CIRRUS SA03

SA03
SA03
P r o d uSA03
c t IInnnnoovvaa t i o n FFr roomm
Pulse Width Modulation Amplifier
FEATURES
• WIDE SUPPLY RANGE—16-100V
• 30A CONTINUOUS TO 60°C case
• 3 PROTECTION CIRCUITS
• ANALOG OR DIGITAL INPUTS
• SYNCHRONIZED OR EXTERNAL OSCILLATOR
• FLEXIBLE FREQUENCY CONTROL
SA03
∆
USA
TE9493
11
BeO
APPLICATIONS
• MOTORS TO 4HP
• REACTIVE LOADS
• LOW FREQUENCY SONAR
• LARGE PIEZO ELEMENTS
• OFF-LINE DRIVERS
• C-D WELD CONTROLLER
12-pin Power DIP
PACKAGE STYLE CR
EXTERNAL CONNECTIONS
DESCRIPTION
ISENSE A
The SA03 is a pulse width amplifier that can supply 3000W
to the load. An internal 45kHz oscillator requires no external
components. The clock input stage divides the oscillator frequency by two, which provides the basic switching of 22.5 kHz.
External oscillators may also be used to lower the switching
frequency or to synchronize multiple amplifiers. Current sensing
is provided for each half of the bridge giving amplitude and
direction data. A shutdown input turns off all four drivers of the
H bridge output.A high side current limit and the programmable
low side current limit protect the amplifier from shorts to supply or ground in addition to load shorts. The H bridge output
MOSFETs are protected from thermal overloads by directly
sensing the temperature of the die.The 12-pin hermetic MO-127
power package occupies only 3 square inches of board space.
BLOCK DIAGRAM AND TYPICAL APPLICATION
CLK IN
CLK OUT
+PWM
1
12
2
11
–PWM/RAMP
4
GND
3
TOP
VIEW
A OUT
* VCC
10
*
9
5
8
6
7
+VS
B OUT
I SENSE B
ILIM/SHDN
Case tied to pin 5. Allow no current in case. Bypassing of supplies
is required. Package is Apex MO-127 (STD). See Outline
Dimensions/Packages in Apex data book.
If +PWM > RAMP/–PWM then A OUT > B OUT.
* See text.
Vcc
10
3
+VS
PWM
4
–PWM/RAMP
9
CURRENT
LIMIT
+PWM
470pF
56K
B OUT
OUTPUT
DRIVERS
8
2
OSC
÷2
1K
I SENSE A
12
SHUTDOWN
CONTROL
CLK IN
6
1
ILIM/SHDN
5
5K
.01µF
RSENSE
1K
7
GND
CONTROL
SIGNAL
MOTOR
11
A OUT
CLK OUT
I SENSE B
RSENSE
5V
5V
SA03U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − SA03UREVH
SA03
P r o d u c t I n n o v a t i o nF r o m
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
PARAMETER
SUPPLY VOLTAGE, +VS
SUPPLY VOLTAGE, VCC
POWER DISSIPATION, internal
TEMPERATURE, pin solder - 10s
TEMPERATURE, junction2
TEMPERATURE, storage
OPERATING TEMPERATURE RANGE, case
INPUT VOLTAGE, +PWM
INPUT VOLTAGE, –PWM
INPUT VOLTAGE, ILIM
TEST CONDITIONS2
MIN
IOUT ≤ 1mA
IOUT ≤ 1mA
4.8
0
44
100V
16V
300W
300°C
150°C
–65 to +150°C
–55 to +125°C
0 to +11V
0 to +11V
0 to +10V
TYP
MAX
UNITS
45
5
4
5.3
.4
46
.9
5.4
V
V
kHz
V
V
V
V
.16
23
Ω
%
kHz
A
A
100
16
80
50
50
V
V
mA
mA
mA
110
100
mV
nA
.83
+85
°C/W
°C/W
°C
CLOCK (CLK)
CLK OUT, high level4
CLK OUT, low level4
FREQUENCY
RAMP, center voltage
RAMP, P-P voltage
CLK IN, low level4
CLK IN, high level4
0
3.7
OUTPUT
TOTAL RON
EFFICIENCY, 10A output
SWITCHING FREQUENCY
CURRENT, continuous4
CURRENT, peak4
VS = 100V
OSC in ÷ 2
60°C case
22
30
40
97
22.5
POWER SUPPLY
VOLTAGE, VS
VOLTAGE, VCC
CURRENT, VCC
CURRENT, VCC, shutdown
CURRENT, VS
Full temperature range
Full temperature range
IOUT = 0
165
14
60
15
No Load
ILIM/SHUTDOWN
TRIP POINT
INPUT CURRENT
90
THERMAL3
RESISTANCE, junction to case
RESISTANCE, junction to air
TEMPERATURE RANGE, case
NOTES: 1.
2.
3.
4.
5.
CAUTION
2
Full temperature range, for each die
Full temperature range
Meets full range specifications
12
–25
Each of the two active output transistors can dissipate 150W.
Unless otherwise noted: TC = 25°C, VS, VCC at typical specification.
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.
Guaranteed but not tested.
If 100% duty cycle is not required VS(MIN) = 0V.
The SA03 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.
SA03U
SA03
P r o d u c t I n n o v a t i o nF r o m
0
EACH ACTIVE
OUTPUT TRANSISTOR
0
50
75
100
25
CASE TEMPERATURE, (C)
98
97
96
REVERSE DIODE
CASE TEMPERATURE
1
8
7
6
5
0.8
1.0
1.2
1.4
1.6
0.6
SOURCE TO DRAIN DIODE VOLTAGE
DUTY CYCLE, (%)
CONTINUOUS AMPS
20
2
–55C
5
–25C
10
15
20
25
OUTPUT CURRENT, (A)
30
60
40
Vcc QUIESCENT CURRENT
115
Vcc = 15V
F = 22.5 kHz
110
105
NORMAL
OPERATION
100
95
90
SHUTDOWN
OPERATION
85
–50 –25 0
25 50 75 100 125
CASE TEMPERATURE, (C)
SA03U
0
150
NORMALIZED Vs QUIESCENT CURRENT, (%)
50
75
100
125
CASE TEMPERATURE, (C)
25 50 75 100 125
–50 –25 0
CASE TEMPERATURE, (C)
25C
A OUT
16
25
98.0
4
20
18
98.5
125C
B OUT
22
99.0
100C
6
80
24
100
99.5
60C
DUTY CYCLE VS ANALOG INPUT
26
100.5
85C
100
28
80
8
0
0
CONTINUOUS OUTPUT
101.0
TOTAL VOLTAGE DROP
10
2
101.5
10K
100K
1M
CLOCK LOAD RESISTANCE, (Ω)
2
30
NORMALIZED Vcc QUIESCENT CURRENT, (%)
F NOMINAL = 45kHz
95
125
10
9
7
6
5
4
3
NORMALIZED FREQUENCY, (%)
50
99
3
180
4
5
6
ANALOG INPUT, (V)
7
Vs QUIESCENT VS VOLTAGE
160
140
120
–55C
100
125C
80
60
40
20
0
20
40
60
Vs, (V)
80
100
NORMALIZED Vcc QUIESCENT CURRENT, (%)
75
102.0
NORMALIZED Vs QUIESCENT CURRENT, (%)
100
3
FLYBACK CURRENT, Isd (A)
NORMALIZED FREQUENCY, (%)
125
25
CLOCK FREQUENCY OVER TEMP
CLOCK LOADING
100
TOTAL VOLTAGE DROP, (V)
INTERNAL POWER DISSIPATION, (W)
POWER DERATING
150
Vcc QUIESCENT CURRENT
100
95
90
85
80
75
5
10
15
20
25
SWITCHING FREQUENCY, F (kHz)
Vs QUIESCENT VS FREQUENCY
100
Vs = 60V, NO LOAD
90
80
70
60
50
40
5
10
15
20
25
SWITCHING FREQUENCY, F (kHz)
3
SA03
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.Cirrus.com for design tools that help
automate pwm filter design; heat sink selection; Apex Precision
Power’s complete Application Notes library; Technical Seminar
Workbook; and Evaluation Kits.
CLOCK CIRCUIT AND RAMP GENERATOR
The clock frequency is internally set to a frequency of approximately 45kHz. The CLK OUT pin will normally be tied
to the CLK IN pin. The clock is divided by two and applied to
an RC network which produces a ramp signal at the –PWM/
RAMP pin. An external clock signal can be applied to the CLK
IN pin for synchronization purposes. If a clock frequency lower
than 45kHz is chosen an external capacitor must be tied to the
–PWM/RAMP pin. This capacitor, which parallels an internal
capacitor, must be selected so that the ramp oscillates 4 volts
p-p with the lower peak 3 volts above ground.
PWM INPUTS
The full bridge driver may be accessed via the pwm input
comparator. When +PWM > -PWM then A OUT > B OUT. A
motion control processor which generates the pwm signal can
drive these pins with signals referenced to GND.
PROTECTION CIRCUITS
In addition to the externally programmable current limit there
is also a fixed internal current limit which senses only the high
side current. It is nominally set to 140% of the continuous
rated output current. Should either of the outputs be shorted
to ground the high side current limit will latch off the output
transistors. Also, the temperature of the output transistors is
continually monitored. Should a fault condition occur which
raises the temperature of the output transistors to 165°C the
thermal protection circuit will activate and also latch off the
output transistors. In either case, it will be necessary to remove
the fault condition and recycle power to VCC to restart the circuit.
CURRENT LIMIT
There are two load current sensing pins, I SENSE A and I
SENSE B. The two pins can be shorted in the voltage mode
connection but both must be used in the current mode connection (see figures A and B). It is recommended that RLIMIT resistors
be non-inductive. Load current flows in the I SENSE pins. To
avoid errors due to lead lengths connect the I LIMIT/SHDN pin
directly to the RLIMIT
resistors (through I SENSE A
the filter network
and shutdown diR LIMIT
vider resistor) and I SENSE B
connect the RLIMIT
1K SHUTDOWN
resistors directly to
I LIMIT/SHDN R
SIGNAL
FILTER
the GND pin.
Switching noise
R
SHDN
C FILTER
spikes will invariably
be found at the I FIGURE A. CURRENT LIMIT WITH
SENSE pins. The SHUTDOWN VOLTAGE MODE.
4
noise spikes could trip the current limit threshold which is only
100 mV. RFILTER and CFILTER should
R LIMIT
be adjusted so as to reduce the
I SENSE B
switching noise well below 100
1K
mV to prevent false current limiting. The sum of the DC level plus
R LIMIT
the noise peak will determine
the current limitSHUTDOWN
I LIMIT/SHDN R
ing value. As in
SIGNAL
FILTER
most switching
R SHDN
C FILTER
circuits it may
be difficult to deFIGURE B. CURRENT LIMIT WITH
termine the true
SHUTDOWN CURRENT MODE.
noise amplitude
without careful attention to grounding of the oscilloscope probe.
Use the shortest possible ground lead for the probe and connect exactly at the GND terminal of the amplifier. Suggested
starting values are CFILTER = .01uF, RFILTER = 5k .
The required value of RLIMIT in voltage mode may be calculated by:
RLIMIT = .1 V / ILIMIT
where RLIMIT is the required resistor value, and ILIMIT is the
maximum desired current. In current mode the required value
of each RLIMIT is 2 times this value since the sense voltage is
divided down by 2 (see Figure B). If RSHDN is used it will further
divide down the sense voltage. The shutdown divider network
will also have an effect on the filtering circuit.
I SENSE A
1K
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 bypass capacitors must be physically
connected directly to the power supply 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 pin will suffice.
STARTUP CONDITIONS
The high side of the all N channel output bridge circuit is
driven by bootstrap circuit and charge pump arrangement. In
order for the circuit to produce a 100% duty cycle indefinitely
the low side of each half bridge circuit must have previously
been in the ON condition. This means, in turn, that if the input
signal to the SA03 at startup is demanding a 100% duty cycle,
the output may not follow the command and may be in a tristate condition. The ramp signal must cross the input signal
at some point to correctly determine the output state. After the
ramp crosses the input signal level one time, the output state
will be correct thereafter.
SA03U
P r o d u c t I n n o v a t i o nF r o m
SA03
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
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does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
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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SA03U
5