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MSA260 Schematic ( PDF Datasheet ) - APEX MICROTECHNOLOGY

Teilenummer MSA260
Beschreibung Pulse Width Modulation Amplifier
Hersteller APEX MICROTECHNOLOGY
Logo APEX MICROTECHNOLOGY Logo 




Gesamt 8 Seiten
MSA260 Datasheet, Funktion
P r o d u c t IInnnnoovvaa t i o n FFr roomm
MSMAS2A62600
Pulse Width Modulation Amplifier
FEATURES
• LOW COST
• HIGH VOLTAGE - 450 VOLTS
• HIGH OUTPUT CURRENT - 20 AMPS
• 9kW OUTPUT CAPABILITY
• VARIABLE SWITCHING FREQUENCY
• IGBT FULL BRIDGE OUTPUT
APPLICATIONS
• BRUSH MOTOR CONTROL
• MRI
• MAGNETIC BEARINGS
• CLASS D SWITCHMODE AMPLIFIER
General Description
The MSA260 is a surface mount constructed PWM
amplifier that provides a cost effective solution in many
industrial applications. The MSA260 offers outstand-
ing performance that rivals many much more expen-
sive hybrid components. The MSA260 is a complete
PWM amplifier including an oscillator, comparator, er-
ror amplifier, current limit comparators, 5V reference,
a smart controller and a full bridge IGBT output circuit.
The switching frequency is user programmable up to
50 kHz. The MSA260 is built on a thermally conductive
but electrically insulating substrate that can be mount-
ed to a heatsink.
Equivalent Circuit Diagram
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MSA260U
http://www.cirrus.com
Copyrig( Ahtll©RiCghirtrsu sRLeosgeircv,eIdn)c. 2008
NOV 2008
APEX − MSA260UREVC
Datasheet pdf - http://www.DataSheet4U.co.kr/






MSA260 Datasheet, Funktion
MSA260
Product Innova tionFrom
OSCILLATOR
The MSA260 includes a user frequency programmable oscillator. The oscillator determines the switching frequency
of the amplifier. The switching frequency of the amplifier is 1/2 the oscillator frequency. Two resistor values must
be chosen to properly program the switching frequency of the amplifier. One resistor, ROSC, sets the oscillator fre-
quency. The other resistor, RRAMP, sets the ramp amplitude. In all cases the ramp voltage will oscillate between 1.5V
and 3.5V. See Figure 1. If an external oscillator is applied use the equations to calculate RRAMP .
To program the oscillator, ROSC is given by:
18.".1-*'*&3
ROSC = (1.32X108 / F) - 2680
where F is the desired switching frequency and:
RRAMP = 2 X ROSC
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Use 1% resistors with 100ppm drift (RN55C type resistors,
for example). Maximum switching frequency is 50kHz.
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Example:
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If the desired switching frequency is 22kHz then ROSC = 74)%/
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3.32K and RRAMP = 6.64K. Choose the closest standard 1% 4*(/"-
values: ROSC = 3.32K and RRAMP = 6.65K or simply use two
of selected ROSC in series for RRAMP.
FIGURE 1. EXTERNAL OSCILLATOR CONNECTIONS
SHUTDOWN
The MSA260 output stage can be turned off with a shutdown command volt-
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age applied to Pin 10 as shown in Figure 2. The shutdown signal is OR’ed
with the current limit signal and simply overrides it. As long as the shutdown

  

signal remains high the output will be off.
www.DataSheet.net/
CURRENT SENSING
The low side drive transistors of the MSA260 are brought out for sensing the
current in each half bridge. A resistor from each sense line to PWR GND (pin
18.".1-*'*&3
58) develops the current sense voltage. Choose R and C such that the time FIGURE 2. CURRENT LIMIT WITH
constant is equal to 10 periods of the selected switching frequency. The in- OPTIONAL SHUTDOWN
ternal current limit comparators trip at 200mV. Therefore, current limit occurs
at I = 0.2/RSENSE for each half bridge. See Figure 2. Accurate milliohm power resistors are required and there are
several sources for these listed in the Accessories Vendors section of the Databook.
POWER SUPPLY BYPASSING
Bypass capacitors to power supply terminals +VS must be connected physically close to the pins to prevent local
parasitic oscillation and overshoot. All +VS must be connected together. Place and electrolytic capacitor of at least
10µF per output amp required midpoint between these sets of pins. In addition place a ceramic capacitor 1.0µF or
greater directly at each set of pins for high frequency bypassing. VCC is bypassed internally.
GROUNDING AND PCB LAYOUT
Switching amplifiers combine millivolt level analog signals and large amplitude switching voltages and currents with
fast rise times. As such grounding is crucial. Use a single point ground at SIG GND (pin 26). Connect signal ground
pins 2 and 18 directly to the single point ground on pin 26. Connect the digital return pin 23 directly to pin 26 as well.
Connect PWR GND pin 58 also to pin 26. Connect AC BACKPLATE pin 28 also to the single point ground at pin 26.
Connect the ground terminal of the VCC supply directly to pin 26 as well. Make sure no current from the load return
to PWR GND flows in the analog signal ground. Make sure that the power portion of the PCB layout does not pass
over low-level analog signal traces on the opposite side of the PCB. Capacitive coupling through the PCB may inject
switching voltages into the analog signal path. Further, make sure that the power side of the PCB layout does not
come close to the analog signal side. Fast rising output signal can couple through the trace-to-trace capacitance on
the same side of the PCB.
 MSA260U
Datasheet pdf - http://www.DataSheet4U.co.kr/

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