Typical Applications - Analog Devices LINEAR LTM 8005 Manual

TYPICAL APPLICATIONS

1.2A at up to 17V LED String from 6V to 18V
V
IN
6V TO 18V
L: COILCRAFT XAL8080-103ME
C : MURATA GRM31CR71E106KA12
IN
C : MURATA GRM32ER71H106KA12
OUT
PIN NOT USED IN THIS CIRCUIT: IVINCOMP
V
IN
6V TO 31V
38V MAX.
33V OVLO
C , C : MURATA GRM31CR71H475KA12
IN OUT1
C : SUNCON 50HVP56M
OUT2
L: XAL8080-472MEB
R : VENKEL ULCR2512-7M00JT
SENSE
1M V IVINP
C
IN
IN
2×
EN/UVLO
10µF
25V 113k
OVLO
PWM
V
REF
CTRL1
100k
CTRL2
73.2k
SS VC
2.4k
0.1µF
10nF
6V to 31V
IN
R
SENSE
7m
V IVINP
1M
C IN
IN
3×
EN/UVLO
4.7µF
50V
95.3k
OVLO
16.9k
PWM
V
REF
CTRL1
CTRL2
IVINCOMP
SS VC
10k
0.22µF
22nF
For more information
(Buck-Boost Mode) with Spread Spectrum
IN
L
10µH
IVINN SW DA
LTM8005
ISMON
RT GND OPENLED SHORTLED
23.2k
f = 350kHz
to 36V Boost Regulator
IN OUT
L
4.7µH
IVINN SW DA
LTM8005
RT GND OPENLED SHORTLED
31.6k
f = 250kHz
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LTM8005
C
LED
V
OUT
OUT
2×
STRING
10µF
50V
ISN
LED
348k
AUX
V
IN
(OPTIONAL ULTRA-FAST
FB
DIODE IF LED STRING
IS FAR AWAY)
21.5k
RAMP
0.1µF
6.8nF
V
+
OUT
C
OUT
C
OUT2
3×
56µF
4.7µF
ISN
50V
LED
AUX
348k
FB
ISMON
12.4k
RAMP
0.1µF
8005 TA02
V
OUT
36V
8005 TA03
Rev. B
21