Silicon Laboratories si85xx User's Manual
Contents
1. Si85xx TB UG SILICON LABS Si85XX UNIDIRECTIONAL AC CURRENT SENSOR TARGET BOARD USER S GUIDE The Si85xx products are unidirectional ac current sensors available with full scale current sense input ranges of 5 10 and 20 A Si85xx products are ideal upgrades for older current sensing technologies offering size performance and cost advantages over current transformers Hall Effect devices DCR circuits and other approaches The Si85xx are extremely low loss adding less than 1 3 mQ of series resistance and less than 2 nH series inductance in the sensing path at 25 C Current sensing terminals are isolated from the other package pins to a maximum voltage of 1 000 VDC 1 Kit Contents The Si85xx Unidirectional AC Current Sensor Development Kit contains the following items m 10 Amp Si8512 based evaluation board m Si85xx Unidirectional AC Current Sensor Target Board User s Guide this document 2 Hardware Overview The Si85xx Target Board Si85xx TB see Figure 1 provides a means to evaluate the ac current sensor in an existing application It is meant to be soldered directly into the users existing power supply The board comes with the Si8512 installed and provides a 10 Amp full scale input sense range and a 2 0 V full scale output voltage For more details on the Si8512 refer to the Si85xx Data Sheet GROUND Figure 1 Si85xx TB Overview Rev 0 1 6 07 Copyright 2007 by Silicon Laboratories Si85xx TB UG Si85xx TB2. 0CCT ND Digi Key DNP 11 1 U1 i8512 IS Digi Key Si851x e 6 Confidential Rev 0 1 SILICON LABS S i85xx TB UG NOTES Confidential Rev 0 1 SILICON LABS Si85xx TB UG CONTACT INFORMATION Silicon Laboratories Inc 400 West Cesar Chavez Austin TX 78701 Tel 1 512 416 8500 Fax 1 512 416 9669 Toll Free 1 877 444 3032 Email PowerProducts silabs com Internet www silabs com The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice Silicon Laboratories assumes no responsibility for errors and omissions and disclaims responsibility for any consequences resulting from the use of information included herein Additionally Silicon Laboratories assumes no responsibility for the functioning of undescribed features or parameters Silicon Laboratories reserves the right to make changes without further notice Silicon Laboratories makes no warranty rep resentation or guarantee regarding the suitability of its products for any particular purpose nor does Silicon Laboratories assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation conse quential or incidental damages Silicon Laboratories products are not designed intended or authorized for use in applications intended to support or sustain life or for any other application in w
3. Supply Input power connection 5 V 100 mA m J2 GND Input Supply power return connection 0 V m J3 HDR 2X2 Mode Control input m J4 HDR 2X07 R1 R2 R3 R4 inputs OUT1 OUT2 outputs and seven GND return pins m J5 IIN Positive Current Sense Input m J IOUT Negative return Current Sense Input a J7 HEADER TRST timing select jumper default tied to VDD Figure 4 Si85xx TB Layout 4 1 VIN J1 J2 The user provided power supply should be connected to connectors J1 and J2 where J2 is the reference The power source must be 5 V with at least 100 mA maximum output current Table 1 J1 J2 Pin Descriptions 4 2 Mode Pin J3 Connector J3 is the Mode Control header The user should tie this pin to either VDD or GND depending on their power supply Table 2 J3 Pin Descriptions Jumper Description J3 VDD or GND Confidential Rev 0 1 3 SILICON LABS Si85xx TB UG 4 3 R1 R2 R3 R4 Inputs OUT1 OUT2 Outputs J4 Connector J4 is used to provide the control inputs R1 R2 R3 R4 MODE to the Si85xx It also provides the output voltage of the sensed input current on OUT1 and OUT2 Table 3 J4 Pin Descriptions Jumper Description J4 R1 R2 R3 R4 OUT1 OUT2 GND 4 4 IIN J5 Connector J5 is used to provide the positive current sense input to the Si85xx device Table 4 J5 Pin Descriptions Jumper Description J5 IIN 4 5 IOUT J6 Connector J6 i
4. UG 3 Si85xx TB Hardwired to Single Phase POL Figure 2 illustrates the Si85xx TB soldered directly into a single phase POL The single phase POL was designed to operate at a 400 kHz switch rate and provide better than 90 percent efficiency It also provides 10 amps of peak current to the load and protects the supply by shutting down in the event of an over current condition Figure 2 Si85xx EVB Hardwired to Single phase POL Figure 3 illustrates the Si8512 accurately monitoring the POL s switching current As shown in the scope plot a 1 6 V peak output voltage accurately monitors the 8 Amp peak 50 percent duty cycle 400 kHz current signal of the POL A 20 mQ sense resistor in series with the Si85xx is also monitored via a differential probe to provide a base line measurement of the POL 20 mo Si8512 Sense Resistor Figure 3 Si85xx TB OUT1 Oscilloscope Plot To accommodate this test the Si85xx TB was powered with a 5 V 100 mA supply connected from J1 to J2 R1 was soldered from J4 to the respective phase control line of the POL R2 and R4 were jumped to GND on J4 R3 was tied to 5 V and the Mode pin was jumped to VDD via J7 2 Confidential Rev 0 1 SILICON LABS Si85xx TB UG 4 Si85xx Evaluation Board The Si85xx TB has a Si8512 installed Refer to Figure 4 for the locations of the various I O connectors and major components m J1 5 V
5. hich the failure of the Silicon Laboratories product could create a situation where per sonal injury or death may occur Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap plication Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages The sale of this product contains no licenses to Power One s intellectual property Contact Power One Inc for appropriate licenses Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders 8 Confidential Rev 0 1 SILICON LABS
6. s used to provide the negative return current sense input to the Si85xx device Table 5 J6 Pin Descriptions Jumper Description J6 IOUT 4 6 TRST RESET J7 Connector J7 is used to set the timing for the Si85xx s integrator J7 defaults to Reset option 1 where TRST is tied VDD providing approximately 200 ns of reset time Reset option 2 is selected by connecting a timing resistor R1 in Figure 4 from the TRST input to ground Table 6 J7 Pin Descriptions Jumper Description J7 TRST VDD or R1 to GND 4 Confidential Rev 0 1 SILICON LABS Si85xx TB UG 5 Schematic 2IeuledoS pJeog Jebel xxog s G aJn6lj XIl98IS n 5 LNOll or SPOW ON dnqjesg euzoN Do NII sr dno dno 9 LO oe ASA ASA go aNd go m Ir Confidential Rev 0 1 SILICON LABS Si85xx TB UG 6 Bill of Materials Table 7 Si825x Multi Phase POL Reference Design Bill of Materials Item Quantity Reference Part Number Manufacturer Description 1 1 C1 PCC2182CT ND Digi Key 10 uF 2 1 C2 PCC1812CT ND Digi Key 0 1 uF 3 1 J1 2551 2 00 44 00 00 07 0 Bisco 5V 4 1 J2 2551 2 00 44 00 00 07 0 Bisco GND 5 1 J3 2012 02 ND Digi Key HDR 2X2 6 1 J4 2012 07 ND Digi Key HDR 2X07 7 1 J5 2551 2 00 44 00 00 07 0 Bisco IIN 8 1 J6 2551 2 00 44 00 00 07 0 Bisco IIOUT 9 1 J7 1012 02 ND Digi Key HEADER 10 1 R1 P15
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