SA03 Datasheet, PDF (1/5 Pages) Cirrus Logic – PULSE WIDTH MODULATION AMPLIFIER

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SAS0A033
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
APPLICATIONS
• MOTORS TO 4HP
• REACTIVE LOADS
• LOW FREQUENCY SONAR
• LARGE PIEZO ELEMENTS
• OFF-LINE DRIVERS
• C-D WELD CONTROLLER
DESCRIPTION
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 fre-
quency 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 sup-
ply 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
CONTROL
SIGNAL
Vcc
10
+PWM
3
4
–PWM/RAMP
CLK OUT
2
CLK IN
1
5
GND
470pF _56K
OSC
÷2
SA03
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EXTERNAL CONNECTIONS
12-pin Power DIP
PACKAGE STYLE CR
CLK IN
CLK OUT
+PWM
–PWM/RAMP
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.
If +PWM > RAMP/–PWM then A OUT > B OUT.
* See text.
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
SA03_hU_{ttp://www.cirrus.com}
5V
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009₁
APEX − SA03UREVH