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参数资料
| 型号： | VP453 |
| 厂商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | CRT Display Video Output Amplifier for High-Voltage,Wideband Application(应用于高电压，宽带的用于CRT显示视频输出放大器) |
| 中文描述： | CRT显示器视频放大器的高输出电压，宽带应用（应用于高电压，宽带的用于阴极射线管显示视频输出放大器） |
| 文件页数： | 4/5页 |
| 文件大小： | 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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| 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:电缆组件 VIDEO PATCH CORD BLK RoHS:否 制造商:Molex 产品:Power Assemblies 类型:Cable Assembly 连接器端口 A:No Connector 连接器端口 A 管脚计数:4 连接器端口 B:No Connector 连接器端口 B 管脚计数: 型式:Male 线规 - 美国线规（AWG）:20, 28 长度:0.305 m 颜色:Black, Red |
| VP4BKX | 功能描述:PATCHCORD VIDEO STD 4' BLACK RoHS:是 类别:电缆组件 >> 视频 - DVI，HDMI，WECo 系列:VP 标准包装:1 系列:- 连接器类型:Mini-WECo 公形至 WECo 公形 长度:8.0'（2.44m） 缆线类型:圆形 颜色:黑 屏蔽:无屏蔽 使用:- |
| VP4BL | 功能描述:电缆组件 VIDEO PATCH CORD BLU RoHS:否 制造商:Molex 产品:Power Assemblies 类型:Cable Assembly 连接器端口 A:No Connector 连接器端口 A 管脚计数:4 连接器端口 B:No Connector 连接器端口 B 管脚计数: 型式:Male 线规 - 美国线规（AWG）:20, 28 长度:0.305 m 颜色:Black, Red |
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