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ISO 9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
10 AMP, 75V, 3 PHASE MOSFET BRIDGE WITH INTELLIGENT INTEGRATED GATE DRIVE
4300
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
FEATURES:
75 Volt Motor Supply Voltage 10 Amp Output Switch Capability, All N-Channel MOSFET Output Bridge 100% Duty Cycle High Side Conduction Capable Suitable for PWM Applications from DC to 100KHz Shoot-Through/Cross Conduction Protection Undervoltage Lockout Protection Programmable Dead-Time Control Low Active Enable for Bridge Shutdown Control Isolated Package Design for High Voltage Isolation Plus Good Thermal Transfer Available with Three Lead Bend Options
MIL-PRF-38534 QUALIFIED
DESCRIPTION:
The MSK 4300 is a 3 phase MOSFET bridge plus drivers in a convenient isolated hermetic package. The hybrid is capable of 10 amps of output current and 75 volts of DC bus voltage. It has a full line of protection features, including undervoltage lockout protection of the bias voltage, cross conduction control and a user programmable dead-time control for shoot-through elimination. In addition, the bridge may be shut down by using the EN (enable) control. The MSK 4300 provides good thermal conductivity for the MOSFETs due to the electrically isolated package design that allows direct heat sinking of the device without insulators.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
3 Phase Brushless DC Servo Control Fin Actuator Control Gimbal Control 3 Phase AC Induction Motor Control HVAC Blower Control
1 Rev. C 6/00
ABSOLUTE MAXIMUM RATINGS

-55C to +125C +150C

ELECTRICAL SPECIFICATIONS
Parameter CONTROL SECTION VBIAS Quiescent Current VBIAS Operating Current Undervoltage Threshold (Falling) Undervoltage Threshold (Rising) Low Level Input Voltage High Level Input Voltage Low Level Input Current High Level Input Current OUTPUT BRIDGE Drain-Source Breakdown Voltage Drain-Source Leakage Current Drain-Source On Resistance SWITCHING CHARACTERISTICS Rise Time Fall Time 1 1 V+=30V, RL=3 ID=10A SWR Resistor= SWR Resistor= SWR Resistor= SWR Resistor= SWR = SWR=12K 1 1 ISD=10A ISD=10A, di/dt=100A/S 4 4 4 4 4 4 6.0 0.3 5 6 0.5 5 5 0.5 7.0 0.5 1.05 75 2 8 8 2 8.0 0.7 1.25 6.0 0.3 5 6 0.5 5 5 0.5 7.0 0.5 1.05 75 3 10 10 3 8.0 0.7 1.25 nSec nSec Sec Sec Sec Sec Sec Sec Volts nSec 1 1 1 ID=25A, All Inputs Off VDS=70V ID=10A 1 70 25 0.300 0.16 70 25 0.300 0.16 V Amp 1 1 1 1 VIN=0V VIN=5V All Inputs Off f=20KHz, 50% Duty Cycle 1,2,3 1,2,3 1 1 5.75 6.2 2.7 60 -1 2.5 12.5 6.6 7.1 100 8 15 7.5 8.0 0.8 135 +1 5.75 6.2 2.7 60 -1 2.5 12.5 6.6 7.1 100 8 15 7.5 8.0 0.8 135 +1 mAmp mAmp Volts Volts Volts Volts Amp Amp Test Conditions GroupA 4 Subgroup Min. MSK 4300H 3 Typ. Max. Min. MSK 4300 2 Typ. Max. Units
Drain-Source On Resistance (Each FET) (Each FET, For Thermal Calculations Only)
Turn-On Prop Delay (Lower) Turn-Off Prop Delay (Lower) Turn-On Prop Delay (Upper) Turn-Off Prop Delay (Upper) Dead Time Dead Time SOURCE-DRAIN DIODE CHARACTERISTICS Forward Voltage Reverse Recovery Time
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 subgroups 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. Subgroup 1, 4 TA = TC = +25C 2, 5 TA = TC = +125C 3, 6 TA = TC = -55C 2 Rev. C 6/00

V+ VBIAS VIND IOUT IPK
High Voltage Supply 75V Bias Supply 16V Logic Input Voltages -0.3V to VBIAS +0.3V Continuous Output Current 10A Peak Output Current 25A
JC Thermal Resistance TST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) TC Case Operating Temperature TJ Junction Temperature
9C/W -65C to +150C +300C
APPLICATION NOTES MSK 4300 PIN DESCRIPTIONS
AL,BL,CL - Are the lowside logic level digital inputs. These three inputs control the three lowside bridge transistors. If the highside inputs are low, then the lowside inputs will control both the lowside and the highside of the bridge, with deadtime set by the SWR resistor. EN will override these inputs, forcing all outputs low. These inputs can be driven by logic up to 15V (less than VBIAS). An internal pullup to VBIAS will hold each input high if the pins are not driven. AH,BH,CH - Are the highside logic level digital inputs. These three inputs control the three highside bridge transistors. Unless the deadtime is disabled by connecting SWR to ground, the lowside input of each phase will override the corresponding highside input. If SWR is the lowside input of each phase will override the corresponding highside input. In this condition, tied to ground, deadtime is disabled and the outputs follow the inputs. In this condition, shoot-through must be avoided externally. EN will override all inputs, forcing outputs low. VBIAS - Is the positive supply for the gate drive. This pin should be decoupled to ground with at least a 10F capacitor. GROUND - Is the return for the VBIAS supply. This pin should be connected to the return of the lowside MOSFETs or the bottom of the sense resistor at the bottom of the bridge. The gate drive current must return through this pin, so trace lengths should be kept to a minimum. All grounds should be returned to the bottom of the bridge or sense resistor in a star fashion. This will eliminate ground loops. SWR - Is the pin for controlling the deadtime between the top and bottom transistors of the bridge. By connecting a pullup resistor between this pin and VBIAS, various deadtimes can be obtained. There is and internal 100K pullup resistor connected internally. By adding additional resistors in parallel externally, reduced deadtimes can be achieved. By connecting this pin to ground, all deadtime is eliminated. However, care must be taken to assure that deadtime is being generated by the logic circuitry driving the inputs. Shoot-through can occur (both the top and bottom transistors on at the same time for a given phase, causing a short on the V+ supply to ground) destroying the bridge. V+ - Is the power connection for the top of the output bridge. This pin must be bypassed by a capacitor to ground of a least 10F per amp of output current minimum, and high quality high frequency bypass capacitance to help suppress switching noise. AO, BO, CO - Are the output pins for the three phases of the power bridge. EN - Is the enabling input for the bridge. This digital input, when pulled low, will enable the bridge, following the inputs from AL, BL, CL and AH, BH, CH inputs. When pulled high, it will override all other inputs and disable the bridge. It is internally pulled high to VBIAS, and can be driven by logic levels up to VBIAS. RSENSE - Are the connections to the bottom of the bridge. All power flowing through the bridge will flow through this point, and can be sensed by connecting a sense resistor from here to ground. The sense resistor will develop a voltage proportional to the current flowing. Size the value and power rating of the sense resistor according to the voltage necessary. 3 volts is the maximum voltage between this point and ground, or damage to the hybrid will result. 3
BUS VOLTAGE FILTER CAPACITORS
The size and placement of the capacitors for the main voltage bus for the motor will have an effect on the noise filtered throughout the rest of the system. Series RLC tuned circuit is being created by the inductance of the wire (about 30nH per inch), the filter capacitance, and all of the resistances (wire resistance and the capacitor ESR) of the overall power circuit. Voltage spikes from the back EMF if the motor ride on top of the bus voltage. All of this must be taken into account when laying out the system. A first capacitor of high quality and low ESR should be placed as close to the hybrid circuit as possible. Along with that, a capacitor of 5x to 10x the first value should be added (and that second capacitor should have some ESR) and/or a resistor should be added to help with the damping of the voltage spikes. Be careful of the ripple current in all the capacitors. Excessive ripple current, beyond what the capacitor is rated for, will destroy the capacitor.
BIAS SUPPLY BYPASS CAPACITORS
It is recommended that at least 10F of capacitance for bypassing the VBIAS voltage that supplies the drive circuitry for the MSK 4300, along with 0.1F for helping the high frequency current pulses needed by the gate driver. If an extremely long risetime is exhibited by the turn on of the FETs, the extra high frequency capacitance will help.
GENERAL LAYOUT
Good high frequency PC layout techniques are a must. Traces wide enough for the current delivered, and placement of the big capacitors close to the MSK 4300 are very important. The path for the RSENSE connection through any sense resistor back to the GND pins must be as short as possible. This path is the gate drive current path for all the FETs on the lower half of each phase. A short, low inductance path will aid in the switching time of those FETs.
IN
LOW POWER STARTUP
When starting up the circuit utilizing the MSK 4300 for the first time, it is very important to keep certain things in mind. Because of the small size of the bridge, there is no internal short circuit protection and a short circuit will destroy the bridge. Any required short circuit protection must be built outside the bridge. Current and voltage limit the power supply feeding the V+ pins to the bridge, and monitor the current for any signs of short circuiting, or shoot-through currents. If there are large current spikes at the beginning of each switching cycle, there may be shoot through. Try raising the resistor value of the SWR. This will lengthen the deadtime and stop shoot-through. Rev. C 6/00
TYPICAL APPLICATION SCHEMATIC
TYPICAL PERFORMANCE CURVES
4
Rev. C 6/00
MECHANICAL SPECIFICATIONS
ESD Triangle Indicates Pin 1. NOTE: ALL DIMENSIONS ARE .010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
MSK4300 H U
LEAD CONFIGURATIONS S= STRAIGHT; U= BENT UP; D= BENT DOWN SCREENING BLANK= INDUSTRIAL; H= MIL-PRF-38534 GENERAL PART NUMBER
The above example is a Military grade hybrid with leads bent up.
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.
M.S. Kennedy Corp.
5
Rev. C 6/00

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