Silicon Laboratories Si8281-EVB Bedienungsanleitung

UG167: Si8281-EVB User's Guide

This document describes the operation of the Si8281-EVB.

The Si8281 Evaluation Kit contains the following items:

• Si8281-EVB

•Si8281CD-IS installed on the evaluation board.

KEY POINTS

• Discusses hardware overview and setup,

including:

• Si8281 low voltage side connections.

•DC-DC operation.

• Si8281 isolated gate drive connections.

• Offers alternative configurations.

• Demonstrates driver functionality.

• Shows Si8281-EVB schematics and

silkscreen/copper layout.

• Includes the bill of materials and ordering

guide.

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1. Overview and Setup

1.1 Hardware

Si8281-EVB can be used to demonstrate the isolated gate drive capabilities of the installed Si8281CD-IS. The Si8281 includes a DC-

DC converter used to supply isolated power to the gate driver.

Si8281 Low Voltage Side Connections

Supply power to the input side of Si8281 by applying 5.0 VDC to VIN at terminal block J1. LED D4 above terminal block J1 illuminates to

show power applied. A jumper must be installed at JP2 as VDDA is powered by the same supply as VIN.

J6–J10 single pin headers provide access to the IN+, IN–, RSTb inputs, and FLTb and RDY outputs of the Si8281. These signals can

be brought out to an external microcontroller using a ribbon cable (not supplied). FLTb is an open drain output and has a weak pull-up

resistor and LED D11 in series to VDDA. The open drain output allows multiple gate drivers' FLTb outputs to share the same microcon-

troller input.

Driver functionality can be exercised without microcontroller by applying a GNDA referenced PWM signal from a function generator to

the IN+ and IN– inputs. Maximum input voltage is VDDA.

DC-DC Operation

The isolated DC-DC converter is set to generate (with respect to VMID) 15 V for VDDB and –11 V for VSSB. LED D5 illuminates when

VDDB is powered. A jumper must be installed at JP1 to power VDDB from the DC-DC output.

Si8281 Isolated Gate Drive Connections

There are four different load options for Si8281 gate driver:

1. Through holes for a MOSFET or an IGBT in a TO-247 package (not supplied) at Q1.

2. Through holes for a MOSFET or an IGBT in a TO-220 package (not supplied) at Q2.

3. Through holes for a capacitor (not supplied) at C17.

4. Pads for a 1206-size surface mount capacitor (not supplied) at C11.

From top to bottom, the through holes for the transistor leads are Source, Drain, and Gate. Load transistors are biased by applying

voltage across VPWR and VMID terminals of J2. This voltage should not exceed the rated VDS of the transistor or 300 V, whichever is

lower. Supply voltage constraints are summarized in the table below.

Note: Si8281 can drive the gate of either high-side or low-side MOSFET or IGBT in a bridge configuration. When used as a high-side

gate driver, VMID is connected to the load. When used as a low-side gate driver, VMID is the return for the load.

For capacitive loads, capacitor value should be chosen to match the gate capacitance of the desired transistor. Supply voltage con-

straints are summarized in the table below.

Table 1.1. Supply Voltage Constraints

3.0 V ≤ VIN – GNDA = VDDA – GNDA ≤ 5.5 V

VSSB ≤ VMID < VDDB

UVLO+ < VDDB – VSSB < 30 V

VPWR < VDS (Q)

VPWR < 300 V

|GNDA – VSSB| < 5 kV

Note:

1. UVLO+ for the Si8281CD-IS is 12.3 V typically.

UG167: Si8281-EVB User's Guide

Overview and Setup

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1.2 Alternative Configurations

Positive Voltage Gate Drive Only

The standard configuration for the gate driver to apply positive voltage, VDDB–VMID, to the gate during the high drive portion of the

PWM cycle and negative voltage, VSSB–VMID, during the low drive portion of the PWM cycle. Alternatively, if only positive drive volt-

age is desired, remove R13 and install a 0 Ω resistor at R14.

Prototyping Area

If additional components are needed to evaluate the gate drive function for a particular load, there is a prototyping area just below Q2

locations.

1.3 Demonstrating Driver Functionality

Even with no load present, the basic functionality of the Si8281 can be demonstrated.

1. Ensure JP1 and JP2 have jumpers installed.

2. Apply 5 V to VIN to power both sides of the Si8281.

3. Short VPWR to VMID at J2 using a wire between the terminals of J2. This disables DSAT detection and allows for normal opera-

tion of the Si8281. Since both sides of Si8281 have been powered on, RDY will output 5 V, which can be observed at J8.

4. Apply 5 V to both J9, IN+ and J10, IN–. The Si8281 will drive low and –11 V can be observed across C17.

5. Apply 5 V to J9, IN+ and 0 V to J10, IN–. The Si8281 will drive high and 15 V can be observed across C17.

6. Remove the short between VPWR and VMID at J2.

7. With no path for DSAT current, the voltage at the DSAT pin rises and the Si8281 will drive the output low and pull FLTb to 0 V

which can be observed by D11 illuminating.

8. Once again, place the short between VPWR and VMID at J2. Pull RSTb to 0 V by pushing S1. This clears the fault and D11 will

turn off.

1.4 Quick Reference Tables

Table 1.2. Test Point Descriptions

Test Point Description Referenced to:

TP1 VIN GNDA

TP2 GNDA N/A

TP3 VPWR VMID

TP4 VDDB VMID

TP5 VMID N/A

TP6 VSSB VMID

TP7 GNDA N/A

TP8 VSW GNDA

TP9 T1_SEC8 VMID

TP10 T1_SEC5 VMID

TP11 VMID/GNDB N/A

TP13 VSNS VSSB

TP14 VMID N/A

TPV12 CLMP VSSB

TPV13 GATE VMID

UG167: Si8281-EVB User's Guide

Overview and Setup

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2. Schematics

TP7

GNDA

VIN

GNDA

VMID

VDDB

VPWR

VMID

VSSB

VIN

SF1

BUMPER

SF2

BUMPER

SF3

BUMPER

SF4

BUMPER

Si8281

VIN

GNDA

VDDB

VMID

VSSB

VPWR

OUTPUT

INPUT

TP1

VIN

TP2

GNDA

TP3

VPWR

TP4

VDDB

TP5

VMID

TP6

VSSB

VDDB

VSSB

VPWR

VMID

TP14

VMID

Figure 2.1. Si8281-EVB Top Level Schematic

UG167: Si8281-EVB User's Guide

Schematics

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TPV12

CLMP

R27 NI

D9 NI

GATE

VDDB

10K

VDDB

10K

CLMP

VSSB

CLMP

VDDA

D11

FLT

VDDA

10K

RST

J11

VDDA

10K

RST 1

FLT 1

IN+ 1

J10

IN- 1

VIN

TP13

VSNS

2.5uH

R10 25

VMID

JP2 JS2

R3 200K C10 1.5nF

7.87K

182K

RDY 1

10uF

C1 10uF

10uF

0.1uF

D10 ES1F

0.1uF

R4 100

C18

10uF

C16

390pF

DSAT

D1 B160

B160

R12 1.0

100

100pF

GNDA

VIN

VDDB

VMID

VSSB

VPWR

TP8

VSW

TP9

T1_SEC8

TP10

T1_SEC5

R28

10K

R29

10K

ISOLATION

Si8281CD-IS

VDDA

VH 15

CLMP 13

VSW

GNDP

NC 18

VDDP

DSAT 17

VSNS 20

RST

FLT

VDDB 16

GNDA

RDY

COMP 19

VL 14

IN+

IN-

VMID 12

VSSB 11

VMID

VSSB

JP1 JS1

TPV13

GATE

Prototyping area

Discrete Capacitor Load

Resistor value and power rating for R10, R11,

R12 are dependent on switching frequency and

gate loading of the IGBT/MOSFET device.

1. DC/DC is built to drive to create +15/-11V.

2. To operate with positive voltage gate drive only:

a. Remove R13

b. Install R14 = 0 Ohm

c. Change divider VDDB-VSSB = (R1/R2 +1) x 1.05V

+IN/-IN have weak internal pull down

(4uA).

Signal sources should be placed as close

as possilbe to +IN/-IN inputs to minimize

noise coupling.

+IN and -IN should be terminated directly

to VDDA/GNDA accordingly if not used.

VDDB

C12

10uF

C13

0.1uF

R11 10

R13 0

R14

C15

0.1uF

C14

10uF

J4 1

111315

121416

J5 1

111315

121416

TO-247 pinout place holder

GATE

DSAT

VMID

TO-220 pinout place holder

DSAT

C17

C11

GATE

VMID

VPWR

VDDB

TP11

VMID/GNDB

VSSB

Figure 2.2. Si8281 Circuit Schematic

UG167: Si8281-EVB User's Guide

Schematics

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3. Layout

Figure 3.1. Si8281-EVB Top Silkscreen

Figure 3.2. Si8281-EVB Top Copper

UG167: Si8281-EVB User's Guide

Layout

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Figure 3.3. Si8281-EVB Bottom Silkscreen

Figure 3.4. Si8281-EVB Bottom Copper

UG167: Si8281-EVB User's Guide

Layout

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4. Bill of Materials

Table 4.1. Si8281-EVB Bill of Materials

Part Reference Description Manufacturer Manufacturer Part

Number

C1, C3, C5, C7, C12,

C14, C18

CAP, 10 μF, 50 V, ±20%, X7R, 1210 Venkel C1210X7R500-106M

C2 CAP, 100 pF, 50 V, ±20%, C0G, 0603 Venkel C0603C0G500-101M

C3 CAP, 390 pF, 100 V, ±20%, X7R, 0805 Venkel C0805X7R101-391M

C4, C6, C8, C9, C13,

C15

CAP, 0.1 μF, 50 V, ±10%, X7R, 0805 Venkel C0805X7R500-104K

C10 CAP, 1.5 nF, 250 V, ±10%, X7R, 0805 Venkel C0805X7R251-152K

C16 CAP, 390 pF, 50 V, ±10%, C0G, 0603 Venkel C0603C0G500-391K

D1, D2 DIO, SCHOTTKY, 60 V, 1 A, SMB Diodes Inc. B160-13-F

D4, D5, D11 LED, RED, 631 nM, 20 mA, 2 V, 54mcd, 0603 Lite-On Tech. LTST-C190KRKT

D10 DIO, FAST, 300 V, 1.0 A, SMA Fairchild ES1F

J1, J2 CONN, TERM BLOCK 2POS, 2.54 MM, RT PCB PHOENIX CONTACT 1725656

J3 CONN, TERM BLOCK 3POS, 2.54 MM, RT PCB PHOENIX CONTACT 1725669

J6, J7, J8, J9, J10 Header, Single Pin, Tin Plated Samtec TSW-101-07-T-S

J11, TP7, TP11 SOLDER TURRET, 0.064 inD, 0.105 inL Mill-Max 2551-2-00-44-00-00-0

7-0

JP1, JP2 Header, 2x1, 0.1 in pitch, Tin Plated Samtec TSW-102-07-T-S

JS1 JS2 Shunt, 1x2, 0.1 in pitch, Tin plating Samtec SNT-100-BK-T

R1 RES, 182 K, 1/10 W, ±1%, ThickFilm, 0603 Venkel CR0603-10W-1823F

R2 RES, 7.87 K, 1/16 W, ±1%, ThickFilm, 0603 Venkel CR0603-16W-7871F

R3 RES, 200 K, 1/10 W, ±1%, ThickFilm, 0603 Venkel CR0603-10W-2003F

R4 RES, 100 Ω, 1/16 W, ±1%, ThickFilm, 0603 Venkel CR0603-16W-1000F

R5 RES, 100 Ω, 1/10 W, ±1%, ThickFilm, 0603 Venkel CR0603-10W-1000F

R6, R7, R8, R9, R28,

R29

RES, 10 K, 1/16 W, ±1%, ThickFilm, 0603 Venkel CR0603-16W-1002F

R10 RES, 25 Ω, 1/4 W, ±5%, ThickFilm, 1206 Venkel CR1206-4W-250J

R11 RES, 10 Ω, 1/4 W, ±1%, ThickFilm, 1206 Venkel CR1206-4W-10R0F

R12 RES, 1.0 Ω, 1/4 W, ±5%, ThickFilm, 1206 Venkel CR1206-4W-1R0J

R13, R14 RES, 0 Ω, 2 A, ThickFilm, 0805 Venkel CR0805-10W-000

S1 SWITCH, PB, NO, MOMENTARY, TACTILE, LIGHT

TOUCH 130GF, 6MM, PTH

Panasonic EVQ-PAD04M

SF1, SF2, SF3, SF4 HDW, BUMPON CYLINDRICAL, 0.312 x 0.215, BLK 3M SJ61A6

T1 TRANSFORMER, POWER, FLYBACK, 5kV ISOLATED,

2.5uH, 100nH LEAKAGE, 7:1, 5:1, SMT

UMEC UTB02241s

TP1, TP2, TP3, TP4,

TP5, TP6, TP14

TESTPOINT, BLACK, PTH Kobiconn 151-203-RC

UG167: Si8281-EVB User's Guide

Bill of Materials

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Part Reference Description Manufacturer Manufacturer Part

Number

TP8, TP9, TP10,

TP13

TESTPOINT, WHITE, PTH Kobiconn 151-201-RC

U1 IC, 4 AMP ISODRIVER WITH DC-DC, SO20 WB Silicon Labs Si8281CD-IS

UG167: Si8281-EVB User's Guide

Bill of Materials

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5. Ordering Guide

Table 5.1. Si8281-EVB Ordering Guide

Ordering Part Number (OPN) Description

Si8281-KIT Si8281 Isolated gate driver evaluation board kit.

UG167: Si8281-EVB User's Guide

Ordering Guide

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