MSK4225 - M.S. Kennedy Corp.

MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
75 VOLT 20 AMP MOSFET
H-BRIDGE PWM MOTOR
DRIVER/AMPLIFIER
4225
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
• Low RDS(ON) 0.013Ω Typical
• Low Cost, Non-Hermetic, Complete H-Bridge
•20 Amp Capability, 75 Volt Maximum Rating
• Self-contained Smart Lowside/Highside Drive Circuitry
• Internal 45KHz PWM Generation, Shoot-through Protection
• Isolated Case Allows Direct Heatsinking
• Logic Level Disable Input
• Logic Level High Side Enable Input for Special Modulation or Function
DESCRIPTION:
The MSK 4225 is a complete H-Bridge circuit to be used for DC brushed motor control or Class D switchmode amplification. All of the drive/control circuitry for the lowside and highside switches are internal to the circuit. The 45KHz PWM
circuitry is internal as well, leaving the user to only provide an analog signal for the motor speed/direction, or audio signal for
switchmode audio amplification. The MSK 4225 is constructed in a space efficient plastic power package that can be
directly bolted to a heatsink.
EQUIVALENT SCHEMATIC
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
1
2
3
4
5
6
7
8
9
10
1
NC
VCC
HEN
DIS
NC
INPUT
NC
GND
GND
NC
20
19
18
17
16
15
14
13
12
11
RSENSE A
RSENSE A
OUTPUT A
OUTPUT A
V+
V+
OUTPUT B
OUTPUT B
RSENSE B
RSENSE B
Rev. F 1/11
5
ABSOLUTE MAXIMUM RATINGS
V+
VCC
IOUT
IPK
VOUT
θJC
High Voltage Supply 6
75V
Logic Supply
16V
Continuous Output Current
20A
Peak Output Current
40A
Output Voltage Range
GND -2V min. to V + max.
Thermal Resistance
3.0°C/W
(Output Switches @ 125°C)
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
TST Storage Temperature Range
TLD Lead Temperature Range
(10 Seconds)
TC Case Operating Temperature
MSK4225
TJ Junction Temperature
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
ELECTRICAL SPECIFICATIONS
Parameter
○
○
○
○
○
○
-55°C to +125°C
300°C
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
-40°C to +85°C
+150°C
○
○
○
○
○
Tc= +25°C Unless Otherwise Specified
Test Conditions
MSK 4225
2
Units
Min.
Typ.
Max.
-
-
0.013
Ω
-
0.45
0.52
V
-
1.0
1.3
V
Intrinsic Diode
-
-
280
nS
Each MOSFET V+=70V
-
10
250
uA
40
45
50
KHz
-
43
50
mA
10
12
15
V
OUTPUT CHARACTERISTICS
RDS (ON) 1 4
Each MOSFET ID=20A
VDS(ON) Voltage
Each MOSFET ID=20A
Instantaneous Forward Voltage
Reverse Recovery Time
3
Each MOSFET IS=20A Intrinsic Diode
1
Leakage Current
PWM Frequency
VCC
3
SUPPLY CHARACTERISTICS
Quiescent Bias Current
VCC Voltage Range
Analog Input=6VDC
1
INPUT SIGNAL CHARACTERISTICS
1
Analog Input Voltage
Output A,B=50% Duty Cycle
-
6
-
V
Analog Input Voltage
Output A=100% Duty Cycle High
-
9
-
V
Analog Input Voltage
Output B=100% Duty Cycle High
-
3
-
V
Input Voltage LO
-
-
0.8
V
Input Voltage HI
2.7
-
-
V
Input Current (DISABLE=0V)
-
-
135
uA
Input Voltage LO
-
-
0.8
V
Input Voltage HI
2.7
-
-
V
Input Current (HEN=0V)
-
-
270
uA
LOGIC CONTROL INPUTS
1
Disable Input
HEN Input
SWITCHING CHARACTERISTICS
1
RL=100Ω
Rise Time
-
40
-
nS
Fall Time
-
30
-
nS
Dead Time
-
45
-
nS
NOTES:
1
2
3
4
5
6
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
VCC=+12V, V+=28V, RSENSE A,B=Ground, DIS=0V, HEN=N/C unless otherwise specified.
Measured using a 300μS pulse with a 2% Duty Cycle.
On Resistance is specified for the Internal MOSFET for Thermal Calculations. It does not include the package pin resistance.
Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
When applying power to the device, apply the low voltage followed by the high voltage or alternatively, apply both at the same time. Do not apply high
voltage without low voltage present.
2
Rev. F 1/11
APPLICATION NOTES
TYPICAL SYSTEM OPERATION
MSK 4225 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
75 volts. Proper by-passing to GND with sufficient capacitance to suppress any voltage transients, and to ensure removing any drooping during switching, should be done as
close to the pins of the module as possible.
OUTPUT A - Is the output pin for one half of the bridge. Decreasing the input voltage causes increasing duty cycles at
this output.
OUTPUT B - Is the output pin for the other half of the bridge.
Increasing the input voltage causes increasing duty cycles at
this output.
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 an analog input for controlling the PWM pulse
width of the bridge. A voltage lower than VCC/2 will produce
greater than 50% duty cycle pulses out of OUTPUT A. A
voltage higher than VCC/2 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 output
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.
This is a diagram of a typical application of the MSK4225. The
design VCC voltage is +12 volts and should have a good low ESR
bypass capacitor such as a tantalum electrolytic. The analog input
can be an analog speed control voltage from a potentiometer, other
analog circuitry or by microprocessor and a D/A converter. This
analog input gets pulled by the current control circuitry in the proper
direction to reduce the current flow in the bridge if it gets too high.
The gain of the current control amplifier will have to be set to
obtain the proper amount of current limiting required by the system.
IN
Current sensing is done in this case by a 0.1 ohm sense resistor to sense current from both legs of the bridge separately. It is
important to make the high current traces as big as possible to keep
inductance down. The storage 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 microprocessor. This
application will allow full four quadrant torque control for a closed
loop servo system.
A snubber network is usually required, due to the inductance in
the power loop. It is important to design the snubber network to
suppress any positive spikes above 70V and negative spikes below -2V with respect to ground.
*There are certain inductive load situations that can possibly cause
a momentary shoot-through or cross-conduction condition in the
MSK4225. This shoot-through is approximately 100nSec long
and can be several amps, depending on the layout and impedence
of the bypassing circuit. Most bypassing and current sensing filtering will usually eliminate the effects. However, in the case where it
is still present, or the sense resistor trace lengths are long, reversebiased ultra-fast recovery diodes or power schottky diodes from
RSENSE A and RSENSE B to power ground will minimize or eliminate the situation.
3
Rev. F 1/11
TYPICAL PERFORMANCE CURVES
4
Rev. F 1/11
MECHANICAL SPECIFICATIONS
MOUNTING TORQUE: 3-4 INCH POUNDS
WEIGHT= 36.9 GRAMS TYPICAL
ESD Triangle Indicates Pin 1.
NOTE: ALL DIMENSIONS ARE ±0.010 UNLESS OTHERWISE LABELED.
CAUTION: THIS IS A NON-HERMETIC DEVICE. DO NOT EXPOSE PLASTIC HOUSING TO LIQUID
ORDERING INFORMATION
Part
Number
Screening
Level
MSK4225S
Industrial
Straight
MSK4225D
Industrial
Down
MSK4225U
Industrial
Up
MSK4225G
Industrial
Gull Wing
Lead
Configuration
M.S. Kennedy Corp.
4704 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751
FAX (315) 701-6752
www.mskennedy.com
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.
Please visit our website for the most recent revision of this datasheet.
5
Rev. F 1/11