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NCP5005
Digital Control
Due to the EN pin, a digitally controlled luminosity can
be implemented by providing a PWM signal to this pin (see
Cycle, but care must be observed as the DC/DC converter
is continuously pulsed ON/OFF and noise are likely to be
generated.
Figure 31). The output current depends upon the Duty
V bat
Pulse
4
U1
EN
V bat
5
C1
4.7 m F
L1
22 m H
GND
GND
2
3
GND
FB
V out 1
D1
MBR0530
V load
NCP5005
C2
1.0 m F
R1
D6
D5
D4
D3
D2
GND
22 W
LWT67C LWT67C LWT67C LWT67C LWT67C
GND
NOTE: Pulse width and frequency depends upon the application constraints.
Figure 31. Typical Semi?Pulsed Mode of Operation
The PWM operation, using the EN pin as a digital
control, is depicted in Figures 32 and 33. The tests have
been carried out at room temperature with V bat = 3.60 V,
L = 22 m H, five LEDs in series, RFB = 22 W .
PWM
V load
VFB
VPWM
Figure 32. Operation @ PWM = 10 kHz, DC = 10%
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