MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
M.S.KENNEDY CORP.
10 AMP, 70V, H-BRIDGE
MOSFET STEPPER
MOTOR DRIVE
4707 Dey Road Liverpool, N.Y. 13088
4230
(315) 701-6751
FEATURES:
70V Maximum Operating Motor Supply Voltage
100V Absolute Maximum Output Stage Rating
10Amp Continuous Output Switch Capability
Two Independent H Bridge MOSFET Output Stages Plus Gate Drivers
External High Side Capacitor Connections for Extended High Side Operation
Provisions for Bottom Side Current Sensing
Logic Level Bridge Shutdown
Under-Voltage Lockout will Protect MOSFETs from Insufficient Gate Voltage
Isolated Package Design for High Voltage Isolation Plus Good Thermal Transfer
Contact MSK for MIL-PRF-38534 Qualification Status
DESCRIPTION:
The MSK 4230 is a dual, independent MOSFET H Bridge with gate drivers for dual winding stepper motor drive
capability. It is constructed in a convenient isolated hermetic package. The logic input and bridge output have a common
return; the input is not electrically isolated from the output. Provisions for output stage isolation must be made externally.
Each high side drive has the capability of connecting external capacitance for extended high side ON time before refresh is
necessary. A common shutdown pin will disable both bridges upon activation. The bridge is capable of 10Amp continuous
current output with sufficient heat sinking, and is capable of 70V maximum operating supply voltage. The bridge is constructed with 100V absolute maximum voltage rated MOSFET to allow for de-rating to 70V. Any PWM scheme can be used
for any type of microstepping for both high torque and/or high speed motor operation. There is no simultaneous conductive
lockout, so provisions must be made externally for dead time. The MSK 4230 has good thermal conductivity for output
stage power dissipation due to the isolated package design that allows direct heat sinking of the device without insulators.
EQUIVALENT SCHEMATIC
1
8548-98 Rev. A 3/13
PIN-OUT INFORMATION
1
2
3
4
5
6
7
8
AVB+
AHI
ALO
AVBSD
BVB+
BHI
BLO
9 BVB10 +VCC
11 GND
12 CVB+
13 CHI
14 CLO
15 CVB16 DVB+
17
18
19
20
21
22
23
24
DHI
DLO
DVBDVDØ
DV+
CVCØ
25
26
27
28
29
30
31
32
CV+
NC
BVBØ
BV+
AVAØ
AV+
ABSOLUTE MAXIMUM RATINGS
A, B, C, DV+(VDD)
+VCC
IOUT
I PK
A, B, C, DHI; A, B, C, DLO, SD
RθJC
TST
TLD
6
High Voltage Supply 7
100V
Logic Supply
16V
Continuous Output Current
10A
Peak Output Current
16A
Logic Input Voltage
15V or +VCC whichever is lower
Thermal Resistance
(output switches, junction to case @ 125°C)
3.9°C/W
Storage Temperature Range
65°C to +150°C
Lead Temperature Range
(10 Seconds)
300°C
Case Operating Temperature
MSK4230
-40°C to +85°C
MSK4230H
-55°C to +125°C
Junction Temperature
+150°C
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ELECTRICAL SPECIFICATIONS
NOTES:
1
2
3
4
5
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
Industrial grade devices shall be tested to subgroup 1 and 4 unless otherwise specified.
Military grade devices ('H' suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroups 5 and 6 testing available upon request.
Subgroups 1,4 TA=TC=25°C
2,5 TA=TC=125°C
3,6 TA=TC=-55°C
6 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
7 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 the high voltage without the low voltage present.
2
8548-98 Rev. A 3/13
APPLICATION NOTES
AVB+, BVB+, CVB+, DVB+ - Are the pins for the positive
side of the external bootstrap capacitor. The sizing of this capacitor dictates how long the high side MOSFETs can stay on
before needing refresh or will turn off due to lack of voltage.
AV+, BV+, CV+, DV+ - Are the main output stage positive
power pins. Traces shall be designed for the required current. It
is very important to place proper bypass capacitors as close to
the V+ pins and either the V- or sense resistor return pins as
close to the module as possible. Good quality bulk capacitors of
at least 10uF per amp of required current, 1uF ceramic and a
good high frequency polyester or mylar capacitor of at least 3.3uF
shall be used. The poly or mylar capacitor will serve as a very
low ESR capacitor for the high frequency transients present from
switching the output stage, and help compensate for stray inductance in the power paths.
AVB-, BVB-, CVB-, DVB- - Are the pins for the negative side of
the external bootstrap capacitor.
VCC - Input power connection for the bias supply. A 22uF capacitor and a 0.1uF capacitor are recommended between this pin
and GND, as close to the module as possible.
GND - Return pin for the input bias supply power. The bypass
capacitors shall be connected to this pin as close to the module
as possible. An input ground plane is recommended, so as to
keep stray inductance down to a minimum. Since this is a nonisolated device between input power and output power, there
needs to be a connection between GND and the return of the
output stage power. The recommended two ground planes shall
connect together at one point, this GND pin, with a 0.100"
width trace of minimum length. This will minimize sharing ground
currents that will tend to move the input ground around and
pass transient noise to the input.
AV-, BV-, CV-, DV- - Are the main output stage positive power
return pins. Traces shall be designed for the required current. DC
link current sense resistor shall connect to this point, as close to
the module as possible for the least stray inductance. At a minimum, use a non-inductive resistor, and preferably the four wire
sense variety for the best sensing without the effect of voltage
drops due to current. If a sense resistor is not used, connect this
point to the power return with a minimum of trace inductance,
and terminate the power bypass capacitors at this point as close
to the module pins as possible. A wide output ground plane
section is recommended to connect up all of the power return
pins if current sense resistor are not used. If they are used, then
minimum trace length to the resistor, and then an output ground
plane section shall be used to collect all of the resistor negative
return points. All output bypass capacitors shall connect to this
ground plane as well.
AØ, BØ, CØ, DØ - Are the half bridge output pins. Traces shall
be designed for the required current.
AHI, BHI, CHI, DHI - Are the logic pins for controlling the high
side MOSFETs in each half bridge. They are asserted high, meaning a logic "1" will turn on the high side. These are CMOS logic
levels. There are no provisions for simultaneous conduction lockout or dead time, so high side and low side timing issues need to
be accommodated outside this module. For a logic "1" to maintain the high side MOSFET ON condition, sufficient voltage needs
to be stored on the VB capacitors. Because there are no high
side power supplies, the voltage to the VB capacitors are "bootstrap charged" to the VCC supply when the low side MOSFET is
turned ON. There is limited charge in these capacitors , and the
charge will be depleted as the high side stays ON for extended
amounts of time. For extended high side ON conditions, use
larger VB capacitors.
ALO, BLO, CLO, DLO - Are the logic pins for controlling the low
side MOSFETs in each half bridge. They are asserted high, meaning a logic "1" will turn on the low side. These are CMOS logic
levels. There are no provisions for simultaneous conduction lockout or dead time, so low side and high side timing issues need to
be accommodated outside this module.
SD - Is the pin for shutting down the complete module. It is logic
level, with a logic "1" disabling all of the half bridges. The input
is CMOS.
3
8548-98 Rev. A 3/13
TYPICAL APPLICATION CIRCUIT
4
8548-98 Rev. A 3/13
TYPICAL APPLICATION LAYOUT
Shown is a typical application with the output stage PC board layout using sense resistors for the 4 half bridge legs. There are
2 planes, one for the V+ power input, and one for the Ground return. They are to be on separate layers. The typical placement of
the 2 types of capacitors are also shown. V+ power and Ground return should connect to the same end of the PC board assembly,
such that output currents between the V+ and the Ground will cancel if they are flowing in the opposite direction, minimizing
inductance.
The 2 planes shall be as wide as possible to minimize stray inductance. With the 2 types of capacitors split with the module in the
middle, it tends to again minimize stray inductance between it and the capacitances. It may be desirable to split both the bulk
capacitance and the poly capacitance and place one of each on each end of the module to further spread the capacitance out and
minimize the effect of stray inductance.
With the sense resistors and their connections shown, it is important to minimize trace length and keep the widths as wide as
possible for inductance reasons. The sense resistors shall be non-inductive, and have heatsinking appropriate to the value of
resistor selected. The sense traces do not carry significant current, so they can be routed back to the sensing and amplification
circuitry elsewhere. It is important to keep the sense and return traces for each resistor routed in close proximity to minimize noise
pickup and capitalize on the common mode rejection of a typical differential amplifier input.
This example of a layout is a typical one only. It is not intended to conform to any layout standards, but to show the concept of
the layout, current flow, and the use of planes for power and return.
5
8548-98 Rev. A 3/13
TYPICAL APPLICATION LAYOUT
6
8548-98 Rev. A 3/13
MECHANICAL SPECIFICATIONS
WEIGHT= 70 GRAMS TYPICAL
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates Pin 1.
ORDERING INFORMATION
MSK4230 H U
LEAD CONFIGURATION
S=STRAIGHT, U=BENT UP, D=BENT DOWN
SCREENING
BLANK=INDUSTRIAL; H=MIL-PRF-38534 CLASS H
GENERAL PART NUMBER
M.S. Kennedy Corp.
4707 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.
Contact MSK for MIL-PRF-38534 qualification status.
7
8548-98 Rev. A 3/13