Avago Technologies ACPL-224-500E - Manual (Page 41)

AV02-4387EN 38 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