SI8241BB-B-IS1 - 2.5 kV Class D Audio Driver | Silicon Labs
MPN： SI8241BB-B-IS1 ✓ 啟用中SI8241BB-B-IS1 概覽
An isolated gate driver sits between a controller and the high-voltage, high-current MOSFETs in a power-conversion stage. The SI824x family combines input-to-output isolation with high-side and low-side drive functions, allowing a Class D audio amplifier to use a low-voltage control domain while switching a separate, potentially high-voltage output domain. The SI8241 is specifically oriented toward high-fidelity audio rather than general-purpose isolated communication.
Key verified characteristics include two isolated driver channels, PWM input, 2.5 kV isolation capability, 0.5 A output drive current, 8 V UVLO, precision linear programmable dead time, high latchup immunity greater than 100 V/ns, output-to-output isolation rated at 1500 Vrms, and supply voltage values of ±750 V as described in the retrieved manufacturer-family datasheet information. The 16-SOIC package matches the verified distributor listing.
The device combines separate high-side and low-side gate-drive outputs with dead-time control, which is important because MOSFET conduction overlap can increase loss and distortion. Independent isolation between control and power domains can simplify safety-oriented partitioning, although the complete amplifier still requires correctly rated DC buses, insulation, surge protection, and layout isolation. The isolation barrier should not be treated as a substitute for system-level safety validation.
Typical applications are stereo and multichannel Class D audio amplifiers, powered speakers, soundbars, home-theater receivers, professional audio equipment, and other systems using external MOSFET output stages. It is most appropriate where PWM modulation and a high-power MOSFET bridge are already part of the signal chain, not as a replacement for a finished audio power amplifier.
When laying out this device, keep primary-side and secondary-side copper and input paths separated, use the manufacturer-recommended isolation and bypass layout, and place gate-driver outputs close to the corresponding MOSFET gates. Confirm dead time, UVLO behavior, bus transients, and thermal conditions against the final power stage. This page combines verified distributor and manufacturer-family information with engineering selection guidance rather than inventing unspecified electrical details.
直接替換替代品，適用於 SI8241BB-B-IS1 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SI8241BB-B-IS1 （相同外形與佔位） — 差異在於 Channel Count, Dead-Time Control, Latchup Immunity, Package, Product Type.
SI8241BB-D-IS1
✅ 直接替換聯絡詢價
查看資料表 →SI8241BB-B-IS1 最大額定值與電氣特性
| Product Type | Two-channel isolated Class D audio gate driver |
| Output Drive Current | 0.5 A |
| Isolation Rating | 2.5 kV |
| Input Type | PWM input |
| Dead-Time Control | Precision linear programmable dead-time generator |
| UVLO | 8 V |
| Latchup Immunity | Greater than 100 V/ns |
| Output-to-Output Isolation | 1500 Vrms |
| 供應電壓 | ±750 V |
| Channel Count | 2 |
| Target Power | Greater than 30 W |
| 封裝 | 16-SOIC, 0.154 inch / 3.90 mm width |
| 安裝類型 | Surface mount |
| Manufacturer Description | Class D audio driver with precision dead-time generator |
| Audio Use Case | High-fidelity Class D power amplifiers |
SI8241BB-B-IS1 high-fidelity class d power amplifiers 腳位配置指南
SI8241BB-B-IS1（high-fidelity class d power amplifiers 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： SI8241BB-B-IS1.
請參閱 資料表 以查看完整腳位配置。
典型應用
SI8241BB-B-IS1 適用於 6 應用s: Stereo Class D Speaker Amplifier, Powered Bookshelf Speaker, Home-Theater Multi-Channel Amplifier, Soundbar Audio Power Stage, Professional Audio Power Amplifier, USB or Portable Audio Power Module.
Stereo Class D Speaker Amplifier
The SI8241BB-B-IS1 fits a stereo Class D speaker amplifier because its two isolated driver channels can control complementary high-side and low-side MOSFETs in separate audio power stages. The verified 0.5 A output current is intended for gate-drive use, while the programmable dead-time generator helps prevent MOSFET overlap during switching transitions. A typical design uses PWM audio signals from a controller, the SI824x isolation barrier between control and power domains, and external MOSFET bridges connected to speaker loads. The amplifier’s actual output power still depends on bus voltage, speaker impedance, PWM strategy, MOSFET selection, and thermal design.
推薦
Powered Bookshelf Speaker
For a powered bookshelf speaker, the SI8241BB-B-IS1 can provide isolated gate drive for a compact external-MOSFET output bridge. Its two-channel architecture is appropriate when left and right audio channels require synchronized high-side and low-side drive, while the precision programmable dead time supports controlled switching between devices. The 16-SOIC format helps keep the control and power functions in a defined package, but the PCB still needs adequate copper for switching current and adequate spacing around the isolation barrier. Verify speaker impedance, supply rails, amplifier modulation, and MOSFET thermal limits before using the part in a consumer enclosure.
推薦
Home-Theater Multi-Channel Amplifier
The SI8241BB-B-IS1 is suited to multi-channel home-theater amplifier boards that distribute isolated PWM drive to several external MOSFET output stages. Its two-channel structure can serve as the building block for multiple amplifier channels, while the isolated control side helps the system maintain a functional separation between low-voltage signaling and high-voltage switching. The verified 2.5 kV isolation capability and 1500 Vrms output-to-output isolation information support isolation-aware design, but they do not determine the complete product safety rating. Channel-to-channel symmetry, dead-time consistency, bus transients, and amplifier protection must be verified at system level.
推薦
Soundbar Audio Power Stage
In a soundbar, space and EMI constraints make isolated external-MOSFET drive attractive, and the SI8241BB-B-IS1 provides a defined two-channel driver solution for Class D power stages above 30 W. PWM input allows the audio controller to determine the switching waveform, and the precision dead-time generator helps reduce unwanted simultaneous conduction between complementary devices. The package must be placed so that gate-drive traces remain short and that high-dV/dt switching energy is kept away from audio input and control traces. Because the retrieved data does not include a complete reference design, follow the official family datasheet for bypass and isolation layout.
推薦
Professional Audio Power Amplifier
The SI8241BB-B-IS1 can support professional audio amplifier modules where isolated control, adjustable dead time, and a two-channel driver arrangement are useful for high-power Class D output. The verified 0.5 A drive current should be matched to the external MOSFET gate charge and switching frequency; it is not an amplifier-current rating. In a professional product, engineers must also evaluate thermal cycling, transient protection, output impedance, speaker or line-load behavior, and the separation between primary and secondary domains. The isolation rating is useful for architecture planning but does not replace an application-specific safety assessment.
推薦
USB or Portable Audio Power Module
The SI8241BB-B-IS1 is appropriate when a portable or USB-connected audio system needs a low-voltage control domain to drive a separated Class D MOSFET output. Its isolated-driver architecture can help organize the boundary between the audio controller and switching power stage, while PWM input and programmable dead time support controlled bridge operation. The design must still address supply startup, undervoltage behavior at the verified 8 V UVLO point, inrush current, ground strategy, and enclosure creepage. A compact package does not remove the need for adequate copper, thermal paths, and high-voltage safety engineering.
推薦
推薦產品摘要
工程參考資料，適用於 SI8241BB-B-IS1 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SI8241BB-D-IS1 |
|---|---|---|
| Package | 16-SOIC | 16-SOIC |
| Brand | Silicon Labs | Silicon Labs |
主要差異化特點
- Audio-specific isolated driver architecture (對比SI8241BB-D-IS1)
- Verified high-side and low-side use case (對比SI8241BB-D-IS1)
- Programmable switching control (對比SI8241BB-D-IS1)
設計說明
Keep the high-side and low-side gate-drive traces short and connect each output directly to the intended MOSFET gate with minimal loop area. Place the SI8241BB-B-IS1 bypass capacitors according to the official Si824x datasheet and keep the PWM input and feedback traces away from the switching node. Because high dV/dt can couple into the control domain, route the isolation barrier and power-side return current using the manufacturer’s recommended topology.
Verify that 0.5 A output drive is appropriate for the external MOSFET gate charge, switching frequency, and driver supply. The drive current is a gate-drive parameter, not the Class D speaker output current. Confirm UVLO behavior against the 8 V value, check startup and shutdown sequencing, and ensure the MOSFETs, bus protection, and supply rails remain within their ratings under worst-case audio transients.
Do not treat the 2.5 kV isolation capability or 1500 Vrms output-to-output isolation as automatic system compliance. Validate creepage, clearance, insulation, surge immunity, and test requirements for the finished product. Also do not substitute a same-package part solely from its physical outline; compare pin names, dead-time behavior, UVLO, drive current, isolation ratings, and voltage limits before treating it as a drop-in replacement.
合規資訊
The supplied verified data does not state product-specific RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification information. The isolated Class D audio-driver function is not by itself an automotive qualification claim.
