(800) 546-APEX (800) 546-2739 FEATURES 250kHz SWITCHING

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(800) 546-APEX (800) 546-2739 FEATURES 250kHz SWITCHING

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SA02
(800) 546-APEX
(800) 546-2739
FEATURES
250kHz SWITCHING FULL BRIDGE OUTPUT 16-80V (160V P-P) OUTPUT FAULT PROTECTION SHUTDOWN CONTROL SYNCHRONIZABLE CLOCK HERMETIC PACKAGE
SA02
APPLICATIONS
AIRCRAFT AUDIO AMPLIFIER BRUSH TYPE MOTOR CONTROL VIBRATION CANCELLING AMPLIFIER
EXTERNAL CONNECTIONS
RAMP/-PWM +PWM
ILIM/SHDN ISENSE ISENSE LIMIT LIMIT
DESCRIPTION
SA02 amplifier volt, 250kHz amplifier. full bridge output circuit provides amps continuous drive current applications diverse aircraft audio brush type motors. Clock output input pins used synchronization with other amplifiers externally generated clock. separate integrator amplifier also accessible integration varied application. Direct access input provided connection digital motion control circuits. Protection circuits guard against thermal overloads well shorts supply ground. current limit programmable with external resistors depending application. shutdown input disables output bridge drivers. DIP7 steel package hermetically sealed.
VIEW
Case tied Bypassing supplies required. Package Apex DIP7. Outline Dimensions/Packages Apex data book. +PWM RAMP/-PWM then ISENSE ISENSE text.
BLOCK DIAGRAM TYPICAL APPLICATION CONNECTIONS AIRCRAFT AUDIO
+PWM 1000pF 1000pF RAMP/-PWM
THERMAL, SHORT CIRCUIT PROTECT.
REG.
100K
100pF
ILIM/SHDN
LOAD
FILTER FILTER
SHDN
2.5V -INT SIGNAL
CLK/2 SENSE SENSE
LIMIT
2.5V
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
SA02
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, SUPPLY VOLTAGE, OUTPUT CURRENT, peak ±PWM ±INT VIN, ILIM/SHDN POWER DISSIPATION, internal TEMPERATURE, solder TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
156W1 300°C 150°C +150°C +125°C
SPECIFICATIONS
PARAMETER INTEGRATOR, CLOCK3 OFFSET VOLTAGE BIAS CURRENT OFFSET CURRENT COMMON MODE VOLTAGE RANGE COMMON MODE REJECTION, SLEW RATE OPEN LOOP GAIN GAIN BANDWIDTH PRODUCT CLOCK CLOCK OUT, high level CLOCK OUT, level CLOCK level CLOCK high level OUTPUT EFFICIENCY, output SWITCHING FREQUENCY CURRENT, continuous CURRENT, peak3 RDS(ON)3 POWER SUPPLY VOLTAGE, VOLTAGE, CURRENT, CURRENT, INPUTS3 ILIM/SHDN, trip point ±PWM COMMON MODE VOLTAGE THERMAL4 RESISTANCE, junction case RESISTANCE, junction TEMPERATURE RANGE, case NOTES: Full temperature range Full temperature range Meets full range specifications °C/W °C/W Full temperature range Full temperature range Switching, Load, V/µS TEST CONDITIONS2 UNITS
each active output transistors time. Unless otherwise noted: 25°C. values guaranteed tested. Long term operation maximum junction temperature will result reduced product life. Derate internal power dissipation achieve high MTTF. guidance, refer heatsink data sheet. SA02 constructed from MOSFET transistors. handling procedures must observed. internal substrate contains beryllia (BeO). break seal. accidentally broken, crush, machine, subject temperatures excess 850°C avoid generating toxic fumes.
CAUTION
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 APPLICATIONS HOTLINE: (800) 546-2739
TYPICAL PERFORMANCE GRAPHS
SA02
CLOCK LOADING
NORMALIZED FREQUENCY, NORMALIZED FREQUENCY,
INTERNAL POWER DISSIPATION,
POWER DERATING
99.5 99.0
CLOCK FREQUENCY OVER TEMP
102.0 101.5 101.0 100.5 99.5 99.0 98.5 98.0 CASE TEMPERATURE, (°C)
98.5 98.0 NOMINAL 500kHz 97.5 100K CLOCK LOAD RESISTANCE,
EACH ACTIVE OUTPUT TRANSISTOR
CASE TEMPERATURE, (°C)
REVERSE DIODE
INTEGRATOR GAIN
OPEN LOOP GAIN, (dB)
INTEGRATOR PHASE
OPEN LOOP PHASE,
FLYBACK CURRENT,
100K FREQUENCY, (Hz)
-135
SOURCE DRAIN DIODE VOLTAGE
-180
NORMALIZED QUIESCENT CURRENT,
100K FREQUENCY, (Hz)
CONTINUOUS OUTPUT
DUTY CYCLE ANALOG INPUT
OUTPUT
DUTY CYCLE,
QUIESCENT CURRENT
CONTINUOUS AMPS
OUTPUT
CASE TEMPERATURE, (°C)
NORMALIZED QUIESCENT CURRENT,
ANALOG INPUT,
SWITCHING FREQUENCY, (kHz)
NORMALIZED QUIESCENT CURRENT,
250kHz NORMAL OPERATION
-55°C 125°C 85°C 25°C
NORMALIZED QUIESCENT CURRENT,
QUIESCENT CURRENT
QUIESCENT VOLTAGE
QUIESCENT FREQUENCY
SWITCHING FREQUENCY, (kHz)
SHUTDOWN OPERATION
CASE TEMPERATURE, (°C)
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
SA02
TOTAL VOLTAGE DROP
TOTAL VOLTAGE DROP, 25°C -55°C OUTPUT, -25°C CASE TEMPERATURE 125°C 100°C 85°C 70°C
OPERATING CONSIDERATIONS
NOISE FILTERING
Switching noise enter SA02 through +PWM connection. wise precaution pass filter this connection. Adjust pass band filter times bandwidth required application. Keep resistor value ohms less since this resistor becomes part hysteresis circuit comparator.
LAYOUT
designer needs appreciate that SA02 combines circuit both high speed high power switching level analog signals. Certain layout rules thumb must considered when circuit board layout designed using SA02: Bypassing power supplies critical. Capacitors must connected directly power supply pins with very short lead lengths (well under inch). Ceramic chip capacitors best. Make ground connections with star pattern Beware capacitive coupling between output connections signal inputs through parasitic capacitance between layers multilayer designs. small signal traces between pins output section (pins 11-17). allow high currents flow into ground plane. Separate switching analog grounds connect only part star pattern.
GENERAL
Helpful information about power supplies, heatsinking mounting found "General Operating Considerations" section Apex data book. information package outline, heatsinks, mounting hardware "Package Outlines" "Accessories" section data book. Also Application Note "PWM Basics."
CLOCK CIRCUIT RAMP GENERATOR
clock frequency internally frequency approximately kHZ. will normally tied pin. clock divided applied network which produces ramp signal RAMP pin. external clock signal applied synchronization purposes. clock frequency lower than 500kHZ chosen external capacitor must tied RAMP pin. This capacitor, which parallels internal capacitor, must selected that ramp oscillates volts with lower peak 1.25 volts above ground.
INTEGRATOR
integrator provides inverted signal negative feedback also open loop gain overall application circuit accuracy. Recommended value CINT stability. However, poles zeroes added circuit overall loop stability required.
BYPASSING
Adequate bypassing power supplies required proper operation. Failure cause erratic efficiency operation well excessive ringing outputs. supply should bypassed with least ceramic capacitor parallel with another capacitor least 10µF output current. Capacitor types rated switching applications only types that should considered. bypass capacitors must physically connected directly power supply pins. Even inch lead length will cause excessive ringing outputs. This very fast switching times inductance lead connection. bypassing requirements supply less stringent, still necessary. .1µF .47µF ceramic capacitor connected directly will suffice.
CURRENT LIMIT
There load current sensing pins, SENSE SENSE pins shorted voltage mode connection both must used current mode connection (see figures recommended that RLIMIT resistors non-inductive. Load current flows SENSE pins. avoid errors lead lengths connect LIMIT/ SHDN directly RLIMIT resistors (through filter network shutdown divider resistor) connect RLIMIT resistors directly pin.
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 APPLICATIONS HOTLINE: (800) 546-2739
OPERATING CONSIDERATIONS
SA02
SHUTDOWN
LIMIT
SENSE
SENSE
LIMIT/SHDN FILTER
FILTER
SHUTDOWN SIGNAL
SHDN
FIGURE CURRENT LIMIT WITH SHUTDOWN VOLTAGE MODE.
SENSE
shutdown circuitry makes internal current limiting circuitry. functions externally combined voltage current modes shown below Figures RLIMIT resistors will normally very values considered zero this application. Figure RSHDN form voltage divider shutdown signal. After suitable noise filter designed current limit, adjust value RSHDN give minimum shutdown signal LIMIT/SHDN when shutdown signal high. Note that CFILTER will filter both current limit noise spikes shutdown signal. Shutdown current limit operate each cycle internal switching rate. long shutdown signal high output will disabled.
LIMIT
PROTECTION CIRCUITS
Circuits monitor temperature load each bridge output transistors. each cycle should fault condition detected output transistors bridge shut off. Faults protected against are: shorts across outputs, shorts ground, over temperature conditions. Should these faults detected, output transistors will latched off. fault must removed power recycled restart SA02. addition there built dead time during which output transistors off. dead time removes possibility momentary conduction path through upper lower transistors each half bridge during switching interval. Noise flyback observed outputs during this time high impedance outputs state. This will vary with nature load.
SENSE
LIMIT
LIMIT/SHDN FILTER
FILTER
SHUTDOWN SIGNAL
SHDN
FIGURE CURRENT LIMIT WITH SHUTDOWN CURRENT MODE.
Switching noise spikes will invariably found SENSE pins. noise spikes could trip current limit threshold which only RFILTER CFILTER should adjusted reduce switching noise well below prevent false current limiting. level plus noise peak will determine current limiting value. most switching circuits difficult determine true noise amplitude without careful attention grounding oscilloscope probe. shortest possible ground lead probe connect exactly terminal amplifier. Suggested starting values CFILTER .001uF, RFILTER required value RLIMIT voltage mode calculated RLIMIT ILIMIT where RLIMIT required resistor value, ILIMIT maximum desired current. current mode required value each RLIMIT times this value since sense voltage divided down (see Figure RSHDN used will further divide down sense voltage. shutdown divider network will also have effect filtering circuit.
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 (520) 888-3329 ORDERS (520) 690-8601 EMAILare subject change without notice. This data sheet been carefully checked believed reliable, however, responsibility assumed possible inaccuracies omissions. specifications prodlit@apexmicrotech.com
SA02U REV. DECEMBER 1998 1998 Apex Microtechnology Corp.

(800) 546-APEX (800) 546-2739 FEATURES 250kHz SWITCHING

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