Analog applications, High speed isolation amplifier, Description – Avago Technologies ACPL-224-500E User Manual
Page 41: Performance of optocoupler, Benefits, References, Alternative avago parts
AV02-4387EN
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Avago Technologies
High Speed Isolation Amplifier
Description
This is a high-speed, low-cost isola-
tion amplifier for use in the feedback
path of switch-mode power supplies
or motor speed and position meas-
urement. This circuit can be used
in applica tions where high band-
width, low-cost, and stable gain are
required, but where accuracy is not
critical.
Performance of Optocoupler
• 1.5 MHz bandwidth
• Stable gain
• Lowcost support circuit
• Circuit couples only positive volt-
age signals
Benefits
• Low cost solution for coupling
positive voltage analog signals
• Simple way for sending power
supply voltage feedback signal
across isolation barrier
References
HCNR200/1 Technical Data
Alternative Avago Parts
1) HCPL-7800A, HCPL-7800, HCPL-
7840 Isolation Amplifier
2) HCPL-4562 Wideband Analog/
Video Optocoupler
3) HCPL-785X Hermetically Sealed
Isolation Amplifier
Analog Applications
V
IN
V
CC1
+5 V
R1
68 k
Ω
PD1
LED
R3
10 k
Ω
Q1
2N3906
R4
10
Ω
Q2
2N3904
V
CC2
+5 V
R2
68 k
Ω
PD2
R5
10 k
Ω
Q3
2N3906
R6
10
Ω
Q4
2N3904
R7
470
V
OUT
8
7
6
1
3
HCNR200/1
5
2
4
LED
NC
NC
PD1 PD2
K1
K2
ISOLATION
BARRIER