MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
FEATURES:
100 VOLT 10 AMP RAD-HARD
H-BRIDGE PWM MOTOR
DRIVER/AMPLIFIER
4204RH
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
Total Dose Hardened To TBD Krad(Si) (Method 1019.8 Condition A)
100 Volt, 10 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 K and Class H
Output Stage Includes Blocking and Reverse Diodes
Contact MSK for MIL-PRF-38534 Qualification and Appendix G (Radiation Status)
The MSK 4204RH is a radiation hardened complete H-Bridge microcircuit intended for use in DC brushed motor control
applications or Class D switchmode amplification in space or other severe operating environments. The internal compo-
nents have been selected to provide total dose up to 300K RAD for military and space applications. All of the drive/control
circuitry for the lowside and highside switches are internal to the device. The 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. If
100% duty cycle is required, access to the high-side bias has been provided. With the addition of two isolated power
supplies 100% duty cycle is possible. The MSK 4204RH is packaged in a space efficient isolated power package, available
in three lead form configurations that can be directly connected to a heatsink.
DESCRIPTION:
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
1
2
3
4
5
6
7
1
PIN-OUT INFORMATION
GND
GND
GND
NC
GND
GND
INPUT
8
9
10
11
12
13
14
NC
NC
NC
GND
GND
NC
SHUTDOWN
15
16
17
18
19
20
21
NC
+VCC
+VCC
BV-
NC
BØ
BVB
22
23
24
25
26
27
28
BV+
NC
AV-
NC
AØ
AVB
AV+
PRELIMINARY Rev. B 1/11
ABSOLUTE MAXIMUM RATINGS
V+
V
CC
I
OUT
I
PK
V
OUT
V
IN
V
L
V
B
8
High Voltage Supply
100V
Logic Supply
20V
Continuous Output Current
10A
Peak Output Current
20A
Output Voltage Range
GND-5V min. to V+ max.
Input Voltage
Vcc
Logic Input Voltage (Shutdown)
0V to Vcc
High-Side Bias
20V
T
ST
T
LD
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
T
C
Case Operating Temperature
MSK 4204 K/H RH
MSK 4204 RH
T
J
Junction Temperature
θJc
Thermal Resistance
(Output F
ETS
@ 125°C)
(Ouput Diodes @ 125°C)
-65°C to +150°C
300°C
-55°C to +125°C
-40°C to +85°C
+150°C
2.5°C/W
3.2°C/W
ELECTRICAL SPECIFICATIONS
NOTES:
1
2
3
4
5
6
7
8
9
V
CC
=
15V
,
V+=28V
,
AV-,BV-=Ground, Shutdown=OV unless otherwise specified.
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 Subgroups 1, 4 and 7 unless otherwise requested.
Military and Space grade devices ("H" and "K") shall be 100% tested to subgroups 1,2,3,4,5,6 and 7.
Subgroup 1,4,7
T
A
=T
C
=
+25°C
2,5
T
A
=T
C
=
+125°C
3,6
T
A
=
T
C
=
-55°C
Industrial grade and devices shall be 100% tested at 25°C only.
The internal on resistance is for the die only. This should be used for thermal calculations only.
Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
Pre and post irradiation limits @ 25°C, up to TBD Krad, are identical unless otherwise specified.
2
PRELIMINARY Rev. B 1/11
APPLICATION NOTES
MSK 4204RH 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. Optimum operation occurs with V
CC
set at 15V.
AV+, BV+
- Are the high voltage H-bridge supply pins.
The MOSFETS obtain the drive current from these supply
pins. The MOSFETS are rated at 100 volts. Proper by-
passing to GND with sufficient capacitance to suppress any
voltage transients, and ensure removal of any drooping dur-
ing switching, should be done as close to the pins on the
hybrid as possible.
AØ
- Are the output pins for one half of the bridge. Increas-
ing the input voltage causes increasing duty cycles at this
output.
BØ
- Are the output pins for the other half of the bridge.
Decreasing the input voltage causes increasing duty cycles
at this output.
AVB & BVB
- Are the high-side bias pins. Some applications
require that the high-side be on for an indefinite period of
time. Under these conditions the charge in the boost capaci-
tor will not be adequate to keep the high-side output on. If
continuous on time is required, external floating power sup-
plies must be connected to the AVB and BVB pins to power
the high-side drive. Blocking diodes should be used to pre-
vent Vcc from sourcing current to the floating supply should
Vcc rise above the floating supply level. Reference typical
system operation schematic. If not used, the high-side bias
pins must remain high impedance.
AV-
- Are the connections 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 con-
nected directly to ground. The maximum voltage on these
pins is ±5 volts with respect to GND.
BV-
- Are the connections 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 di-
rectly to ground. The maximum voltage on these pins is ±5
volts with respect to GND.
GND
- Is the return connection for the input logic and Vcc.
3
INPUT
- Is an analog input for controlling the PWM pulse
width of the bridge. A voltage higher than 7.5V will produce
greater than 50% duty cycle pulses out of OUTPUT B. A
voltage lower than 7.5V will produce greater than 50% duty
cycle pulses out of OUTPUT A.
SHUTDOWN
- Is the connection for disabling all 4 output
switches. SHUTDOWN high overrides all other inputs. When
taken low, everything functions normally. An internal pullup
to Vcc will keep SHUTDOWN high if left unconnected. This
pin should be grounded if not used.
UVLO
- The under voltage lockout function of the MSK
4204RH prevents the device from starting before sufficient
bias voltage is available. The UVLO feature monitors the VCC
supply and holds the outputs low until the voltage level rises
above the threshold during start up. After start up the low
side UVLO curcuit will hold the low side switches off if VCC
falls below the threshold. The high side UVLO circuit will
hold the high side switches off any time the voltage on the
bootstrap capacitor falls below the threshold.
MAXIMUM DUTY CYLE AND HIGH SIDE BIAS
- The MSK
4204RH uses two independent bootstrap circuits to power
each of the high side switches. When the switches are turned
on the high side drivers are powered by the charge in the
bootstrap capacitors. The voltage on the bootstrap capaci-
tors has an initial 40mV drop and decays at a rate of ap-
proximately 0.23V every 100uS. The voltage can be approxi-
mated by the equation:
V
BS
=+V
CC
-0.64V-2.3 x T
ON
T
ON
is the switch on time in mS
V
BS
is the bootstrap capacitor voltage
V
BS
should be greater or equal to 10 volts to ensure that
V
BS
does not drop below the UVLO threshold.
TOTAL DOSE RADIATION TEST
PERFORMANCE
Radiation performance curves for TID testing will be gen-
erated for all radiation testing performed by MS Kennedy.
These curves show performance trends throughout the TID
test process and can be located in the MSK 4204RH radia-
tion test report. The complete radiation test report will be
available in the RAD HARD PRODUCTS section on the MSK
website.
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
PRELIMINARY Rev. B 1/11
TYPICAL SYSTEM OPERATION
This is a diagram of a typical application of the MSK 4204RH. The design Vcc voltage is +15 volts and should have a good low
ESR bypass capacitor such as a tantalum. 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.
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 hybrid 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 capacitor as close to hybrid 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 100V and negative spikes below -4V with respect to GROUND.
5
PRELIMINARY Rev. B 1/11
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