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D2TO035CR0100FKE3 Datasheet(PDF) 3 Page - Vishay Siliconix |
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D2TO035CR0100FKE3 Datasheet(HTML) 3 Page - Vishay Siliconix |
3 / 6 page D2TO35 www.vishay.com Vishay Sfernice Revision: 22-Apr-13 3 Document Number: 51058 For technical questions, contact: sfer@vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 CHOICE OF THE BOARD The user must choose the board according to the working conditions of the component (power, room temperature). Maximum working temperature must not exeed 175 °C. The dissipated power is simply calculated by the following ratio: P: Expressed in W T: Difference between maximum working temperature and room temperature or fluid cooling temperature RTH (j - c): Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal resistance of the component: 4.28 °C/W. RTH (c - h): Thermal resistance value measure 4.28 °C/W. Outer side of the resistor and upper side of the board. This is the thermal resistance of the solder layer. RTH (h - a): Thermal resistance of the board. Example: RTH (c - h) + RTH (h - a) for D2TO35 power rating 3.5 W at ambient temperature + 25 °C. Thermal resistance RTH (j - c): 4.28 °C/W Considering equation (1) we have: T = 175 °C - 25 °C = 150 °C RTH (j - c) + RTH (c - h) + RTH (h - a) = T/P = 150/3.5 = 42.8 °C/W RTH (c - h) + RTH (h - a) = 42.8 °C/W - 4.28 °C/W = 38.52 °C/W Single Pulse: These informations are for a single pulse on a cold resistor at 25 °C (not already used for a dissipation) and for pulses of 100 ms maximum duration. The formula used to calculate E is: with: E (J): Pulse energy P (W): Pulse power t (s): Pulse duration U (V): Pulse voltage R (W): Resistor The energy calculated must be less: than that allowed by the graph. Repetitive or Superimposed Pulses: The following formula is used to calculate the “equivalent” energy of a repetitive pulse or the “equivalent energy” of a pulse on a resistor that is already dissipating power. with: Ec (J): Equivalent pulse energy E (J): Known pulse energy Pr: Resistor power rating Pa: Mean power being dissipated The energy calculated must be less than that allowed by the graph and the average power dissipated (Pa) must not exceed the continuous power of resistor. P T R TH (j - c) R TH (c - h) R TH (h - a) ++ --------------------------------------------------------------------------------------------------- 1 = E P x t U 2 R -------- x t == E c E x 1 P a P r ------ + = |
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