The TNY278PN is a TinySwitch-III energy-efficient, off-line Switcher with enhanced flexibility and extended power range, incorporates a 700V 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.
Simple ON/OFF Control, No Loop Compensation Needed
Selectable Current Limit Through BP/M Capacitor Value
Higher Current Limit Extends Peak Power or, in Open Frame Applications, Maximum Continuous Power
Lower-current Limit Improves Efficiency In Enclosed Adapters/Chargers
Allows Optimum TinySwitch-III Choice by Swapping Devices with No Other Circuit Redesign
Tight I²f Parameter Tolerance Reduces System Cost
Maximizes MOSFET and Magnetic Power Delivery
Minimizes Max Overload Power, Reducing Cost of Transformer, Primary Clamp and Secondary Components
ON-time Extension, Extends Low Line Regulation Range/Hold-up Time to Reduce Input Bulk Capacitance
Self-biased - No Bias Winding or Bias Components
Frequency Jittering Reduces EMI Filter Costs
Pin-out Simplifies Heatsinking to PCB
SOURCE Pins are Electrically Quiet for Low EMI
Enhanced Safety and Reliability
Accurate hysteretic thermal shutdown protection with automatic recovery
Improved Auto-restart Delivers <3% of 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
Maximum ratings specified may be applied, one at a time, without causing permanent damage to the product.
