TNY178PN is a TinySwitch-LT offline switcher IC that integrates a high-voltage power MOSFET and power supply controller into a single DIP package for compact AC-DC conversion designs.
Function: Energy Efficient, Offline Switcher with Enhanced Flexibility and Extended Power Range
Package: DIP-8C Type
Manufacturer: Power Integrations ( http://www.powerint.com )
Image
Description
TNY178PN features simple ON/OFF control without the need for loop compensation, a 650V rated MOSFET, selectable current limit via the BP/M pin, and built-in protection functions including auto-restart and thermal shutdown. This device is widely used in low-power switch-mode power supplies for appliances, standby converters, and auxiliary power applications.
TinySwitch-LTcombines a high voltage power MOSFET switch with a power supply controller in one device. Unlike conventional PWM (pulse width modulator) controllers, it uses a simple ON/OFF control to regulate the output voltage. The controller consists of an oscillator, enable circuit (sense and logic), current limit state machine, 5.85 V regulator, BYPASS/MULTI-FUNCTION pin undervoltage, overvoltage circuit, and current limit selection circuitry, over- temperature protection, current limit circuit, leading edge blanking, and a 700 V power MOSFET. TinySwitch-LTincorporates additional circuitry for auto-restart, adaptive switching cycle on-time extension, and frequency jitter. Figure 2 shows the functional block diagram with the most important features.
Output Power Table
Features
1. High DC current gain due to Darlington connection
2. High surge resistance due to on-chip protection elements:
(1) C to E: Dumper diode
(2) C to B: Zener diode
3. Low collector saturation voltage
4. Integrated 650V power MOSFET
5. Frequency jittering for reduced EM
6. Built-in 5.85V regulator for internal biasing
7. Simple ON/OFF control architecture without external loop compensation
Pinout
Applications
1. Appliance power supplies
2. Home automation auxiliary converters
3. PC standby power supplies
4. Low-power AC-DC adapters and chargers
TNY178PN Datasheet PDF
