TNY277GN-TL - 18.5W Offline Flyback Switcher | Power Integrations
MPN: TNY277GN-TL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.25 | $1.25 |
| 10 | $1.12 | $11.20 |
| 100 | $0.97 | $97.00 |
| 500 | $0.85 | $425.00 |
| 1,000 | $0.75 | $750.00 |
TNY277GN-TL Overview
TinySwitch-III is a family of energy-efficient, low-power offline switchers that use a simple ON/OFF control scheme, eliminating the need for loop compensation. This simplifies design and reduces component count, lowering system cost. The IC operates at a fixed frequency of 132 kHz with frequency jittering to reduce EMI, and includes a user-selectable current limit to optimize efficiency and power delivery.
Key features include a 700 V power MOSFET, integrated oscillator, high-voltage switched current source for fast startup, current limit selection, and comprehensive protection features such as over-temperature protection, overvoltage protection, and line undervoltage detection. The EN/UV pin senses line undervoltage through an external resistor, and if absent, disables the line undervoltage function. The device also features leading edge blanking to prevent false triggering.
The TNY277GN-TL is designed for high efficiency and low standby power, meeting energy efficiency standards. Its integrated 700 V MOSFET allows direct connection to the rectified AC line, simplifying the primary-side circuit. The SMD-8C package with gull-wing leads is suitable for automated assembly and provides good thermal performance.
Typical applications include auxiliary power supplies for appliances, standby power for TVs and monitors, AC-DC adapters, and industrial control power supplies. The wide input voltage range and robust protection make it suitable for global applications.
When designing with this device, ensure proper PCB layout with adequate creepage distances for high-voltage isolation, and follow the recommended transformer design in the datasheet to achieve optimal performance and EMI compliance.
Drop-in alternatives for TNY277GN-TL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with TNY277GN-TL (same form factor and footprint) — differing in Current Limit, Input Voltage Range, Package, Standby Power.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TNY277GN
✅ Drop-In✓ In Stock
$0.75 / Unit
View Datasheet →TNY276GN
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TNY278GN
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TNY277GN-TL Maximum Ratings & Electrical Characteristics
| Output Power (85-265 VAC) | 18.5 W |
| Output Power (230 VAC) | 23.5 W |
| Switching Frequency | 132 kHz |
| MOSFET Breakdown Voltage | 700 V |
| Package | SMD-8C (7 leads) |
| Topology | Flyback |
| Control Scheme | ON/OFF |
| Current Limit | User selectable |
| Operating Temperature Range | -40°C to +150°C |
| Input Voltage Range | 85-265 VAC |
| Standby Power | <50 mW |
| Frequency Jitter | Yes |
| Line Undervoltage Detection | Yes (via EN/UV pin) |
| Overvoltage Protection | Yes |
| RoHS Status | Compliant |
TNY277GN-TL Pin Configuration
| Pin 1 | EN/UV — Enable and line undervoltage sense |
| Pin 2 | BP/M — Bypass pin for internal supply and multifunction |
| Pin 3 | SOURCE — Source of internal MOSFET |
| Pin 4 | DRAIN — Drain of internal MOSFET |
| Pin 5 | SOURCE — Source of internal MOSFET |
| Pin 6 | SOURCE — Source of internal MOSFET |
| Pin 7 | SOURCE — Source of internal MOSFET |
Typical Applications
TNY277GN-TL is suitable for 6 applications: Auxiliary Power Supplies, Standby Power for TVs and Monitors, AC-DC Adapters, Industrial Control Power Supplies, LED Lighting Power Supplies, IoT and Smart Home Devices.
Auxiliary Power Supplies
The TNY277GN-TL is ideal for auxiliary power supplies in appliances and industrial equipment, providing up to 18.5W from a universal input. Its integrated 700V MOSFET and ON/OFF control simplify the design, reducing component count and cost. The wide input range and robust protection ensure reliable operation in demanding environments.
Recommended
Standby Power for TVs and Monitors
With low standby power (<50mW) and high efficiency, the TNY277GN-TL is perfect for standby power supplies in TVs and monitors. It meets energy efficiency standards and provides a compact solution. The frequency jitter reduces EMI, simplifying compliance testing.
Recommended
AC-DC Adapters
The TNY277GN-TL can be used in AC-DC adapters for consumer electronics, delivering up to 18.5W. Its integrated MOSFET and simple control scheme reduce external components, making the adapter compact and cost-effective. The device's thermal shutdown and overvoltage protection enhance reliability.
Recommended
Industrial Control Power Supplies
For industrial control systems, the TNY277GN-TL provides a robust power solution with wide input voltage range and comprehensive protection. Its 700V MOSFET handles high-voltage transients, and the line undervoltage detection ensures stable operation. The SMD-8C package is suitable for automated assembly in high-volume production.
Recommended
LED Lighting Power Supplies
The TNY277GN-TL can be used in LED lighting power supplies, providing constant voltage or current with proper feedback. Its high efficiency and low standby power make it suitable for energy-efficient lighting. The integrated protections ensure long-term reliability in lighting applications.
Recommended
IoT and Smart Home Devices
For IoT devices and smart home hubs, the TNY277GN-TL offers a compact and efficient power solution. Its low standby power is ideal for always-on devices, and the integrated MOSFET reduces board space. The device's robust protection features ensure reliable operation in various environments.
Recommended
Engineering reference data for TNY277GN-TL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TNY277GN | TNY276GN | TNY278GN | NCP1077 | UCC28911 |
|---|---|---|---|---|---|---|
| Package | SMD-8C | SMD-8C | SMD-8C | SMD-8C | SOT-223 | SOIC-7 |
| Brand | Power Integrations | Power Integrations | Power Integrations | Power Integrations | onsemi | Texas Instruments |
| Switching Frequency | 132 kHz | 132 kHz | 132 kHz | 132 kHz | 65/100 kHz | 110 kHz |
| MOSFET Breakdown Voltage | 700 V | 700 V | 700 V | 700 V | 700 V | 700 V |
| Control Scheme | ON/OFF | ON/OFF | ON/OFF | ON/OFF | PWM | PWM |
| Pin Compatibility | Reference | Yes | Yes | Yes | No | No |
| Price (1pc) | $1.25 | $1.25 | $1.10 | $1.40 | $0.80 | $1.00 |
Key Differentiators
- Integrated 700V MOSFET (vs NCP1077)
- ON/OFF control scheme (vs UCC28911)
- Frequency jitter for EMI reduction (vs NCP1077)
Design Notes
For optimal thermal performance, ensure the SMD-8C package has adequate copper area on the PCB, especially on the source pins which are connected to the thermal pad. Use multiple vias to connect to a ground plane to dissipate heat effectively. Follow the recommended layout in the TinySwitch-III datasheet to minimize EMI and ensure stable operation.
Do not omit the BP/M pin capacitor; it is essential for internal supply decoupling and proper operation. Also, ensure the EN/UV pin is correctly connected: if line undervoltage detection is not needed, leave it unconnected to disable the function. Incorrect connection can cause false triggering or failure to start.
The TNY277GN-TL can dissipate significant power at high output loads. Ensure adequate heatsinking through PCB copper and consider the ambient temperature. The thermal shutdown protection will activate if the junction temperature exceeds the limit, so proper thermal design is essential for reliable operation.
Compliance Information
RoHS compliant per Power Integrations product page. Not AEC-Q100 qualified as it is not an automotive-grade part.
