TOP243YN - 30W AC/DC Off-line Switcher, TO-220-7C | Power Integrations
料号： TOP243YN ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.38 | $138.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $1.05 | $1,050.00 |
TOP243YN 概述
An off-line switcher, also called an AC-DC converter or isolated flyback controller, takes the rectified mains voltage directly on its drain and produces an isolated, regulated DC output without requiring a separate low-voltage supply rail for primary-side control. The TOP243YN belongs to the broader family of power management ICs (PMICs) and specifically the flyback / SMPS (switched-mode power supply) controller category. It is positioned above linear regulators (which cannot step down from rectified mains efficiently) and below PFC+LLC combo controllers in capability, occupying the mainstream isolated-output power-supply segment.
Key features of the TOP243YN include 66 kHz to 132 kHz PWM switching frequency with frequency jittering for EMI reduction, integrated soft-start, cycle-by-cycle current limiting, over-temperature shutdown, over-voltage protection, and EcoSmart low standby power (<1W at 265 VAC). The drain voltage rating is 700V, the on-resistance is approximately 2.2 ohm, and the peak current limit is 3.0A. Frequency and current-limit characteristics are selected by device letter code (TOP243 -> 'P' frequency, 'G' current limit) so the same Y-package pinout applies across the family.
The internal architecture pairs a high-voltage start-up bias circuit with an analog PWM engine, eliminating auxiliary winding bias requirements in many designs and reducing BOM count by 12-20 components compared with discrete UC3842-style implementations. EcoSmart technology lets the controller drop below 1W no-load consumption, satisfying CEC and ENERGY STAR standby requirements for adapter and appliance applications.
Typical applications include low-power AC-DC adapters (laptop bricks, set-top boxes, printers), standby supplies in white goods and industrial controls, appliance power modules, and auxiliary supplies for larger PFC systems. The TO-220-7C package with a metal tab allows direct PCB heatsinking without an insulator pad when correctly grounded.
When designing with this device, ensure adequate creepage distance between the drain tab and any secondary-side traces to meet IEC 60950 / IEC 62368 reinforced-isolation rules, and select input bulk capacitance per the datasheet's universal-input vs single-230V table. Always check the TOP24x letter code page in the datasheet to confirm frequency and current-limit variant match your application.
直接替换替代料： TOP243YN ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TOP243YN （相同外形与封装尺寸） ——差异在于 Input Voltage Range, Package, Switching Frequency, Topology.
快速对比工具——选择替代料号进行并排对比：
TOP244YN
✅ 直接替换📋 参考替代料（不在目录中）
TOP245YN
✅ 直接替换📋 参考替代料（不在目录中）
TOP246YN
✅ 直接替换📋 参考替代料（不在目录中）
TOP247YN
✅ 直接替换✓ 有现货
$2.18 / 个
查看数据手册 →TOP242YN
✅ 直接替换📋 参考替代料（不在目录中）
TOP243YN 最大额定值与电气特性
| Series | TOPSwitch-GX |
| 拓扑 | Offline Flyback |
| Output Isolation | Isolated |
| 开关频率 | 66 kHz to 132 kHz |
| Drain-Source Voltage (Vdss) | 700 V |
| On-State Resistance (Rds(on)) | 2.2 ohm (typical) |
| Peak Current Limit | 3.0 A |
| Output Power (universal 85-265 VAC) | 30 W |
| Output Power (230 VAC single) | 45 W |
| 输入电压范围 | 85 VAC to 265 VAC |
| 工作温度 | -40 C to +150 C (junction) |
| 封装 | TO-220-7C (Y) through-hole |
| 安装类型 | Through Hole |
| 引脚数 | 7 |
| Built-in Protection | Over-temperature, over-current, over-voltage, latch |
| Standby Power (EcoSmart) | <1 W at 265 VAC no-load |
| 软启动 | Integrated |
| RoHS 状态 | Compliant |
| MSL 等级 | Not applicable (through-hole) |
TOP243YN 引脚配置
| 引脚 1 | SOURCE — Power MOSFET source and control ground reference |
| 引脚 2 | SOURCE / NC — Variant-dependent source or no-connect (verify per datasheet) |
| 引脚 3 | DRAIN — High-voltage power MOSFET drain |
| 引脚 4 | DRAIN — High-voltage power MOSFET drain |
| 引脚 5 | DRAIN — High-voltage power MOSFET drain |
| 引脚 6 | CONTROL — Error amplifier compensation and bias current input |
| 引脚 7 | NC — Not connected on standard variant (or tied to tab on some variants) |
TOP243YN 安全工作区 (estimated, per datasheet derating curves)
典型应用
TOP243YN 适用于 6 应用s: Low-Power AC-DC Adapter, White Goods Standby Supply, Industrial Auxiliary Supply, Auxiliary Supply for PFC System, LED Driver Power Stage, Appliance Motor Drive Auxiliary Rail.
Low-Power AC-DC Adapter
The TOP243YN is well-suited for low-power universal-input AC-DC adapters such as those powering set-top boxes, printers, modems, and small appliances. Its 30W rating at 85-265 VAC and 700V drain rating cover worldwide single-rail mains without a separate low-voltage bias supply. The integrated soft-start and EcoSmart standby (<1W at 265 VAC no-load) help designs meet ENERGY STAR and CEC Tier 2 standby limits. The TO-220-7C tab can be soldered directly to a copper pour, providing adequate heatsinking at 25W continuous. Compared to UC3842 + discrete MOSFET approaches, the TOP243YN cuts the BOM by approximately 15-20 components and removes the need for an auxiliary winding to power the primary controller in many low-power configurations.
推荐
White Goods Standby Supply
In washing machines, dishwashers, and refrigerators, the TOP243YN serves as a 5-12V standby supply that remains powered when the main appliance is off, providing housekeeping current to microcontrollers and BLE modules. Its 700V drain withstands wide rectified-mains transients and the integrated OVP/OTP eliminates the auxiliary supervisory components required by discrete designs. EcoSmart standby below 1W is essential for compliance with EU 1275/2008 standby regulation. The TO-220-7C package allows PCB mounting in horizontal or vertical orientation, fitting confined appliance enclosures. For designs that exceed 30W peak load, designers select TOP244YN or TOP245YN with the same footprint.
推荐
Industrial Auxiliary Supply
Within industrial 24V-bus systems, the TOP243YN generates isolated 5V, 12V, or 15V rails for control circuitry, sensor excitation, and relay drivers. The 700V drain tolerates rectified 230 VAC plus 20% over-voltage transients and the cycle-by-cycle current limit protects the transformer against saturation faults. Frequency jittering (66-132 kHz) reduces conducted EMI, helping designs meet EN 55011 Class B without expensive shielding. The TO-220-7C package is rugged in high-vibration factory environments and provides a direct PCB-mount heatsink. Designers should size the snubber and clamp per the datasheet's universal-input table.
推荐
Auxiliary Supply for PFC System
The TOP243YN is commonly used as an auxiliary Vcc supply downstream of a PFC boost stage, providing housekeeping current to PFC controller and gate drivers before the main converter starts. Its integrated 700V MOSFET handles the 400V PFC bulk rail directly without a separate startup circuit. The EcoSmart feature keeps standby below 1W when the main converter is in standby, important for meeting DOE Level VI external adapter limits. Frequency jittering prevents the auxiliary supply from interfering with PFC or main-converter EMI signatures. The same TO-220-7C pinout allows simple PCB replacement during design scaling.
推荐
LED Driver Power Stage
The TOP243YN supports isolated constant-current LED drivers in the 15-30W range, such as those for architectural downlights, panel indicators, and signage backlights. The 700V drain with integrated MOSFET handles rectified 230 VAC with adequate margin for surge events. Cycle-by-cycle current limit and thermal shutdown protect the LED string against output short or overload faults. The EcoSmart standby helps drivers comply with EU 1194/2012 standby regulation when the lighting is in the off state. The TO-220-7C tab is convenient for direct chassis-mount heatsinking in luminaire designs.
推荐
Appliance Motor Drive Auxiliary Rail
In fans, range hoods, and small motor drives, the TOP243YN provides isolated 12V or 15V rails for MCU logic, sensor signal conditioning, and gate-driver bootstrap networks. Its integrated fault protection (over-current, over-voltage, over-temperature) is essential for unattended appliance environments where component failures must not propagate. The 700V drain withstands wide rectified-mains variations including brownout recovery surges. Compared to discrete RC-snubber + UC3842 designs, the TOP243YN reduces PCB footprint by roughly 40% and eliminates the need for a separate high-voltage start-up transistor.
推荐
推荐产品汇总
工程参考数据： TOP243YN ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TOP244YN | TOP245YN | TOP246YN | TOP247YN | TOP242YN |
|---|---|---|---|---|---|---|
| Brand | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations |
| Package | TO-220-7C (Y) | TO-220-7C (Y) - same | TO-220-7C (Y) - same | TO-220-7C (Y) - same | TO-220-7C (Y) - same | TO-220-7C (Y) - same |
| Topology | Offline Flyback | Offline Flyback | Offline Flyback | Offline Flyback | Offline Flyback | Offline Flyback |
| Drain-Source Voltage | 700 V | 700 V | 700 V | 700 V | 700 V | 700 V |
| Peak Current Limit | 3.0 A | 3.5 A | 4.1 A | 5.2 A | 6.3 A | 2.2 A |
| Output Power (85-265 VAC) | 30 W | 36 W | 60 W | 75 W | 90 W | 15 W |
| Output Power (230 VAC single) | 45 W | 50 W | 85 W | 110 W | 135 W | 22 W |
| Switching Frequency | 66-132 kHz | 66-132 kHz | 66-132 kHz | 66-132 kHz | 66-132 kHz | 66-132 kHz |
| Built-in Protection | OCP, OTP, OVP, latch | OCP, OTP, OVP, latch | OCP, OTP, OVP, latch | OCP, OTP, OVP, latch | OCP, OTP, OVP, latch | OCP, OTP, OVP, latch |
| EcoSmart Standby | <1 W at 265 VAC | <1 W at 265 VAC | <1 W at 265 VAC | <1 W at 265 VAC | <1 W at 265 VAC | <1 W at 265 VAC |
关键差异点
- Highest 700V drain rating in the TOPSwitch-GX family （对比 All TOPSwitch-GX siblings)
- 30W/45W universal/single-rail power capacity （对比 TOP242YN)
- Integrated EcoSmart standby below 1W （对比 discrete UC3842 + MOSFET)
- Drop-in compatible with all TOP242YN-TOP247YN Y-package siblings （对比 TOP246YN)
设计说明
Route the high-voltage drain trace on the top copper layer with at least 6 mm clearance to any secondary-side trace to satisfy IEC 60950 / IEC 62368 reinforced isolation. Place the Y-capacitor return ground directly under the transformer footprint and use a single-point ground tie on the primary side to minimize common-mode EMI. The TO-220-7C tab is internally tied to DRAIN, so heatsinking the tab requires an insulated pad or thermal pad with sufficient isolation rating.
Estimated: at 25W output from a 230 VAC universal input, the TOP243YN dissipates roughly 1.0-1.5W in the internal MOSFET. The TO-220-7C package has a junction-to-ambient thermal resistance (theta_JA) of approximately 40-45 C/W on a 1 square-inch copper pour, yielding a junction temperature rise of 50-70 C above ambient. For sealed adapters, derate to 20W continuous or provide a chassis-mounted heatsink with thermal pad.
Do not exceed 700V on the drain including ringing transients. Use a primary-side RCD clamp or TVS plus sufficient damping to limit peak drain voltage below 80% of Vdss (560V) under all line/load conditions. Also avoid leaving the CONTROL pin floating: it must have a 47 uF bypass capacitor per the datasheet, or the device will not regulate properly and may latch off. Always verify the letter-code page in the TOPSwitch-GX datasheet when substituting TOP242YN-TOP247YN - each variant has unique frequency and current-limit settings.
Place the input bulk capacitor directly across the drain and source pins to minimize high-frequency switching loop area, which directly reduces radiated EMI. Keep the CONTROL pin trace short and shielded by ground copper to prevent false triggering. Place the optocoupler and TL431 network within 1 cm of the secondary-side winding termination to minimize feedback trace noise pickup.
合规信息
RoHS and lead-free confirmed by Power Integrations product page. Not AEC-Q100 qualified (TOPSwitch-GX is targeted at consumer/industrial mains applications, not automotive).
