- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363778 > 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% PDF資料下載
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)： | 8/16頁 |
| 文件大?。?/td> | 284K |
| 代理商： | OPA548T |
8
OPA548
APPLICATIONS INFORMATION
Figure 1 shows the OPA548 connected as a basic non-
inverting amplifier. The OPA548 can be used in virtually
any op amp configuration.
Power supply terminals should be bypassed with low series
impedance capacitors. The technique shown, using a ce-
ramic and tantalum type in parallel is recommended. In
addition, we recommend a 0.01
μ
F capacitor between V+
and V– as close to the OPA548 as possible. Power supply
wiring should have low series impedance.
With the OPA548, the simplest method for adjusting the
current limit uses a resistor or potentiometer connected
between the I
LIM
pin and V– according to the equation:
The low level control signal (0 to 330
μ
A) also allows the
current limit to be digitally controlled.
Figure 3 shows a simplified schematic of the internal cir-
cuitry used to set the current limit. Leaving the I
LIM
pin open
programs the output current to zero, while connecting I
LIM
directly to V– programs the maximum output current limit,
typically 5A.
SAFE OPERATING AREA
Stress on the output transistors is determined both by the
output current and by the output voltage across the conduct-
ing output transistor, V
S
– V
O
. The power dissipated by the
output transistor is equal to the product of the output current
and the voltage across the conducting transistor, V
S
– V
O
.
The Safe Operating Area (SOA curve, Figure 2) shows the
permissible range of voltage and current.
FIGURE 1. Basic Circuit Connections.
POWER SUPPLIES
The OPA548 operates from single (+8V to +60V) or dual
(
±
4V to
±
30V) supplies with excellent performance. Most
behavior remains unchanged throughout the full operating
voltage range. Parameters which vary significantly with
operating voltage are shown in the typical performance
curves.
Some applications do not require equal positive and negative
output voltage swing. Power supply voltages do not need to
be equal. The OPA548 can operate with as little as 8V
between the supplies and with up to 60V between the
supplies. For example, the positive supply could be set to
55V with the negative supply at –5V, or vice-versa.
ADJUSTABLE CURRENT LIMIT
The OPA548 features an accurate, user-selected current
limit. Current limit is set from 0 to 5A by controlling the
input to the I
LIM
pin. Unlike other designs which use a power
resistor in series with the output current path, the OPA548
senses the load indirectly. This allows the current limit to be
set with a 0 to 330
μ
A control signal. In contrast, other
designs require a limiting resistor to handle the full output
current (5A in this case).
R
CL
=
15000
(
)
4.75
(
I
LIM
)
–13750
FIGURE 2. Safe Operating Area.
The safe output current decreases as V
S
– V
O
increases. Out-
put short-circuits are a very demanding case for SOA. A
short-circuit to ground forces the full power supply voltage
(V+ or V–) across the conducting transistor. Increasing the
case temperature reduces the safe output current that can be
tolerated without activating the thermal shutdown circuit of
the OPA548. For further insight on SOA, consult Applica-
tion Bulletin AB-039.
AMPLIFIER MOUNTING
Figure 4 provides recommended solder footprints for both the
TO-220 and DDPAK power packages. The tab of both pack-
ages is electrically connected to the negative supply, V–. It
may be desirable to isolate the tab of TO-220 package from its
G = 1+ R
2
R
1
Z
L
E/S
3
7
5
2
1
4
6
R
2
I
LIM(1)
R
1
0.1μF
(2)
10μF
OPA548
V–
V+
+
+
V
IN
10μF
0.1μF
(2)
0.01μF
(2)
V
O
NOTE: (1) I
connected to V– gives the maximum current
limit, 5A (peak). (2) Connect capacitors directly to package
power supply pins.
1
2
5
10
V
S
–
V
O
(V)
20
50
100
SAFE OPERATING AREA
10
1
O
0.1
Pulse Operation Only
(Limit rms current to
≤
3A)
Current-Limited
Output current can
be limited to less
than 3A—see text.
T
C
= 125°C
T
C
= 85°C
T
C
= 25°C
PD=50W
PD=26W
PD=10W
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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。