TEA1721AT/N1 - 700V Flyback SMPS Controller, 5W | NXP
부품 번호: TEA1721AT/N1 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.28 | $128.00 |
| 500 | $1.05 | $525.00 |
| 1,000 | $0.92 | $920.00 |
| 2,500 | $0.84 | $2,100.00 |
TEA1721AT/N1 개요
A flyback controller is a type of switched-mode power supply (SMPS) topology that stores energy in the primary-side transformer's magnetic field during the MOSFET on-time and releases it to the secondary winding during the off-time, providing galvanic isolation between mains and low-voltage outputs. The TEA1721AT/N1 belongs to the AC-DC controller category within the broader Power Management IC hierarchy and is designed for isolated, non-isolated, and auxiliary power supply applications where eliminating external high-voltage startup components is critical.
Key features include a 700V integrated power switch, 22.5 kHz to 50.5 kHz programmable switching frequency, 430 Hz burst-mode frequency for ultra-low standby power, valley and demag detection for quasi-resonant operation, and comprehensive protection circuitry including over-temperature, over-current, and short-winding protection. The integrated high-voltage startup eliminates the need for an external startup resistor network, reducing BOM count and PCB footprint.
The TEA1721AT/N1's high-voltage integration and quasi-resonant valley switching architecture maximize efficiency across the entire load range. The internal MOSFET supports universal mains input (85 VAC to 265 VAC) without auxiliary high-voltage components, simplifying layout and reducing standby power to industry-leading levels required for ENERGY STAR and EU Ecodesign compliance. Typical applications include 5W mobile phone chargers, standby power supplies for white goods and appliance control, IoT and smart home low-power modules, and auxiliary supplies for larger power systems.
드롭인 대체품: TEA1721AT/N1 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
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✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TEA1721AT/N1/S1J
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
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✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
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✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
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✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LNK3204P
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TEA1721AT/N1 최대 정격 & 전기적 특성
| 토폴로지 | Flyback (non-isolated or isolated) |
| 기능 | Offline SMPS controller with integrated MOSFET |
| Output Power | Up to 5 W |
| Integrated Power Switch (Drain-Source Breakdown) | 700 V |
| 입력 전압 범위 | Universal rectified mains (85 VAC to 265 VAC) |
| 스위칭 주파수 | 22.5 kHz to 50.5 kHz |
| Burst-Mode Frequency | 430 Hz |
| Supply Current (Quiescent) | 970 uA |
| Supply Voltage (VCC max) | 35 V |
| 동작 온도 범위 | -40C to +150C (junction) |
| Start-up Method | High-voltage integrated start-up (no external resistor) |
| Valley Detection | Yes (quasi-resonant demag) |
| Protection Features | Over-temperature, over-current, short-winding, OVP |
| 패키지 | SO-7 (SOIC-7, SOT1175-1), 3.9 mm body width |
| 실장 유형 | Surface Mount |
| Lead-Free / RoHS | Yes (compliant) |
| MSL 레벨 | 3 (per JEDEC J-STD-020) |
TEA1721AT/N1 핀 구성
| 핀 1 | DRAIN — Drain of the integrated 700V MOSFET; connected to the transformer primary winding |
| 핀 2 | GND — Ground / return for the controller and source of the internal MOSFET |
| 핀 3 | VCC — Supply voltage for the controller; decoupled with electrolytic + ceramic capacitor |
| 핀 4 | FB — Feedback input; senses optocoupler current to regulate output |
| 핀 5 | DMODE / DEMAG — Demagnetization detection input; samples auxiliary winding for valley switching and protection |
| 핀 6 | RC — RC oscillator / timing component; sets switching frequency |
| 핀 7 | DRAIN (TAB) — Exposed drain tab - heat sink / Kelvin drain return path (per SOT1175-1 datasheet) |
일반적인 애플리케이션
TEA1721AT/N1 적합 용도: 6 애플리케이션s: 5W Mobile Phone / USB Charger, White Goods Standby Power Supply, IoT / Smart Home Low-Power Module, Auxiliary Power Supply for Larger SMPS Systems, AC-DC Adapter / Wall-Wart Power Supply, LED Lighting Driver Auxiliary / Standby Rail.
5W Mobile Phone / USB Charger
The TEA1721AT/N1's 5W flyback capability and 700V integrated MOSFET make it a direct fit for compact 5V/1A mobile-phone and low-power USB chargers operating from universal mains (85-265 VAC). The integrated 700V high-voltage switch eliminates discrete MOSFETs and external startup resistor chains, reducing BOM cost and PCB footprint. With 22.5-50.5 kHz quasi-resonant switching and valley switching, EMI emissions stay within EN 55022 Class B limits when paired with a small EE13 transformer and a Y2 safety capacitor. The 430 Hz burst-mode frequency delivers <30 mW standby power, comfortably satisfying EU Ecodesign Lot 6 Tier 2 and U.S. DOE Level VI charger-efficiency requirements for retail OEMs.
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White Goods Standby Power Supply
Major appliances (washing machines, refrigerators, dishwashers, ovens) require <100 mW standby power per EU regulations. The TEA1721AT/N1's 22.5-50.5 kHz switching with 430 Hz burst mode achieves the ultra-low no-load losses needed for ENERGY STAR and EU Ecodesign compliance in these applications. The 700V integrated device operates directly across the universal mains range without auxiliary 310 V rails, simplifying the auxiliary SMPS design. Its -40C to +150C junction temperature range tolerates the high-ambient conditions inside appliance enclosures during cooking or motor-start events, while protections like short-winding and over-temperature auto-recovery extend field reliability.
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IoT / Smart Home Low-Power Module
Wi-Fi smart switches, smart speakers, and IoT gateways frequently derive standby rails from a 5W or smaller flyback converter because they remain always-on. The TEA1721AT/N1's 970 uA quiescent current and 430 Hz burst mode minimize standby drain on the always-on rail. Its SO-7 (SOT1175-1) package allows integration into the small-form-factor smart-home wall outlets and behind-switch modules required by the smart-home market. Integrated OVP, OTP, and short-winding protections provide the robustness needed for in-wall installations where field-replaceable fuses are impractical and where the device must survive line transients and inductive kickback from adjacent relay circuits.
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Auxiliary Power Supply for Larger SMPS Systems
Higher-power SMPS systems (industrial motor drives, telecom rectifiers, server PSUs) often include a small auxiliary supply deriving 5-15V for housekeeping functions. The TEA1721AT/N1 is optimized for these auxiliary roles with its 700V startup-from-mains capability and 35V VCC rating. Designers place it on the high-voltage bus (after the PFC front end) where its 700V MOSFET is sized to handle 385 VDC PFC output plus transients comfortably. The auxiliary output then provides the housekeeping power that runs the PFC and main-stage control ICs and the bias supply for fans and optocouplers, enabling full system operation without requiring a separate low-power main converter.
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AC-DC Adapter / Wall-Wart Power Supply
White-label wall-wart adapters and industrial low-power bricks benefit from the TEA1721AT/N1's small SO-7 footprint and 700V monolithic integration. The device supports up to 5W continuous output from universal mains while maintaining low standby power, fitting directly into the global wall-wart supply chain. Designers can reuse the same low-cost transformer across 5V/1A, 12V/0.4A, 9V/0.55A, and similar variants by simply adjusting the resistor divider and turn ratio, thanks to the wide 22.5-50.5 kHz switching range. Competitive BOM cost (compared with discrete-controller + 800V MOSFET designs) makes it attractive for high-volume adapter production.
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LED Lighting Driver Auxiliary / Standby Rail
Many commercial LED drivers (0.5-10W class) require a small auxiliary rail for MCU and 0-10V analog dimming interfaces. The TEA1721AT/N1 is well-matched for these always-on standby rails with its 5W capacity, 700V integration, and ultra-low standby. Its 50.5 kHz maximum switching frequency keeps transformer size small for in-fixture installation, while the 430 Hz burst mode keeps standby power low enough for DLC-qualified lighting products. The high-temperature-grade SO-7 package performs reliably inside sealed LED luminaires where ambient temperatures can exceed 70C, and the integrated protections reduce field returns on lighting installations.
추천
추천 제품 요약
엔지니어링 참조 데이터: TEA1721AT/N1 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | TEA1721BT/N1,118 | TEA1721AT/N1/S1J | TEA1721A3T/N1/S2J | NCP1014ST65T3G | LNK3204P |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | onsemi | Power Integrations |
| Package | SO-7 (SOT1175-1) - body width 3.9 mm | SO-7 (SOT1175-1) - same | SO-7 (SOT1175-1) - same | SO-7 (SOT1175-1) - same | SOT-223 equivalent SMD outline | DIP-8B / SO-8B equivalent |
| Integrated MOSFET Breakdown Voltage | 700 V | 700 V | 700 V | 700 V | 700 V | 700 V |
| Maximum Output Power | 5 W | 5 W | 5 W | 5 W (A3 variant) | 5.1 W | 4.5 W |
| Switching Frequency | 22.5 kHz to 50.5 kHz (quasi-resonant) | 22.5 kHz to 50.5 kHz | 22.5 kHz to 50.5 kHz | 22.5 kHz to 50.5 kHz | 65 kHz (fixed) | 66 kHz (typical) |
| Topology | Flyback (isolated or non-isolated) | Flyback | Flyback | Flyback | Flyback | Flyback / Buck-Boost |
| Operating Temperature Range | -40C to +150C (junction) | -40C to +150C | -40C to +150C | -40C to +150C | -40C to +150C | -40C to +150C |
주요 차별점
- Industry-leading ultra-low standby via 430 Hz burst mode (vs vs discrete UC3842 controller + 800V MOSFET design)
- Integrated 700V MOSFET eliminates 3-4 external components (vs vs UCC28740DBVR (TI quasi-resonant controller requiring external MOSFET))
- Quasi-resonant valley switching minimizes EMI (vs vs fixed-frequency controllers like TNY274GN (132 kHz PWM))
- Compact SO-7 (SOT1175-1) package (vs vs DIP-8B packages such as Power Integrations LNK3204P)
설계 노트
Estimated: at 5W output and a worst-case 85% efficiency from universal mains, the TEA1721AT/N1 dissipates approximately 0.88 W internally. With the SO-7 (SOT1175-1) package thermal resistance around 45 C/W (typical, per JEDEC EIA/JESD51-2 1-oz 4-layer test board), the junction temperature rise above ambient is roughly 39.6 C - well within the +150 C limit. Designers should still provide an exposed copper pour of at least 50 mm^2 on the drain tab to keep case temperature manageable in sealed adapters, where ambient may reach 70 C.
Place the input bulk capacitor (typically 4.7-22 uF / 400V) and the drain-snubber network as close as possible to pins 1 and 2 of the TEA1721AT/N1 to minimize switching node parasitic inductance. Per the NXP design guidelines, the secondary-side optocoupler emitter-to-VCC trace should be kept short, and the Y1 safety capacitor (typically 2.2 nF) between primary GND (pin 2) and secondary GND must be placed at the isolation barrier to maintain 4 mm creepage distance - smaller creepage risks compliance failure per IEC 60950-1 / IEC 62368-1.
The 700V drain pin (pin 1) requires a 4 mm minimum clearance to all secondary-side traces per IEC 60950-1 / IEC 62368-1 universal-mains standards. Route the VCC decoupling capacitor (100 nF X7R + 22-100 uF electrolytic) directly at pin 3 with the shortest possible lead to pin 2 GND. Keep the FB trace (pin 4) at least 2 mm from the drain node to avoid capacitive coupling that could destabilize the control loop. The RC oscillator resistor and capacitor (pin 6) should be adjacent to the IC; long traces here produce frequency jitter under transient loads.
Do not rely solely on the integrated 700V MOSFET's breakdown voltage for transient protection - pair the device with an MOV or TVS across the rectified mains and a 1.25A slow-blow fuse per UL 60950. The auxiliary winding polarity must be observed exactly as documented in the NXP datasheet; reversing the auxiliary winding disables valley switching and over-voltage protection. Finally, the VCC capacitor should be sized large enough (typically 22-100 uF) to sustain operation through VCC undervoltage-lockout dips caused by mains brownouts, otherwise the controller will hiccup.
The DEMAG input (pin 5) is sensitive to noise and must be filtered with an RC network (typically 100 ohms and 47 pF) to suppress ringing during the demagnetization event; otherwise false demag detection reduces efficiency. The FB optocoupler pullup resistor must be sized to allow at least 1 mA of optocoupler diode current at minimum mains (85 VAC), which under worst-case optocoupler CTR (Current Transfer Ratio) of 50% guarantees loop closure. Use a TL431 + optocoupler combination on the secondary for best line and load regulation - simpler Zener-based feedback compromises regulation below 1%.
규정 준수 정보
RoHS compliant per NXP product page ordering information; SOT1175-1 package designated as lead-free per datasheet. Not AEC-Q100 qualified - not automotive grade. Halogen-free status not explicitly stated in retrieved data, marked unknown.
