IRF IRCS2277S

Data Sheet rev 0.2
IRCS2277S
IRCS2277S Demo Board
For 3-phase / 380V motor drives
IRCS2277S Demo Board
•
•
Up to 1200V DC-bus capability
•
•
•
Open drain PWM output (PO)
IR2277S device connected for 3-phase
current sensing
Open drain Over Current output (OC)
Ratiometric analog output for A/D
converters compatibility
•
•
On-board disconnectable 5V reference
•
Same board can host IR2177S or
IR22771S or IR21771S, in place of
IR2277S
On-board bootstrap supply for high-side
gate drive
Stacked boards compatibility
•
Connectable on top of IRMD2214SS and
IRMD22141SS demo boards
•
Connectable on top of IRMD22381Q demo
board
IRCS2277S Demo Board
(Shown above not including IRMD22381Q demo board)
Introduction
The IRCS2277S demo board is an evaluation board for IR2277S current sensor (see device data sheet for details).
IRCS2277S is designed to read 3-phase motor currents on top of pin-out compatible gate driver boards. The board can
be used for both AC and Brushless motors current sensing by reading the voltage developed on shunt resistors. The
board is a flexible solution for different applications and can be customized by means reconfigurable components
options. Three-phase shunt resistor (with sensing pins) must be placed in the gate driver board. Both PWM and
ratiometric analog outputs are provided for all of the three phases. Both PWM output and Over Current signal are
provided as open collector outputs. Board layout has been studied to reduce noise coupling between high and low
voltage signals.
Application Block Diagram
(Refer to connections section to see
interface pins) This diagram shows
the main blocks and connections of
the demo board and the external
components necessary in a typical
motor drive application.
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page 1/20
May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
Table of contents
INTRODUCTION ...............................................................................................................................................1
Table of contents............................................................................................................................................2
Table of figures ..............................................................................................................................................2
The IR2277S ..................................................................................................................................................3
The stacked structure of HVIC demo boards.................................................................................................3
Important Notice.............................................................................................................................................3
BOARD CONNECTORS ...................................................................................................................................4
Connection with the system controller ...........................................................................................................4
VRL, VRH, OUTU, OUTV, OUTW ........................................................................................................................5
VCC supply pin ................................................................................................................................................5
VSS ground pin (GND) ....................................................................................................................................5
Connecting the current sensors .....................................................................................................................6
Test Points .....................................................................................................................................................6
TEST BENCH CONNECTION ..........................................................................................................................7
OPERATING DESCRIPTION............................................................................................................................8
Normal operating mode .................................................................................................................................8
Precharge of the bootstrapped sections ........................................................................................................8
BOARD CUSTOMIZATION...............................................................................................................................8
Bootstrap circuit .............................................................................................................................................8
G0 and G1 selection ......................................................................................................................................9
OTHER EXTRA COMPONENTS ......................................................................................................................9
Clamping Diode for Vs below ground ............................................................................................................9
RC filter on VINP and VINM .............................................................................................................................10
Analog output OUT ......................................................................................................................................11
Auto-reset function .......................................................................................................................................11
BILL OF MATERIAL .......................................................................................................................................12
LAYOUT ..........................................................................................................................................................14
Table of figures
Figure 1: BOTTOM and TOP image with connectors........................................................................................4
Figure 2: LED connection ..................................................................................................................................5
Figure 3: Test bench connection .......................................................................................................................7
Figure 4: Bootstrap circuit..................................................................................................................................8
Figure 5: undershoot clamp...............................................................................................................................9
Figure 6: Vin filter.............................................................................................................................................10
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May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
Parameters
Values
Description, condition
Input Power
VCC
15V typ
VSS
ICC
ground
25 mA (max)
Low voltage power supply.
Follow IR2277S data sheet for
supply setting
Low voltage ground
quiescent VCC current
Control Inputs/Outputs
40 pin connector J1 I/Os
3.3V to 15V compatible
see “Board Connectors” section
on page 4
The IR2277S
The IR2277S is a high voltage current sensor, best suited for AC motor drive applications. An integrated
adaptive filter provides superior ripple rejection on phase current measurement being synchronous with
PWM carrier (SYNC input). A ratiometric analog output is provided by each device to the controller in a
range that can be set through VRH and VRL pins. PWM open collector outputs are also provided for those
controllers which do not use A/D converters for current measurement. Over current detection is also
available via open collector OC pins.
For further technical information see the IR2277S data sheet at http://www.irf.com.
The stacked structure of HVIC demo boards
IRCS2277S demo board is fully compatible with
standard pin out of IRMD2214xSS and
IRMD22381Q demo boards.
The HVIC demo boards are structured to work
together on top of an ECONO2 power module or
a PowerPCB.
Important Notice
IRCS2277S demo board is supplied with a tentative Bill of Material suitable for a generic 380V generic 3phase motor drive application. The BOM presented on page 12 provides just a suggestion.
It is strongly recommended to customize the demo board to fit the application requirements for the power
level that has been chosen.
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page 3/20
May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
Board Connectors
P4
P8
P12
J2
J1
Figure 1: BOTTOM and TOP image with connectors
Connection with the system controller
On board there is a 40 pins connector for the control signals. The current sense board uses 26 pins. The
remaining pins are for the sensing board (IRCS2277S) that can be connected on top of IRMD22381Q board.
Table 1: 40-pin connector J2 and J1
VRL
OUTV
VSS
VSS
OUTW
POV
POW
VCC
VCC
13
15
17
19
21
27
35
37
39
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
8
10
12
OUTU
OCU
POU
OUTU
OCU
POU
7
9
11
16
18
20
VRH
VSS
VSS
VRH
VSS
VSS
15
17
19
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
32
31
32
33
34
33
34
35
36
35
36
37
38
37
38
39
40
39
40
24
28
36
38
40
SYNC
OCV
OCW
VCC
VCC
SYNC
OCV
OCW
VCC
VCC
23
27
35
37
39
14
16
18
20
22
VRL
OUTV
VSS
VSS
OUTW
28
POV
36
38
40
POW
VCC
VCC
Logical signals SYNC, POU, POV, POW, OCU, OCV, OCW
SYNC and POx logic inputs are 5V and 3.3 V compatible CMOS I/O ports. SYNC input must be a 50% dutycycle square wave that provides filter synchronization with PWM carrier. POx as an input is used for over
current reset when auto-reset function is disabled. As an opened drain output, POx is pull-up with a resistor
to 15V supply. OCx open drain output is also pulled-up to 15V supply. Both pull-up resistors can be removed
in order to use a different supply provided in the controller board. OCx pins are connected to a yellow led
(see Figure 2) indicating the overcurrent condition of the respective current sensor. This led will be disabled
when connecting OCx to a different pull-up.
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May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
VRL, VRH, OUTU, OUTV, OUTW
VRL and VRH inputs are the reference voltages for the OUTx analog output of the current sensors.
VRL is the low voltage rail for OUTx and it is connected to VSS by a 0 Ohm resistor. VRH is the high voltage
rail for OUTx and it is connected to a linear 5V regulator by a 0Ohm resistor.
Both VRH and VRL can be disconnected to the respective supplies (VSS and 5V regulator) in order to be
supplied by the controller board.
OUTx are directly connected to the IR2277S devices output.
Note: further information about IR2277S I/Os are described in details in IR2277S data sheet.
VCC supply pin
This is the supply pin for all the devices. On board a green LED indicates the supply power on; Figure 2b
shows the connection.
15V
VCC
Green
10k
Yellow
10k
VSS
OCx
(a)
(b)
Figure 2: LED connection
VSS ground pin (GND)
When stacked together, the board ground is shared among the stack. Gate drivers board share the VSS with
DC- (power ground) with a star connection on DC-.
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May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
Connecting the current sensors
P1, P2 and P3 are connected with the optional shunt resistors placed on the driver board between the
phase output nodes and the motor.
CONNECTOR P4
SHU+
(motor side)
SHU(power module side)
U
1
1
2
2
3
3
CONNECTOR P8
SHV+
1
(motor side)
SHV2
(power module side)
V
1
2
3
3
CONNECTOR P12
SHW+
(motor side)
SHW(power module side)
W
1
1
2
2
3
3
Table 2: P4, P8 and P12 connectors for Kelvin contacts to shunt signals
SHU, SHV and SHW are sense pins connected to the shunt resistors terminals.
Test Points
Test points on board provide signals that are not available at the connectors. See the following table:
ONE FOR EACH CHANNEL
(CH1 Æ U, CH2 Æ V, CH3 Æ W)
VBu,v,w
VSu,v,w
VINPu,v,w
VINMu,v,w
OUTu,v,w
POu,v,w
OCu,v,w
GNDu,v,w
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High side floating supply voltage
High side floating supply offset voltage (jumper)
Current sensor positive input
Current sensor negative input
Analog output
PWM output
Overcurrent output
Local ground (VSS)
Table 3: Test points
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May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
Test Bench connection
IRMD2277S does NOT provide opto isolation.
The following picture shows the recommended connections for board evaluation. Bold lines are equipotential
(DC-=Vss=gnd).
Low Voltage
supply
Vcc
Vdd
High Voltage
supply
Oscilloscope
Vss
gnd
DC-
Controller
board
DC+
U
V
W
Flat cable or direct connection (preferred)
via female connector, to provide signals and
supply (VCC=15V typ)
Figure 3: Test bench connection
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page 7/20
May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
OPERATING DESCRIPTION
Normal operating mode
The IRCS2277S demo board has to be connected to a board equipped with shunt resistors to be operated
properly.
IRMD22381Q, IRMD2214SS and IRMD22141SS driver boards can be connected with the IRCS2277S
current sensing board through the 40-pin connector J2 and the 3-pin connectors P4, P8 and P12.
J1 reflects J2 connector bringing all the signals to the controller board.
More information is available with gate driver board data sheets.
Pre-charge of the bootstrapped sections
High voltage current sensor sections are supplied by bootstrap topology technique.
It’s recommended to pre-charge the bootstrap supplies before starting to drive the motor with the preferred
driving scheme.
BOARD Customization
This demo board is meant to be flexible for self-customization. Place for many spare components allow to
verify functionality of the current sensors under different external configurations.
This section will go through the possible customizations of the board.
Bootstrap circuit
The high side floating supply (VBS) is provided by a bootstrap capacitor. Figure 4 shows the circuit on board.
DC+
R boot*
VCC
D boot
VB
15V
IR2277S
C boot*
C VCC
+
C boot**
R boot**
Phase
VS
VSS
Figure 4: Bootstrap circuit
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page 8/20
May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
The following table shows the names of these components on board.
CVCC
Cboot*
Cboot**
Rboot*
Rboot**
U
V
W
C5
C7
C8
R6
R9
C12
C15
C14
R13
R16
C19
C22
C21
R20
R23
G0 and G1 selection
G0 and G1 gain selectors of each IR2277S device can be set by using P2, P3, P6, P7 and P10, P11
jumpers.
Other extra components
These components are provided to make IRMD2277S board as customizable as possible. In many cases
the use of the extra components is not necessary.
Clamping Diode for Vs below ground
This solution preserves the device when the VS, Vinp and Vinm pins go below ground out of the device
absolute maximum ratings. The pins voltage is clamped to the maximum value allowed by a zener diode.
DC+
VCC
15V
VB
VINP
VINM
CVCC
Rboot**
Phase
VS
Rvinp
Rvinm
VSS
Clamping
structure with
zener diode
Figure 5: undershoot clamp
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page 9/20
May 5th, 2005
Shunt
Data Sheet rev 0.2
IRCS2277S
The following table shows the names of these components on board.
VS DIODE
VS ZENER
VINM DIODE
VINM ZENER
VINP DIODE
VINP ZENER
RVINP
RVINM
U
V
W
D4
Z3
D3
Z2
D2
Z1
R7
R8
D8
Z6
D7
Z5
D6
Z4
R14
R15
D12
Z9
D11
Z8
D10
Z7
R21
R22
NOTE: It must be noticed that during bootstrap filling, voltage will be developed across Rboot**. It is important
in that case to evaluate the voltage difference between VS and VINP/VINM, that must stay in the maximum
operating condition specified by the data sheet of the IR2277S. Filter capacitors (see next par.) across
VINP/VINM and VS may help in staying in the specified voltage range,
RC filter on VINP and VINM
High frequency filter capacitors are located at VINP and VINM pins. They can be placed either in common
mode (across pins and VS) or in differential mode (between VINP and VINM).
DC+
VCC
VB
VINP
CD
CCP
15V
VINM
CVCC
Rboot**
VS
CCM
Phase
Rvinp
Rvinm
Shunt
VSS
Figure 6: VIN filter
The following table shows the names of these components on board.
CCP
CCM
RD
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U
V
W
C9
C10
Use C9
and C10
pads
C16
C17
Use C16
and C17
pads
C23
C24
Use C23
and C24
pads
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May 5th, 2005
Data Sheet rev 0.2
IRCS2277S
Analog output OUT
Analog outputs OUTU, OUTV and OUTW are provided to the 40-pin connector with a capacitor that is
connected to VRL as per the following table.
CFILTER
U
V
W
C4
C11
C18
VRL is shorted to local VSS by 0 Ohm resistors as follows:
RVRL
U
V
W
R5
R12
R19
To use a different voltage to supply the analog output low rail, disconnect these resistors.
VRH is shorted to a linear 5V regulator (7805) output. Remove the 0 Ohm resistor R2 to disconnect the
voltage regulator and provide the analog output high voltage rail via 40-pin connector.
The following table shows the names of these components on board.
Auto-reset function
To reset automatically IR2277 current sensors when they latch an overcurrent condition, short pin 1 to pin 2
of jumpers P1 (U1), P5 (U2) and P9 (U3).
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Data Sheet rev 0.2
IRCS2277S
Bill of material
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Data Sheet rev 0.2
IRCS2277S
SCHEMATIC
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Data Sheet rev 0.2
IRCS2277S
LAYOUT
TOP LAYER and measures
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Data Sheet rev 0.2
IRCS2277S
TOP LAYER
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Data Sheet rev 0.2
IRCS2277S
INT1 LAYER
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Data Sheet rev 0.2
IRCS2277S
INT2 LAYER
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Data Sheet rev 0.2
IRCS2277S
BOT LAYER
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Data Sheet rev 0.2
IRCS2277S
TOP SILK
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Data Sheet rev 0.2
IRCS2277S
BOT SILK
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