Power Supply Control Chip with Peak Power Handler - TinySwitch-PK - Power Integrations

Power Integrations introduced the TinySwitch-PK power supply control IC with peak power mode. The new Power Supply Control chip is able to deliver up to 280% peak power for short periods of time. This feature enables designers to specify transformers rated for the continuous power level.

TinySwitch-PK Power Supply Control Typical Application

Many consumer electronic products have seldom-used lights, buzzers or motors that require extra power for short periods of time. DVD player drawer-opening motors are good examples. The rest of the time, the hardware performs standard tasks and consumes much less power, yet all the system components - such as transformers, output diodes and bulk storage capacitors - must be specified for use at the occasional higher power requirement. The challenge in these systems is to design a power supply that can provide the necessary peaks when needed, but does not burden the application with peak costs. By automatically entering into a special peak mode - doubling operating frequency and boosting current limit for the duration of the peak power requirement - TinySwitch-PK  Power Supply Control IC  coaxes up to 280 percent of the design power level out of the same transformer and integrated MOSFET.

Features and benefits of TinySwitch-PK  Power Supply Control IC includes:

• Lowest System Cost with Enhanced Flexibility
  • Simple ON/OFF control, no loop compensation needed
  • Unique Peak Mode feature extends power range without increasing transformer size
  • Maximum frequency and current limit boosted at peak loads
  • Selectable current limit through BP/M capacitor value
  • Higher current limit further extends maximum power in open frame applications
  • Lower current limit improves efficiency in enclosed adapter applications
  • Allows optimum TinySwitch-PK choice by swapping devices with no other circuit redesign
  • Tight I2f parameter tolerance reduces system cost:
  • Maximizes MOSFET and magnetics power delivery
  • ON time extension – typically extends low line regulation range/hold-up time to reduce input bulk capacitance
  • Self-biased: no bias winding required for TNY375-376; winding required for TNY377-380
  • Frequency jittering reduces EMI filter costs
  • Optimized pin out eases pcb/external heatsinking
  • Quiet source-connected heatsink pins for low EMI
• Enhanced Safety and Reliability Features
  • Accurate hysteretic thermal shutdown with automatic recovery provides complete system level overload protection and eliminates need for manual reset
  • Auto-restart delivers <3% maximum power in short circuit and open loop fault conditions
  • Output overvoltage shutdown with optional Zener
  • Line undervoltage detect threshold set using a single optional resistor
  • Very low component count enhances reliability and enables single sided printed circuit board layout
  • High bandwidth provides fast turn on with no overshoot and excellent transient load response
  • Extended creepage between DRAIN and all other pins improves field reliability
• EcoSmart®– Extremely Energy Efficient
  • Easily meets all global energy efficiency regulations
  • No-load <170 mW at 265 VAC without bias winding, <60 mW with bias winding
  • ON/OFF control provides constant efficiency down to very light loads – ideal for mandatory CEC efficiency regulations and 1 W PC standby requirements

TinySwitch-PK  Power Supply Control IC features a 700V MOSFET alongside low-voltage control circuitry on a monolithic IC. Other features include integrated auto-restart, input under-voltage and output over-voltage protection, hysteretic thermal shutdown, and frequency jittering to minimize EMI. TinySwitch-PK Power Supply Control chip also includes selectable current limits, allowing the designer to choose any of three current limit values for each family member without any additional IC pins or external components.

TinySwitch-PK Power Supply Control chip is available in DIP-8 package.

Price of  TinySwitch-PK Power Supply Control chip (in this case TNY375P) in a DIP-8 package is $0.65 each for 1K lot qty.

Source: Power Integrations Power Supply Control IC