nx2154 Microsemi Corporation, nx2154 Datasheet - Page 15

• Manufacturer Part Number: nx2154
• Description: 300khz Synchronous Pwm Controller
• Manufacturer: Microsemi Corporation

TYPICAL APPLICATION FOR LED
Waveforms for LED application
Rev.1.2
02/26/07
0.85
0.75
0.65
0.55
0.9
0.8
0.7
0.6
0
Figure 11 - LED application efficiency
(One LUXEDN III star LED, VIN=12V)
1uF
0.2
56pF
0.4
10k
1N4148
LED CURRENT(A)
1.6k
68nF
0.6
7
6
POT 100k
1k
1uF
Comp
Fb
NX2154
5
Vcc
0.8
+5V
Figure 10 - NX2154 LED application
Gnd
3
BST
1
1
Hdrv
Ldrv
SW
D1 MBR0530T1
2
8
4
1.2
78L05
0.1uF
Figure 12 - Startup in NX2154 LED application
LM358
IRF7341
10uH
+9V to 33V
1uF
Vin
220uF
0.1ohm
LUXEON III star LED
NX2154/2154A
Co
1000uF,30mohm
Vout
15