AMC0302D - ±50mV Reinforced Isolated Amplifier | Texas Instruments
부품 번호: AMC0302D ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.88 | $28.80 |
| 100 | $2.55 | $255.00 |
| 500 | $2.25 | $1,125.00 |
| 1,000 | $1.98 | $1,980.00 |
AMC0302D 개요
An isolated amplifier is a type of amplifier that provides electrical isolation between its input and output stages, allowing signal measurement across a potential difference while protecting low-voltage control circuitry from high-voltage transients. Isolation amplifiers form a key part of the signal chain in power conversion systems, bridging high-voltage power stages and low-voltage microcontrollers or ADCs. The AMC0302D belongs to the isolation amplifier family used for current sensing, voltage sensing, and isolated data acquisition.
Key features include a linear input voltage range of ±50mV, a fixed gain of 8.2 V/V, and a bandwidth of 250 kHz. DC accuracy is excellent, with maximum offset error of ±0.3mV and gain error of ±0.2%. Low offset drift of ±5 µV/°C keeps performance stable across the full -40°C to +125°C operating range. The differential output is insensitive to ground shifts, enabling reliable signal routing over long distances on crowded PCBs.
The AMC0302D uses a sigma-delta modulation architecture with an internal reference. The isolation barrier is implemented with capacitive coupling, offering high immunity to magnetic interference and supporting reinforced isolation certification of up to 5kVRMS (DWV package) or basic isolation up to 3kVRMS (D package) for 60 seconds, per TI datasheet (SBVS-series, 43 pages).
Typical applications include motor phase current sensing in variable frequency drives, inverter current monitoring in solar and UPS systems, isolated current sensing in industrial automation, and battery management in electric vehicles. High accuracy and reinforced isolation make the AMC0302D suitable for safety-critical designs.
When designing with the AMC0302D, maintain isolation creepage and clearance in the PCB layout, keep high- and low-side grounds separate, and filter the input for low-noise operation.
드롭인 대체품: AMC0302D — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AMC0302DDWVR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AMC1302
⚡ 동일 패키지📋 참조 대체품 (카탈로그에 없음)
AMC1306M25DWVR
⚡ 동일 패키지✓ 재고 있음
$3.53 / 개
데이터시트 보기 →AMC0302D 최대 정격 & 전기적 특성
| Input Voltage Range (Linear) | ±50 mV |
| Gain | 8.2 V/V (fixed) |
| Bandwidth | 250 kHz |
| Offset Error (Max) | ±0.3 mV |
| Gain Error | ±0.2% |
| Offset Drift | ±5 uV/C |
| 출력 유형 | Differential |
| Isolation Rating (DWV package) | 5 kVRMS reinforced (60 s) |
| Isolation Rating (D package) | 3 kVRMS basic (60 s) |
| Isolation Barrier Technology | Capacitive coupling |
| Architecture | Sigma-delta modulator with internal reference |
| 공급 전압 | 3.3 V or 5 V (high-side and low-side) |
| 동작 온도 | -40C to +125C |
| 패키지 | SOIC-8 (D narrow-body / DWV wide-body) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
AMC0302D 핀 구성
| 핀 1 | HGND — High-side ground |
| 핀 2 | HIN — High-side analog input |
| 핀 3 | HGND — High-side ground |
| 핀 4 | HVDD — High-side supply (3.3V/5V) |
| 핀 5 | LVDD — Low-side supply (3.3V/5V) |
| 핀 6 | LGND — Low-side ground |
| 핀 7 | OUTN — Differential output (negative) |
| 핀 8 | OUTP — Differential output (positive) |
일반적인 애플리케이션
AMC0302D 적합 용도: 6 애플리케이션s: Motor Drive Phase Current Sensing, Solar Inverter Current Monitoring, Battery Management Systems (EV), UPS and Industrial Power Supplies, Industrial Automation Current Sensing, Isolated DC Bus Voltage and Current Acquisition.
Motor Drive Phase Current Sensing
The AMC0302D fits motor phase current sensing because its ±50mV input matches low-ohm shunt resistors and its 250 kHz bandwidth captures PWM current ripple in drives switching at 10-20 kHz. The ±0.3mV offset and ±0.2% gain error enable accurate torque control at low currents, while ±5 uV/C drift keeps readings stable across the -40C to +125C automotive and industrial range. Placed in the shunt return path with 5kVRMS (DWV) reinforced isolation, the differential output resists the large ground shifts and dV/dt transients of the inverter power stage, eliminating the ground-loop errors typical of non-isolated amplifiers.
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Solar Inverter Current Monitoring
In solar string and central inverters, the AMC0302D monitors DC and AC-side current across the isolation barrier separating the hazardous PV input from user-accessible low-voltage control. The 5kVRMS reinforced rating (DWV package) supports safety certification requirements for grid-tied equipment, and the ±50mV input allows shunt-based sensing without a power-hungry hall sensor. Its ±0.2% gain error improves MPPT current measurement accuracy and energy harvest reporting, while the differential output routes cleanly across the board, rejecting the switching noise of the DC-DC boost stage that accompanies the isolated amplifier on typical inverter PCBs.
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Battery Management Systems (EV)
The AMC0302D is well suited to EV battery pack current and shunt sensing because reinforced isolation (5kVRMS, DWV) separates the traction high-voltage domain from the low-voltage BMS controller, a requirement for functional safety architectures. The ±0.3mV maximum offset translates to minimal current measurement error with, for example, a 1 mOhm shunt (0.3A equivalent), supporting accurate state-of-charge and precharge-current monitoring. Operation to +125C covers under-hood and pack-adjacent environments, and the differential analog output interfaces directly to isolated or grounded ADCs on the pack controller without additional signal conditioning stages.
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UPS and Industrial Power Supplies
In uninterruptible power supplies and industrial rectifier systems, the AMC0302D provides isolated output-current feedback used for current-mode control and fault protection. Its 250 kHz bandwidth is sufficient for detecting overcurrent events within a switching cycle of 20-50 kHz converters, and the ±5 uV/C drift ensures trip thresholds remain accurate over line and load temperature excursions. The capacitive isolation barrier tolerates the high dV/dt of hard-switched power stages without the magnetic-field sensitivity of transformer-coupled alternatives, and the differential output simplifies routing across the isolation boundary on dense power PCBs with mixed high- and low-voltage domains.
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Industrial Automation Current Sensing
PLC I/O modules, servo drives, and process-control equipment use the AMC0302D for isolated 0-50mV shunt measurements feeding long-distance analog routing, which the differential output handles with strong common-mode rejection. The fixed 8.2 V/V gain removes gain-setting resistor error sources, and the ±0.2% gain error plus ±0.3mV offset meet typical industrial accuracy classes without field calibration. The wide-body DWV package's reinforced 5kVRMS isolation supports IEC safety spacing in modules sharing backplanes with high-voltage drives, while the narrow-body D package suits space-constrained remote I/O tiles running from 3.3V controller supplies.
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Isolated DC Bus Voltage and Current Acquisition
Beyond shunt current sensing, the AMC0302D serves as an isolated front end for divided-down DC bus voltage measurements in traction inverters, chargers, and energy-storage converters. A resistor divider scaled to ±50mV feeds the input; the sigma-delta architecture with internal reference converts it, and the reinforced isolation barrier protects supervisory electronics from the 400-800V bus. Low offset drift (±5 uV/C) preserves accuracy of overvoltage/undervoltage thresholds over temperature, and the differential output can be routed to a grounded ADC many centimeters away, avoiding the single-ended ground-drop errors that plague non-isolated voltage-sense chains.
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추천 제품 요약
엔지니어링 참조 데이터: AMC0302D — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AMC0302DDWVR | AMC1302 | AMC1306M25 |
|---|---|---|---|---|
| Package | SOIC-8 (D/DWV) | SOIC-8 DWV (wide-body) | SOIC-8 | SOIC-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Range | ±50 mV | ±50 mV | ±50 mV | ±250 mV (M25 variant) |
| Gain | 8.2 V/V fixed | 8.2 V/V fixed | 8.2 V/V fixed | N/A (digital modulator output) |
| Output Type | Analog differential | Analog differential | Analog differential | Manchester-coded digital bitstream |
| Isolation Rating (60s) | 5 kVRMS (DWV) / 3 kVRMS (D) | 5 kVRMS reinforced | 5 kVRMS (DWV package) | 5 kVRMS (DW package) |
주요 차별점
- Higher DC precision than AMC1302 family (vs AMC1302)
- Analog differential output simplifies integration (vs AMC1306M25)
- Reinforced 5kVRMS isolation option in same pin package (vs AMC0302DDWVR)
설계 노트
Maintain isolation creepage and clearance per the reinforced rating of the DWV package: keep high-side and low-side ground planes entirely separate and route no low-voltage traces beneath the isolation barrier region of the IC. For the wide-body DWV, use the package slot or keep-out recommendation from TI datasheet to guarantee 5kVRMS reinforced spacing on the PCB, since board layout - not just the package - determines the final isolation performance.
Power the high-side and low-side supplies (3.3V or 5V) with separate, well-decoupled rails. Place a 100nF ceramic capacitor within 2mm of each supply pin plus a 1uF bulk capacitor per side. If the high-side shares its supply with the shunt node potential, consider an isolated bias supply such as the UCC25800-Q1 to avoid transferring switching noise across the barrier via the supply.
Filter the input with a small RC (e.g., 100 ohm / 1nF) close to HIN to suppress shunt parasitic inductance spikes during PWM switching; keep the filter resistor values low so the ±50mV input range is not attenuated or offset. Use a differential RC at OUTP/OUTN before the ADC to reject common-mode noise over long output routes, exploiting the differential output's ground-shift immunity.
Do not exceed the ±50mV linear input range - inputs beyond this range saturate the modulator and distort the output. Also avoid connecting OUTP/OUTN single-ended to ground-referenced ADCs without accounting for the output common-mode voltage; consult the datasheet output common-mode specification for ADC interface headroom.
규정 준수 정보
RoHS compliant per TI product information. Additional REACH/AEC-Q100 status should be confirmed via TI quality pages.
