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参数资料
| 型号： | IL300-DEFG-X019 |
| 厂商： | VISHAY SEMICONDUCTORS |
| 元件分类： | 光电元器件 |
| 英文描述： | SPECIALTY OPTOELECTRONIC DEVICE |
| 封装： | ROHS COMPLIANT, SMD, 8 PIN |
| 文件页数： | 15/15页 |
| 文件大小： | 176K |
| 代理商： | IL300-DEFG-X019 |
VISHAY
IL300
Document Number 83622
Rev. 1.5, 24-Mar-05
Vishay Semiconductors
www.vishay.com
9
The isolated amplifier provides the PWM control sig-
nal which is derived from the output supply voltage.
Figure 16 more closely shows the basic function of
the amplifier.
The control amplifier consists of a voltage divider and
a non-inverting unity gain stage. The TDA4918 data
sheet indicates that an input to the control amplifier is
a high quality operational amplifier that typically
requires a +3.0 V signal. Given this information, the
amplifier circuit topology shown in Figure 18 is
selected.
The power supply voltage is scaled by R1 and R2 so
that there is + 3.0 V at the non-inverting input (Va) of
U1. This voltage is offset by the voltage developed by
photocurrent flowing through R3. This photocurrent is
developed by the optical flux
created by current flowing through the LED. Thus as
the scaled monitor voltage (Va) varies it will cause a
change in the LED current necessary to satisfy the dif-
ferential voltage needed across R3 at the inverting
input.
The first step in the design procedure is to select the
value of R3 given the LED quiescent current (IFq) and
the servo gain (K1). For this design, IFq = 12 mA. Fig-
ure 4 shows the servo photocurrent at IFq is found to
be 100
A. With this data R3 can be calculated.
For best input offset compensation at U1, R2 will
equal R3. The value of R1 can easily be calculated
from the following.
The value of R5 depends upon the IL300 Transfer
Gain (K3). K3 is targeted to be a unit gain device,
however to minimize the part to part Transfer Gain
variation, Infineon offers K3 graded into ± 5 % bins.
R5 can determined using the following equation,
Or if a unity gain amplifier is being designed (VMON-
ITOR = VOUT, R1 = 0), the equation simplifies to:
Figure 16. Isolated Control Amplifier
R3 =
Vb
IPI
=
3V
100
A
=30K
17164
iil300_16
+
-
Voltage
Monitor
R1
R2
To Control
Input
ISO
AMP
+1
R1=R2
(
VMONITOR
Va
- 1
)
17165
R5 =
VOUT
VMONITOR
R3(R1 + R2)
R2K3
17166
R5 =
R3
K3
17190
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相关代理商/技术参数 |
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| IL300-E | 功能描述:高线性光耦合器 High Gain Wide Bandwidth Linear RoHS:否 制造商:Avago Technologies 输入类型:AC/DC 最大正向二极管电压:1.95 V 最大反向二极管电压:2.5 V 最大输入二极管电流:25 mA 最大功率耗散:60 mW 最大工作温度:+ 100 C 最小工作温度:- 55 C 封装 / 箱体:DIP-8 Gull Wing 封装:Tube |
| IL300-E | 制造商:Vishay Semiconductors 功能描述:OPTOCOUPLER |
| IL300-EF | 功能描述:高线性光耦合器 High Gain Wide Bandwidth Linear RoHS:否 制造商:Avago Technologies 输入类型:AC/DC 最大正向二极管电压:1.95 V 最大反向二极管电压:2.5 V 最大输入二极管电流:25 mA 最大功率耗散:60 mW 最大工作温度:+ 100 C 最小工作温度:- 55 C 封装 / 箱体:DIP-8 Gull Wing 封装:Tube |
| IL300-EF-X001 | 功能描述:高线性光耦合器 Single Linear, High Gain, Wide Bandwidth RoHS:否 制造商:Avago Technologies 输入类型:AC/DC 最大正向二极管电压:1.95 V 最大反向二极管电压:2.5 V 最大输入二极管电流:25 mA 最大功率耗散:60 mW 最大工作温度:+ 100 C 最小工作温度:- 55 C 封装 / 箱体:DIP-8 Gull Wing 封装:Tube |
| IL300-EF-X006 | 功能描述:高线性光耦合器 Single Linear, High Gain, Wide Bandwidth RoHS:否 制造商:Avago Technologies 输入类型:AC/DC 最大正向二极管电压:1.95 V 最大反向二极管电压:2.5 V 最大输入二极管电流:25 mA 最大功率耗散:60 mW 最大工作温度:+ 100 C 最小工作温度:- 55 C 封装 / 箱体:DIP-8 Gull Wing 封装:Tube |
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