HCPL-4562-020 Datasheet, PDF (16/17 Pages) AVAGO TECHNOLOGIES LIMITED – High Bandwidth, Analog/Video Optocouplers

Conversion from HCPL‑4562 to HCNW4562
In order to obtain similar circuit performance when
converting from the HCPL-4562 to the HCNW4562,
it is recommended to increase the Quiescent Input
Current, I_FQ, from 6 mA to 10 mA. If the application circuit
in Figure 4 is used, then potentiom­eter R4 should be
adjusted appropriately.
Design Considerations of the Application Circuit
The appÏication circuit in Figure 4 incorporates
several features that help maximize the bandwidth
performance of the HCPL-4562/HCNW4562. Most
important of these features is peaked response of the
detector circuit that helps extend the frequency range
over which the voltage gain is relatively constant. The
number of gain stages, the overall circuit topology, and
the choice of DC bias points are all consequences of
the desire to maximize bandwidth performance.
To use the circuit, first select R₁ to set V_E for the desired
LED quiescent current by:
I_FQ =
V_E
R₄
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G_V V_E R ₁₀
( � I _PB /� I _F) R ₇R ₉
(1)
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(5)
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stage (Q₃)^{( 8}i⁾s
(9)
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stage (Q₅
increased(
in
9to)
Finally, adjust R₄ to achieve the desired voltage gain.
G_V
≈�
V_OUT
V_{I N}
�≈
� I_PB
� I_F
R ₇R ₉
R ₄R ₁₀
(10)
where typically ^{� IPB} = 0.0032
� I_F
Definition:
G_V = Voltage Gain
I_FQ = Quiescent LED forward current
i_Fp-p = Peak-to-peak small signal LED forward
current
V_INp-p = Peak-to-peak small signal input voltage
i_PBp-p = Peak-to-peak small signal
base photo current
I_PBQ = Quiescent base photo current
V_BEX = Base-Emitter voltage of HCPL-4562/
HCNW4562 transistor
I_BXQ = Quiescent base current of HCPL-4562/
HCNW4562 transistor
h_FEX = Current Gain (I_C/I_B) of HCPL-4562/
HCNW4562 transistor
V_E = Voltage across emitter degeneration
resistor R₄
f_T4  = Unity gain frequency of Q₅
C_CQ3  = Effective capacitance from collector of Q₃
to ground