03
noise spikes could trip the current limit threshold which is only 100 mV. RFILTER and C FILTER should be adjusted so as to R LIMIT reduce the switching noise well I SENSE B below 100 mV to prevent false current limiting. The sum of the R LIMIT DC level plus the noise peak will determine the SHUTDOWN current limiting I LIMIT/SHDN R SIGNAL FILTER value. As in most switching circuits R SHDN C FILTER it may be difficult to determine the true noise ampliFIGURE B. CURRENT LIMIT WITH tude without SHUTDOWN CURRENT MODE. careful attention to grounding of the oscilloscope probe. Use the shortest possible ground lead for the probe and connect exactly at the GND terminal of the amplifier. Suggested starting values are CFILTER = .01uF, RFILTER = 5k .
I SENSE A 1K
GENERAL
Helpful information about power supplies, heatsinking and mounting can be found in the "General Operating Considerations" section of the Apex data book. For information on the package outline, heatsinks, and mounting hardware see the "Package Outlines" and "Accessories" section of the data book. Also see Application Note 30 on "PWM Basics."
CLOCK CIRCUIT AND RAMP GENERATOR
The clock frequency is internally set to a frequency of approximately 45kHz. The CLK OUT pin will normally be tied to the CLK IN pin. The clock is divided by two and applied to an RC network which produces a ramp signal at the -PWM/ RAMP pin. An external clock signal can be applied to the CLK IN pin for synchronization purposes. If a clock frequency lower than 45kHz is chosen an external capacitor must be tied to the -PWM/RAMP pin. This capacitor, which parallels an internal capacitor, must be selected so that the ramp oscillates 4 volts p-p with the lower peak 3 volts above ground.
PWM INPUTS
The full bridge driver may be accessed via the pwm input comparator. When +PWM > -PWM then A OUT > B OUT. A motion control processor which generates the pwm signal can drive these pins with signals referenced to GND.
PROTECTION CIRCUITS
In addition to the externally programmable current limit there is also a fixed internal current limit which senses only the high side current. It is nominally set to 140% of the continuous rated output current. Should either of the outputs be shorted to ground the high side current limit will latch off the output transistors. Also, the temperature of the output transistors is continually monitored. Should a fault condition occur which raises the temperature of the output transistors to 165C the thermal protection circuit will activate and also latch off the output transistors. In either case, it will be necessary to remove the fault condition and recycle power to VCC to restart the circuit.
The required value of RLIMIT in voltage mode may be calculated by: RLIMIT = .1 V / ILIMIT where RLIMIT is the required resistor value, and ILIMIT is the maximum desired current. In current mode the required value of each RLIMIT is 2 times this value since the sense voltage is divided down by 2 (see Figure B). If RSHDN is used it will further divide down the sense voltage. The shutdown divider network will also have an effect on the filtering circuit.
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 1F ceramic capacitor in parallel with another low ESR capacitor of at least 10F per amp of output current. Capacitor types rated for switching applications are the only types that should be considered. The bypass capacitors must be physically connected directly to the power supply 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 .1F to .47F ceramic capacitor connected directly to the Vcc pin will suffice.
CURRENT LIMIT
There are two load current sensing pins, I SENSE A and I SENSE B. The two pins can be shorted in the voltage mode connection but both must be used in the current mode connection (see figures A and B). It is recommended that RLIMIT resistors be non-inductive. Load current flows in the I SENSE pins. To avoid errors due to lead lengths connect the I LIMIT/ SHDN pin directly to the R LIMIT resistors I SENSE A (through the filter network and shutdown diR LIMIT I SENSE B vider resistor) and connect the RLIMIT resis1K SHUTDOWN tors directly to the GND I LIMIT/SHDN R FILTER SIGNAL pin. Switching noise R SHDN C FILTER spikes will invariably be found at the I SENSE pins. The FIGURE A. CURRENT LIMIT WITH
SHUTDOWN VOLTAGE MODE.
STARTUP CONDITIONS
The high side of the all N channel output bridge circuit is driven by bootstrap circuit and charge pump arrangement. In order for the circuit to produce a 100% duty cycle indefinitely the low side of each half bridge circuit must have previously been in the ON condition. This means, in turn, that if the input signal to the SA03 at startup is demanding a 100% duty cycle, the output may not follow the command and may be in a tristate condition. The ramp signal must cross the input signal at some point to correctly determine the output state. After the ramp crosses the input signal level one time, the output state will be correct thereafter.
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. SA03U REV. E MARCH 1999 (c) 1999 Apex Microtechnology Corp.
This Material Copyrighted By Its Respective Manufacturer

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