4224ds

Output B

Rsense B

V+

Rsense A

Output A

8170 Thompson Road Cicero, N.Y. 13039

(315) 699-9201

M.S.KENNEDY CORP.

ISO 9001 CERTIFIED BY DSCC

75 VOLT 10 AMP MOSFET

H-BRIDGE PWM MOTOR

DRIVER/AMPLIFIER

4224

The MSK 4224 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

250KHz 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 4224 is constructed on a space efficient

ceramic coated insulated metal substrate that can be directly connected to a heatsink.

DESCRIPTION:

EQUIVALENT SCHEMATIC

TYPICAL APPLICATIONS

PIN-OUT INFORMATION

HEN

Disable

N/C

Input

Ground

N/C

Vcc

Output A

Rev.- 06/98

FEATURES:

•

Low RDS(ON) 0.020

Ω

Typical

•

Low Cost Complete H-Bridge

•

10 Amp Capability, 75 Volt Maximum Rating

•

Self-contained Smart Lowside/Highside Drive Circuitry

•

Internal 250KHz PWM Generation, 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

OUTPUT CHARACTERISTICS

RDS (ON) 4

VDS(ON) Voltage 1

Instantaneous Forward Voltage 1

Reverse Recovery Time 1

Leakage Current 1

PWM Frequency

Vcc SUPPLY CHARACTERISTICS

Quiescent Bias Current

Vcc Voltage Range 1

INPUT SIGNAL CHARACTERISTICS 1

Analog Input Voltage

LOGIC CONTROL INPUTS 1

SWITCHING CHARACTERISTICS 1

Rise-Time

Fall-Time

Dead-Time

V+ High Voltage Supply ..................................... 75V

Logic Supply ................................................ 16V

OUT

Continuous Output Current............................ 10A

Peak Output Current ..................................... 20A

OUT

Output Voltage Range .... GND -2V min. to V + max.

JC Thermal Resistance ................................ .5.3°C/W

(Output Switches)

ABSOLUTE MAXIMUM RATINGS

Each MOSFET I

=10A

Each MOSFET I

=10A 3

Each MOSFET I

=10A Intrinsic Diode 3

Intrinsic Diode

Each MOSFET V+=70V

Analog Input=6V

Output A,B=50% Duty Cycle

Output A=100% Duty Cycle High

Output B=100% Duty Cycle High

Input Voltage LO

Input Voltage HI

Input Current (DISABLE=0V)

Input Voltage LO

Input Voltage HI

Input Current (HEN=0V)

=100

Ω

Parameter

ELECTRICAL SPECIFICATIONS

Units

Ω

KHz

M a x .

0.013

TBD

280

275

TBD

0.8

-135

0.8

-270

MSK 4224

T y p .

TBD

1.0

250

TBD

100

M i n .

225

2.7

Test Conditions 2

Rev.- 06/98

Storage Temperature Range .... -65C to +150°C

Lead Temperature Range .................. .....300°C

(10 Seconds)

Case Operating Temperature

MSK4224 ........................ ....-25°C to +125°C

Junction Temperature ................... .....+150°C

NOTES:

Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.

Vcc=+12V unless otherwise specified.

Measure 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.

All Ratings: Tc= +25°C Unless Otherwise Specified

Disable Input

HEN Input

APPLICATION NOTES

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.

OUTPUT B - Is the output pin for the other half of the

bridge. Increasing the input voltage causes increasing

duty cycles at this output.

OUTPUT A - Is the output pin for one half of the bridge.

Decreasing 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 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.

This is a diagram of a typical application of the MSK4224.

The design Vcc voltage is +12 volts and should have a

good low ESR bypass capacitor such as a tantalum electro-

lytic. 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 direc-

tion 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 re-

quired 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 sepa-

rately. 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 induc-

tance in the power loop. It is important to design the snub-

ber network to suppress any positive spikes above 70V and

negative spikes below -2V with respect to ground.

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 volt-

age transients, and to ensure removing any drooping

during switching, should be done as close to the pins

of the module as possible.

MSK 4224 PIN DESCRIPTIONS

TYPICAL SYSTEM OPERATION

Rev.- 06/98