APEX SA01

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FEATURES
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SINGLE SUPPLY OPERATION
WIDE SUPPLY RANGE — 16-100V
20A CONTINUOUS OUTPUT
PROGRAMMABLE CURRENT LIMIT
SHUTDOWN CONTROL
HERMETIC PACKAGE
2 IN2 FOOTPRINT
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APPLICATIONS
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10-PIN POWER DIP
PACKAGE STYLE DE
BRUSH TYPE MOTOR CONTROL
PELTIER CONTROL
REACTIVE LOADS
MAGNETIC COILS (MRI)
ACTIVE MAGNETIC BEARING
VIBRATION CANCELLING
TYPICAL APPLICATION
DESCRIPTION
The SA01 amplifier is a pulse width modulation amplifier that
can supply 2KW to the load. The full bridge output amplifier
can be operated from a single power supply over a wide range
of voltages. An error amplifier is included which can provide
gain for the velocity control loop in brush type motor control
applications. Current limit is programmable by a single resistor.
A shutdown input turns off all four drivers of the H bridge output.
A precision reference output is provided for use in offsetting
the error amplifier. The error amplifier can then be scaled for
standard input signals. The amplifier is protected from shorts to
supply or ground. The H bridge output MOSFETs are protected
from thermal overloads by directly sensing the temperature of
the die. The 10-pin hermetic power package occupies only 2
square inches of board space and is isolated.
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Motor Driver With Tach Feedback
BLOCK DIAGRAM
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EXTERNAL CONNECTIONS
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL prodli[email protected]
1
SA01
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS
OUTPUT CURRENT, peak
POWER DISSIPATION, internal
TEMPERATURE, pin solder - 10s
TEMPERATURE, junction2
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
SHUTDOWN VOLTAGE
REFERENCE LOAD CURRENT
ERROR AMP INPUT ±
SPECIFICATIONS
PARAMETER
TEST CONDITIONS2
ERROR AMP
OFFSET VOLTAGE
BIAS CURRENT
OFFSET CURRENT
COMMON MODE VOLTAGE RANGE4
COMMON MODE REJECTION, DC4
SLEW RATE
OPEN LOOP GAIN4
GAIN BANDWIDTH PRODUCT
OUTPUT
TOTAL RON
EFFICIENCY, 10A OUTPUT
SWITCHING FREQUENCY
CURRENT, continuous4
CURRENT, peak4
REFERENCE
VOLTAGE
VOLTAGE VS. TEMP4
OUTPUT CURRENT
LOAD REGULATION4
LINE REGULATION
POWER SUPPLY
VOLTAGE
CURRENT
CURRENT, shutdown
4.
CAUTION
MAX
UNITS
10
5
1
+8
mV
µA
µA
V
dB
V/µS
dB
MHz
15
75
2
VS = 100V
IREF = 5mA
Full temperature range
35.3
20
30
7.46
.25
97
42
7.50
20
1
Full temperature range
IOUT = 0, IREF = 0
IREF = 0
16
50
76
.18
THERMAL2
RESISTANCE, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
2.
3.
TYP
+2
75
SHUTDOWN
TRIP POINT
INPUT CURRENT
NOTES: 1.
MIN
100V
30A
185W1
300°C
150°C
–65 to +150°C
–55 to +125°C
10V
10mA
0 to +12V
Full temp range, for each transistor
Full temperature range
Meets full range specifications
48.7
7.54
50
5
50
V
PPM/°C
mA
PPM/mA
PPM/V
100
90
25
V
mA
mA
.22
100
V
nA
1.0
°C/W
°C/W
°C
12
–25
Ω
%
KHz
A
A
+85
Each of the two active output transistors can dissipate 125W, however the N-channel will be about 1/3 of the total dissipated
power. Internal connection resistance is .05Ω.
Unless otherwise noted: TC = 25°C.
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.
The SA01 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 850°C to avoid generating toxic fumes.
APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739
2
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TYPICAL PERFORMANCE
GRAPHS
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SA01
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APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected]
3
OPERATING
CONSIDERATIONS
SA01
GENERAL
the shutdown signal is high the output will be disabled.
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.
PROTECTION CIRCUITS
CURRENT LIMIT
The current limit function sets a peak limit on current flow in
pin 8 (Isense). This limits load current and also limits current in
the event of a short of either output to +Vs. This circuit can trip
anytime during the conduction period and will hold the output
transistors off for the remainder of that conduction period.
For proper operation the current limit sense resistor must
be connected as shown in the external connection diagram.
It is recommended that the resistor be a non-inductive type.
Load current flows in pin 8. No current flows in pin 10 (Shutdown/filter) so no error will be introduced by the length of
the connection to pin 10. However, the voltage at pin 10 is
compared to GND (pin 4) and an error could be introduced if
the grounded end of RLIMIT is not directly tied to pin 4. Good
circuit board layout practice would be to connect RLIMIT directly
between pins 8 and 4.
Switching noise spikes will invariably be found at pin 8. The
amplitude and duration will be load dependent. The noise
spikes could trip the current limit threshold which is only 200
mV. RFILTER and CFILTER should be adjusted so as to reduce the
switching noise well below 200 mV to prevent false current
limiting. The sum of the DC level plus the noise peak will determine the current limiting value. Suggested starting values
are CFILTER = .01µF, RFILTER = 5k.
The required value of RLIMIT may be calculated by:
RLIMIT = .2 V / ILIMIT
where RLIMIT is the required resistor value, and ILIMIT is the
maximum desired current.
There are two conditions which will latch all the output transistors off. The first of these conditions is activation of the high side
current limit. Specifically, current in pin 7 (+VS) is monitored.
The DC trip level is about 35A and response time about 5us.
As actual currents increase the response time decreases.
The external fault generally associated with this condition is
shorting one of the outputs to ground. However, a load fault
can also activate this high side current limit if the current rise
time is less than the response time of the filter discussed under
“Current Limit”. The second of these conditions is activation of
any of the four output transistor over-temperature sensors at
about 165°C. Ambient temperature, air flow, amplifier mounting
problems and all the previously mentioned high current faults
contribute to junction temperature. When either of these protection circuits are activated, the root fault must be corrected
and power cycled to restore normal operation.
DEAD TIME
There is a dead time between the on and off of each output. The dead time removes the possibility of a momentary
conduction path through the upper and lower transistors of
each half bridge output during the switching interval. During
the dead time all output transistors are off. Noise or flyback
may be observed at the outputs during this time due to the
high impedance of the outputs in the off state. This will vary
with the nature of the load.
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SHUTDOWN
The shutdown circuitry makes use of the internal current
limiting circuitry. The two functions may be externally combined
as shown below in Figure 1. RLIMIT will normally be a very low
value resistor and can be considered zero for this application.
RSD and RFILTER form a voltage divider for the shutdown signal.
After a suitable noise filter is designed for the current limit
adjust the value of RSD to give 317 mV of shutdown signal at
pin 10 when the shutdown signal is high. This means pin 10
will reach the 200 mV trip point in about one time constant with
low output current and
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less time as output current
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increases. The voltage at
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pin 10 is referenced to pin
4 (GND). CFILTER will filter
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both the current limit noise
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spikes and the shutdown
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signal. Shutdown and
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current limit operate on
each cycle of the internal
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switching rate. As long as
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ERROR AMPLIFIER
The internal error amplifier is an operational amplifier. For
highest loop accuracy it is best to configure the op amp as
an integrator (See Figure 2). Feedback can be adjusted with
appropriate poles and zeroes to properly compensate the
velocity loop for optimum stability.
The op amp is operated from a single supply voltage generated internally. The non-inverting input of the op amp does not
have a common mode range which includes ground. R2 and
R7 are used with the reference voltage provided at pin 5 to
bias the non-inverting input to +5 volts, which is approximately
half of the voltage supplied internally to the op amp. Similarly,
R1 and the parallel combination of R5 R6 are selected to bias
the inverting input also at +5 volts. Resistors R1 R2 must be
matched. Likewise the parallel combination of R5 R6 must
be matched with R7. The source impedances of the tach
and the signal source may affect the matching and should be
considered in the design.
This data
sheet has been carefullyCORPORATION
checked and is believed
to be NORTH
reliable, however,
no responsibility
is assumed for
possible inaccuracies
omissions.
All specifications HOTLINE:
are subject to1change
notice.
APEX
MICROTECHNOLOGY
• 5980
SHANNON
ROAD • TUCSON,
ARIZONA
85741 •orUSA
• APPLICATIONS
(800)without
546-2739
4
SA01U REV F SEPTEMBER 2002
© 2002 Apex Microtechnology Corp.