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参数资料
| 型号： | PA81J |
| 厂商： | Electronic Theatre Controls, Inc. |
| 元件分类： | 运算放大器 |
| 英文描述： | HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS |
| 中文描述： | 高压功率运算放大器 |
| 文件页数： | 4/4页 |
| 文件大小： | 73K |
| 代理商： | PA81J |
APEX MICROTECHNOLOGY CORPORATION
5980 NORTH SHANNON ROAD
TUCSON, ARIZONA 85741
USA
APPLICATIONS HOTLINE: 1 (800) 546-2739
PA81, 82U REV. G JANUARY 2000
2000 Apex Microtechnology Corp.
OPERATING
CONSIDERATIONS
PA81J
PA82J
SINGLE SUPPLY OPERATION
These amplifiers are suitable for operation from a single
supply voltage. The operating requirements do however, im-
pose the limitation that the input voltages do not approach
closer than 10 volts to either supply rail. This is due to the
operating voltage requirements of the current sources, the
half-dynamic loads and the cascode stage. Refer to the
simplified schematics.Thus, single supply operation requires
the input signals to be biased at least 10 volts from either
supply rail. Figure 3 illustrates one bias technique to achieve
this.
GENERAL
Please read Application Note 1 , which covers stability,
supplies, heatsinking, mounting, current limit, SOA interpreta-
tion, and specification interpretation. Additional information
can be found in the application notes. For information on the
package outline, heatsinks, and mounting hardware, consult
the
“
Accessory and Package Mechanical Data
”
section of the
handbook.
SAFE OPERATING AREA (SOA)
For the PA80J and PA81J, the combination of voltage
capability and internal current limits mandate that the devices
are safe for all combinations of supply voltage and load. On the
PA82J, any load combination is safe up to a total supply of 250
volts. When total supply voltage equals 300 volts, the device
will be safe if the output current is limited to 10 milliamps or less.
This means that the PA82J used on supplies up to 125 volts will
sustain a short to common or either supply without danger.
When using supplies above
±
125 volts, a short to one of the
supplies will be potentially destructive. When using single
supply above 250 volts, a short to common will be potentially
destructive.
Safe supply voltages do not imply disregard for heatsinking.
The thermal calculations and the use of a heatsink are required
in many applications to maintain the case temperature within
the specified operating range of 0 to 70
°
C. Exceeding this case
temperature range can result in an inoperative circuit due to
excessive input errors or activation of the thermal shutdown.
INDUCTIVE LOADS
Two external diodes as shown in Figure 2, are required to
protect these amplifiers against flyback (kickback) pulses
exceeding the supply voltage of the amplifier when driving
inductive loads. For component selection, these external
diodes must be very quick, such as ultra fast recovery diodes
with no more than 200 nanoseconds of reverse recovery time.
Be sure the diode voltage rating is greater than the total of both
supplies. The diode will turn on to divert the flyback energy into
the supply rails thus protecting the output transistors from
destruction due to reverse bias.
A note of caution about the supply. The energy of the flyback
pulse must be absorbed by the power supply. As a result, a
transient will be superimposed on the supply voltage, the
magnitude of the transient being a function of its transient
impedance and current sinking capability. If the supply voltage
plus transient exceeds the maximum supply rating, or if the AC
impedance of the supply is unknown, it is best to clamp the
output and the supply with a zener diode to absorb the
transient.
+V
S
–
V
S
FIGURE 2.
PROTECTION,
INDUCTIVE LOAD
+210V
50K
PA82J
FIGURE 3.
TRUE SINGLE
SUPPLY OPERATION
D/A
+50/+200V
+210V
50K
2.5K
2.5K
2.5/10V
50K
+210V
50K
Figure 4 illustrates a very common deviation from true single
supply operation. The availibility of two supplies still allows
ground (common) referenced signals, but also maximizes the
high voltage capability of the unipolar output. This technique
can utilize an existing low voltage system power supply and
does not place large current demands on that supply. The 12
volt supply in this case must supply only the quiescent current
of the PA81J, which is 8.5mA maximum. If the load is reactive
or EMF producing, the low voltage supply must also be able to
absorb the reverse currents generated by the load.
+12V
–
130V
50K
PA81J
FIGURE 4.
NON-SYMMETRIC
SUPPLIES
0/5V
D/A
0/
–
125V
2K
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| PA82J | 功能描述:运算放大器 - 运放 Linear Op-Amp 150V .03A .015A RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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