SA12 Datasheet, PDF (1/5 Pages) Cirrus Logic – PULSE WIDTH MODULATION AMPLIFIERS

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Pulse Width Modulation Amplifiers
SAS1A122
FEATURE
• HIGH FREQUENCY SWITCHING — 200 kHz
• WIDE SUPPLY RANGE—16-200V
• 15A CONTINUOUS TO 65°C case
• 3 PROTECTION CIRCUITS
• ANALOG OR DIGITAL INPUTS
• SYNCHRONIZED OR EXTERNAL OSCILLATOR
• FLEXIBLE FREQUENCY CONTROL
APPLICATIONS
• 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
The SA12 is a pulse width modulation amplifier that can
supply 3000W to the load. An internal 400kHz oscillator re-
quires no external components. The clock input stage divides
the oscillator frequency by two, which provides the 200 kHz
switching frequency. External oscillators may also be used to
lower the switching frequency or to synchronize multiple ampli-
fiers. Current sensing is provided for each half of the H-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
TORQUE MOTOR DRIVER
Vcc 10
+PWM
3
–PWM/RAMP 4
100pF _28K
CLK OUT
2
OSC
÷2
CONTROL
SIGNAL
5V
CLK IN ₁
GND 5
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.
*See text. As +PWM goes more positive, A OUT duty cycle
increases.
CURRENT
LIMIT
PWM
OUTPUT
DRIVERS
SHUTDOWN
CONTROL
9 +VS
B OUT
8
A OUT
11
MOTOR
I SENSE A
12
ILIM/SHDN
6
7 ^{I SENSE B}
1K
5K
.01μF
RSENSE
1K
RSENSE
SA12_hU_{ttp://www.cirrus.com}
5V
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009₁
APEX − SA12UREVH