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## VPS13 Datasheet(PDF) 3 Page - Sanyo Semicon Device

 Part No. VPS13 Description CRT Display Video Output Amplifier, High-Voltage/Wideband Amplifier Download 4 Pages Scroll/Zoom 100% Manufacturer SANYO [Sanyo Semicon Device] Direct Link https://www.sanyo-av.com/us/ Logo

## VPS13 Datasheet(HTML) 3 Page - Sanyo Semicon Device

 3 / 4 pageThermal DesignSince the VPS13 includes three channels as shown in the circuit diagram on page 2, we first consider a single channel.The chip temperature of each transistor under actual operating conditions is determined using the following formula.Tj = (Tri) =θj-c (Tri) × Pc (Tri) + ∆Tc + Ta (°C).......................(1)θj-c (Tri) : Thermal resistance of an individual transistorPc(Tri): Collector loss for an individual transistor∆Tc: Case temperature riseTa: Ambient temperatureTheθj-c (Tri) for each chip is: θj-c (Tr1) = 35°C/Wθj-c (Tr2) to (Tr4) = 30°C/W.......................................................(2)Although the loss for each transistor in a video pack varies with frequency and is not uniform, if we assume themaximum operating frequency, f = 130 MHz (clock), then the chip with the largest loss will be transistor 3 (Tr3) of theemitter-follower stage. From the Pd-f (clock) figure we see that loss will be 22% of the total loss for a single channel:Pc (emitter-follower stage)(f = 130 MHz) = Pd (1ch) (f = 130 MHz) × 0.22 [W](3)Here, we must select a heat sink with a capacityθh such that the Tj of these transistors does not exceed 150°C. Equation(4) below gives the relationship betweenθh and ∆Tc.∆Tc = Pd (Total) ×θh..................................................................(4)The requiredθh is calculated using this equation and equation (1).No. 5548-3/4VPS13

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