SA60
SA60
P r o d u c t IInnnnoovvaa t i o n FFr roomm
H-Bridge Motor Driver/Amplifiers
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
DESCRIPTION
The SA60 is a pulse width modulation amplifier that
can supply 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 simultaneous amplitude and direction
control for four quadrant mode.
♦ BRUSH TYPE MOTOR CONTROL
♦ CLASS D SWITCHMODE AMPLIFIER
♦ REACTIVE LOADS
♦ MAGNETIC COILS (MRI)
♦ ACTIVE MAGNETIC BEARING
♦ VIBRATION CANCELLING
BLOCK DIAGRAM
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Copyright
© Cirrus Logic, Inc. 2008
(All Rights Reserved)
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APEX − SA60REVK
SA60
P r o d u c t I n n o v a t i o nF r o m
1. Characteristics and Specifications
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Units
SUPPLY VOLTAGE, +VS (Note 4)
80
V
OUTPUT CURRENT, peak
15
A
LOGIC SUPPLY VOLTAGE, VCC
16
V
POWER DISSIPATION, internal (Note 3)
156
W
TEMPERATURE, pin solder, 10s max.
260
°C
TEMPERATURE, junction (Note 2)
150
°C
TEMPERATURE RANGE, storage
−40
85
°C
OPERATING TEMPERATURE RANGE, case
−25
85
°C
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
Specifications
Parameter
Test Conditions1
Min
Typ
Max
Units
INPUT
VCC = 12V
ANALOG INPUT VOLTAGES
A,B OUT = 50% Duty Cycle
1/2 VCC
VDC
A OUT = 100% Duty Cycle High
1/3 VCC
VDC
B OUT = 100% Duty Cycle High
2/3 VCC
VDC
PWM INPUT
PWM PULSE LOW VOLTAGE
0
PWM PULSE HIGH VOLTAGE
2.7
45
PWM FREQUENCY
0.8
VDC
5.0
VDC
250
KHz
DISABLE ON
2.7
VCC
VDC
DISABLE OFF
0
0.8
VDC
2.5
VDC
OUTPUT
VDS (ON) VOLTAGE, each MOSFET
IDS = 10A
1.7
+VS = 80A
91
TOTAL RON, both MOSFETs
0.45
EFFICIENCY, 10A OUTPUT
10
CURRENT, continuous
CURRENT, peak
t = 100 msec
SWITCHING FREQUENCY
CF = 270pF
Ω
%
A
15
A
DEAD TIME
45
KHz
90
nS
POWER SUPPLY
+VS VOLTAGE (Note 4)
+VS Current = Load Current
VCC VOLTAGE
VDC
12
15
VDC
VCC CURRENT
VCC = 12VDC
28
36
mA
+VS CURRENT
Switching, no load, VS = 50V
5
9.5
80
mA
SA60U
SA60
P r o d u c t I n n o v a t i o nF r o m
Parameter
Test Conditions1
Min
Typ
Max
Units
1.6
°C/W
THERMAL (Note 3)
RESISTANCE, junction to case
Full temperature range,
for each transistor
RESISTANCE, junction to air
Full temperature range
30
-25
TEMPERATURE RANGE, case
°C/W
+85
°C
NOTES:
1. (All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical performance characteristics and specifications are derived from measurements taken
at typical supply voltages and TC = 25°C, VCC = 12VDC).
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate
power dissipation to achieve high MTTF.
3. Each of the two active output transistors can dissipate 78W.
4. Derate to 70V below TC = +25°C.
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TYPICAL APPLICATION
A wide variety of loads can be driven in either the voltage
-0"%
mode or the current mode. The most common applica
4"
tions use three external blocks: a low pass filter convert
ing pulse width data to an analog output, a difference am
plifier to monitor 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.
SA60U
SA60
P r o d u c t I n n o v a t i o nF r o m
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 Workbook; 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.
VS - 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 & 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 controlling 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:
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'TX 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 outputs. 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
SA60U SA60
P r o d u c t I n n o v a t i o nF r o m
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 resistor 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.
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected].
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
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CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
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SA60U