APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
1
FEATURES
WIDE SUPPLY RANGE--16-100V
30A CONTINUOUS TO 60C case
3 PROTECTION CIRCUITS
ANALOG OR DIGITAL INPUTS
SYNCHRONIZED OR EXTERNAL OSCILLATOR
FLEXIBLE FREQUENCY CONTROL
APPLICATIONS
MOTORS TO 4HP
REACTIVE LOADS
LOW FREQUENCY SONAR
LARGE PIEZO ELEMENTS
OFF-LINE DRIVERS
C-D WELD CONTROLLER
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 giv-
ing 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 12-pin hermetic MO-127 power package occupies
only 3 square inches of board space.
BLOCK DIAGRAM AND TYPICAL APPLICATION
EXTERNAL CONNECTIONS
12-PIN POWER DIP
PACKAGE STYLE CR
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
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ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SA03
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
100V
SUPPLY VOLTAGE, V
CC
16V
POWER DISSIPATION, internal
300W
TEMPERATURE, pin solder - 10s
300C
TEMPERATURE, junction
2
150C
TEMPERATURE, storage
65 to +150C
OPERATING TEMPERATURE RANGE, case
55 to +125C
INPUT VOLTAGE, +PWM
0 to +11V
INPUT VOLTAGE, PWM
0 to +11V
INPUT VOLTAGE, I
LIM
0 to +10V
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
NOTES: 1.
Each of the two active output transistors can dissipate 150W.
2.
Unless otherwise noted: T
C
= 25C, V
S
, V
CC
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 V
S(MIN)
= 0V.
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
2
MIN
TYP
MAX
UNITS
CLOCK (CLK)
CLK OUT, high level
4
I
OUT
1mA
4.8
5.3
V
CLK OUT, low level
4
I
OUT
1mA
0
.4
V
FREQUENCY
44
45
46
kHz
RAMP, center voltage
5
V
RAMP, P-P voltage
4
V
CLK IN, low level
4
0
.9
V
CLK IN, high level
4
3.7
5.4
V
OUTPUT
TOTAL R
ON
.16
EFFICIENCY, 10A output
V
S
= 100V
97
%
SWITCHING FREQUENCY
OSC in 2
22
22.5
23
kHz
CURRENT, continuous
4
60C case
30
A
CURRENT, peak
4
40
A
POWER SUPPLY
VOLTAGE, V
S
Full temperature range
16
5
60
100
V
VOLTAGE, V
CC
Full temperature range
14
15
16
V
CURRENT, V
CC
I
OUT
= 0
80
mA
CURRENT, V
CC,
shutdown
50
mA
CURRENT, V
S
No Load
50
mA
I
LIM
/SHUTDOWN
TRIP POINT
90
110
mV
INPUT CURRENT
100
nA
THERMAL
3
RESISTANCE, junction to case
Full temperature range, for each die
.83
C/W
RESISTANCE, junction to air
Full temperature range
12
C/W
TEMPERATURE RANGE, case
Meets full range specifications
25
+85
C
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
4
spikes will invariably be found
at the I SENSE pins. The noise
spikes could trip the current limit
threshold which is only 100 mV.
R
FILTER
and C
FILTER
should be ad-
justed so as to reduce the switch-
ing noise well below 100 mV to
prevent false current limiting.
The sum of the
DC level plus
the noise peak
will determine
the current limit-
ing 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 con-
nect exactly at the GND terminal of the amplifier. Suggested
starting values are C
FILTER
= .01uF, R
FILTER
= 5k .
The required value of R
LIMIT
in voltage mode may be cal-
culated by:
R
LIMIT
= .1 V / I
LIMIT
where R
LIMIT
is the required resistor value, and I
LIMIT
is the
maximum desired current. In current mode the required value
of each R
LIMIT
is 2 times this value since the sense voltage is
divided down by 2 (see Figure B). If R
SHDN
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 out-
puts. 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.
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 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.
OPERATING
CONSIDERATIONS
SA03
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 Work-
book; and Evaluation Kits.
CLOCK CIRCUIT AND RAMP GENERATOR
The clock frequency is internally set to a frequency of ap-
proximately 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 V
CC
to restart
the circuit.
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 con-
nection (see figures A and B). It is recommended that R
LIMIT
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
(through the filter net-
work and shutdown
divider resistor) and
connect the R
LIMIT
resistors directly to
the GND pin.
Switching noise
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. F MARCH 2001 2001 Apex Microtechnology Corp.
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