IRS2181STRPBF - 600V Half-Bridge Gate Driver IC | Infineon
MPN: IRS2181STRPBF ✓ Hoạt độngIRS2181STRPBF Tóm tắt
A gate driver IC such as the IRS2181STRPBF belongs to the power-management semiconductor family, specifically the high-side/low-side (HS/LS) driver subcategory. In a switched-mode power architecture, the gate driver sits between a low-power control IC (microcontroller, DSP, or analog controller) and the high-power switching devices (MOSFETs or IGBTs). Its function is to translate low-current logic-level PWM signals into high-current drive signals capable of rapidly charging and discharging the gate capacitance of power transistors, which keeps switching losses low and prevents shoot-through. The IRS2181 family uses a bootstrap capacitor on the VB pin to derive the floating supply for the high-side channel, eliminating the need for an isolated DC/DC converter in many motor-drive and inverter applications.
Key features of the IRS2181STRPBF include a wide VCC range of 10 V to 20 V, 600 V absolute maximum offset voltage, 1.9 A typical source / 2.3 A typical sink output drive current, under-voltage lockout (UVLO) for both VCC and VBS rails, matched propagation delay between channels, and logic inputs that are 3.3 V compatible. A shutdown pin (SD) is provided, and the logic polarity is non-inverting on both high-side and low-side outputs, which simplifies firmware and timing design. The 8-pin SOIC package offers a small footprint that is compatible with standard reflow profiles and is suitable for high-density PCB layouts.
Architecturally, the IRS2181 combines a floating high-side well capable of withstanding 600 V transient swings, a low-side driver referenced to VCC/GND, and a CMOS input stage with internal pull-downs. The high-side channel includes its own level shifter that translates the low-side HIN PWM signal up to the floating VB supply. A built-in dead-time control is not present; the IRS2181 relies on the controller to insert dead time externally, which gives designers flexibility in tuning switching behavior. The latch-immune CMOS process minimizes dv/dt-induced false triggering that historically plagued discrete bootstrap driver designs.
Typical applications include variable-frequency motor drives for HVAC and small appliances, low-power DC/AC solar micro-inverters, switch-mode power supplies (SMPS) with synchronous rectification, electronic ballasts for HID and fluorescent lighting, induction-heating cooktops, and class-D audio amplifiers. The device is also widely used in three-phase inverter modules for BLDC and PMSM motors when paired with three IRS2181 devices (one per phase) plus a controller such as the IRMCF143 or a TI C2000 MCU. In each case, the IRS2181STRPBF's 600 V rating comfortably covers 230 VAC rectified (≈325 V) and 120 VAC rectified (≈170 V) bus rails with substantial safety margin.
A primary design consideration is the bootstrap capacitor sizing: CB must hold VBS above the UVLO threshold for the longest high-side on-time. A conservative formula uses CB ≥ QG(MAX)/ΔVBS, with a safety factor of 2x to 5x. For a 100 nC gate charge and 200 mV allowable droop, CB ≥ 0.5 µF; designers often select 1 µF to 4.7 µF X7R ceramics. The bootstrap diode must be a fast-recovery type (≤100 ns trr) rated for the full DC bus voltage.
This page synthesizes distributor pricing, drop-in SOIC-8 alternatives from the same IRS2181/IRS2184 family and competing half-bridge drivers, and practical bootstrap design guidance not collected in any single manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho IRS2181STRPBF — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với IRS2181STRPBF (cùng hình factor và footprint) — khác nhau ở Configuration, Package, Number of Outputs, Input Logic Compatibility, Operating Temperature Range.
IRS2181SPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
IR2104STRPBF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →IRS21171STRPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
IRS2011STRPBF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →IRS4427STRPBF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →NCP5106BDR2G
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
L6384ED013TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
IRS2181STRPBF Tỷ lệ tối đa & tính chất điện
| Chức năng | Half-Bridge Gate Driver |
| Configuration | High-side and low-side referenced, non-inverting |
| Số lượng đầu ra | 2 (HO, LO) |
| Offset Voltage (max) | 600 V |
| VCC Supply Voltage | 10 V to 20 V |
| VBS Bootstrap Supply Voltage | 10 V to 20 V (referenced to VS) |
| Output Source Current (typ) | 1.9 A |
| Output Sink Current (typ) | 2.3 A |
| Logic Input Compatibility | 3.3 V and 5 V logic |
| Under-Voltage Lockout (UVLO) | Present on VCC and VBS |
| Shutdown Pin (SD) | Yes, active-low compatible input stage |
| Khoảng nhiệt độ hoạt động | -40 C to +125 C (junction) |
| Hộp | 8-pin SOIC (SO-8, 0.154" / 3.90 mm body width) |
| Kiểu lắp đặt | Surface Mount |
| Lead Finish | Pb-free (PBF suffix) |
| RoHS Compliance | Compliant (Pb-free) |
Cấu hình chân IRS2181STRPBF
| Chân 1 | VCC — Logic and low-side supply voltage (10 V to 20 V) |
| Chân 2 | HIN — Logic input for high-side gate driver output (HO), non-inverting |
| Chân 3 | LIN — Logic input for low-side gate driver output (LO), non-inverting |
| Chân 4 | SD — Shutdown input - logic low disables both HO and LO outputs |
| Chân 5 | COM — Low-side return / ground reference for VCC and LO |
| Chân 6 | LO — Low-side gate drive output referenced to COM |
| Chân 7 | VS — High-side floating supply return / bootstrap capacitor negative terminal |
| Chân 8 | HO — High-side gate drive output referenced to VS |
Ứng dụng tiêu biểu
IRS2181STRPBF phù hợp cho 6 Áp dụngs: BLDC Motor Drive (24-48 V DC Bus), 230 VAC Solar Micro-Inverter, Electronic Ballast (HID / Fluorescent), Switch-Mode Power Supply with Synchronous Rectification, Induction-Heating Cooktop, Class-D Audio Amplifier Output Stage.
BLDC Motor Drive (24-48 V DC Bus)
The IRS2181STRPBF is a strong fit for 24 V to 48 V brushless DC motor half-bridge stages in SO-8 packages. Its 1.9 A source / 2.3 A sink current drives typical 40 V-100 V MOSFETs with gate charges under 50 nC in tens of nanoseconds, keeping switching losses small at 20-50 kHz PWM. Its 600 V offset rating leaves huge margin over the 48 V bus, improving robustness against inductive transients. The shutdown pin enables fast fault response for overcurrent protection, and the SO-8 footprint fits compact motor-control PCBs.
Được đề xuất
230 VAC Solar Micro-Inverter
In a 230 VAC micro-inverter the rectified DC bus reaches approximately 325 V, well within the IRS2181STRPBF's 600 V offset rating. Its 10-20 V VCC range is compatible with standard auxiliary supplies derived from the bus, and its bootstrap driver eliminates the need for an isolated DC/DC converter to drive the upper MOSFET. With 1.9 A / 2.3 A drive current it switches IGBTs and high-voltage MOSFETs at 16-50 kHz with low loss. The 8-pin SOIC keeps the inverter PCB small and low-cost.
Được đề xuất
Electronic Ballast (HID / Fluorescent)
For HID and fluorescent electronic ballasts the IRS2181STRPBF drives the resonant half-bridge at 30-100 kHz from a rectified 230 VAC bus (about 325 V DC). Its 600 V rating handles the bus with margin, and its matched high-side / low-side propagation delay keeps the resonant tank balanced, reducing acoustic noise and improving lamp life. The 8-pin SOIC and small footprint enable ultra-compact ballast designs where PCB area is at a premium. UVLO on VCC prevents lamp flicker at low-line brownout conditions.
Được đề xuất
Switch-Mode Power Supply with Synchronous Rectification
In an SMPS with synchronous rectification the IRS2181STRPBF drives the synchronous-rectifier MOSFETs in a half-bridge or push-pull topology from a 12 V or 24 V input. Its 1.9 A / 2.3 A source/sink current keeps the SR MOSFETs switching fast at 100-500 kHz, reducing conduction loss. The 8-pin SOIC footprint simplifies layout on dense primary-side power boards, and the logic-compatible inputs interface directly with most PWM controller ICs. UVLO protects the SR stage during startup transients.
Được đề xuất
Induction-Heating Cooktop
In an induction-heating cooktop the IRS2181STRPBF drives a resonant half-bridge at 20-50 kHz from a rectified 325 V DC bus. Its 600 V offset rating provides substantial margin against resonant tank overshoot and inductive kick. The high peak gate drive current (1.9 A source) enables fast switching of high-current IGBTs, which keeps switching losses low and improves cooking efficiency. The shutdown pin allows rapid disable in response to pan-detection or over-temperature faults for safety compliance.
Được đề xuất
Class-D Audio Amplifier Output Stage
In a class-D audio amplifier the IRS2181STRPBF drives the output half-bridge MOSFETs that deliver the PWM audio signal to the LC low-pass filter and loudspeaker. Its matched channel-to-channel propagation delay preserves audio timing accuracy and reduces distortion, while 1.9 A / 2.3 A source/sink current enables 200-500 kHz switching with reasonable MOSFET sizes. UVLO prevents audible clicks during power-up and power-down sequencing. The 8-pin SOIC keeps amplifier boards compact for slim consumer products.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho IRS2181STRPBF — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | IRS2181SPBF | IR2104STRPBF | IRS21171STRPBF | NCP5106BDR2G | L6384ED013TR |
|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | onsemi | STMicroelectronics |
| Package | SOIC-8 | SOIC-8 (same) | SOIC-8 (same) | SOIC-8 (same) | SOIC-8 (same) | SOIC-8 (same) |
| Offset Voltage (max) | 600 V | 600 V | 600 V | 600 V | 600 V | 600 V |
| Source / Sink Drive Current | 1.9 A / 2.3 A | 1.9 A / 2.3 A | 0.21 A / 0.36 A | 1.0 A / 1.0 A | 1.0 A / 1.0 A | 0.4 A / 0.65 A |
| VCC Supply Range | 10 V to 20 V | 10 V to 20 V | 10 V to 20 V | 10 V to 20 V | 10 V to 20 V | 10 V to 20 V |
| UVLO on VCC and VBS | Yes (both rails) | Yes (both rails) | Yes (VCC only) | Yes (both rails) | Yes (both rails) | Yes (both rails) |
| Shutdown Pin (SD) | Yes | Yes | No | Yes | Yes | Yes |
| Logic Polarity | Non-inverting | Non-inverting | Inverting (HIN/SD logic) | Non-inverting | Non-inverting | Non-inverting |
| Integrated Bootstrap Diode | No | No | No | No | No | Yes |
Bảo phân biệt quan trọng
- Higher peak drive current than the IR2104 family (vsIR2104STRPBF)
- Integrated shutdown pin for fault response (vsIRS21171STRPBF)
- Same SO-8 footprint as ON Semi NCP5106 with higher drive current (vsNCP5106BDR2G)
Ghi chú thiết kế
Bootstrap capacitor sizing is critical for reliable high-side operation. Use CB >= (QG_max * 2) / (VCC - UVLO_threshold - Vf_bootstrap) as a starting point. For a typical 100 nC gate charge and 1 V allowable droop on VBS, a 0.22 uF to 1 uF X7R ceramic at the VB pin is appropriate. The bootstrap diode must be an ultrafast-recovery type (trr <= 100 ns) rated for the full DC bus voltage; UF4007 or ES1J are common low-cost choices. Add a small resistor (3-10 ohm) in series with the bootstrap diode to limit inrush current during VBS recharge.
Keep the high-current gate-drive loop (HO -> gate -> source -> VS -> VB decoupling -> HO) as small as possible to minimize parasitic inductance. Place the VBS decoupling capacitor (0.1 uF to 1 uF) directly between pins 7 (VS) and 8 (HO bypass to VB) with short traces. Use a 4-layer PCB with a continuous ground plane under the driver for best EMI performance. Keep the high-side loop area below approximately 1 square centimeter to avoid ringing above 100 MHz that can radiate EMI.
Do not operate the IRS2181STRPBF above 600 V offset between VB and COM - even brief transients above this rating can permanently damage the high-side level-shifter. Always include a snubber or TVS clamp across the half-bridge to limit dv/dt-induced overshoot. Ensure that VCC does not drop below the UVLO threshold during high-side switching; if it does, the high-side output can latch in an undefined state. Finally, do not leave the SD pin floating - tie it high through a 10 kohm resistor to VCC if unused.
Thông tin tuân thủ
Pb-free (PBF suffix) per Infineon product page; RoHS and REACH compliance stated by the manufacturer. Not AEC-Q100 qualified (industrial/commercial grade). Halogen-free status not explicitly stated in the verified data.
