External transformer type isolated power supply built-in isolator Si88x2x, x4x

Built-in isolated power supply, external transformer type isolated power supply, power capacity, high-efficiency isolated power supply built-in isolator, isolator, gate driver,

Product Summary

The Si88x2x/x4x series is an isolator with a built-in isolated DCDC converter circuit using an external transformer. The Si88x2x has a 2ch isolator, while the Si88x4x has a 4ch isolator. The power supply section has an oscillator, secondary voltage feedback input, and drive FET built in, so power can be supplied with a minimum of external components. By using an external transformer, it is possible to supply power with a high capacity of 2W to 5W to the secondary side. The efficiency is up to about 83%. In addition to the standard type that provides the same range of output for an input of 3 to 5V, there is also a type that can handle high voltages up to 30V input/output by using an external transistor. It can be used in a wide range of applications, such as gate driver power supplies.

Product features

High-speed (100Mbps) isolator with built-in isolated DCDC converter (prop delay 18ns)
Highly efficient 2W~5W isolated power supply with minimum external components. Built-in shutdown, PWM modulator clock variable (200~800KHz), cycle skip, and thermal protection.
DCDC shutdown control (SH, SH_FC terminals are shut down when Hi), inrush current is controlled by soft start control
Internal power supply terminals (VREGA/VREGB) for high voltage control and external FET drive terminal (ESW) allow for minimal external components
WB SOIC-16, WB SOIC-20, WB SOIC24 Package (Creepage 7.6mm)
Wide operating temperature range -40 to 125°C
Various certifications UL 1577:5000Vrms / CSA 62368-1(reinforced insulation) / VDE 62368-1 compliant, (VDE60747-17 basic currently being acquired) AEC-Q100 qualified

Isolated Power Supply

5V input/output FET built-in DCDC converter
It can transmit about 2W of power.

5V input, 24V output isolated DC/DC converter
By adding one external transistor, a high-voltage isolated power supply can be constructed.

24V input 5V output isolated DC/DC converter
High voltage can be input using an external transistor on the input side, and approximately 5W of power can be supplied to the secondary side.

Application example (isolated power supply for gate drivers)

Isolation, gate driver, isolated power supply, ±, plus/minus power supply, half-bridge circuit — UG475 Si823Hx Gate Driver Evaluation Board Example Circuit

Insulated gate driver, isolated power supply IC and transformer. Examples of use in actual equipment with minimum components.

This is an example of an evaluation board that supplies power to the isolated gate driver Si823Hx in a half-bridge circuit. One Si882421BD supplies the secondary power for the upper and lower gate drivers and the 5V power for the primary side.
Each can be driven with positive/negative voltage. In this example, the device temperature is converted to an input frequency signal by the NTC and sent to the primary side.
You can try it out using the circuit that is used as an evaluation board.
Please see UG475 for more details.

Target application

・Industrial automation systems　
-Motor, inverter
-PLC system
-Battery Management
・Automotive applications
-HEV (Hybrid Electric Vehicle) Applications　
-Communication applications such as CAN and their power supplies　
・Signal isolation
-Data Acquisition System

Evaluation Board

Si88xxiso-kit　
This is a standard evaluation board with Si88241ED, 5V input, 5V output type.
　　UG232: Si88xxxISO-EVB User's Guide
This is a board for you to perform basic evaluation by referring to the above user guide.

Si88XXXLOWEMC-KIT
This is a low EMC reference board equipped with Si88241. Please use it as a reference for circuits and layouts.
　　UG470:Si88xxx Low EMC EVB
CISPR-25 conducted and radiated emissions test results are also included.

si886xxiso-kit　
This is a 24V input, 5V output type isolated power supply evaluation board using the Si88621ED-IS.
　　UG524: Si886xx-EVB User Guide　　
　　　　

Si823Hx Gate Driver Board (GDB) 　　　　　　　　　　　　　.

　
　
　
UG475:Si823Hx Gate Driver Board User's Guide
This is the evaluation board for the Si823Hx introduced in the application example above.
It can be evaluated with 12V power input and 5V signal input.

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