MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
FEATURES:
100 VOLT 20 AMP
H-BRIDGE PWM MOTOR
DRIVER/AMPLIFIER
4206
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
Replaces APEX SA01 PWM Amplifier
100 Volt, 20 Amp Capability
Self-Contained Smart Lowside/Highside Drive Circuitry
Internal PWM Generation, Shoot-through Protection
Isolated Case Allows Direct Heatsinking
Available Fully Screened To MIL-PRF-38534 Class H
Contact MSK for MIL-PRF-38534 Qualification Status
DESCRIPTION:
The MSK 4206 is a complete H-Bridge microcircuit intended for use in DC brushed motor control applications or Class
D switchmode amplification in severe operating conditions. All of the control circuitry, including an error amplifier, is
internal to the device. A precision reference output is provided for use in offsetting the error amplifier. Fixed highside
current limit is provided internally. Lowside current limit is user controlled with the use of an external resistor network. The
design is packaged in a 10 pin bolt down power package.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
MOTOR CONTROL
REACTIVE LOADS
PIEZO ELEMENTS
PIN-OUT INFORMATION
1
2
3
4
5
1
- IN
+IN
EA OUT
GND
REF
6
7
8
9
10
A OUT
+VS
ISENSE
B OUT
SHDN/FILTER
Rev. B 2/10
ABSOLUTE MAXIMUM RATINGS
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8
-55°C to +125°C
-40°C to +85°C
+150°C
1.25°C/W
1.0°C/W
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NOTES:
1
2
3
4
5
6
7
8
+Vs=28V, I SENSE= Ground, SHDN/FILTER= 0V unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Class H devices are 100% tested to subgroups 1,2,3,4, and 7. Subgroup 5 and 6 testing available upon request.
Subgroup 1,4,7
TA=TC= +25°C
2,5
TA=TC= +125°C
3,6
TA=TC= -55°C
Industrial grade and "E" suffix devices shall be 100% tested at 25°C only.
Tested with a low duty cycle pulse to minimize junction heating.
The typical internal reading is for the die only. This should be used for thermal calculations only.
Continuous operation at or above the maximum ratings may adversely effect the device performance and/or life cycle.
2
Rev. B 2/10
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ELECTRICAL SPECIFICATIONS
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+VS
I
OUT
I
PK
V
OUT
V
IN
V
L
High Voltage Supply
Continuous Output Current
Peak Output Current
Output Voltage Range
Input Voltage, +IN and -IN
Logic Input Voltage (SHDN/FILTER)
100V
20A
30A
GND to +Vs
0V to 12V
0V to 10V
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T
ST
Storage Temperature Range
T
LD
Lead Temperature Range
(10 Seconds)
T
C
Case Operating Temperature Range
MSK4206H/E
MSK4206
T
J
Junction Temperature
θJc
Thermal Resistance
(Output FETS @ 125°C)
(Output FETS @ 25°C)
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-65°C to +150°C
300°C
APPLICATION NOTES
MSK 4206 PIN DESCRIPTION
+Vs
- Is the voltage supply for powering internal logic and drivers as well as H-bridge supply pin. The MOSFETS obtain the
drive current from this supply pin. The MOSFETs are rated at 100 volts. Proper bypassing to GND with sufficient capaci-
tance to suppress any voltage transients, and ensure removal of any drooping during switching, should be done as close to
the pin on the hybrid as possible.
AOUT
- Is the output pin for one half of the bridge. As EA OUT goes more positive the duty cycles increases at this output.
BOUT
- Is the output pin for one half of the bridge. As EA OUT goes more positive the duty cycles decreases at this output.
ISENSE
- Is the connection for the bottom of the half bridge. This can have a sense resistor connection to the +Vs return
ground for current limit sensing, or can be connected directly to ground. The maximum voltage on this pin is ±5V with
respect to GND.
GND
- Is the return connection for +Vs.
+IN -
Is the non-inverting input to the internal error amplifier. This pin requires a level between 2 and 8V for proper
operation.
-IN
- Is the inverting input to the internal error amplifier.
EA OUT
- Is the output of the internal error amplifier. The error amplifier output is connected internally to the PWM. An
error amp output voltage higher than 5V will produce greater than 50% duty cycle pulses out of A OUT. An error amp
voltage lower than 5V will produce greater than 50% duty cycle pulses out of B OUT.
REF
- Is the output of the internal precision reference. The internal reference will provide 7.5V with load current up to 5mA.
SHDN/FILTER
- Is the connection for disabling all 4 output switches. SHUTDOWN high overrides all other inputs. When
taken low, everything functions normally. This pin should be grounded if not used.
3
Rev. B 2/10
APPLICATION NOTES CONT'D
CURRENT LIMIT
The current limit function sets the peak limit on current flow in pin 8. This circuit can trip at anytime during the conduction
period and will hold the output transistors off for the remainder of that conduction period. It is recommended that RLIMIT
resistor be non-inductive. Load current flows in the ISENSE pin. To avoid errors due to lead length connect the SHDN/FILTER
pin directly to the RLIMIT resistor (through the filter network and shutdown divider resistor) and connect the RLIMIT
resistor directly to the +VS return. Switching noise spikes will invariably be found at the ISENSE pin. The noise spikes could
trip the current limit threshold which is only 200mV. RFILTER and CFILTER should be adjusted so as to reduce the switching
noise well below 200mV 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 pin of the amplifier. Suggested starting values are CFILTER=0.01µF, RFILTER=5K. The required value of RLIMIT
in voltage mode may be calculated by:
RLIMIT=0.2V/ILIMIT where RLIMIT is the required resistor value and ILIMIT is the maximum desired current. 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.
FIGURE 1
ERROR AMPLIFIER
The internal amplifier can be used to integrate the difference between command signals and feedback signals. For highest
loop accurancy it is best to configure the error amplifier as an integrator. Poles and zeros must be selected to provide circuit
stability while maximizing system respones. Specific component values will vary from system to system. The 7.5V refer-
ence output can be used to bias the non-inverting input of the error amplifier to the middle of its 2 to 8V common mode
voltage range. (See typical application circuit).
PROTECTION CIRCUITS
In addition to the externally programmable current limit there is also a fixed internal current limit which senses only the
highside current. The DC trip level is approximately 35A. Should either of the outputs be shorted to ground the highside
current limit will latch off the output transistors. It will be necessary to remove the fault condition and recycle power to
+VS to restart the circuit.
4
Rev. B 2/10
TYPICAL APPLICATION CIRCUIT
MOTOR DRIVER WITH TACH FEEDBACK
MmkdkoadIT
5
Rev. A 2/10
