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參數(shù)資料
| 型號： | OPA548T |
| 元件分類： | DC/DC變換器 |
| 英文描述： | RxxP2xx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 3.3V; Power: 2W; EN 60950 certified, rated for 250VAC; UL-60950-1 / CSA C22.2 certified; 5.2kVDC Isolation for 1 Minute; Optional Continuous Short Circuit Protected; Wide Operating Temperature Range atfull 2 Watts Load, ?40??C to +85??C; Twin Chamber Transformer System; UL94V-0 Package Material; Efficiency to 80% |
| 中文描述： | 高電壓，大電流運(yùn)算放大器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 284K |
| 代理商： | OPA548T |
10
OPA548
THERMAL RESISTANCE vs
CIRCUIT BOARD COPPER AREA
50
40
30
20
10
0
T
θ
J
0
1
2
3
4
5
Copper Area (inches
2
)
OPA548F
Surface Mount Package
1oz copper
Circuit Board Copper Area
OPA548
Surface Mount Package
FIGURE 5. TO-220 Thermal Resistance vs Aluminum Plate Area.
FIGURE 6. DDPAK Thermal Resistance vs Circuit Board Copper Area.
conducting output transistor. Power dissipation can be mini-
mized by using the lowest possible power supply voltage
necessary to assure the required output voltage swing.
For resistive loads, the maximum power dissipation occurs
at a dc output voltage of one-half the power supply voltage.
Dissipation with ac signals is lower. Application Bulletin
AB-039 explains how to calculate or measure power dissi-
pation with unusual signals and loads.
THERMAL PROTECTION
Power dissipated in the OPA548 will cause the junction
temperature to rise. The OPA548 has thermal shutdown
circuitry that protects the amplifier from damage. The ther-
mal protection circuitry disables the output when the junc-
tion temperature reaches approximately 160
°
C, allowing the
device to cool. When the junction temperature cools to
approximately 140
°
C, the output circuitry is again enabled.
Depending on load and signal conditions, the thermal pro-
tection circuit may cycle on and off. This limits the dissipa-
tion of the amplifier but may have an undesirable effect on
the load.
Any tendency to activate the thermal protection circuit
indicates excessive power dissipation or an inadequate heat
sink. For reliable operation, junction temperature should be
limited to 125
°
C, maximum. To estimate the margin of
safety in a complete design (including heat sink) increase the
ambient temperature until the thermal protection is trig-
gered. Use worst-case load and signal conditions. For good
reliability, thermal protection should trigger more than 35
°
C
above the maximum expected ambient condition of your
application. This produces a junction temperature of 125
°
C
at the maximum expected ambient condition.
The internal protection circuitry of the OPA548 was de-
signed to protect against overload conditions. It was not
intended to replace proper heat sinking. Continuously run-
ning the OPA548 into thermal shutdown will degrade reli-
ability.
0
1
2
3
4
5
6
7
8
18
16
14
12
10
8
T
J
Aluminum Plate Area (inches
2
)
THERMAL RESISTANCE
vs ALUMINUM PLATE AREA
Aluminum Plate Area
Flat, Rectangular
Aluminum Plate
OPA548
TO-220 Package
θ
0.030in Al
0.062in Al
0.050in Al
Vertically Mounted
in Free Air
Optional mica or film insulator
for electrical isolation. Adds
approximately 1°C/W.
Aluminum
Plate Thickness
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA549T | RxxPxx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 15V; Output Voltage (Vdc): 05V; Power: 1W; EN 60950 certified, rated for 250VAC; UL-60950-1 / CSA C22.2 certified; 5.2kVDC Isolation for 1 Minute; Optional Continuous Short Circuit Protected; 2 Chamber Transformer System; UL94V-0 Package Material; Efficiency to 80% |
| OPA551UA | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
| OPA552 | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
| OPA552FA | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
| OPA552PA | High-Voltage, High-Current OPERATIONAL AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA548T | 制造商:Texas Instruments 功能描述:OP AMP HIGH VOLT 3A TO-220-7 548 |
| OPA548T | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| OPA548T-1 | 功能描述:運(yùn)算放大器 - 運(yùn)放 High V & A RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA548T-1 | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| OPA548T-1G3 | 功能描述:運(yùn)算放大器 - 運(yùn)放 Hi-Vltg Hi-Current Exc Output Swing RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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