A4956KLPTR-T - 50V Full-Bridge PWM Gate Driver | Allegro
부품 번호: A4956KLPTR-T ⚠ 최종 구매| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.42 | $34.20 |
| 100 | $2.91 | $291.00 |
| 500 | $2.48 | $1,240.00 |
| 1,000 | $2.15 | $2,150.00 |
A4956KLPTR-T 개요
A brushed DC motor driver in this category is an integrated circuit that combines logic-level input conditioning with high-current gate drive circuitry, allowing low-power microcontrollers to control high-power motor windings through external N-channel MOSFETs. The A4956 specifically targets full-bridge (H-bridge) topologies where four external N-FETs switch bidirectional current through a single motor winding. This architecture (gate driver IC -> brushed DC motor driver -> motor driver IC -> power management IC -> semiconductor) places the A4956 between logic-level control and the high-current power stage.
Key features include adjustable dead time to prevent cross-conduction, integrated charge pump for high-side N-FET drive at 100% duty cycle, comprehensive fault protection (overcurrent, thermal shutdown, undervoltage lockout), and a low-current sleep mode for battery-powered systems. The TSSOP-EP package's exposed thermal pad directly couples driver dissipation into the PCB copper, enabling sustained high-frequency PWM operation without external heatsinking.
The A4956 uses a synchronous bootstrap architecture for high-side drive, with internal charge pump maintaining VGS above VCC for 100% duty cycle operation. Logic inputs accept 3.3 V or 5 V CMOS signals, and the internal current sense comparator enables cycle-by-cycle overcurrent protection with programmable threshold via an external resistor. Synchronous rectification capability reduces body-diode conduction losses in the external MOSFETs.
Typical applications include brushed DC motor control in automotive auxiliary systems, industrial valve and actuator drives, robotics and CNC low-power axes, battery-powered power tools, and HVAC damper actuators. The wide 5.5 V to 50 V supply range accommodates both 12 V automotive and 24 V / 36 V industrial bus rails without intermediate regulation.
When designing with this device, select external N-channel MOSFETs with VDS rating of at least 60 V (for the 50 V supply ceiling) and confirm that the bootstrap capacitor value (typically 100 nF to 1 uF) is sized for the highest PWM frequency and duty cycle in the application. Place the charge-pump and bootstrap capacitors as close as possible to their respective pins to minimize switching transients.
This page synthesizes distributor pricing, drop-in and same-package alternatives, application examples and PCB design notes for the A4956KLPTR-T that are not consolidated in the manufacturer datasheet.
드롭인 대체품: A4956KLPTR-T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
A4956KLPTR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
A4956KLP-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
A4956KLPTR-T 최대 정격 & 전기적 특성
| Motor Type | Brushed DC |
| 토폴로지 | Full-Bridge (H-Bridge), external N-FETs |
| Supply Voltage Range | 5.5 V to 50 V |
| 출력 구성 | NMOS, Parallel interface |
| Maximum Operating Voltage | 50 V |
| 출력 수 | 4 (4 N-channel gate drivers) |
| Logic Input Compatibility | 3.3 V / 5 V TTL |
| Dead-Time Control | Adjustable (external resistor) |
| Charge Pump | Internal, for 100% duty high-side drive |
| Protection Features | Overcurrent, Thermal Shutdown, UVLO |
| 동작 온도 | -40C to +125C |
| 패키지 | 20-TSSOP-EP (exposed pad) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| Automotive Qualification | AEC-Q100 (per Microchip USA listing) |
| Lifecycle Note | NOT FOR NEW DESIGN - restricted to existing customer applications |
A4956KLPTR-T 20-tssop-ep (exposed pad) 핀 구성 가이드
A4956KLPTR-T(20-tssop-ep (exposed pad) 패키지)의 핀 구성입니다. 이 전력 소자는 게이트, 드레인, 소스 단자를 갖추고 있습니다. 비편향 패키지의 경우 정확한 핀 1 방향과 풋프린트 세부 정보는 제조사 데이터시트를 참조하십시오. 일반적인 응용 분야로는 전원 공급 장치 설계, 모터 구동, 부하 스위칭이 있습니다.
다음에 대한 상세 핀아웃 데이터 없음: A4956KLPTR-T.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
A4956KLPTR-T 적합 용도: 7 애플리케이션s: Automotive Brushed DC Auxiliary Motors, Industrial 24V Brushed DC Valve and Actuator Drives, Battery-Powered Power Tools and Corded Drills, Robotics and CNC Low-Power Axes, HVAC Damper and Valve Actuators, Solar Tracking and Small Pump Drives, Educational and Hobby Brushed DC Motor Kits.
Automotive Brushed DC Auxiliary Motors
The A4956KLPTR-T's 5.5 V to 50 V supply range directly supports 12 V automotive body systems (HVAC blowers, seat adjusters, mirror actuators) and 24 V / 48 V mild-hybrid auxiliary rails. Its parallel TTL interface accepts 3.3 V or 5 V PWM directly from a body-domain microcontroller without level shifters, and the integrated charge pump holds high-side gate drive at 100% duty cycle for slow, smooth seat positioning. AEC-Q100 screening (per Microchip USA listing) makes it suitable for underhood and cabin modules. Combined with cycle-by-cycle overcurrent protection that latches on stall, the A4956 protects the FETs during a frozen seat actuator, which is critical for warranty-sensitive automotive designs.
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Industrial 24V Brushed DC Valve and Actuator Drives
The A4956KLPTR-T's 50 V supply ceiling comfortably covers 24 V industrial bus rails with substantial transient headroom, while the TSSOP-EP exposed pad couples switching dissipation directly into PCB copper for continuous-duty valve positioning in process-control panels. Adjustable dead time lets designers trade off switching losses versus cross-conduction risk when switching slow inductive loads such as solenoid valves and damper actuators. The integrated current-sense comparator enables stall detection at the end of valve travel without an external shunt amplifier. Sleep mode preserves battery backup on control panels during outages.
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Battery-Powered Power Tools and Corded Drills
The A4956KLPTR-T's wide 5.5 V to 50 V supply range supports both 18 V / 36 V cordless tool packs and mains-rectified 48 V corded-drill rails from a single driver design, simplifying SKU consolidation for power-tool OEMs. External N-FETs let engineers size RDS(on) for the specific torque and current requirement of each tool (cordless drill vs impact driver), trading off BOM cost against thermal rise. Cycle-by-cycle overcurrent protection handles the high inrush of stalled motor lock, and the TSSOP-EP exposed pad keeps the driver IC cool during the high-duty-cycle bursts of hammer-drill operation. Sleep mode preserves battery charge during idle shelf periods.
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Robotics and CNC Low-Power Axes
The A4956KLPTR-T drives the brushed DC servo axes commonly found in hobby-grade CNC routers, desktop pick-and-place machines, and small robotic arm joints, where the 50 V supply range covers 24 V / 36 V motion-control rails. The parallel logic interface connects directly to FPGA or MCU motion controllers without SPI overhead, allowing sub-microsecond PWM updates for smooth low-speed trajectory following. Adjustable dead time and integrated charge pump maintain clean switching at the high PWM frequencies needed for quiet servo performance. Current-sense feedback enables torque-mode control for compliant grippers and force-feedback haptic devices.
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HVAC Damper and Valve Actuators
The A4956KLPTR-T is well-suited to commercial HVAC damper and zone-valve actuators, where the 50 V supply headroom accepts 24 V AC rectified / 48 V system rails and the TSSOP-EP package fits inside the cramped actuator housing. Low sleep-mode quiescent current preserves backup-battery runtime in wireless damper nodes, and the TTL interface accepts PWM directly from common HVAC microcontrollers without external level shifting. Adjustable dead time prevents cross-conduction during the slow transitions of large damper gear trains, and the integrated current-sense comparator detects mechanical end-stop stall without a separate limit switch. AEC-Q100 screening (per Microchip USA listing) supports rooftop unit designs.
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Solar Tracking and Small Pump Drives
The A4956KLPTR-T powers solar-tracker drive gears and small DC water-pump motors in off-grid installations, where the 5.5 V to 50 V supply range accommodates battery voltages from 12 V to 48 V without intermediate conversion. The exposed-pad TSSOP-EP package dissipates driver heat efficiently into the metal tracker housing, and the internal charge pump keeps high-side FETs fully enhanced even at the slow PWM rates used for sun-tracking slew. Integrated overcurrent protection guards against stall when a tracker encounters debris, and sleep mode cuts quiescent draw during nighttime standby. Parallel logic input accepts PWM directly from the tracker controller's GPIO pins.
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Educational and Hobby Brushed DC Motor Kits
The A4956KLPTR-T's straightforward parallel TTL interface and exposed-pad 20-TSSOP-EP package make it a practical driver for university motor-control labs, hobby robotics kits, and STEM education platforms where students wire PWM signals directly from an Arduino or microcontroller dev kit. The wide 5.5 V to 50 V supply range lets a single board drive motors from small 6 V gear-motors up to 24 V / 36 V industrial motors used in classroom projects. Integrated overcurrent and thermal protection tolerates the wiring mistakes typical of a learning environment without destroying the external MOSFETs. The exposed pad simplifies soldering onto standard TSSOP breakout boards used in education.
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추천 제품 요약
엔지니어링 참조 데이터: A4956KLPTR-T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | A4956KLPTR | A4956KLP-T |
|---|---|---|---|
| Brand | Allegro MicroSystems | Allegro MicroSystems | Allegro MicroSystems |
| Package | 20-TSSOP-EP | 20-TSSOP-EP - same | 20-TSSOP-EP - same |
| Motor Type | Brushed DC | Brushed DC | Brushed DC |
| Supply Voltage Range | 5.5 V to 50 V | 5.5 V to 50 V | 5.5 V to 50 V |
| Topology | Full-bridge external N-FET | Full-bridge external N-FET | Full-bridge external N-FET |
| Charge Pump (100% duty) | Internal | Internal | Internal |
| Overcurrent Protection | Yes (programmable) | Yes (programmable) | Yes (programmable) |
| Lifecycle Status | NOT FOR NEW DESIGN | NOT FOR NEW DESIGN | NOT FOR NEW DESIGN |
| Packaging Format | Tape & Reel (TR) | Tape & Reel (TR) | Tube (T) |
| Automotive Grade | AEC-Q100 (per Microchip USA listing) | AEC-Q100 (per Microchip USA listing) | AEC-Q100 (per Microchip USA listing) |
주요 차별점
- Same-package drop-in with identical pinout and electrical characteristics (vs A4956KLPTR)
- Tube-packaging variant for prototyping and low-volume production (vs A4956KLP-T)
설계 노트
The A4956KLPTR-T's TSSOP-EP package dissipates gate-drive losses through the exposed pad into the PCB copper pour, which must be soldered to a continuous ground-plane island on the top layer and stitched with thermal vias to inner ground planes. Estimated: at 50 V supply, 20 kHz PWM, and 1 nC Qg external MOSFETs, the A4956 gate-drive dissipation is roughly VBB * Qg * fsw = 50 V * 4 * 1e-9 * 20e3 = 40 mW per FET, or ~160 mW total, well within the TSSOP-EP rating when the exposed pad is properly soldered. Without the thermal pad, junction temperature can exceed 125 C even at modest switching frequencies.
Place the bootstrap capacitors (typically 100 nF to 1 uF X7R) directly between each BST pin and the corresponding phase node, with traces shorter than 5 mm to prevent ringing and incomplete high-side enhancement. Place the VCC decoupling capacitor (1 uF ceramic) within 3 mm of the VCC pin, and the charge-pump capacitor (typically 100 nF) close to the CP1/CP2 pins. Keep the high-current motor traces (VBB, phase outputs, GND) physically separated from the logic input traces to prevent dv/dt coupling into the parallel logic interface. A solid ground pour under the exposed pad is mandatory for thermal dissipation.
Common pitfalls with the A4956KLPTR-T include (1) selecting external N-FETs with insufficient VDS rating - use 60 V minimum for the 50 V supply ceiling, (2) omitting the charge-pump capacitor which causes the high-side gate drive to fail at 100% duty cycle, (3) exceeding the logic input maximum ratings by accidentally back-driving the TTL inputs above VCC, (4) not enabling the SLEEPn pin during power-up which can leave the outputs in an undefined state, and (5) failing to size the dead-time resistor which results in shoot-through and catastrophic FET failure. Always assert SLEEPn low at power-up and release it only after VCC and bootstrap capacitors are fully charged.
규정 준수 정보
RoHS compliant per DigiKey and Allegro product listings. AEC-Q100 qualification noted by Microchip USA distributor listing. Halogen-free status not explicitly stated in verified sources. Lifecycle: NOT FOR NEW DESIGN per Allegro datasheet footnote - restricted to existing customer applications.
