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参数资料
| 型号： | PA41A |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 电压反馈运算放大器 |
| 文件页数： | 4/4页 |
| 文件大小： | 133K |
| 代理商： | PA41A |
OPERATING
CONSIDERATIONS
PA41/PA42 PA41A/PA42A
GENERAL
Please read Application Note 1 "General Operating Consid-
erations" which covers stability, supplies, heat sinking, mount-
ing, current limit, SOA interpretation, and specification inter-
pretation. Visit www.apexmicrotech.com for design tools that
help automate tasks such as calculations for stability, internal
power dissipation, current limit; heat sink selection; Apex’s
complete Application Notes library; Technical Seminar Work-
book; and Evaluation Kits.
CURRENT LIMIT
For proper operation the current limit resistor, R
CL, must be
connected as shown in the external connection diagram. The
minimum value is 18 ohms, however for optimum reliability the
resistor value should be set as high as possible. The value can
be estimated as follows with the maximum practical value of
500 ohms.
3
R
CL =
I
LIM
Use the typical performance graphs as a guide for expected
variations in current limit value with a given R
CL and variations
over temperature. The selected value of R
CL must be added to
the specified typical value of output resistance to calculate the
total output resistance. Since the load current passes through
R
CL the value selected also affects the output voltage swing
according to:
V
R = IO
R
CL
where V
R is the voltage swing reduction.
When the amplifier is current limiting, there may be small
signal spurious oscillation present during the current limited
portion of the negative half cycle. The frequency of the oscil-
lation is not predictable and depends on the compensation,
gain of the amplifier, and load. The oscillation will cease as the
amplifier comes out of current limit.
INPUT PROTECTION
The PA41/42 inputs are protected against common mode
voltages up the supply rails and differential voltages up to
±16
volts as well as static discharge. Differential voltages exceed-
ing 16 volts will be clipped by the protection circuitry. However,
if more than a few milliamps of current is available from the
overload source, the protection circuitry could be destroyed.
The protection circuitry includes 300 ohm current limiting
resistors at each input, but this may be insufficient for severe
overloads. It may be necessary to add external resistors to the
application circuit where severe overload conditions are ex-
pected. Limiting input current to 1mA will prevent damage.
STABILITY
The PA41/42 has sufficient phase margin when compen-
sated for unity gain to be stable with capacitive loads of at least
10 nF. However, the low pass circuit created by the sumpoint
(–in) capacitance and the feedback network may add phase
shift and cause instabilities. As a general rule, the sumpoint
load resistance (input and feedback resistors in parallel)
should be 5K ohm or less at low gain settings (up to 10).
Alternatively, use a bypass capacitor across the feedback
resistor. The time
constant of the feedback resistor and
bypass capacitor combination should match the time constant
of the sumpoint resistance and sumpoint capacitance.
The PA41/42 is externally compensated and performance
can be tailored to the application. Use the graphs of small
signal gain and phase response as well as the graphs for slew
rate and power response as a guide. The compensation
capacitor C
C must be rated at 350V working voltage. The
compensation capacitor and associated resistor R
C must be
mounted closely to the amplifier pins to avoid spurious oscilla-
tion. An NPO capacitor is recommended for compensation.
SAFE OPERATING AREA (SOA)
The MOSFET output stage of this power operational ampli-
fier has two distinct limitations:
1. The current handling capability of the die metallization.
2. The temperature of the output MOSFETs.
NOTE: The output stage is protected against transient
flyback. However, for protection against sustained, high en-
ergy flyback, external fast-recovery diodes should be used.
*
SUPPLY TO OUTPUT DIFFERENTIAL, V
S -VO (V)
10
20
30
50
100
200
300
500
OUTPUT
CURRENT
FROM
+V
S
OR
–
V
S
,(mA)
2
3
4
5
10
20
30
40
50
100
DC,
T
C
=
125
°C
DC,
T
C
=
85
°C
DC
PULSE CURVES @ 10% DUTY CYCLE MAX
PA42 SOA
SUPPLY TO OUTPUT DIFFERENTIAL, V
S -VO (V)
10
20
30
50
100
200
300
500
OUTPUT
CURRENT
FROM
+V
S
OR
–
V
S
,(mA)
2
3
4
5
10
20
30
40
50
100
DC,
T
C
=
125
°C
DC,
T
C
=
85
°C
DC
300mS
PULSE CURVES @ 10% DUTY CYCLE MAX
PA41 SOA
200mS
120
200
100mS
200mS
300mS
120
200
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
PA41/42U REV. G JANUARY 1999
1999 Apex Microtechnology Corp.
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相关PDF资料 |
PDF描述 |
|---|---|
| PA42A | Voltage-Feedback Operational Amplifier |
| PA42 | IC-HI-VOLTAGE POWER OP-AMP |
| PA43 | Voltage-Feedback Operational Amplifier |
| PA82-W-9C | GENERAL PURPOSE INDUCTOR |
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相关代理商/技术参数 |
参数描述 |
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| PA41DIE | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
| PA41EC1100 | 功能描述:按钮开关 Off-(On) Black RoHS:否 制造商:C&K Components 触点形式:2 NC - 2 NO 开关功能:ON ? OFF 电流额定值:4 A 电压额定值 AC:12 V to 250 V 电压额定值 DC:12 V to 50 V 功率额定值: 安装风格:Through Hole 照明:Illuminated 照明颜色:None IP 等级:IP 40 端接类型:Solder 触点电镀:Silver 执行器:Square 盖颜色: 封装: 可燃性等级:UL 94 V-0 |
| PA41M | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
| PA42 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:IC-HI-VOLTAGE POWER OP-AMP |
| PA420 | 功能描述:交流电源输入模块 Conversion Clip extends by .20" RoHS:否 制造商:Schurter 过滤:Yes 过滤器类型:IEC Inlet Filters 产品:Inlets 电流额定值:4 A 电压额定值:250 VAC 外壳材料:Thermoplastic 安装风格:Panel, Screw 端接类型:Quick Connect 工作温度范围:- 25 C to + 85 C 连接器类型:C-14 |
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