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TNY274G Datasheet(PDF) 10 Page - Power Integrations, Inc. |
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TNY274G Datasheet(HTML) 10 Page - Power Integrations, Inc. |
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10 / 24 page  10 E2/06 TNY274-280 For best performance of the OVP function, it is recommended thatarelativelyhighbiaswindingvoltageisused,intherangeof 15V-30V. This minimizes the error voltage on the bias winding due to leakage inductance and also ensures adequate voltage during no-load operation from which to supply the BP/M pin for reduced no-load consumption. Selecting the Zener diode voltage to be approximately 6 V above the bias winding voltage (28 V for 22 V bias winding) gives good OVP performance for most designs, but can be adjusted to compensate for variations in leakage inductance. Adding additional filtering can be achieved by inserting a low value (10 Ω to 47 Ω) resistor in series with the bias winding diode and/or the OVP Zener as shown by R7 and R3 in Figure 14. The resistor in series with the OVPZener also limits the maximum current into the BP/M pin. Reducing No-load Consumption As TinySwitch-III is self-powered from the BP/M pin capacitor, there is no need for an auxillary or bias winding to be provided onthetransformerforthispurpose. Typicalno-loadconsumption whenself-poweredis<150mWat265VACinput. Theaddition of a bias winding can reduce this down to <50 mWby supplying theTinySwitch-IIIfromthelowerbiasvoltageandinhibitingthe internal high voltage current source. To achieve this, select the value of the resistor (R8 in Figure 14) to provide the data sheet DRAIN supply current. In practice, due to the reduction of the bias voltage at low load, start with a value equal to 40% greater thanthedatasheetmaximumcurrent,andthenincreasethevalue of the resistor to give the lowest no-load consumption. Audible Noise The cycle skipping mode of operation used in TinySwitch-III can generate audio frequency components in the transformer. To limit this audible noise generation the transformer should be designed such that the peak core flux density is below 3000 Gauss (300 mT). Following this guideline and using the standard transformer production technique of dip varnishing practically eliminates audible noise. Vacuum impregnation of the transformer should not be used due to the high primary capacitanceandincreasedlossesthatresult.Higherfluxdensities are possible, however careful evaluation of the audible noise performance should be made using production transformer samples before approving the design. Ceramic capacitors that use dielectrics such as Z5U, when used in clamp circuits, may also generate audio noise. If this is the case, try replacing them with a capacitor having a different dielectric or construction, for example a film type. TinySwitch-lll Layout Considerations Layout See Figure 15 for a recommended circuit board layout for TinySwitch-III . Single Point Grounding Useasinglepointgroundconnectionfromtheinputfiltercapacitor to the area of copper connected to the SOURCE pins. Bypass Capacitor (C BP) The BP/M pin capacitor should be located as near as possible to the BP/M and SOURCE pins. Primary Loop Area The area of the primary loop that connects the input filter capacitor, transformer primary and TinySwitch-III together should be kept as small as possible. Primary Clamp Circuit Aclamp is used to limit peak voltage on the DRAIN pin at turn off. This can be achieved by using an RCD clamp or a Zener (~200 V) and diode clamp across the primary winding. In all cases, to minimize EMI, care should be taken to minimize the circuit path from the clamp components to the transformer and TinySwitch-III. OUTPUT POWER TABLE PRODUCT 230 VAC ±15% 85-265 VAC I LIMIT-1 I LIMIT I LIMIT+1 I LIMIT-1 I LIMIT I LIMIT+1 TNY274 P or G 9 10.9 9.1 7.1 8.5 7.1 TNY275 P or G 10.8 12 15.1 8.4 9.3 11.8 TNY276 P or G 11.8 15.3 19.4 9.2 11.9 15.1 TNY277 P or G 15.1 19.6 23.7 11.8 15.3 18.5 TNY278 P or G 19.4 24 28 15.1 18.6 21.8 TNY279 P or G 23.7 28.4 32.2 18.5 22 25.2 TNY280 P or G 28 32.7 36.6 21.8 25.4 28.5 Table 2. Minimum Practical Power at Three Selectable Current Limit Levels. |
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