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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)： | 12/16頁 |
| 文件大?。?/td> | 284K |
| 代理商： | OPA548T |
12
OPA548
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 8 provides an example of how to
implement this function using a single supply. Figure 9 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.
Output Disable and Thermal Shutdown Status
As mentioned earlier, the OPA548’s output can be disabled
and the disable status can be monitored simultaneously.
Figures 12 and 13 provide examples interfacing to the E/S
pin while using a single supply and dual supplies, respec-
tively.
OUTPUT STAGE COMPENSATION
The complex load impedances common in power op amp
applications can cause output stage instability. For normal
operation output compensation circuitry is typically not
required. However, if the OPA548 is intended to be
driven into current limit, an R/C network may be required.
Figure 14 shows an output series R/C compensation (snub-
ber) network which generally provides excellent stability.
A snubber circuit may also enhance stability when driving
large capacitive loads (>1000pF) or inductive loads (motors,
loads separated from the amplifier by long cables). Typi-
cally 3
to 10
in series with 0.01
μ
F to 0.1
μ
F is adequate.
Some variations in circuit value may be required with
certain loads.
OUTPUT PROTECTION
Reactive and EMF-generating loads can return load cur-
rent to the amplifier, causing the output voltage to exceed
the power supply voltage. This damaging condition can
FIGURE 11. Thermal Shutdown Status with Dual Supplies.
FIGURE 10. Thermal Shutdown Status with a Single Supply.
OPA548
V+
E/S
V–
1k
5V
22k
470
2N3906
Zetex
ZVN3310
OPA548
V+
E/S
V–
CMOS or TTL
OPA548
V+
E/S
HCT
OR
TTL
Zetex
ZVN3310
2.49k
5V
V–
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 10 gives an example of monitoring shutdown in a
single supply application. Figure 11 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 16.
FIGURE 9. Output Disable with Dual Supplies.
OPA548
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 8. Output Disable with a Single Supply.
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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