APEX MICROTECHNOLOGY CORPORATION · TELEPHONE (520) 690-8600 · FAX (520) 888-3329 · ORDERS (520) 690-8601 · EMAIL prodlit@apexmicrotech.com

FEATURES

· LOW COST COMPLETE H-BRIDGE

· SELF-CONTAINED SMART LOWSIDE/HIGHSIDE DRIVE

CIRCUITRY

· WIDE SUPPLY RANGE: UP TO 80V

· 10A CONTINUOUS OUTPUT

· ISOLATED CASE ALLOWS DIRECT HEATSINKING

· FOUR QUADRANT OPERATION, TORQUE

CONTROL CAPABILITY

· INTERNAL/PROGRAMMABLE PWM FREQUENCY

GENERATION

APPLICATIONS

· BRUSH TYPE MOTOR CONTROL

· CLASS D SWITCHMODE AMPLIFIER

· REACTIVE LOADS

· MAGNETIC COILS (MRI)

· ACTIVE MAGNETIC BEARING

· VIBRATION CANCELLING

DESCRIPTION

The SA60 is a pulse width modulation amplifier that can sup-

ply 10A 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 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 internal PWM frequency can be programmed
by an external integrator capacitor. Alternatively, the user may
provide an external TTL-compatible PWM signal for simultane-
ous amplitude and direction control for four quadrant mode.

BLOCK DIAGRAM

TYPICAL APPLICATION

A wide variety of loads can be driven in either the voltage

mode or the current mode. The most common applications
use three external blocks: a low pass filter converting pulse
width data to an analog output, a difference amplifier to moni-
tor voltage or current and an error amplifier. Filter inductors
must be suitable for square waves at the switching frequency
(laminated steel is generally not acceptable). Filter capacitors
must be low ESR and rated for the expected ripple current. A
difference amplifier with gain of less than one translates the
differential output voltage to a single feedback voltage. Dashed
line connections and a higher gain difference amplifier would
be used for current control. The error amplifier integrates the
difference between the input and feedback voltages to close
the loop.

EXTERNAL CONNECTIONS

12-PIN POWER SIP

PACKAGE STYLE DP

Formed Leads Available

See package styles ED & EE

APEX MICROTECHNOLOGY CORPORATION · 5980 NORTH SHANNON ROAD · TUCSON, ARIZONA 85741 · USA · APPLICATIONS HOTLINE: 1 (800) 546-2739

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

INPUT
ANALOG INPUT VOLTAGES

Vcc = 12V

A, B OUT = 50% Duty Cycle

1/2VCC

Vdc

A OUT = 100% Duty Cycle High

1/3VCC

Vdc

B OUT = 100% Duty Cycle High

2/3VCC

Vdc

PWM INPUT
PWM PULSE LOW VOLTAGE

0.8

Vdc

PWM PULSE HIGH VOLTAGE

2.7

5.0

Vdc

PWM FREQUENCY

250

KHz

DISABLE ON

2.7

Vcc

Vdc

DISABLE OFF

0.8

Vdc

OUTPUT
Vds (ON) VOLTAGE, each MOSFET

Ids = 10A

1.7

2.5

Vdc

TOTAL Ron, both MOSFETs

.45

EFFICIENCY, 10A OUTPUT

= 80V

CURRENT, continuous

CURRENT, peak

t = 100 msec

SWITCHING FREQUENCY

Cf = 270 pf

KHz

DEAD TIME

POWER SUPPLY
+V

VOLTAGE

Current = Load Current

Vdc

Vcc VOLTAGE

9.5

Vdc

Vcc CURRENT

Vcc = 12Vdc

CURRENT

Switching, no load, V

= 50V

THERMAL

RESISTANCE, junction to case

Full temp range, for each transistor

1.6

°C/W

RESISTANCE, junction to air

Full temperature range

°C/W

TEMPERATURE RANGE, case

+85

°C

ABSOLUTE MAXIMUM RATINGS

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

SUPPLY VOLTAGE, +V

80V

OUTPUT CURRENT, peak

15A

LOGIC SUPPLY VOLTAGE, Vcc

16V

POWER DISSIPATION, internal

156W

TEMPERATURE, pin solder - 10s max.

260°C

TEMPERATURE, junction

150°C

TEMPERATURE RANGE, storage

40 to +85°C

OPERATING TEMPERATURE RANGE, case

25 to +85°C

SA60

SPECIFICATIONS

The SA60 is constructed from MOSFET transistors. ESD handling procedures must be observed.
The exposed substrate contains beryllia (BeO). Do not crush, machine, or subject to temperatures in excess of 850°C to

avoid generating toxic fumes.

CAUTION

NOTES: 1. Each of the two active output transistors can dissipate 78W.

2. Unless otherwise noted: T

= 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. Derate to 70V below T

= +25°C.

APEX MICROTECHNOLOGY CORPORATION · 5980 NORTH SHANNON ROAD · TUCSON, ARIZONA 85741 · USA · APPLICATIONS HOTLINE: 1 (800) 546-2739

OPERATING

CONSIDERATIONS

SA60

GENERAL

Please read Application Note 30 on "PWM Basics". Refer

to Application Note 1 "General Operating Considerations" for
helpful information regarding power supplies, heat sinking and
mounting. Visit www.apexmicrotech.com for design tools that
help automate pwm filter design; heat sink selection; Apex's
complete Application Notes library; Technical Seminar Work-
book; and Evaluation Kits.

PWM OSCILLATOR INTERNAL OR EXTERNAL

The SA60 contains an internal PWM oscillator whose

frequency is determined by an external capacitor connected
between pin 1 and pin 2. Maximum frequency is 125 kHz.
The user may also disregard the internal PWM oscillator and
supply the SA60 with an external TTL pulse generator up to
250KHZ.

PIN DESCRIPTION

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.

- is the higher voltage H-bridge supply. The MOSFETS

obtain the output current from this supply pin. The voltage on
this pin is limited to +80V by the drive IC. The MOSFETS are
rated at 100 volts.

ISENSE A AND B - These are tied to power gnd directly or

through sense resistors.

ANALOG GND - is the reference for the internal PWM

oscillator. Connect this pin to pin 6. Connect low side of Vcc
supply and any other supply used to generate analog input
signals to ANALOG GND.

ANALOG INPUT - is an analog input for controlling the

PWM pulse width of the bridge. A voltage higher than Vcc/2
will produce greater than 50% duty cycle pulses out of B OUT.
A voltage lower than Vcc/2 will produce greater than 50% duty
cycle pulses out of A OUT. If using in the digital mode, bias
this point at 1/2 the logic high level.

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 pin left open.

PWM INPUT - Is the TTL compatible digital input for control-

ling the PWM pulse width of the bridge. A duty cycle greater
than 50% will produce greater than 50% duty cycle pulses out
of the A out. A duty cycle less than 50% will produce greater
than 50% duty cycle from the B out. For analog inputs, the
integration capacitor for the internal clock must be connected
between this pin and analog ground. The internal switching
frequency is programmable up to 125 kHz by selection of the
integration capacitor. The formula is:

BYPASSING

Adequate bypassing of the power supplies is required for

proper operation. Failure to do so can cause erratic and low
efficiency operation as well as excessive ringing at the out-
puts. The Vs supply should be bypassed with at least a 1µF
ceramic capacitor in parallel with another low ESR capacitor
of at least 10µF per amp of output current. Capacitor types
rated for switching applications are the only types that should
be considered. The 1µF ceramic capacitor must be physically
connected directly to the Vs and POWER GND pins. Even one
inch of lead length will cause excessive ringing at the outputs.
This is due to the very fast switching times and the inductance
of the lead connection. The bypassing requirements of the Vcc
supply are less stringent, but still necessary. A .1µF to .47µF
ceramic capacitor connected directly to the Vcc and ANALOG
GND pins will suffice.

PCB LAYOUT

The designer needs to appreciate that the SA60 combines

in one circuit both high speed high power switching and low
level analog signals. Certain layout rules of thumb must be
considered when a circuit board layout is designed using the
SA60:
1. Bypassing of the power supplies is critical. Capacitors

must be connected directly to the power supply pins with
very short lead lengths (well under 1 inch). Ceramic chip
capacitors are best.

2. Connect ANALOG GND to POWER GND with a conductor

having no intermediate connections. Connect all Vs power
supply, filter and load related ground connections to POWER
GND keeping these conductors separate until reaching pin
6. Connect all Vcc power supply and input signal related
ground connections to ANALOG GND keeping conductors
separate until reaching pin 1. Do not allow ground loops to
form by making additional ground connections at the low
side of the physical power supplies. If ground plane is used
do not allow more than 1mA to flow through it.

3. Beware of capacitive coupling between output connections

and signal inputs through the parasitic capacitance between
layers in multilayer PCB designs.

4. Do not run small signal traces between the pins of the output

section (pins 8-12).

CURRENT SENSE

There are two load current sensing pins, I SENSE A and I

SENSE B. The two pins can be shorted to POWER GND in
the voltage mode connection but both must be used in the
current mode connection. It is recommended that R SENSE
resistors be non-inductive. Load current flows in the I SENSE
pins. The SA60 has no internal current limit.

TRANSIENT SUPPRESSION

An RC Network of A 100 PF Capacitor and a one ohm resis-

tor is required as shown in the external connection diagram on
page 1. This network assures proper operation under various
loads. Minimal power is dissipated in the resistor.

This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.

Part Number SA60