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SI85XX-EVB

P1-P3P4-P6P7-P9P10-P12
Rev. 0.4 8/10 Copyright © 2010 by Silicon Laboratories Si85xx Target Board User’s Guide
Si85xx Target Board User’s Guide
Si85
XX
U
NIDIRECTIONAL
AC C
URRENT
S
ENSOR
T
ARGET
B
OARD
U
SER
’
S
G
UIDE
1. Introduction
The Si85xx products are unidirectional ac current sensors available with full-scale current sense input ranges of 5,
10, and 20 Amps. 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 m 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,
providing 1000 V
RMS
of isolation with the 4x4x1 mm QFN package and 5000 V
RMS
of isolation with the wide-body,
20-pin SOIC package.
2. Kit Contents
The Si85xx Unidirectional AC Current Sensor Development Kit contains one of two versions of the 10 Amp,
Si8512-based evaluation board or one version of the 20 Amp Si8513 based evaluation board. See "8. Ordering
Guide" on page 10 for part number details for the 1 kV (QFN) or 5 kV (SOIC).
3. Hardware Overview
The Si85xx Target Boards shown in Figures 1, 2, and 3 provide a means of evaluating the ac current sensor in an
existing application. The boards are meant to be soldered directly into a user’s existing power supply and come
with either the Si8512 installed (10 Amp full-scale input range) or with the Si8513 installed (20 Amp full-scale input
range). For more information, refer to the Si85xx data sheet.
Figure 1. Si85xx-TB Overview (1 kV, 10 Amp Target Board)
Figure 2. Si85xx5kV-TB Overview (5 kV, 10 Amp Target Board)
Figure 3. Si85xx20AQFN-TB Overview (1 kV, 20 Amp Target Board)
Si85xx Target Board User’s Guide
2 Rev. 0.4
4. Target Board Hardwired to Single-Phase POL
Figure 4 illustrates the Si85xx-TB (1 kV, 10 Amp target board) soldered directly into a single-phase POL. The
single-phase POL is designed to operate at a 400 kHz switch rate and provides 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
overcurrent condition.
Figure 4. Si85xx-EVB Hardwired to Single-Phase POL (1 kV Target Board)
Figure 5 shows 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 m sense resistor in series with the Si85xx is also monitored via a differential probe to provide a baseline
measurement of the POL.
Figure 5. 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 V
DD
via J7.
Si8512
20 m
Sense Resistor
Si85xx Target Board User’s Guide
Rev. 0.4 3
5. Si85xx Evaluation Board
The boards come with either the Si8512 installed (10 Amp full-scale input range) or with the Si8513 installed
(20 Amp full-scale input range). Refer to Figures 6, 7, and 8 for the locations of the various I/O connectors and
major components. Note that 100 resistors were added in series to the R1 to R4 control lines on the 5 kV,
10 Amp target board and to the 20 Amp QFN target board to reduce inductive ringing from excessively long wires;
these are optional for the end-system design.
J1 5 V Supply Input power connection 5 V, 100 mA
J2 GND, Input Supply power return connection, 0 V
J3 HDR-2X2, Mode Control input
J4 HDR-2X7, R1, R2, R3, R4 inputs, OUT1, OUT2 outputs, and seven GND return pins
J5 IIN Positive Current Sense Input
J6 IOUT Negative/return Current Sense Input
J7 HEADER, TRST timing select jumper, default tied to VDD
Figure 6. Final Setup (1 kV, 10 Amp Target Board)
Figure 7. Final Setup (5 kV, 10 Amp Target Board)
Figure 8. Final Setup (1 kV, 20 Amp Target Board)
P1-P3P4-P6P7-P9P10-P12

SI85XX-EVB

Mfr. #:
Buy SI85XX-EVB
Manufacturer:
Silicon Labs
Description:
Current Sensor Development Tools 10A Current Sensor Evaluation Board
Lifecycle:
New from this manufacturer.
Delivery:
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