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SM8610CV Arkusz danych(PDF) 7 Page - Nippon Precision Circuits Inc

Numer części SM8610CV
Szczegółowy opis  Laser Switching Driver IC
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Producent  NPC [Nippon Precision Circuits Inc]
Strona internetowa  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8610CV Arkusz danych(HTML) 7 Page - Nippon Precision Circuits Inc

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SM8610CV
NIPPON PRECISION CIRCUITS INC.—7
Laser Diode Drive Current Mid-value Set Function
The laser diode drive current mid-value can be adjusted by changing the resistance RLD connected between the
LDISET and GND pins. The laser diode drive current mid-value base value ILDSET, given by the following
equation, is set to the LDIOUT output current when the PDVIN voltage is in balance state (147 to 193mV).
Note that the actual LDIOUT current may change due to feedback gain, and laser diode/photo diode variations.
APC Loop Gain Setting
The APC (Auto Power Control) loop gain can be adjusted by changing the external gain set resistance (RG)
connected between the RG1 and RG2 pins. The PDVIN voltage-to-laser drive current open-loop gain is given
approximately by the following equation.
APC Loop Cutoff Frequency Setting
The APC loop cutoff frequency fc is determined by the external resistance RG and the capacitance CG, con-
nected between RG1 and RG2.
If CG is connected between RG2 and VCC, the cutoff frequency is given as follows.
RLD : LDISET connected resistance [Ω]
∆LDIOUT current /∆PDVIN voltage ratio [S]
RG : Resistance connected between RG1 and RG2 [Ω]
ILDSET = ILDSET
× 1000 =
RLD
800[V]
[A]
GmPDVIN = 9.1
× 10 −5 RG [S]
fC1 =
2
πRGCG
1
[Hz]
fC2 =
2
πRGCG
1
[Hz]
2


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