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TNY255 Dataheets PDF



Part Number TNY255
Manufacturers Power Integrations Inc.
Logo Power Integrations  Inc.
Description Low Power Off-line Switcher
Datasheet TNY255 DatasheetTNY255 Datasheet (PDF)

TNY253/254/255 TinySwitch™ Family Energy Efficient, Low Power Off-line Switchers Product Highlights Lowest Cost, Low Power Switcher Solution • Lower cost than RCC, discrete PWM and other integrat- ed/hybrid solutions • Cost effective replacement for bulky linear adapters • Lowest component count • Simple ON/OFF control – no loop compensation devices • No bias winding – simpler, lower cost transformer • Allows simple RC type EMI filter for up to 2 W from universal input or 4 W from 115 VAC input.

  TNY255   TNY255


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TNY253/254/255 TinySwitch™ Family Energy Efficient, Low Power Off-line Switchers Product Highlights Lowest Cost, Low Power Switcher Solution • Lower cost than RCC, discrete PWM and other integrat- ed/hybrid solutions • Cost effective replacement for bulky linear adapters • Lowest component count • Simple ON/OFF control – no loop compensation devices • No bias winding – simpler, lower cost transformer • Allows simple RC type EMI filter for up to 2 W from universal input or 4 W from 115 VAC input Extremely Energy Efficient • Consumes only 30/60 mW at 115/230 VAC with no load • Meets Blue Angel, Energy Star, Energy 2000 and 200 mW European cell phone requirements for standby • Saves $1 to $4 per year in energy costs (at $0.12/kWHr) compared to bulky linear adapters • Ideal for cellular phone chargers, standby power supplies for PC, TV and VCR, utility meters, and cordless phones. High Performance at Low Cost • High-voltage powered – ideal for charger applications • Very high loop bandwidth provides excellent transient response and fast turn on with practically no overshoot • Current limit operation rejects line frequency ripple • Glitch free output when input is removed • Built-in current limit and thermal protection • 44 kHz operation (TNY253/4) with snubber clamp reduces EMI and video noise in TVs and VCRs • Operates with optocoupler or bias winding feedback Description The TinySwitch family uses a breakthrough design to provide the lowest cost, high efficiency, off-line switcher solution in the 0 to 10 W range. These devices integrate a 700 V power MOSFET, oscillator, high-voltage switched current source, current limit and thermal shutdown circuitry. They start-up and run on power derived from the DRAIN voltage, eliminating the need for a transformer bias winding and the associated circuitry. And yet, they consume only about 80 mW at no load, from 265 VAC input. A simple ON/OFF control scheme also eliminates the need for loop compensation. + Wide-Range High-Voltage DC Input – TinySwitch D EN BP S Figure 1. Typical Standby Application. + DC Output – PI-2178-022699 TinySwitch Selection Guide ORDER PART NUMBER TNY253P TNY253G TNY254P TNY254G TNY255P TNY255G PACKAGE DIP-8 SMD-8 DIP-8 SMD-8 DIP-8 SMD-8 Recommended Range for Lowest System Cost* 230 VAC or 115 VAC w/Doubler 85-265 VAC 0-4 W 0-2 W 2-5 W 1-4 W 4-10 W 3.5-6.5 W Table 1. *Please refer to the Key Application Considerations section for details. The TNY253 and TNY254 switch at 44 kHz to minimize EMI and to allow a simple snubber clamp to limit DRAIN spike voltage. At the same time, they allow use of low cost EE16 core transformers to deliver up to 5 W. The TNY253 is identical to TNY254 except for its lower current limit, which reduces output short-circuit current for applications under 2.5 W. TNY255 uses higher switching rate of 130 kHz to deliver up to 10 W from the same low cost EE16 core for applications such as PC standby supply. An EE13 or EF13 core with safety spaced bobbin can be used for applications under 2.5 W. Absence of a bias winding eliminates the need for taping/margins in most applications, when triple insulated wire is used for the secondary. This simplifies the transformer construction and reduces cost. February 2012 TNY253/254/255 BYPASS 50 μA OSCILLATOR CLOCK DCMAX REGULATOR 5.8 V 5.8 V 5.1 V UNDERVOLTAGE + - THERMAL SHUTDOWN + DRAIN VILIMIT S Q ENABLE 1.5 V + VTH R Q LEADING EDGE BLANKING SOURCE Figure 2. Functional Block Diagram. Pin Functional Description DRAIN (D) Pin: Power MOSFET drain connection. Provides internal operating current for both start-up and steady-state operation. BYPASS (BP) Pin: Connection point for an external bypass capacitor for the internally generated 5.8 V supply. Bypass pin is not intended for sourcing supply current to external circuitry. ENABLE (EN) Pin: The power MOSFET switching can be terminated by pulling this pin low. The I-V characteristic of this pin is equivalent to a voltage source of approximately 1.5 V with a source current clamp of 50 µA. SOURCE (S) Pin: Power MOSFET source connection. Primary return. TinySwitch Functional Description TinySwitch is intended for low power off-line applications. It combines a high-voltage power MOSFET switch with a power supply controller in one device. Unlike a conventional PWM (Pulse Width Modulator) controller, the TinySwitch uses a simple ON/OFF control to regulate the output voltage. The TinySwitch controller consists of an Oscillator, Enable (Sense and Logic) circuit, 5.8 V Regulator, Undervoltage circuit, PI-2197-061898 BYPASS 1 8 SOURCE SOURCE 2 7 SOURCE SOURCE 3 6 SOURCE ENABLE 4 5 DRAIN P Package (DIP-8) G Package (SMD-8) PI-2199-031501 Figure 3. Pin Configuration. Hysteretic Over Temperature Protection, Current Limit circuit, Leading Edge Blanking, and a 700 V power MOSFET. Figure 2 shows a functional block diagram with the most impor.


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