SA08 Datasheet, PDF (1/5 Pages) Cirrus Logic – PULSE WIDTH MODULATION AMPLIFIERS

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SAS0A088
Pulse Width Modulation Amplifiers
FEATURES
• IGBT OUTPUTS
• WIDE SUPPLY RANGE—16-450V
• 20A TO 100°C case
• 3 PROTECTION CIRCUITS
• SYNCHRONIZED OR EXTERNAL OSCILLATOR
• FLEXIBLE FREQUENCY CONTROL
APPLICATIONS
• MOTORS
• REACTIVE LOADS
• MAGNETIC BEARINGS
• LARGE PIEZO ELEMENTS
• OFF-LINE DRIVERS
• C-D WELD CONTROLLER
EXTERNAL CONNECTIONS
12-pin Power DIP
PACKAGE STYLE CR
DESCRIPTION
The SA08 is a pulse width modulation amplifier that can
supply 9KW to the load. An internal oscillator requires no
external components. The clock input stage divides the oscil-
lator frequency by two, which provides the switching frequency
of 22.5 kHz. The oscillator may also be used 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 IGBTs 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
MOTOR TORQUE CONTROL
Vcc
10
+PWM
3
4
FLAG
470pF
45K
CONTROL
SIGNAL
5V
CLK OUT
2
OSC
÷2
CLK IN
1
5
GND
CLK IN
CLK OUT
+PWM
FLAG
GND
ILIM/SHDN
1
12
2
11
3
TOP
10
4
VIEW
9
5
8
6
7
ISENSE A
A OUT
* _VCC
*
+VS
B OUT
I SENSE B
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.
*See text. As +PWM goes more positive, A OUT duty cycle
increases.
CURRENT
LIMIT
PWM
OUTPUT
DRIVERS
SHUTDOWN
CONTROL
9
+V_S
B OUT
8
11
A OUT
I SENSE A
12
6
ILIM/SHDN
7
I SENSE B
MOTOR
1K
5K
.01µF
RSENSE
1K
RSENSE
5V
SA08_hU_{ttp://www.cirrus.com}
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009₁
APEX − SA08UREVF