Silicon Laboratories Si8751 Manual de usuario
UG246: Si875x User's Guide
The Si875x isolated MOSFET driver is ideal for driving power switches used in a wide
variety of applications, offering longer service life and dramatically higher reliability com-
pared to common SSRs. The Si875x isolated MOSFET driver utilizes Silicon Laborato-
ries' proprietary silicon isolation technology supporting up to 2.5 kVRMS withstand volt-
age per UL1577 and VDE0884. This technology enables reduced variation with temper-
ature and age, better part-to-part matching, and extremely high reliability. High integra-
tion, low propagation delay, small installed size, flexibility, and cost-effectiveness make
the Si875x ideal for a wide range of isolated MOSFET gate drive applications. The
Si875x evaluation board allows designers to evaluate Silicon Labs' Si875x family of
MOSFET drivers. The boards come populated with either the Si8751 (digital input) or
Si8752 (LED emulator input) version of the family. The board includes screw terminals
for quick evaluation of the device's key parameters and also includes test points on each
of the device’s pins to accommodate direct connection to the designer’s end system. For
more ISOdriver information, visit the Silicon Labs website at www.silabs.com/isolation.
KEY FEATURES OR KEY POINTS
• Easy to use
• Supports both dc or ac switching
• Jumper selectable power reduction options
• Jumper to evaluate Miller Clamp function
• Digital input or diode emulation options
• Si8751-KIT (digital input)
• Si8752-KIT (diode emulation)
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1. Kit Contents
The Si875x Evaluation Kit contains the following items:
• Si875x-based evaluation board shown in the figure below:
Figure 1.1. Si8751 Evaluation Board
Figure 1.2. Si8752 Evaluation Board
UG246: Si875x User's Guide
Kit Contents
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2. EVB Test
To run the test, follow the instructions in the following sections.
2.1 Required Equipment
The following equipment is required to demonstrate the evaluation board:
• 1 digital multimeter
• 1 dc power supply: 0 – 5 V
• 1 dc power supply: 0 – 15 V
• 1 1k – 2k 0.25 W resistor
• Assorted cables and leads as necessary to connect equipment to EVB
• Si875x Evaluation Board (board under test)
• Si827x Evaluation Board User's Guide (this document)
2.2 EVB Test
To run the test, follow the instructions in the following sections.
2.2.1 DC Supply Configuration
1. Set the 5 V supply to output 5 VDC.
2. Turn OFF the supply and connect the positive lead to J1 pin1.
3. Connect the negative lead to J1 pin 2.
4. Set the 15 V supply to output 15 VDC.
5. Turn OFF the supply and connect the positive lead to J3 pin 1.
6. Connect the negative lead to J3 pin 2.
7. Connect the positive lead of the multimeter, and one end of the resistor, to J4 pin 1.
8. Connect the negative lead of the multimeter, and the other end of the resistor, to J4 pin 2.
9. Turn ON the dc power supplies.
10. Ensure that the current draw is less than 25 mA in any of the supplies. If it is larger, this indicates that either the board or Si875x
has been damaged or the supply is connected backwards.
2.2.2 Test the Si875x DC Switch
1. Place a shunt between pins 2 and 3 of J2 (Si8751) or J5 (Si8752) and JP6.
2. The multimeter should measure 0 V.
3. Move the shunt from pins 2 and 3 to pins 1 and 2 on J2 (Si8751) or J5 (Si8752).
4. The multimeter should now measure 15 V.
5. Move the shunt back to pins 2 and 3.
6. Turn off the dc supplies.
2.2.3 Test the Si875x AC Switch
1. Move the 15 V supply positive lead to J6 pin1 and the negative lead to J6 pin 2.
2. Move the multimeter positive lead, and the resistor lead, to J7 pin 1 and the negative lead, and the resistor lead, to J7 pin 2.
3. Move the shunt from JP6 to JP8.
4. Turn on the dc supplies. Again, there should be no current draw greater than 25 mA.
5. The multimeter should measure 0 V.
6. Move the shunt on J2 (Si8751) or J5 (Si8752) from pins 2 and 3 to pins 1 and 2.
7. The multimeter should now measure 15 V.
UG246: Si875x User's Guide
EVB Test
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3. Schematics
Figure 3.1. Si8751-EVB Schematic
Figure 3.2. Si8752-EVB Schematic
UG246: Si875x User's Guide
Schematics
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4. Layout
Figure 4.1. Primary Silkscreen
UG246: Si875x User's Guide
Layout
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Figure 4.2. Primary Side
UG246: Si875x User's Guide
Layout
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Figure 4.3. Secondary Side
Figure 4.4. Secondary Silkscreen
UG246: Si875x User's Guide
Layout
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5. Bill of Materials
Si8751-EVB Bill of Materials
Table 5.1. Si8751-EVB Bill of Materials
Qty Ref Value Type PCB_Footprint Manufacturer PN Manufacturer
1 C1 10uF X7R C1210 C1210X7R500-106M Venkel
2 C2 C3 0.1uF X7R C0805 C0805X7R101-104K Venkel
3 C4 C5 C6 200pF C0G C0805 C0805C0G500-201K Venkel
1 D1 5.6V Zener DO-214AA 1SMB5919BT3 On Semi
1 D2 RED SMT, Chi-
pLED
LED-HSMX-C170 HSMZ-C170 Avago Technologies
1 D3 ES1D Fast DO-214AC ES1D Diodes Inc.
5 J1 J3 J4 J6
J7
CONN
TRBLK 2
TERM BLK
MALE
CONN-TB-1757242 1757242 PHOENIX CONTACT
1 J2 Header
1x3
Header CONN-1X3 TSW-103-07-G-S Samtec
9 JP1 JP2
JP3 JP4
JP5 JP6
JP7 JP8
JP9
JUMPER Header CONN1X2 TSW-102-07-T-S Samtec
5 JP10 JP11
JP12 JP13
JP14
PLUG TERM BLK 1757019 Phoenix Contact
5 JS1 JS2
JS3 JS4
JS5
Jumper
Shunt
Shunt SHUNT SNT-100-BK-T Samtec
1 LB1 OPN:
Si8751_EV
B
POLYI-
MIDE,
WHITE
PTL-14-477 LABEL-Si8751_EVB Silabs
4 MH1 MH2
MH3 MH4
4-40 HDW MH-125NP|MH-125 NSS-4-4-01 Richco Plastic Co
1 PCB1 Si875x_EV
B REV 1.0
BARE PCB N/A Si875x_EVB REV 1.0 SiLabs
3 Q2 Q4 Q5 FDD6N25 N-CHNL DPAK-G2SD FDD6N25 Fairchild
2 R1 R9 0 ThickFilm R0402|R0402L CR0402-16W-000 Venkel
1 R2 100 ThickFilm R0603|R0603L CR0603-10W-1000F Venkel
1 R4 49.9 ThickFilm R0805 CR0805-10W-49R9F Venkel
1 R5 10K ThickFilm R0805 CR0805-10W-1002F Venkel
1 R6 49.9K ThickFilm R0805 CR0805-10W-4992F Venkel
4 SO1 SO2
SO3 SO4
STAND-
OFF
HDW 1902D Keystone Electronics
UG246: Si875x User's Guide
Bill of Materials
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Qty Ref Value Type PCB_Footprint Manufacturer PN Manufacturer
17 TP1 TP2
TP3 TP4
TP5 TP6
TP7 TP8
TP9 TP10
TP11 TP13
TP14 TP15
TP16 TP17
TP18
WHITE Loop TESTPOINT 151-201-RC Kobiconn
1 U1 Si8751 Isolator SO8N6.0P1.27 Si8751 SiLabs
Table 5.2. Si8751-EVB Not Installed Components
Qty Reference Value Type PCB_Footprint ManufacturerPN Manufacturer
1 J5 Header
1x3
Header CONN-1X3 TSW-103-07-G-S Samtec
1 JS6 Jumper
Shunt
Shunt SHUNT SNT-100-BK-T Samtec
1 Q3 MMBT222
2LT1
NPN SOT23-BEC MMBT2222LT1 On Semi
3 Q6 Q7 Q8 IRG4BC10
UDPBF
IGBT TO-220|TO220-UP IRG4BC10UDPBF IR
1 R3 330 ThickFilm R0805 CR0805-10W-3300F Venkel
1 R7 0 ThickFilm R0402|R0402L CR0402-16W-000 Venkel
1 R8 25.5K ThickFilm R0805 CR0805-10W-2552F Venkel
1 TP12 WHITE Loop TESTPOINT 151-201-RC Kobiconn
UG246: Si875x User's Guide
Bill of Materials
silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 8
Si8752-EVB Bill of Materials
Table 5.3. Si8752-EVB Bill of Materials
Qty Reference Value Type PCB_Footprint ManufacturerPN Manufacturer
1 C1 10uF X7R C1210 C1210X7R500-106M Venkel
3 C4 C5 C6 200pF C0G C0805 C0805C0G500-201K Venkel
1 D1 5.6V Zener DO-214AA 1SMB5919BT3 On Semi
1 D2 RED SMT, Chi-
pLED
LED-HSMX-C170 HSMZ-C170 Avago Technologies
1 D3 ES1D Fast DO-214AC ES1D Diodes Inc.
5 J1 J3 J4 J6
J7
CONN
TRBLK 2
TERM BLK
MALE
CONN-TB-1757242 1757242 PHOENIX CONTACT
1 J5 Header
1x3
Header CONN-1X3 TSW-103-07-G-S Samtec
5 JP10 JP11
JP12 JP13
JP14
PLUG TERM BLK 1757019 Phoenix Contact
5 JP5 JP6
JP7 JP8
JP9
JUMPER Header CONN1X2 TSW-102-07-T-S Samtec
3 JS4 JS5
JS6
Jumper
Shunt
Shunt SHUNT SNT-100-BK-T Samtec
1 LB1 OPN:
Si8752_EV
B
POLYI-
MIDE,
WHITE
PTL-14-477 LABEL-Si8752_EVB Silabs
4 MH1 MH2
MH3 MH4
4-40 HDW MH-125NP|MH-125 NSS-4-4-01 Richco Plastic Co
1 PCB1 Si875x_EV
B REV 1.0
BARE PCB N/A Si875x_EVB REV 1.0 SiLabs
3 Q2 Q4 Q5 FDD6N25 N-CHNL DPAK-G2SD FDD6N25 Fairchild
1 Q3 MMBT222
2LT1
NPN SOT23-BEC MMBT2222LT1 On Semi
1 R2 100 ThickFilm R0603|R0603L CR0603-10W-1000F Venkel
1 R3 330 ThickFilm R0805 CR0805-10W-3300F Venkel
1 R7 0 ThickFilm R0402|R0402L CR0402-16W-000 Venkel
1 R8 25.5K ThickFilm R0805 CR0805-10W-2552F Venkel
4 SO1 SO2
SO3 SO4
STAND-
OFF
HDW 1902D Keystone Electronics
17 TP1 TP2
TP3 TP4
TP5 TP7
TP8 TP9
TP10 TP11
TP12 TP13
TP14 TP15
TP16 TP17
TP18
WHITE Loop TESTPOINT 151-201-RC Kobiconn
1 U1 Si8752 Isolator SO8N6.0P1.27 Si8752 SiLabs
UG246: Si875x User's Guide
Bill of Materials
silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 9
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