TNY277PN - 18.5W Flyback Switcher IC | Power Integrations
料号： TNY277PN ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.12 | $1.12 |
| 10 | $1.03 | $10.30 |
| 100 | $0.91 | $91.00 |
| 500 | $0.84 | $420.00 |
| 1,000 | $0.78 | $780.00 |
TNY277PN 概述
An offline switcher is a power-management integrated circuit that accepts rectified AC line voltage and performs high-frequency switching to provide one or more isolated DC outputs through a flyback transformer. The TinySwitch-III family is a subcategory of AC-DC converters, which sit above linear regulators and standard DC-DC converters in the power conversion hierarchy. By integrating the power MOSFET and controller on one chip, offline switcher ICs reduce BOM count, simplify PCB layout, and improve reliability compared to discrete controller-plus-MOSFET implementations.
Key features of the TNY277PN include the built-in 700 V power MOSFET, which provides wide margin for line-voltage spikes and improves surge robustness. The integrated high-voltage switched current source accelerates startup and reduces no-load input power. The user-selectable current limit lets designers optimize transformer size for the target power level, while the 132 kHz switching frequency balances transformer size against switching losses. Thermal shutdown protects the IC against secondary-side overload or fault conditions.
In operation, the IC uses a simple ON/OFF control scheme that requires no external loop compensation. The internal oscillator controls the power MOSFET duty cycle; when output feedback demands energy, the MOSFET switches, then enters a low-power state. This burst-mode operation at light load reduces standby losses and is especially useful for Energy Star-compliant adapters. The through-hole 8-pin DIP package simplifies assembly and helps transfer heat to PCB copper in moderate-power designs.
Typical applications include AC/DC adapters and battery chargers, standby and auxiliary power supplies for appliances, LED drivers, industrial control supplies, and IoT smart-home power modules. The flyback topology pairs with inexpensive transformers and standard optocoupler/TL431 feedback networks.
When designing with TNY277PN, pay attention to drain snubber selection, transformer leakage inductance, and BP/M pin decoupling. A well-laid-out PCB with tight loop areas is critical for meeting conducted EMI limits.
直接替换替代料： TNY277PN ——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： TNY277PN （相同外形与封装尺寸） ——差异在于 Package.
快速对比工具——选择替代料号进行并排对比：
TNY276PN
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TNY277PG
✅ 直接替换✓ 有现货
$0.75 / 个
查看数据手册 →TNY278PN
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TNY279PN
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TNY280PN
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
TNY277PN 最大额定值与电气特性
| 拓扑 | Flyback |
| 开关频率 | 132 kHz |
| Built-in Power MOSFET | 700 V |
| Max Output Power (85-265 VAC) | 18.5 W |
| Max Output Power (230 VAC) | 23.5 W |
| 封装 | 8-PDIP-C |
| 安装类型 | Through Hole |
| Control Scheme | ON/OFF |
| 限流 | User selectable |
| High-Voltage Switched Current Source | Yes |
| 热关断 | Yes |
| Startup Circuitry | Integrated high-voltage switched current source |
TNY277PN 8-pdip-c 引脚配置指南
TNY277PN（8-pdip-c 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： TNY277PN.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TNY277PN 适用于 6 应用s: AC/DC Adapters and Battery Chargers, Standby and Auxiliary Power Supplies, Appliance Power Supplies, LED Power Supplies and Lighting, Industrial Control Power Supplies, IoT and Smart Home Power Modules.
AC/DC Adapters and Battery Chargers
The TNY277PN is suited to 5V/2A and 12V/1.5A AC/DC adapters because its 18.5 W universal-input rating provides headroom for load transients. The integrated 700 V MOSFET reduces external component count, and the 132 kHz oscillator allows a small transformer. In typical flyback adapter designs, optocoupler feedback drives the EN/UV pin and a TL431 is used for output-voltage regulation. This IC simplifies charger production while meeting no-load loss expectations for modern adapters.
推荐
Standby and Auxiliary Power Supplies
TNY277PN is well suited for standby supplies that must stay energized while the main system is off. Its ON/OFF control enables low standby consumption and the 700 V MOSFET provides robust line-surge tolerance for appliance power boards. As an auxiliary supply, it can generate a clean 12V or 5V rail from the AC line using a simple flyback stage. The built-in current limit and thermal shutdown protect the IC during fault conditions common in appliance environments.
推荐
Appliance Power Supplies
For washing machines, refrigerators, and stove control boards, TNY277PN provides a cost-effective 18.5W flyback supply for control electronics, relays, and displays. The through-hole 8-PDIP-C package is easy to assemble in conventional appliance PCBs, and the 700 V integrated MOSFET withstands high-voltage AC line transients. Designers can configure the current limit to match the transformer and load. Its thermal shutdown and simple ON/OFF control reduce firmware-side power-sequencing complexity in white-goods applications.
推荐
LED Power Supplies and Lighting
LED lighting panels and bulbs can use TNY277PN as the core of an isolated offline LED driver. The 18.5W universal input power supports many 15W LED modules, while the 700 V MOSFET and current-limit selection allow the transformer to be optimized for constant-voltage or constant-current output. The IC's low standby power helps meet residential lighting efficiency requirements. Its flyback topology is compatible with secondary-side constant-current feedback circuits using TL431 and current-sense resistors.
推荐
Industrial Control Power Supplies
In industrial sensors, PLCs, and motor-control panels, TNY277PN supplies clean DC power for microcontrollers and communication interfaces. Its 85-265 VAC universal input makes it suitable for worldwide installations, while the 700 V MOSFET gives extra safety margin against industrial mains transients. The user-selectable current limit can be tuned to the transformer overcurrent protection. Tight load regulation is achievable through standard optocoupler/TL431 feedback, and the 132 kHz frequency keeps the magnetic components compact for DIN-rail or panel-mount form factors.
推荐
IoT and Smart Home Power Modules
Smart home hubs, Wi-Fi modules, and sensor bridges need compact isolated power supplies. TNY277PN can deliver up to 18.5W universal input, enough to power a main board plus accessories. The integrated 700 V MOSFET and high-voltage current source reduce BOM size, while the low standby power helps smart devices meet energy-use requirements. The flyback converter can be designed with a small E20/E25 transformer and optocoupler feedback to create a reliable 5V rail for IoT processors, wireless transceivers, and sensors.
推荐
推荐产品汇总
工程参考数据： TNY277PN ——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 | TNY276PN | TNY277PG | TNY278PN | TNY279PN | TNY280PN |
|---|---|---|---|---|---|---|
| Brand | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations |
| Package | 8-PDIP-C | 8-PDIP-C | 8-PDIP-C | 8-PDIP-C | 8-PDIP-C | 8-PDIP-C |
关键差异点
- 18.5 W universal input rating provides margin for common 10-15 W adapter designs （对比 TNY276PN)
- Balanced power class for cost-sensitive flyback supplies （对比 TNY280PN)
- Verified cross-reference visibility of TNY277PG （对比 TNY277PG)
设计说明
Do not leave BP/M pin floating. Connect the recommended BP/M capacitor, typically a 0.1uF ceramic capacitor, close to the IC. This capacitor supplies gate-drive current and sets the internal supply voltage. In TinySwitch-III designs, the BP/M pin can also accept an external current-limit set resistor in some configurations, as described in the Power Integrations datasheet.
The TNY277PN uses an 8-PDIP-C through-hole package that relies on PCB copper and the lead frame for heat removal. For continuous operation near 18.5 W universal input, provide adequate copper area around drain and source leads, preferably on both top and bottom layers. Junction temperature must stay within datasheet limits; if case temperature is high, redesign the transformer or improve air flow rather than increasing copper indefinitely.
Minimize the high-frequency drain loop by placing the transformer primary, rectifier diode, and bulk capacitor close to the drain and source pins. Keep the feedback optocoupler and TL431 sense traces short. Add a Y-capacitor between primary and secondary for common-mode EMI and follow appropriate creepage and clearance distances for the AC input voltage class.
合规信息
Verified web snippets did not include explicit RoHS/REACH certification details. Refer to the Power Integrations datasheet and product page for current compliance documentation.
