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STK4067 Fiches technique(PDF) 5 Page - Sanyo Semicon Device |
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STK4067 Fiches technique(HTML) 5 Page - Sanyo Semicon Device |
5 / 8 page STK4067 No. 4376-5/8 Sample STK4067 Heat Sink Design The radiator thermal resistance θc-a required for total substrate power dissipation Pd in the STK4067 is determined as: Condition 1: IC substrate temperature Tc not to exceed 110°C. Pd x θc-a+Ta <110°C ······························· (1) where Ta is set assured ambient temperature. Condition 2: Power transistor junction temperature Tj not to exceed 150°C. Pd x θc-a+Pd/N x θj-c+Ta<150°C·············(2) where N is the number of power transistors and θj-c is the thermal resistance per power transistor chip. However, power transistor power consumption is Pd equally divided by N units. Expressions (1) and (2) can be rewritten based on θc-a to yield: θc-a<(110–Ta)/Pd ······································(1)' θc-a<(150–Ta)/Pd–θj-c/N··························(2)' The required radiator thermal resistance will satisfy both of these expressions. From expressions (1)' and (2)', the required radiator thermal resistance can be determined once the following specifications are known: • Supply voltage VCC • Load resistance RL • Assured ambient temperature Ta The total substrate power consumption when STK4067 VCC is ±13.2 V and RL is 2 Ω, for a continuous sine wave signal, is a maximum of 19.3W (Fig. 2). The STK4067 has four power transistors, so the thermal resistance per transistor θj-c is 1.6°C / W. With an assured ambient temperature Ta of 50°C, the required radiator thermal resistance θc-a would be: From expression (1)' θc-a <(110–50)/19.3 <3.1 From expression (2)' θc-a <(150–50)/19.3–1.6/4 <4.78 To satisfy both, 3.1°C/W is the required radiator thermal resistance. Figure 1 illustrates Pd - PO when the VCC of STK4067 is 13.2V and RL is functioning at 1Ω. Pd max= 34.8W From expression (1)' θc-a <(110–50)/34.8 <1.72 From expression (2)' θc-a <(150-50)/34.8–1.6/4 <2.47 To satisfy both, 1.72°C/W is the required radiator thermal resistance. Similar to figure 3 when the STK4067’s VCC is 13.2 V and RL is 4Ω. Pd max= 12W From expression (1)' θc-a <(110–50)/12 <5 From expression (2)' θc-a <(150-50)/12–1.6/4 <7.93 To satisfy both, 5°C / W is the required radiator thermal resistance. This design example is based on a fixed voltage supply, and will require verification within your specific set environment. |
Numéro de pièce similaire - STK4067 |
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Description similaire - STK4067 |
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