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參數(shù)資料
| 型號： | VPS13 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | CRT Display Video Output Amplifier, High-Voltage/Wideband Amplifier |
| 中文描述： | CRT顯示器視頻輸出放大器，放大器High-Voltage/Wideband |
| 文件頁數(shù)： | 3/4頁 |
| 文件大小： | 88K |
| 代理商： | VPS13 |
Thermal Design
Since 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) =
θ
j-c (Tri)
×
Pc (Tri) +
Tc + Ta (°C).......................(1)
θ
j-c (Tri) : Thermal resistance of an individual transistor
Pc(Tri)
: Collector loss for an individual transistor
Tc
: Case temperature rise
Ta
: Ambient temperature
The
θ
j-c (Tri) for each chip is:
θ
j-c (Tr1) = 35°C/W
θ
j-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 the
maximum operating frequency, f = 130 MHz (clock), then the chip with the largest loss will be transistor 3 (Tr3) of the
emitter-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 capacity
θ
h such that the Tj of these transistors does not exceed 150°C. Equation
(4) below gives the relationship between
θ
h and
Tc.
Tc = Pd (Total)
× θ
h..................................................................(4)
The required
θ
h is calculated using this equation and equation (1).
No. 5548-3/4
VPS13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VPS15-1LX | 制造商:Leviton Manufacturing Co 功能描述: |
| VPS16-11000 | 功能描述:電源變壓器 175VA 16VCT at 11A 8V at 22A CHSMT RoHS:否 制造商:Triad Magnetics 功率額定值:12 VA 初級電壓額定值:115 V / 230 V 次級電壓額定值:12 V / 24 V 安裝風(fēng)格:SMD/SMT 一次繞組:Dual Primary Winding 二次繞組:Dual Secondary Winding 長度:2.5 in 寬度:2 in 高度:1.062 in |
| VPS16-1600 | 功能描述:電源變壓器 25VA 16VCT at 1.6A 8V at 3.2A CHSMT RoHS:否 制造商:Triad Magnetics 功率額定值:12 VA 初級電壓額定值:115 V / 230 V 次級電壓額定值:12 V / 24 V 安裝風(fēng)格:SMD/SMT 一次繞組:Dual Primary Winding 二次繞組:Dual Secondary Winding 長度:2.5 in 寬度:2 in 高度:1.062 in |
| VPS16-2700 | 功能描述:電源變壓器 43VA 16VCT at 2.7A 8V at 5.4A CHSMT RoHS:否 制造商:Triad Magnetics 功率額定值:12 VA 初級電壓額定值:115 V / 230 V 次級電壓額定值:12 V / 24 V 安裝風(fēng)格:SMD/SMT 一次繞組:Dual Primary Winding 二次繞組:Dual Secondary Winding 長度:2.5 in 寬度:2 in 高度:1.062 in |
| VPS16-5000 | 功能描述:電源變壓器 80VA 16VCT at 5A 8V at 10A CHSMT RoHS:否 制造商:Triad Magnetics 功率額定值:12 VA 初級電壓額定值:115 V / 230 V 次級電壓額定值:12 V / 24 V 安裝風(fēng)格:SMD/SMT 一次繞組:Dual Primary Winding 二次繞組:Dual Secondary Winding 長度:2.5 in 寬度:2 in 高度:1.062 in |
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