TNY277GN - 18.5W Offline Flyback Switcher | Power Integrations
MPN： TNY277GN ✓ 啟用中TNY277GN 概覽
An off-line switcher is a power management IC that converts AC mains voltage directly to a regulated DC output, typically using a flyback or buck topology. It integrates the power switch (MOSFET) and control circuitry into a single package, simplifying the design of AC-DC power supplies. The TinySwitch-III family is a specific series of off-line switchers from Power Integrations, known for their high efficiency, low standby power, and ease of use. These ICs are widely used in chargers, adapters, and auxiliary power supplies.
Key features of the TNY277GN include a 700 V MOSFET for wide input voltage handling, a user-selectable current limit for design flexibility, and built-in thermal shutdown for protection. The device also features frequency jittering to reduce EMI, making it easier to meet electromagnetic compatibility standards. Its ON/OFF control scheme provides excellent load regulation without the need for an optocoupler in many designs, simplifying the feedback loop.
Technically, the TNY277GN uses a current-mode control architecture with a high-voltage switched current source for startup, eliminating the need for a separate startup resistor. The device's EcoSmart technology ensures low standby power consumption, making it suitable for energy-efficient applications. The SMD-8C package is designed for surface-mount assembly, offering a compact footprint for space-constrained designs.
Typical applications include AC-DC adapters, battery chargers, standby power supplies for TVs and monitors, and auxiliary power supplies for appliances. The TNY277GN is particularly well-suited for applications requiring high efficiency and low standby power, such as Energy Star compliant products.
When designing with the TNY277GN, ensure proper transformer design and adequate PCB layout to minimize leakage inductance and EMI. The device's thermal shutdown feature protects against overtemperature conditions, but proper heat sinking through the PCB copper area is recommended for reliable operation at full load.
直接替換替代品，適用於 TNY277GN — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TNY277GN （相同外形與佔位） — 差異在於 Current Limit, Input Voltage Range, Package, Standby Power.
TNY278GN
✅ 直接替換📋 參考替代品（不在目錄中）
TNY276GN
✅ 直接替換📋 參考替代品（不在目錄中）
TNY275GN
✅ 直接替換📋 參考替代品（不在目錄中）
TNY280GN
✅ 直接替換📋 參考替代品（不在目錄中）
TNY279GN
✅ 直接替換📋 參考替代品（不在目錄中）
TNY274GN
✅ 直接替換📋 參考替代品（不在目錄中）
TNY277GN 最大額定值與電氣特性
| Output Power (85-265 VAC) | 18.5 W |
| Output Power (230 VAC) | 23.5 W |
| 切換頻率 | 132 kHz |
| MOSFET Breakdown Voltage | 700 V |
| 拓撲 | Flyback |
| Control Scheme | ON/OFF |
| 封裝 | SMD-8C |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40°C to +150°C |
| 電流限制 | User-selectable |
| 過熱關機 | Yes |
| Frequency Jittering | Yes |
| Standby Power | <50 mW at 230 VAC |
| RoHS 狀態 | Compliant |
| 輸入電壓範圍 | 85 VAC to 265 VAC |
TNY277GN 腳位配置
| 腳位 1 | BP/M — Bypass pin for internal supply, also used for current limit selection |
| 腳位 2 | SOURCE — Source of internal MOSFET |
| 腳位 3 | SOURCE — Source of internal MOSFET |
| 腳位 4 | SOURCE — Source of internal MOSFET |
| 腳位 5 | FEEDBACK — Feedback pin for ON/OFF control |
| 腳位 6 | EN/UV — Enable/Under-voltage pin |
| 腳位 7 | DRAIN — Drain of internal MOSFET |
| 腳位 8 | DRAIN — Drain of internal MOSFET |
典型應用
TNY277GN 適用於 6 應用s: AC-DC Adapters, Battery Chargers, Standby Power Supplies, Auxiliary Power Supplies, LED Lighting, Home Appliances.
AC-DC Adapters
The TNY277GN is ideal for AC-DC adapters used in consumer electronics, providing up to 18.5W output. Its high efficiency and low standby power make it suitable for Energy Star compliant designs. The integrated 700V MOSFET simplifies the design and reduces component count, while the ON/OFF control scheme ensures stable output voltage without complex compensation.
推薦
Battery Chargers
The TNY277GN is well-suited for battery chargers for mobile phones, tablets, and small appliances. Its universal input range (85-265 VAC) allows worldwide use, and the 18.5W output is sufficient for most portable devices. The device's thermal shutdown and current limit features protect the charger and battery from faults, ensuring safe operation.
推薦
Standby Power Supplies
The TNY277GN is perfect for standby power supplies in TVs, monitors, and other appliances. Its low standby power (<50 mW) helps meet energy efficiency regulations. The device's EcoSmart technology reduces power consumption in no-load conditions, making it ideal for always-on applications. The compact SMD-8C package fits into space-constrained designs.
推薦
Auxiliary Power Supplies
The TNY277GN can be used in auxiliary power supplies for industrial equipment, providing a regulated DC rail from AC mains. Its robust 700V MOSFET handles wide input variations, and the thermal shutdown ensures reliability in harsh environments. The device's frequency jittering reduces EMI, simplifying compliance with industrial standards.
推薦
LED Lighting
The TNY277GN is suitable for LED lighting applications, such as LED drivers for residential and commercial lighting. Its high efficiency and low standby power contribute to energy savings. The device's constant voltage output can be used with a constant current stage for LED driving. The compact package allows for slim LED driver designs.
推薦
Home Appliances
The TNY277GN is used in home appliances such as washing machines, refrigerators, and air conditioners for control and display power supplies. Its wide input range and robust protection features make it suitable for appliances that experience voltage fluctuations. The device's low standby power helps appliances meet energy efficiency standards.
推薦
推薦產品摘要
工程參考資料，適用於 TNY277GN — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TNY278GN | TNY276GN | TNY275GN | TNY280GN | TNY279GN | TNY274GN |
|---|---|---|---|---|---|---|---|
| Package | SMD-8C | SMD-8C | SMD-8C | SMD-8C | SMD-8C | SMD-8C | SMD-8C |
| Brand | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations | Power Integrations |
| Output Power (85-265 VAC) | 18.5 W | 21.5 W | 15 W | 11.5 W | 28.5 W | 25 W | 8.5 W |
| Switching Frequency | 132 kHz | 132 kHz | 132 kHz | 132 kHz | 132 kHz | 132 kHz | 132 kHz |
| MOSFET Breakdown Voltage | 700 V | 700 V | 700 V | 700 V | 700 V | 700 V | 700 V |
| Control Scheme | ON/OFF | ON/OFF | ON/OFF | ON/OFF | ON/OFF | ON/OFF | ON/OFF |
| Thermal Shutdown | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Standby Power | <50 mW | <50 mW | <50 mW | <50 mW | <50 mW | <50 mW | <50 mW |
主要差異化特點
- Integrated 700V MOSFET (對比TNY276GN)
- Higher output power than TNY275GN (對比TNY275GN)
- Lower standby power than TNY280GN (對比TNY280GN)
設計說明
For optimal thermal performance, ensure a large copper area on the PCB connected to the SOURCE pins (pins 2, 3, 4). This helps dissipate heat from the internal MOSFET. Use multiple vias to connect the top and bottom layers for better heat spreading. Refer to the TinySwitch-III datasheet for recommended PCB layout guidelines.
The BP/M pin (pin 1) is used for bypassing the internal supply and also for selecting the current limit. Connect a 0.1 µF capacitor between BP/M and SOURCE. Do not leave this pin unconnected. The current limit selection is done by the value of this capacitor; refer to the datasheet for the correct value for your application.
The TNY277GN features frequency jittering to reduce EMI. To further minimize EMI, place a small ferrite bead on the drain connection and ensure the transformer is properly shielded. Follow the layout recommendations in the datasheet to keep the high-voltage traces short and away from sensitive control circuitry.
合規資訊
RoHS compliant per Power Integrations. Not AEC-Q100 qualified as it is not an automotive-grade part.
