Keszoox
TNY285DG Offline Switcher IC SOP-7 – Pack of 2 (TinySwitch-III, Power Management)
TNY285DG Offline Switcher IC SOP-7 – Pack of 2 (TinySwitch-III, Power Management)
Couldn't load pickup availability
TNY285DG Offline Switcher IC – SOP-7, Pack of 2 (TinySwitch-III)
The TNY285DG is a member of Power Integrations' TinySwitch-III family – a highly integrated offline switcher IC that combines a high-voltage power MOSFET, PWM controller, oscillator, and comprehensive protection functions into a single SOP-7 package. Designed for low-power offline flyback power supplies (up to 5W), it dramatically reduces component count compared to discrete SMPS designs. The TNY285DG is widely used in USB chargers, phone adapters, and low-power consumer electronics power supplies – making it one of the most commonly replaced ICs in charger repair. This 2-piece SOP-7 pack is ideal for repair technicians.
Electrical Specifications
- Part Number: TNY285DG (SOP-7) / TNY285PN (DIP-8)
- Package: SOP-7 (SMD, 1.27mm pitch, 7-pin)
- Family: TinySwitch-III (Power Integrations)
- Output Power: Up to 5W (85–265VAC input, open-frame design)
- Integrated MOSFET: 700V N-channel MOSFET (no external MOSFET needed)
- Switching Frequency: 132kHz (typical)
- Input Voltage: 85VAC – 265VAC (universal mains)
- Enable/Undervoltage: EN/UV pin for feedback and auto-restart
- Protection: Cycle-by-cycle current limiting, auto-restart (OCP/OVP), thermal shutdown
- Standby Power: <30mW (no-load, 230VAC)
- Operating Temperature: −40°C to +150°C (junction)
TinySwitch-III – How It Simplifies SMPS Design
Traditional offline SMPS requires a separate PWM controller IC, power MOSFET, gate driver, startup resistors, and current sense circuit. The TNY285DG integrates all of these into one SOP-7 IC – the only external components needed are the transformer, output diode, filter capacitors, and optocoupler feedback circuit. This reduces BOM count by 50% and PCB area significantly.
Typical Failure Symptoms (When TNY285DG Fails)
- USB charger or adapter completely dead – no output voltage
- Charger makes ticking sound (auto-restart cycling)
- Output voltage present but drops under load
- Charger works intermittently or gets very hot
Typical Applications
- USB charger repair: Most common application – replacement for failed TNY285 in phone chargers
- AC-DC adapter repair: Low-power adapter SMPS controller replacement
- Consumer electronics power supply: Set-top box, router, and IoT device power supply
- LED driver power supply: Offline flyback converter for LED lighting
- Industrial low-power SMPS: Auxiliary power supply design
Package Contents
- 2 × TNY285DG SOP-7 TinySwitch-III offline switcher ICs
An entire offline SMPS controller in one SOP-7 IC – the TNY285DG is the most common IC in USB charger and low-power adapter repair, integrating the MOSFET, PWM controller, and protection in a single package.
