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參數(shù)資料
| 型號： | OPA547F |
| 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): 15V; 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)： | 10/13頁 |
| 文件大?。?/td> | 175K |
| 代理商： | OPA547F |
10
OPA547
THERMAL PROTECTION
The OPA547 has thermal shutdown that protects the ampli-
fier from damage. Activation of the thermal shutdown cir-
cuit during normal operation is an indication of excessive
power dissipation or an inadequate heat sink. Depending on
load and signal conditions, the thermal protection circuit
may cycle on and off. This limits the dissipation of the
amplifier but may have an undesirable effect on the load.
The thermal protection activates at a junction temperature of
approximately 160
°
C. However, for reliable operation junc-
tion temperature should be limited to 150
°
C. To estimate the
margin of safety in a complete design (including heat sink),
increase the ambient temperature until the thermal protection
is activated. Use worst-case load and signal conditions. For
good reliability, the 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.
ENABLE/STATUS (E/S) PIN
The Enable/Status Pin provides two functions: forcing this
pin low disables the output stage, or, E/S can be monitored
to determine if the OPA547 is in thermal shutdown. One or
both of these functions can be utilized on the same device
using single or dual supplies. For normal operation (output
enabled), the E/S pin can be left open or pulled high (at least
+2.4V above the negative rail).
Output Disable
A unique feature of the OPA547 is its output disable capa-
bility. This function not only conserves power during idle
periods (quiescent current drops to approximately 4mA) but
also allows multiplexing in low frequency (f<10kHz), mul-
tichannel applications. Signals that are greater than 10kHz
may cause leakage current to increase in devices that are
shutdown. Figure 15 shows the two OPA547s in a switched
amplifier configuration. The on/off state of the two amplifi-
ers is controlled by the voltage on the E/S pin.
To disable the output, the E/S pin is pulled low, no greater
than 0.8V above the negative rail. Typically the output is
shutdown in 1
μ
s. Figure 5 provides an example of how to
implement this function using a single supply. Figure 6 gives
a circuit for dual supply applications. To return the output to
an enabled state, the E/S pin should be disconnected (open) or
pulled to at least (V–) + 2.4V. It should be noted that pulling
the E/S pin high (output enabled) does not disable internal
thermal shutdown.
OPA547
V+
E/S
V–
NOTE: (1) Optional—may be required to limit leakage
current of optocoupler at high temperatures.
(1)
6
1
1
4N38
Optocoupler
5
4
HCT or TTL In
5V
FIGURE 6. Output Disable with Dual Supplies.
Thermal Shutdown Status
Internal thermal shutdown circuitry shuts down the output
when the die temperature reaches approximately 160
°
C, reset-
ting when the die has cooled to 140
°
C. The E/S pin can be
monitored to determine if shutdown has occurred. During
normal operation the voltage on the E/S pin is typically 3.5V
above the negative rail. Once shutdown has occurred this
voltage drops to approximately 350mV above the negative rail.
Figure 7 gives an example of monitoring shutdown in a
single supply application. Figure 8 provides a circuit for dual
supplies. External logic circuitry or an LED could be used to
indicate if the output has been thermally shutdown, see
Figure 13.
FIGURE 7. Thermal Shutdown Status with a Single Supply.
FIGURE 8. Thermal Shutdown Status with Dual Supplies.
FIGURE 5. Output Disable with a Single Supply.
OPA547
V+
E/S
HCT
OR
TTL
Zetex
ZVN3310
2.49k
5V
V–
OPA547
V+
E/S
V–
1k
5V
22k
470
2N3906
Zetex
ZVN3310
OPA547
V+
E/S
V–
CMOS or TTL
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA547T | RxxP2xx Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 12V; Output Voltage (Vdc): 15V; 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% |
| OPA548F | 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% |
| OPA548T | 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% |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA547F/250 | 制造商:Texas Instruments 功能描述: |
| OPA547F/500 | 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 |
| OPA547F/500G3 | 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 |
| OPA547F500 | 制造商:BB 制造商全稱:BB 功能描述:High-Voltage, High-Current OPERATIONAL AMPLIFIER |
| OPA547FKTWT | 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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