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SA08
MICROTECHNOLOGY
FEATURES
* * * * * * IGBT OUTPUTS WIDE SUPPLY RANGE--16-450V 20A TO 100C CASE 3 PROTECTION CIRCUITS SYNCHRONIZED OR EXTERNAL OSCILLATOR FLEXIBLE FREQUENCY CONTROL
APPLICATIONS
* * * * * * MOTORS REACTIVE LOADS MAGNETIC BEARINGS LARGE PIEZO ELEMENTS OFF-LINE DRIVERS C-D WELD CONTROLLER
EXTERNAL CONNECTIONS
12-PIN POWER DIP PACKAGE STYLE CR
DESCRIPTION
The SA08 is a pulse width modulation amplifier that can supply 9KW to the load. An internal oscillator requires no external components. The clock input stage divides the oscillator frequency by two, which provides the switching frequency of 22.5 kHz. The oscillator may also be used 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 IGBTs are protected from thermal overloads by directly sensing the temperature of the die. The 12-pin hermetic MO-127 power package occupies only 3 square inches of board space.
BLOCK DIAGRAM AND TYPICAL APPLICATION MOTOR TORQUE CONTROL
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
SA08
SUPPLY VOLTAGE, +VS SUPPLY VOLTAGE, VCC POWER DISSIPATION, internal1 TEMPERATURE, pin solder - 10s TEMPERATURE, junction2 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case INPUT VOLTAGE, +PWM INPUT VOLTAGE, ILIM TESTCONDITIONS2 IOUT 1mA IOUT 1mA MIN 4.8 0 0 3.7 44.10 TYP 450V 16V 250W 300C 150C -65 to +150C -55 to +125C 0 TO +11V 0 TO +10V MAX 5.3 .4 .9 5.4 46.90 UNITS V V V V kHz V V V V 5.4 22.05 20 28 165 14 98 22.50 22.95 V % kHz A A V V mA mA mA mV nA C/W C/W C
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER CLOCK(CLK) CLK OUT, high level4 CLK OUT, low level4 CLK IN, low level4 CLK IN, high level4 FREQUENCY ANALOG INPUT (+PWM) center voltage P-P voltage FLAG FLAG, high level FLAG, low level OUTPUT TOTAL DROP EFFICIENCY, 20A output SWITCHING FREQUENCY CURRENT, continuous4 CURRENT, peak4 POWERSUPPLY 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
45.00 5 4 10 0
0/100% modulation
I = 20A VS = 380V OSC in / 2 100C case
Full temperature range Full temperature range IOUT = 0 No Load
240 15
450 16 80 50 90 110 100 1
90
Full temperature range, for each die Full temperature range Meets full range specifications
12 -25 +85
NOTES: 1. Each of the two active output transistors can dissipate 125W. 2. Unless otherwise noted: TC = 25C, VS, VCC at typical specification. 3. 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. 4. Guaranteed but not tested. 5. If 100% duty cycle is not required VS(MIN) = 0V.
CAUTION
The SA08 is constructed from static sensitive components. 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.
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
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SA08
TYPICAL PERFORMANCE GRAPHS
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
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OPERATING CONSIDERATIONS
SA08
adjusted so as to reduce the switching noise well below 100 mV to prevent false current limiting. The sum of the DC level plus the noise peak will determine the current limiting value. As in most switching circuits it may be difficult to determine the true noise amplitude without 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 = .1uF, RFILTER = 5k . 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.
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.apexmicrotech.com for design tools that help automate pwm filter design; heat sink selection; Apex's complete Application Notes library; Technical Seminar Workbook; and Evaluation Kits.
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. An external clock signal can be applied to the CLK IN pin for synchronization purposes, but must be 45 kHz +/- 2%.
FLAG OUTPUT
Whenever the SA08 has detected a fault condition, the flag output is set high (10V). When the programmable low side current limit is exceeded, the FLAG output will be set high. The FLAG output will be reset low on the next clock cycle. This reflects the pulse-by-pulse current limiting feature. When the internally-set high side current limit is tripped or the thermal limit is reached, the FLAG output is latched high. See PROTECTION CIRCUITS below.
PROTECTION CIRCUITS
A fixed internal current limit senses the high side current. Should either of the outputs be shorted to ground the high side current limit will latch off the output transistors. The temperature of the output transistors is also monitored. Should a fault condition raise the temperature of the output transistors to 165C the thermal protection circuit latch off the output transistors. The latched condition can be cleared by either recycling the Vcc power or by toggling the I LIMIT/SHDN input with a 10V pulse. See Figures A and B. The outputs will remain off as long as the shutdown pulse is high (10V).
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 RLIMIT resistors (through the filter network and shutdown divider resistor) and connect the RLIMIT resistors directly to the GND pin. Switching noise spikes will invariably be found at the I SENSE pins. The noise spikes could trip the current limit threshold which is only 100 mV. RFILTER and CFILTER should be
STARTUP CONDITIONS
The high side of the IGBT 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 SA08 at startup is demanding a 100% duty cycle, the output may not follow the command and may be in a tri-state 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, SHANNON ROAD * is assumed ARIZONA 85741 * USA * APPLICATIONS are subject 1 (800) 546-2739 APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH however, no responsibility TUCSON, for possible inaccuracies or omissions. All specificationsHOTLINE: to change without notice.
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SA08U REV E OCTOBER 2006 (c) 2006 Apex Microtechnology Corp.

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