APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
SA13
USA
BeO
TE949311
+V
S
NC
OUT
SHDN
NC
PWR GND
RSENSE
SIG GND
CLK IN
CONTROL
SIGNAL
3/7V
CLK OUT
PWM/RAMP
+PWM
Vcc
5V
5V
SHUTDOWN
CONTROL
OUTPUT
DRIVERS
PWM
56K
5K
.01
F
470pF
2
OSC
CURRENT
LIMIT
9
8
3
10
4
2
1
5
12
11
6
7
10V
P-P
LOAD
FEATURES
HALF BRIDGE OUTPUT
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
APPLICATIONS
MOTORS TO 4HP
REACTIVE LOADS
LOW FREQUENCY SONAR
LARGE PIEZO ELEMENTS
OFF-LINE DRIVERS
C-D WELD CONTROLLER
DESCRIPTION
The SA13 is a half bridge pulse width modulation amplifier
that can supply 3000W to the load. Flexible frequency control
is provided. An internal 45kHz oscillator requires no external
components and can be used to synchronize multiple ampli-
fiers. The oscillator output may be divided down and con-
nected to the clock input to lower the switching frequency . The
clock input stage divides by two and determines the output
switching rate (normally 22.5 kHz). A shutdown input turns off
both output drivers. High side current sensing protects the
amplifier from shorts to ground. In addition, the half bridge
output MOSFETs are protected from thermal overloads by
directly sensing the temperature of the die. The 12-pin her-
metic MO-127 power package occupies only 3 square inches
of board space.
BLOCK DIAGRAM AND TYPICAL APPLICATION
PROGRAMMABLE POWER SUPPLY
EXTERNAL CONNECTIONS
TOP
VIEW
CLK IN
CLK OUT
+PWM
PWM/RAMP
SIG GND
SHDN
NC
NC
+VS
VCC
*
*
OUT
PWR GND
1
2
3
4
5
6
12
11
10
9
8
7
TOP
VIEW
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 OUT = HIGH.
*See text.
H T T P : / / W W W . A P E X M I C R O T E C H . C O M ( 8 0 0 ) 5 4 6 - A P E X ( 8 0 0 ) 5 4 6 - 2 7 3 9
M I C R O T E C H N O L O G Y
PULSE WIDTH MODULATION AMPLIFIER
SA13
APEX MICROTECHNOLOGY CORPORATION 5980 NORTH SHANNON ROAD TUCSON, ARIZONA 85741 USA APPLICATIONS HOTLINE: 1 (800) 546-2739
ABSOLUTE MAXIMUM RATINGS
SPECIFICATIONS
SA13
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +V
S
100V
SUPPLY VOLTAGE, V
CC
16V
POWER DISSIPATION, internal
150W
TEMPERATURE, pin solder - 10s
300
C
TEMPERATURE, junction
2
150
C
TEMPERATURE, storage
65 to +150
C
OPERATING TEMPERATURE RANGE, case
55 to +125
C
INPUT VOLTAGE, +PWM
0 to +11V
INPUT VOLTAGE, PWM
0 to +11V
INPUT VOLTAGE, I
LIM
0 to +10V
The SA13 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.
CAUTION
NOTES: 1.
Each of the two output transistors can dissipate 150W.
2.
Unless otherwise noted: T
C
= 25
C, V
S
, V
CC
at typical specification.
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.
5.
If 100% duty cycle is not required V
S(MIN)
= 0V.
SPECIFICATIONS
PARAMETER
TEST CONDITIONS
2
MIN
TYP
MAX
UNITS
CLOCK (CLK)
CLK OUT, high level
4
I
OUT
1mA
4.8
5.3
V
CLK OUT, low level
4
I
OUT
1mA
0
.4
V
FREQUENCY
44
45
46
kHz
RAMP, center voltage
5
V
RAMP, P-P voltage
4
V
CLK IN, low level
4
0
.9
V
CLK IN, high level
4
3.7
5.4
V
OUTPUT
R
ON
Each output driver
.08
EFFICIENCY, 10A output
V
S
= 100V
97
%
SWITCHING FREQUENCY
OSC in
2
22.05
22.5
22.95
kHz
CURRENT, continuous
4
60
C case
30
A
CURRENT, peak
4
40
A
POWER SUPPLY
VOLTAGE, V
S
Full temperature range
16
5
60
100
V
VOLTAGE, V
CC
Full temperature range
14
15
16
V
CURRENT, V
CC
I
OUT
= 0
80
mA
CURRENT, V
CC,
shutdown
50
mA
CURRENT, V
S
No Load
50
mA
I
LIM
/SHUTDOWN
TRIP POINT
90
110
mV
INPUT CURRENT
100
nA
THERMAL
3
RESISTANCE, junction to case
Full temperature range, for each die
.83
C/W
RESISTANCE, junction to air
Full temperature range
12
C/W
TEMPERATURE RANGE, case
Meets full range specifications
25
+85
C
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
TYPICAL PERFORMANCE
GRAPHS
SA13
50 25
0
25
50
75
100 125
80
85
90
95
100
105
110
115
Vcc QUIESCENT CURRENT
NORMALIZED Vcc QUIESCENT CURRENT, (%)
1M
100K
95
98
99
100
CLOCK LOADING
96
97
10K
NORMALIZED FREQUENCY, (%)
CASE TEMPERATURE, (
C)
CLOCK LOAD RESISTANCE, (
)
0.6
SOURCE TO DRAIN DIODE VOLTAGE
10
REVERSE DIODE
FLYBACK CURRENT, Isd (A)
5
6
7
8
3
2
2
3
4
5
6
7
9
1
25
50
75
100
125
150
24
26
28
30
CONTINUOUS OUTPUT
22
0.8
1.0
1.2
1.4
1.6
5
0
20
40
60
80
100
25
10
15
20
CASE TEMPERATURE, (
C)
CONTINUOUS AMPS
16
18
20
0
75
100
CASE TEMPERATURE, (
C)
0
POWER DERATING
150
25
DUTY CYCLE VS ANALOG INPUT
DUTY CYCLE, (%)
50
125
25
50
75
100
125
0
20
40
60
80
100
INTERNAL POWER DISSIPATION, (W)
ANALOG INPUT, (V)
3
5
4
7
6
SWITCHING FREQUENCY, F (kHz)
Vs, (V)
75
80
85
90
100
95
Vcc QUIESCENT CURRENT
NORMALIZED Vcc QUIESCENT CURRENT, (%)
20
40
60
80
100
120
140
160
180
Vs QUIESCENT VS VOLTAGE
5
25
SWITCHING FREQUENCY, F (kHz)
40
50
60
70
80
90
Vs QUIESCENT VS FREQUENCY
NORMALIZED Vs QUIESCENT CURRENT, (%)
NORMALIZED Vs QUIESCENT CURRENT, (%)
100
10
15
20
125
C
55
C
F NOMINAL = 45kHz
Vcc = 15V
F = 22.5 kHz
NORMAL
OPERATION
SHUTDOWN
OPERATION
Vs = 60V, NO LOAD
0
5
10
15
20
25
30
OUTPUT CURRENT, (A)
0
1
2
3
4
5
TOTAL VOLTAGE DROP
TOTAL VOLTAGE DROP, (V)
125
C
100
C
85
C
60
C
25
C
25
C
55
C
CASE TEMPERATURE
EACH OUTPUT TRANSISTOR
50
CASE TEMPERATURE, (
C)
CLOCK FREQUENCY OVER TEMP
NORMALIZED FREQUENCY, (%)
25
0
25
50
75 100 125
98.0
98.5
99.0
99.5
100
100.5
101.0
101.5
102.0
An external shutdown command can be mixed with the
protection circuit of Figure A. In figure B a 5V shutdown
command signal is divided down by R
2
, R
1
to the 100 mV
threshold level of the SHDN pin of the SA13. As long as the
shutdown command remains high both output transistors will
remain off.
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 1
F ceramic
capacitor in parallel with another low ESR capacitor of at least
10
F per amp of output current. Capacitor types rated for
switching applications are the only types that should be consid-
ered. 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 .1
F to .47
F ceramic
capacitor connected directly to the Vcc pin will suffice.
STARTUP CONDITIONS
The high side of the all N channel output half bridge circuit
is driven by a bootstrap circuit and charge pump arrangement.
In order for the circuit to produce a 100% duty cycle indefinitely
the low side transistor must have previously been in the ON
condition. This means, in turn, that if the input signal to the
SA13 at startup is demanding a 100% duty cycle, the output
may not follow the command and may be in a tri-state condi-
tion. 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.
OPERATING
CONSIDERATIONS
SA13
GENERAL
Helpful information about power supplies, heatsinking and
mounting can be found in the "General Operating Consider-
ations" section of the Apex data book. For information on the
package outline, heatsinks, and mounting hardware see the
"Package Outlines" and "Accessories" section of the data
book. Also see Application Note 30 on "PWM Basics."
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 half bridge driver may be accessed via the pwm input
comparator. When +PWM < -PWM then OUT is HIGH. A
motion control processor which generates the pwm signal can
drive these pins with signals referenced to SIG GND.
PROTECTION CIRCUITS
A high side current monitor will latch off the output transistors
when the high side current rises to approximately 150% of
rated output. The temperature of the output transistors is also
monitored. When either of the output transistors reaches
approximately 165
C both are latched off. In either case, it will
be necessary to remove the fault condition and recycle power
to Vcc to restart the circuit. A short to +Vs can be protected
against by inserting a sensing resistor into the PWR GND
circuit as shown in Figure A.
In Figure A, the sense resistor inserted into the PWR GND
connection is tied to the SHDN pin. When the current from a
short to +Vs develops 100 mV across the sense resistor the
shutdown circuit will shut off the output transistors for the
remainder of the switching cycle. The SA13 will restart at the
beginning of a new cycle and retest for this condition. This
circuit does not test for shorts to ground. The RC circuit R
1,
C
1
filters out any switching spikes and may need to be adjusted to
ignore normal current spikes in the application circuit.
PWR GND
SHDN
R
SENSE
FIGURE A. PROTECTING AGAINST SHORTS TO +Vs.
R1
C1
PWR GND
SHDN
R
SENSE
SHUTDOWN
SIGNAL
FIGURE B. ADDING SHUTDOWN CONTROL.
C1
R1
R2
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.
SA13U REV. D MARCH 1999
1999 Apex Microtechnology Corp.
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