NCP5010 ON Semiconductor, NCP5010 Datasheet - Page 15

• Manufacturer Part Number: NCP5010
• Description: Boost Converter
• Manufacturer: ON Semiconductor

Analog Dimming Control
is controlled in order to have 500 mV to the feedback input
(FB pin). The principle of this schematic is bias by a
resistive network R2/R3 the feedback voltage. If not any
DC/DC Boost Application
deliver constant voltage to powering load like OLED or
When the NCP5010 is in steady state the output voltage
The NCP5010 can be used as DC/DC Boost converter to
PWM SIGNAL
ENABLE
ENABLE
Average Network
Figure 33. Dimming Control Using a Filtered PWM Signal or a DC Voltage
C1
4.7 mF 0603
X5R 6.3 V
C1
4.7 mF 0603
X5R 6.3 V
V
Bat
V
NCP5010
Bat
R1 10 k
2.7 to 5.5 V
NCP5010
A2
2.7 to 5.5 V
A2
Figure 34. OLED or LCD Bias Supply
CTRL
CTRL
C3
470 nF
V
http://onsemi.com
OUT
L1
22 mH
V
Select
OUT
NCP5010
22 mH
L1
C1
R
290 k
R
10 k
100 k
R2
15
C1
18 k
R3
DC VOLTAGE
signal is put from outside to R2 there is no voltage drop
across R3 and I
is increasing the loop balance output voltage to get always
500 mV to FB pin. Thereby voltage across R4 decreases
like this the current in the string of LEDs.
LCD biasing. An external resistive network is connected to
sense the output voltage and close the loop.
15 V / 35 mA
C2
2.2 mF 0805
X5R 25 V
R4
24
LED
LED
L1:
C1:
C2:
OUT
TDK VLF4012AT−220MR51
TDK C1608X5R0J475MT
TDK C2012X5R1E225MT
V out + 0.5
L1:
C1:
C2:
C3:
C2
1 mF 0805
X5R 25 V
= V
TDK VLF4012AT−220MR51
TDK C1608X5R0J475MT
TDK C2012X5R1E105MT
Standard Capacitor
FB
/R4. When the voltage put to R2
R1 ) R2
R1