TinySwitch-III incorporates a 700 V power MOSFET, oscillator, high voltage switched current source, current limit (user selectable), and thermal shutdown circuitry. The IC family uses an ON/OFF control scheme and offers a design flexible solution with a low system cost and extended power capability

Catalog

ⅠTNY276PN Overview

TinySwitch-III combines 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-III incorporates additional circuitry for line undervoltage sense, auto-restart, adaptive switching cycle on time extension, and frequency jitter

ⅡTNY276PN Pinout

Figure1:TNY276PN pinout

BYPASS/MULTI-FUNCTION (BP/M) Pin:

1. It is the connection point for an external bypass capacitor for the internally generated 5.85 V supply.
2. It is a mode selector for the current limit value, depending on the value of the capacitance added. Use of a 0.1 μF capacitor results in the standard current limit value. Use of a 1 μF capacitor results in the current limit being reduced to that of the next smaller device size. The use of a 10 μF capacitor results in the current limit is increased to that of the next larger device size for TNY275-280.
3. It provides a shutdown function. When the current into the bypass pin exceeds ISD, the device latches off until the BP/M voltage drops below 4.9 V, during power down. This can be used to provide an output overvoltage function with a Zener connected from the BP/M pin to a bias winding supply.

ENABLE/UNDERVOLTAGE (EN/UV) Pin:

This pin has dual functions: enable input and line undervoltage sense. During normal operation, switching of the power MOSFET is controlled by this pin. MOSFET switching is terminated when a current greater than a threshold current is drawn from this pin. Switching resumes when the current being pulled from the pin drops to less than a threshold current. Modulation of the threshold current reduces group pulsing. The threshold current is between 75 μA and 115 μA. The EN/UV pin also senses line undervoltage conditions through an external resistor connected to the DC line voltage. If there is no external resistor connected to this pin, TinySwitch-III detects its absence and disables the line undervoltage function.

SOURCE (S) Pin: This pin is internally connected to the output MOSFET source for high voltage power return and control circuit common.

Ⅲ TNY276PN CAD Model

TNY276PN symbol

TNY276PN footprint

TNY276PN 3D Model

TNY276PN 3D Model

Ⅳ TNY276PN Features

• Simple ON/OFF control, no loop compensation needed
  • Selectable current limit through BP/M capacitor value
  • Higher current limit extends peak power or, in o pen frame applications, maximum continuous power
  • Lower current limit improves efficiency in enclosed adapters/chargers
  • Allows optimum TinySwitch-II I choice by swapping devices with no other circuit redesign
  • Tight I2f para meter tolerance reduces the system.

Ⅴ TNY276PN Applications

Chargers/adapters for cell/cordless phones, PDAs, digital cameras, MP3/portable audio, shavers, etc.

PC Standby and other auxiliary supplies DVD/PVR and other low power set-top decoders

Supplies for appliances, industrial systems, metering, etc.

Ⅵ TNY276PN Product Attributes

Ⅶ TNY276PN PDF

TNY276PN Datasheet

Ⅷ Product Manufacturer

Power Integral/Aons is a leading supplier of high-performance electronic components used in high-voltage power-conversion systems. our integrated circuits and diodes enable compact, energy-efficient AC-DC power supplies for a vast range of electronic products including mobile devices, TVs, PCs, power tools, smart appliances (IoT), smart uN/Ality meters, and LED lights.