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參數(shù)資料
| 型號： | HCPL-7840 |
| 元件分類： | 運動控制電子 |
| 英文描述： | Isolation Amplifier(隔離放大器) |
| 中文描述： | 隔離放大器（隔離放大器） |
| 文件頁數(shù)： | 12/19頁 |
| 文件大?。?/td> | 244K |
| 代理商： | HCPL-7840 |
12
Application Information
Power Supplies and Bypassing
The recommended supply con-
nections are shown in Figure 17.
A floating power supply (which in
many applications could be the
same supply that is used to drive
the high-side power transistor) is
regulated to 5 V using a simple
zener diode (D1); the value of
resistor R4 should be chosen to
supply sufficient current from
the existing floating supply. The
voltage from the current sensing
resistor (Rsense) is applied to the
input of the HCPL-7840 through
an RC anti-aliasing filter (R2 and
C2). Although the application
circuit is relatively simple, a
few recommendations should
be followed to ensure optimal
performance.
The power supply for the
HCPL -7840 is most often obtained
from the same supply used to
power the power transistor gate
drive circuit. If a dedicated
supply is required, in many
cases it is possible to add an
additional winding on an exist-
ing transformer. Otherwise,
some sort of simple isolated
supply can be used, such as a line
powered transformer or a high-
frequency DC-DC converter.
An inexpensive 78L05 three-
terminal regulator can also be
used to reduce the floating supply
voltage to 5 V. To help attenuate
high-frequency power supply
noise or ripple, a resistor or
inductor can be used in series
with the input of the regulator
to form a low-pass filter with
the regulator’s input bypass
capacitor.
Figure 17. Recommended Supply and Sense Resistor Connections.
HCPL-7840
C1
0.1 μF
R2
39
GATE DRIVE
CIRCUIT
FLOATING
POWER
SUPPLY
HV+
HV–
–
+
R
SENSE
MOTOR
C2
0.01 μF
D1
5.1 V
–
+
R1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HCPL-7840#060 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| HCPL-7840#300 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| HCPL-7840#360 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| HCPL-7840#500 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
| HCPL-7840#560 | 功能描述:隔離放大器 4.5 - 5.5 SV 8 dB RoHS:否 制造商:Texas Instruments 輸入補償電壓:1.5 mV 共模抑制比（最小值）:95 dB 帶寬:60 KHz 工作電源電壓:3.3 V 電源電流:8 mA 工作溫度范圍:- 40 C to + 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOP-8 封裝:Tube |
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