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參數(shù)資料
| 型號： | VP453 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | CRT Display Video Output Amplifier for High-Voltage,Wideband Application(應(yīng)用于高電壓，寬帶的用于CRT顯示視頻輸出放大器) |
| 中文描述： | CRT顯示器視頻放大器的高輸出電壓，寬帶應(yīng)用（應(yīng)用于高電壓，寬帶的用于陰極射線管顯示視頻輸出放大器） |
| 文件頁數(shù)： | 4/5頁 |
| 文件大?。?/td> | 90K |
| 代理商： | VP453 |
No. 5477-4/5
VP453
Sample Thermal Design for the VP453
Conditions: For an fH = 95 kHz class monitor, fV = 120 MHz (clock).
VCC = 80 V, VOUT = 40 Vp-p (CL = 10 pF)
Here we consider the case where such a monitor is to be operated at ambient temperatures up to Ta = 60°C and at a
maximum frequency of f = 100 MHz (clock).
As mentioned previously, the chips with the maximum loss will be transistors 3 and 4 in the emitter-follower stage.
Equation (5) follows from deriving that value from the figure below and equation (3).
PC (Tr3, 4)f = 120 MHz = 6.9 × 0.25 ≈ 1.72 [W] ......................................................(5)
However, the actual usage conditions include a blanking period. If we calculate the power during this period
approximately at a 1-MHz power ratio, from Pd – f(clock) and PC (Tri)Ratio – f (clock) figures, we see that PC (BLK) for
transistors 3 and 4 will be:
PC BLK (Tr3, 4) = 2.6 × 0.08 = 0.21 [W].............................................................. (6)
If the blanking period is 20% of the total, from the data of equation (5) and formula (6) we see that the loss in transistors
3 and 4 will be:
PC (Tr3, 4) = PC (Tr3, 4) f = 120 MHz × 0.8 + PCBLK (Tr3, 4) × 0.2 ≈ 1.42 [W] ...(7)
Next, applying the value of
θj–c to equation (7), shows Tj to be:
Tj = 1.42 × 35 ≈ 50 [°C]
Since
Tj ≤ 50°C, it suffices to only consider the Tc ≤ 100°C condition in the thermal design. That is, in the thermal
design we design
θh so that Tc will be under 100°C when Pd (total) = Pd (1ch) × 3 for the time when all three channels
are operating at their maximum levels.
Tc will be: Tc = 100 – 60 = 40°C
θh = Tc ÷ Pd (total) = 40 ÷ {(6.9 × 0.8 + 3.5 × 0.2) × 3} = 2.1
Thus:
θh = 2.1°C/W
In actual use, due to the actual ambient temperature, the operating conditions, and other factors, it will be possible to use
a heat sink smaller than the one required by the above design. Users should design an optimal heat sink using the data
presented above and their actual conditions.
VCC (V)
VOUT (V)
VO (center)
80
40
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| VP503 | CRT Display Video Output Amplifier: High-Voltage, Wideband Amplification |
| VP513 | CRT Display Video Output Amplifier: High-Voltage, Wideband Amplification |
| VP553 | CRT Display Video Output Amplifier for High-Voltage,Wideband Application(應(yīng)用于高電壓，寬帶的CRT顯示視頻輸出放大器) |
| VP603 | CRT Display Video Output Amplifier for High-Voltage,Wideband Application(應(yīng)用于高電壓，寬帶的CRT顯示視頻輸出放大器) |
| VPA1-A3C-FREQ | CRYSTAL OSCILLATOR, CLOCK, 1.544 MHz - 125 MHz, HCMOS/TTL OUTPUT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VP454CAB47 | 制造商:SRC Devices 功能描述: |
| VP45AC1B26 | 制造商:SRC Devices 功能描述: |
| VP4BK | 功能描述:電纜組件 VIDEO PATCH CORD BLK RoHS:否 制造商:Molex 產(chǎn)品:Power Assemblies 類型:Cable Assembly 連接器端口 A:No Connector 連接器端口 A 管腳計數(shù):4 連接器端口 B:No Connector 連接器端口 B 管腳計數(shù): 型式:Male 線規(guī) - 美國線規(guī)（AWG）:20, 28 長度:0.305 m 顏色:Black, Red |
| VP4BKX | 功能描述:PATCHCORD VIDEO STD 4' BLACK RoHS:是 類別:電纜組件 >> 視頻 - DVI，HDMI，WECo 系列:VP 標準包裝:1 系列:- 連接器類型:Mini-WECo 公形至 WECo 公形 長度:8.0'（2.44m） 纜線類型:圓形 顏色:黑 屏蔽:無屏蔽 使用:- |
| VP4BL | 功能描述:電纜組件 VIDEO PATCH CORD BLU RoHS:否 制造商:Molex 產(chǎn)品:Power Assemblies 類型:Cable Assembly 連接器端口 A:No Connector 連接器端口 A 管腳計數(shù):4 連接器端口 B:No Connector 連接器端口 B 管腳計數(shù): 型式:Male 線規(guī) - 美國線規(guī)（AWG）:20, 28 長度:0.305 m 顏色:Black, Red |
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