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Data Sheet rev 0.2 IRCS2277S
IRCS2277S Demo Board
For 3-phase / 380V motor drives
IRCS2277S Demo Board
* * * * * * * *
Up to 1200V DC-bus capability IR2277S device connected for 3-phase current sensing Open drain PWM output (PO) Open drain Over Current output (OC) Ratiometric analog output for A/D converters compatibility On-board disconnectable 5V reference On-board bootstrap supply for high-side gate drive Same board can host IR2177S or IR22771S or IR21771S, in place of IR2277S
IRCS2277S Demo Board (Shown above not including IRMD22381Q demo board)
Stacked boards compatibility
* *
Connectable on top of IRMD2214SS and IRMD22141SS demo boards Connectable on top of 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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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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Data Sheet rev 0.2 IRCS2277S
Parameters Input Power VCC VSS ICC Control Inputs/Outputs 40 pin connector J1 I/Os
Values
Description, condition Low voltage power supply. Follow IR2277S data sheet for supply setting Low voltage ground quiescent VCC current see "Board Connectors" section on page 4
15V typ ground 25 mA (max)
3.3V to 15V compatible
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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Data Sheet rev 0.2 IRCS2277S Board Connectors
P4 P8
P12 J1
J2
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
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
1
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
8 10 12 16 18 20 24 28
OUTU OCU POU VRH VSS VSS SYNC OCV
OUTU OCU POU VRH VSS VSS SYNC OCV
7 9 11 15 17 19 23 27
3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
VRL OUTV VSS VSS OUTW POV
13 15 17 19 21
14 16 18 20 22
VRL OUTV VSS VSS OUTW POV
27
28
POW VCC VCC
35 37 39
36 38 40
OCW VCC VCC
OCW VCC VCC
35 37 39
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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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 VSS (a) OCx (b)
10k
Yellow
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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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 3
2 3
CONNECTOR P8 SHV+ 1 (motor side) SHV2 (power module side) V SHW+ (motor side) SHW(power module side) W 3 CONNECTOR P12 1
1 2 3
1
2 3
2 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 U, CH2 V, CH3 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 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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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
Oscilloscope
High Voltage supply
Vcc Vdd
Vss gnd
DC-
DC+
Controller board
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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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* D boot
VCC
VB
C boot* + C boot**
15V
C VCC
IR2277S
R boot**
Phase
VS
VSS
Figure 4: Bootstrap circuit
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Data Sheet rev 0.2 IRCS2277S
The following table shows the names of these components on board. U CVCC Cboot* Cboot** Rboot* Rboot** C5 C7 C8 R6 R9 V C12 C15 C14 R13 R16 W 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 VB
15V
CVCC
VINP VINM VS
Rboot**
Phase
Rvinp Rvinm Shunt
VSS
Clamping structure with zener diode
Figure 5: undershoot clamp May 5th, 2005
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Data Sheet rev 0.2 IRCS2277S
The following table shows the names of these components on board. U VS DIODE VS ZENER VINM DIODE VINM ZENER VINP DIODE VINP ZENER RVINP RVINM D4 Z3 D3 Z2 D2 Z1 R7 R8 V D8 Z6 D7 Z5 D6 Z4 R14 R15 W 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
CVCC CD CCP
15V
VINM VS
CCM
Rboot**
Phase
Rvinp Rvinm Shunt
VSS
Figure 6: VIN filter The following table shows the names of these components on board. U CCP CCM RD C9 C10 Use C9 and C10 pads V C16 C17 Use C16 and C17 pads W C23 C24 Use C23 and C24 pads
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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. U CFILTER C4 V C11 W C18
VRL is shorted to local VSS by 0 Ohm resistors as follows: U RVRL R5 V R12 W 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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