Diodes ZXLD1370 - Manual (Page 9)

ZXLD1370
Document number: DS32165 Rev. 5 - 2
9 of 39
www.diodes.com
September 2012
© Diodes Incorporated
ZXLD1370
A Product Line of
Diodes Incorporated
Typical Characteristics
(cont.)
0
250
500
750
1000
1250
1500
0 0.5 1 1.5 2 2.5
0
150
300
450
600
750
900
S
W
IT
CHING F
R
EQUEN
C
Y
(k
H
z)
LE
D
CURRENT
(
m
A
)
ADJ VOLTAGE (V)
Figure 5 Buck LED Current, Switching Frequency vs. V
ADJ
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
0 0.5 1 1.5 2 2.5
0
200
400
600
800
1000
1200
1400
SW
IT
CH
ING F
R
E
Q
UENCY
(k
Hz
)
ADJ VOLTAGE
Figure 6 Buck-Boost LED Current, Switching Frequency vs. V
ADJ
T = 25°C
V
= V = 24V
8LEDs
L = 33 H
GI = 0.23
R = 300m
A
AUX IN
S
µ
Ω
L
E
D CUR
RE
NT
(
m
A)
Switching
Frequency
I
LED
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 2.25 2.5
0
100
200
300
400
500
600
700
SW
IT
C
HI
NG
F
R
E
Q
UE
N
C
Y(
kH
z)
ADJ VOLTAGE
Figure 7 Boost LED Current, Switching Frequency vs. V
ADJ
LE
D
C
U
R
R
EN
T
(mA
)
Switching
Frequency
I
LED
T = 25°C
V
= V = 12V
12 LEDs
L = 33 H
R = 300m
A
AUX
IN
S
µ
Ω
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
6 12 18 24 30 36 42 48 54 60
D
U
T
Y
INPUT VOLTAGE (V)
Figure 8 Duty Cycle vs. Input Voltage
T = 25 C
L = 33µH
R = 150m
Buck Mode
2 LEDS
A
S
°
Ω