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参数资料
| 型号： | PIIPM25P12B008X |
| 厂商： | Vishay Semiconductors |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC PWR MODULE PROG ISO 25A 1200V |
| 标准包装： | 1 |
| 模块/板类型： | 编程器模块 |
| 适用于相关产品： | 伺服电机 |
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PIIPM25P12B008
I27147 02 - Oct
The “2406A” has three different serial interfaces
available: SCI, SPI, and CAN bus. In the PI-
IPM25P12B008 communication is made through
the asynchronous port (SCI) while four other
opto-isolated lines can be used for the SPI or for
the hall effect sensor interface. Maximum bit rate
for this asynchronous serial port is 2.5Mbps while
the SPI (synchronous) could reach 10Mbps. The
choice of the SCI has been taken for easy
interfacing with a standard computer serial port,
the only component needed is a line driver to
adapt the RS232 voltage standard with the RS422
at 3.3V used on this application.
In a standard Brushless motor application usually
1Mbps are far enough to transmit all information
needed for the torque reference updates and other
fault and feedback signals at a maximum frame
rate of 10kHz (100bits/frame), in this way the on-
board line driver let the application use long
connecting wires between the host and the
module, leaving the user the possibility of having
the PI-IPM displaced near the motor, e.g. in its
connecting box, thus avoiding long ad noisy three
phase cables between driver and load.
The JTAG port is the standard one, neither
isolation nor signal conditioning are provided
here and all signal, except the Tck-ret, are
directly connected from the related DSP pins to
the connector; however, due to the limited board
space, the connector used in not the standard 14
pins at two rows header, then an adaptor has to be
realized to connect it to the JTAG adapter
interface provided by Texas Instruments.
Last but not least is the ADC speed and load
characteristic: as the table shows the conversion
time is 500ns, in fact the 2406A DSP has a single
ADC handling, in time sharing, all 16 inputs,
then, using 6 inputs, the total conversion time,
which is a fixed delay to wait for before having
all data updated, is around 3.0 μ s.
2. Flyback Power Supply
A flyback power supply for the floating stages is
provided in the EDB. As the block schematic on
page 2 shows, we have three 15V outputs for the
floating stages, isolated from each other at 1.5kV
minimum, and a single 5V and 3.3V output.
www.irf.com
The 5V supplies all low voltage electronics and a
3.3V linear regulator is used to feed the DSP and
some analog and logic interfaces to it. This 5V
and 3.3V are directly referred to the DC bus
minus, so that all control circuitry is alternately at
one of the input lines potential, isolation is
provided at the DSP serial link level, then
avoiding all delays due to opto couplers insertion
between DSP and control logic. Note that also
the required 15V input voltage is referred to the
same DC bus minus and directly supplies the low
side gate drivers stages, the user should pay some
attention on how this supply line is realized in his
application. Just for completeness, the following
figure gives a possible solution to that that
doesn’t impact heavily on the user application.
Examples of power supply for PI-IPM
15V and 5V iso inputs
Normally a 5V power supply is already present,
for displays, electronics and micro processor, the
same 5V could be used for the 5V iso supply of
opto-couplers and line driver, the 15V could be
realized as an added winding in the secondary
side of the flyback transformer, the only care that
should be taken is in keeping its isolation from
the above mentioned 5V at the required level (at
least 1.5kV).
To avoid noise problems in the measuring lines
due to the commutating electronics during normal
functioning of the system, references are kept
separated. A 5V linear regulator, directly supplied
from the 15V input, is used to provide the
reference voltage to the current sensing
amplifying and conditioning components while a
precise op-amp, configured as a voltage follower,
acts as a buffer of the partition at 3.30V created
down the 5V reference. This 3.30V is used also
as reference for the DSP A/D converter. It has to
be noted that in the schematic we are using the
same linear regulator as a starting point for all
13
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