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NCP5008 Fiches technique(PDF) 13 Page - ON Semiconductor

No de pièce NCP5008
Description  Backlight LED Boost Driver
PDF  20 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP5008 Fiches technique(HTML) 13 Page - ON Semiconductor

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NCP5008, NCP5009
http://onsemi.com
13
DC/DC Converter Operation
The DC/DC converter operates with a boost structure
depicted in Figure 21, the load being supplied by the pulsed
current coming from the external inductor L1. The current
is monitored by the internal sense resistor Rsense to Set and
Reset the flip−flop U3 and U6 according to the comparators
U2 and U4 output state.
Figure 21. Basic DC/DC Boost Structure
+
−
+
−
Vbat
GND
U1
Rsense
1R8
Vbat
L1
Vbat
L1
22
mH
L2
Q1
GND
Vbat
GND
Ipeak_ref
Ivalley_ref
Vbat
+
−
U2
U4
GND
POR
U5
D4
LED
D3
LED
D2
LED
D1
LED
D5
MBR0520
GND
GND
C2
2.2
mF/16 V
U7
U3
U6



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