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NCP5005
TYPICAL APPLICATIONS CIRCUITS
Standard Feedback
The standard feedback provides a constant current to the
LED, independently of the V bat supply and number of LED
V bat
U1
associated in series. Figure 28 depicts a typical application
to supply 13 mA to the load.
V bat
C1
4
EN
V bat
5
4.7 m F
L1
22 m H
GND
GND
2
3
GND
FB
V out 1
D1
MBR0530
NCP5005
C2
1.0 m F
GND
R1
D6
D5
D4
D3
D2
GND
15 W
LWT67C LWT67C LWT67C LWT67C LWT67C
Figure 28. Basic DC Current Mode Operation with Analog Feedback
PWM Operation
The analog feedback Pin 3 provides a way to dim the
LED by means of an external PWM signal as depicted in
Figure 29. By optimizing the internal high impedance
presented by the FB pin, one can set up a simple R/C
network to accommodate such a dimming function. Two
modes of operation can be considered:
? Pulsed mode, with no filtering
? Averaged mode with filtering capacitor
Although the pulsed mode will provide a good dimming
start and stop the converter, yielding high transients . These
transients might generate spikes difficult to filter out in the
rest of the application, a situation not recommended. The
output current depends upon the duty cycle of the signal
presented to the node Pin 3: this is very similar to the digital
control discussed in Figure 31.
The average mode yields a noise free operation since the
converter operates continuously, together with a very good
dimming function. The cost is an extra resistor and one
extra capacitor, both being low cost parts.
function, from a human eye standpoint, it will continuously
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