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HCPL-7820 参数 Datasheet PDF下载

HCPL-7820图片预览
型号: HCPL-7820
PDF下载: 下载PDF文件 查看货源
内容描述: 高CMR模拟隔离放大器 [High CMR Analog Isolation Amplifiers]
分类和应用: 隔离放大器光电二极管分离技术隔离技术
文件页数/大小: 15 页 / 229 K
品牌: HP [ HEWLETT-PACKARD ]
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Applications Information  
Functional Description  
signal, which is filtered to obtain  
the final output signal.  
300  
250  
200  
150  
100  
Figure 23 shows the primary  
functional blocks of the HCPL-  
7820/7825. In operation, the  
sigma-delta modulator converts  
the analog input signal into a  
high-speed serial bit stream. The  
time average of this bit stream is  
directly proportional to the input  
signal. This stream of digital data  
is encoded and optically trans-  
mitted to the detector circuit. The  
detected signal is decoded and  
converted back into an analog  
Application Circuit  
P , OUTPUT  
S
The recommended application  
circuit is shown in Figure 24. 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  
three-terminal voltage regulator  
(U1). The voltage from the cur-  
rent sensing resistor, or shunt  
(RSENSE), is applied to the input of  
P , INPUT  
S
MAX. OPERATING  
TEMP. IS 100 °C  
50  
0
0
50  
100  
150  
200  
T
– TEMPERATURE – °C  
A
Figure 22. Dependence of Safety-  
Limiting Values on Temperature.  
VOLTAGE  
CLOCK  
VOLTAGE  
REGULATOR  
GENERATOR  
REGULATOR  
ISOLATION  
BOUNDARY  
Σ∆  
LED DRIVE  
CIRCUIT  
DETECTOR  
CIRCUIT  
DECODER  
AND D/A  
ISO-AMP  
OUTPUT  
ISO-AMP  
INPUT  
ENCODER  
FILTER  
MODULATOR  
Figure 23. HCPL-7820/7825 Block Diagram.  
FLOATING  
SUPPLY  
HV+  
C5  
75 pF  
GATE DRIVE  
CIRCUIT  
• • •  
R3  
FLOATING  
SUPPLY  
10.0 K  
U1  
78L05  
+5 V  
+15 V  
C8  
0.1 µF  
IN OUT  
C1  
C2  
1
2
8
7
C4  
0.1  
µF  
0.1  
µF  
0.1 µF  
R5  
39 Ω  
R1  
2.00 KΩ  
C3  
V
U3  
U2  
OUT  
0.01  
µF  
R2  
+
6
5
3
4
MC34081  
2.00 KΩ  
MOTOR  
+
C7  
• • •  
R
SENSE  
C6  
75 pF  
R4  
10.0 KΩ  
0.1 µF  
HCPL-7820/7825  
-15 V  
• • •  
HV–  
Figure 24. Recommended Application Circuit.  
1-244