Page 1
ISO 9001 CERTIFIED BY DSCC
75 VOLT 8 AMP MOSFET
H-BRIDGE PWM MOTOR
4221
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751
FEATURES:
Low Cost Complete H-Bridge
8 Amp Capability, 75 Volt Maximum Rating
Self-contained Smart Lowside/Highside Drive Circuitry
Shoot-through Protection
Isolated Case Allows Direct Heatsinking
Four Quadrant Operation, Torque Control Capability
Logic Level Disable Input
Logic Level High Side Enable Input for Special Modulation or Function
Internal Divider Reference for Threshold Voltage
DESCRIPTION:
The MSK 4221 is a complete H-Bridge circuit to be used for DC brushed motor control or Class D switchmode
amplifiers. All of the drive/control circuitry for the lowside and highside switches are included internally. The user
provides a digitally compatible PWM signal (a reference divider is provided for TTL compatability or the user provides
their own to the VREF IN) for simultaneous amplitude and direction control in four quadrant mode. The internal drive
circuitry will provide proper deadtime/shoot-through protection for each half-bridge. All N-channel FETs mean the
best efficiency for the size, both in terms of on-resistance and switching capability. For an idle/sleep mode or for fault
protection, a TTL compatible disable pin is provided so as to shut down all four transistors. The MSK4221 is
constructed on a space efficient ceramic coated insulated metal substrate that can be directly connected to a heat
sink.
EQUIVALENT SCHEMATIC
DRIVER/AMPLIFIER
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
18
17
16
15
14
13
12
11
10
Output B
Output B
Rsense B
Rsense B
V+
V+
Rsense A
Rsense A
Output A
Rev. C 6/00
HEN
1
Disable
2
Input
3
Vref in
4
Ground
5
Ground
6
Vref out
7
Vcc
8
Output A
9
1
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ABSOLUTE MAXIMUM RATINGS
High Voltage Supply
V+
Logic Supply
VCC
Continuous Output Current
IOUT
Peak Output Current
IPK
Output Voltage Range
VOUT
Thermal Resistance
θJC
○○○○○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○○
○○○○○○○○○○○○○○○○
○○
○○○○○○○○○○○○○○
(Output Switches)
ELECTRICAL SPECIFICATIONS
Parameter
OUTPUT CHARACTERISTICS
VDS(ON) Voltage
Instantaneous Forward Voltage
Reverse Recovery Time
Leakage Current
Vref Output
Vcc SUPPLY CHARACTERISTICS
Quiescent Bias Current
Vcc Voltage Range
INPUT SIGNAL CHARACTERISTICS
VREF Input Current - Low
VREF Input Current - High
Input Current - Low
Input Current - High
PWM Pulse Low Voltage
PWM Pulse High Voltage
PWM Frequency
LOGIC CONTROL INPUTS
Disable Input
HEN Input
SWITCHING CHARACTERISTICS
Rise-Time
Fall-Time
Dead-Time
1
1
1
1
1
1
1
75V
16V
○○○○○○○○○○○○○
8A
14A
GND-2V min. To V+ max.
5.3°C/W
Test Conditions
Each MOSFET ID=10A
Each MOSFET IS=10A Intrinsic Diode
Intrinsic Diode
Each MOSFET V+=70V
IVREF=0mA
Input=0VDC
1
Vref Out Connected to Vref In
Vref Out Connected to Vref In
Input Voltage LO
Input Voltage HI
Input Current (DISABLE=0V)
Input Voltage LO
Input Voltage HI
Input Current (HEN=0V)
Storage Temperature Range
TST
Lead Temperature Range
TLD
○○
-65°C to +150°C
○○○○○○○○○○○
300°C
(10 Seconds)
Case Operating Temperature
TC
MSK4221
Junction Temperature
TJ
○○○○○○○○○○○○
○○○○○○○○○○○
-25°C to +125°C
+150°C
All Ratings: Tc= +25°C Unless Otherwise Specified
-
-
-
-
-
9
-2
-
-2
-
0
-
-
-
-
-
-
-
-
MSK 4221
Typ.
1.7
2.0
-
1.0
1.2
20
12
-
-
-
-
-
-
45
-
-
-
-
-
-
140
680
100
Max.
2.5
2.5
280
25
1.23
25
16
-
2
-
2
0.8
5.0
250
0.8
-
-135
0.8
-
-270
200
1000
-
Units
V
V
nS
uA
V
mA
V
uA
uA
uA
uA
V
V
KHz
V
V
uA
V
V
uA
nS
nS
nS
2
3
3
Min.
1.16
2.7
2.7
2.7
NOTES:
1
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
2
Vcc=+12V and VREF Out connected to VREF IN unless otherwise specified.
3
Measure using a 300µS pulse with a 2% Duty Cycle.
2
Rev. C 6/00
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APPLICATION NOTES
MSK 4221 PIN DESCRIPTIONS
VCC - Is the low voltage supply for powering internal
logic and drivers for the lowside and highside MOSFETS.
The supplies for the highside drivers are derived from
this voltage.
V+ - Is the higher voltage H-bridge supply. The
MOSFETS obtain the drive current from this supply pin.
The voltage on this pin is limited by the drive IC. The
MOSFETS are rated at 100 volts. Proper by-passing to
GND with sufficient capacitance to suppress any volt-
age transients, and to ensure removing any drooping
during switching, should be done as close to the pins
on the module as possible.
OUTPUT A - Is the output pin for one half of the bridge.
Increasing the duty cycle of the input causes increas-
ing duty cycles at this output.
OUTPUT B - Is the output pin for the other half of the
bridge. Decreasing the duty cycle of the input causes
increasing duty cycles at this output.
VREF OUT - Is a pin providing a resistor divider net-
work dividing Vcc voltage down to be used as a de-
fault reference level input for the INPUT signal thresh-
old. It is set up primarily to be used as a TTL threshold.
To use, just connect VREF OUT to VREF IN. VREF
OUT is bypassed internally with a capacitor.
VREF IN - Is a pin provided to allow the user to tailor
the INPUT threshold to their particular logic level re-
quirements. In a default configuration, VREF IN gets
connected to VREF OUT for TTL threshold level require-
ments.
TYPICAL SYSTEM OPERATION
RSENSE A - Is the connection for the bottom of the A
half bridge. This can have a sense resistor connection
to the V+ return ground for current limit sensing, or
can be connected directly to ground. The maximum
voltage on this pin is ±2 volts with respect to GND.
RSENSE B - Is the connection for the bottom of the B
half bridge. This can have a sense resistor connection
to the V+ return ground for current limit sensing, or
can be connected directly to ground. The maximum
voltage on this pin is ±2 volts with respect to GND.
GND - Is the return connection for the input logic and
Vcc.
INPUT - Is digital input for controlling the PWM pulse
width of the bridge. A duty cycle higher than 50% will
produce greater than 50% duty cycle pulses out of
OUTPUT A. A duty cycle lower than 50% will produce
greater than 50% duty cycle pulses out of OUTPUT B.
DISABLE - Is the connection for disabling all 4 output
switches. DISABLE high overrides all other inputs.
When taken low, everything functions normally. An
internal pullup to Vcc will keep DISABLE high if left
unconnected.
HEN - Is the connection for enabling the high side out-
put switches. When taken low, HEN overrides other
inputs and the high side switches remain off. When
HEN is high everything functions normally. An internal
pullup to Vcc will keep HEN high if left unconnected.
IN
This is a diagram of a typical application of the MSK 4221.
The design Vcc voltage is +12 volts and should have a good
low ESR bypass capacitor such as a tantalum electrolytic.
The input will be a pulse width modulated digital signal from
a microcontroller, DSP or other microprocessor. A 50% duty
cycle input will cause zero average current through the load.
A smaller duty cycle input will cause increasing average cur-
rent in one direction, a larger duty cycle input will cause in-
creasing average current in the other direction. The gain of
the current control amplifier will have to be set to obtain the
proper amount of current limiting required by the system.
Current sensing is done in this case by a 0.1 ohm sense
resistor to sense current from the common source of the
bridge together. It is important to make the high current
traces as big as possible to keep inductance down. The stor-
age capacitor connected to the V+ and the module should
be large enough to provide the high energy pulse without the
voltage sagging too far. A low ESR ceramic capacitor or
large polypropylene capacitor will be required. Mount the
capacitor as close to the module as possible. The connection
between GND and the V+ return should not be carrying any
motor current. The sense resistor signal is common mode
filtered as necessary to feed the limiting circuitry for the mi-
croprocessor. This application will allow full four quadrant
torque control for a closed loop servo system.
A snubber network is usually required, due to the induc-
tance in the power loop. It is important to design the snub-
ber network to suppress any positive spikes above 75V and
negative spikes below -2V with respect to ground.
3
Rev. C 6/00
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TYPICAL PERFORMANCE CURVES
4
Rev. C 6/00
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MECHANICAL SPECIFICATIONS
ESD Triangle Indicates Pin 1.
TORQUE SPECIFICATION: 3 TO 5 IN/LBS.
NOTE: ALL DIMENSIONS ARE ±0.010 UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
Part
Number
MSK4221
M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
Screening Level
Industrial
The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make
changes to its products or specifications without notice, however, and assumes no liability for the use of its products.
5 Rev. C 6/00
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