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NCP5008 Datasheet(PDF) 10 Page - ON Semiconductor

Part # NCP5008
Description  Backlight LED Boost Driver
Download  17 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP5008 Datasheet(HTML) 10 Page - ON Semiconductor

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NCP5008, NCP5009
http://onsemi.com
10
Set Up Output Current Range
Figure 20. Functional Diagram
Vbat
+
−
1
1
Vbat
BandGap
GND
Iref
GND
Vbat
+
−
1
1
Vbat
BandGap
GND
Photo
Q1
NPN−PHOTO
GND
GND
GND
1:Bn
GND
GND
1
GND
2:1
Vbat
1
1:746
I = (Iref−Iphoto)*(Bn+0.5)
Iout Reference
= (Iref−Iphoto)*746*(Bn+0.5)
Rref
30 k
Iref
Iphoto
1
1
The current sunk to ground on PHOTO pin is subtracted
from the current sunk to ground on Iref pin. The result is
multiplied by the programmed value (Bn) and then
multiplied by the constant factor ratio (k = 746) in the
current mirror.
The constant factor k is a ratio between the current on
Iout sense and the Iout reference internally fixed.
The output current reference is:
Ipeak = Ivalley + (Iref − Iphoto) * Bn * k.
Where k = 746, Bn represents the bit of the internal shift
register, range from 1 to 7, and Ivalley = (Iref − Iphoto)
* 0.5 * k.
We can write also Ipeak = (Iref − Iphoto) * (Bn + 0.5) * k.
Please find below the formula to quickly calculate R1
resistor (resistor on Iref pin):
Iref +
1.24
R1


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