Apex SA51 Datasheet

H/BRIDGE MOTOR DRIVER/AMPLIFIER

MICROTECHNOLOGY

HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX [phone]

FEA TURES

• LOW COST COMPLETE H-BRIDGE

• SELF-CONTAINED SMART LOWSIDE/HIGHSIDE DRIVE
CIRCUITRY

• SINGLE SUPPLY OPERATION

• WIDE SUPPLY RANGE: UP TO 80V

• 5A CONTINUOUS OUTPUT

• HERMETIC SEALED PACKAGE

• HIGH EFFICIENCY: 97%

• FOUR QUADRANT OPERATION, TORQUE
CONTROL CAPABILITY

APPLICATIONS

• BRUSH TYPE MOTOR CONTROL

• CLASS D SWITCHMODE AMPLIFIER

• REACTIVE LOADS

• MAGNETIC COILS (MRI)

• ACTIVE MAGNETIC BEARING

• VIBRATION CANCELLING

DESCRIPTION

The SA51 is a pulse width modulation amplifier that can

supply 5A continuous current to the load. The full bridge
amplifier can be operated over a wide range of supply volt­ages. All of the drive/control circuitry for the lowside and
highside switches are internal to the hybrid. The user provides
a TTL compatible PWM signal for simultaneous amplitude and
direction control in four quadrant mode. The internal circuitry
will provide proper deadtime protection for each half bridge. All
N-channel FETs mean the best efficiency for the size, both in
terms of on-resistance and switching capability. For an idle/
sleep mode or for fault protection, a TTL compatible disable pin
is provided so as to shut down all four transistors. The SA51
is packaged in a space efficient isolated 8-pin TO-3 that can be
directly connected to a heatsink.

BLOCK DIAGRAM

+V

S

SA51

TYPICAL APPLICATION

Vcc

PWM

INPUT

SA51

DISABLE

INPUT

GND

Vcc

PWM

INPUT

DISABLE

INPUT

SA51

+V

S

+V

S

SPEAKER

DC MOTOR

GND

(LOAD)

BA

V

CC

(+12V)

DISABLE

(PWM) INPUT

GND

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H-BRIDGE

DRIVE

CIRCUITRY

RSENSE

(CURRENT)

EXTERNAL CONNECTIONS

VCC

3

DISABLE

GND

INPUT

4

TOP VIEW

5

6

B OUT

2

7

A OUT

+V

1

8

RSENSE

S

SA51

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +V
OUTPUT CURRENT, peak 7A
LOGIC SUPPLY VOLTAGE, Vcc 16V
POWER DISSIPATION, internal 120W
TEMPERATURE, pin solder - 10s 300°C
TEMPERATURE, junction
TEMPERATURE, storage –65 to +150°C
OPERATING TEMPERATURE RANGE, case –65 to +125°C
INPUT VOLTAGE, INPUT 0 to Vcc
INPUT VOLTAGE, DIS 0 to Vcc

S

3

80V

1

150°C

SPECIFICATIONS

PARAMETER TEST CONDITIONS
INPUT

PWM PULSE LOW VOLTAGE 0 0.6 Vdc
PWM PULSE HIGH VOLTAGE 3.6 5.0 Vdc
PWM FREQUENCY 45 500 KHz
DISABLE ON 3.6 V
DISABLE OFF 0 0.6 Vdc

OUTPUT

Vds (ON) VOLTAGE, each MOSFET Ids = 5A 1.25 1.8 Vdc
TOTAL Ron, both MOSFETs 0.5 Ω
EFFICIENCY, 5A OUTPUT +VS = 80V 97 %
CURRENT, continuous 5 A
CURRENT, peak T = 100ms 7 A
SWITCHING CHARACTERISTICS

RISE TIME 36 54 nS
FALL TIME 170 250 nS
DEAD TIME 100 nS

4

+VS = 28V, Vcc = 12V, Ic =2A

2

MI N TYP MAX UNITS

CC

Vdc

POWER SUPPLY

+VS VOLTAGE +VS Current = Load Current 80 Vdc
Vcc VOLTAGE 9 12 16 Vdc
Vcc CURRENT Vcc = 12Vdc 11 18 mA

THERMAL

RESISTANCE, junction to case Full temp range, for each transistor 2.0 °C/W
RESISTANCE, junction to air Full temperature range 30 °C/W
TEMPERATURE RANGE, case –25 +85 °C

NOTES: 1. Each of the two active output transistors can dissipate 60W.

CAUTION

3

2. Unless otherwise noted: TC = 25°C, Vcc = 12Vdc.

3. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power
dissipation to achieve high MTTF. For guidance, refer to the heatsink data sheet.

4. Guaranteed but not tested.

The SA51 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or

subject to temperatures in excess of 850°C to avoid generating toxic fumes.

WARNING—AMPLIFIER PROTECTION

The SA51 contains an internal logic chip that turns on and
turns off output MOSFET drivers at a certain sequence. Noise
or oscillation caused by external wiring inductance, lack of
proper power supply bypass capacitors, ground, supply, and
local internal loops may be fed back to this logic chip and cause
it to turn on one or more MOSFET drivers at the wrong time,

thus destroying the SA51. A well laid out PC board with low

impedance copper ground plane is necessary for the
SA51 to function properly. The Apex EK-SA51 evaluation

board is recommended for fast and easy breadboarding of
circuits using the SA51.

APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: [phone]