Diodes ZXLD1374 - Manual (Page 10)

ZXLD1374
Document number: DS35032 Rev. 3 - 2
10 of 39
www.diodes.com
September 2012
© Diodes Incorporated
ZXLD1374
A Product Line of
Diodes Incorporated
Typical Characteristics –
Buck Mode – R
S
= 146mΩ, L = 35µH, I
LED
= 1.5A
1.35
1.40
1.45
1.50
1.55
1.60
1.65
6 12 18 24 30 36 42 48 54 60
INPUT VOLTAGE (V)
Figure 11 Load Current vs. Input Voltage and Number of LED
L
E
D
C
U
R
R
E
N
T
(A
)
T = 25°C
V
= V
L = 33µH
R = 146m
A
AUX IN
S
Ω
1 LED 3 LEDs 5 LEDs 7 LEDs
9 LEDs 13 LEDs 11 LEDs 15 LEDs
0
200
400
600
800
1000
1200
6 12 18 24 30 36 42 48 54 60
INPUT VOLTAGE (V)
Figure 12 Frequency vs. Input Voltage and Number of LED
SW
IT
C
H
IN
G
F
R
E
Q
U
EN
C
Y
(k
H
z)
T = 25°C
V
= V
L = 33µH
R = 146m
A
AUX IN
S
Ω
13 LEDs
15 LEDs 11 LEDs 9 LEDs
7 LEDs
5 LEDs
3 LEDs
1 LED
60%
65%
70%
75%
80%
85%
90%
95%
100%
6 12 18 24 30 36 42 48 54 60
Input Voltage (V)
Figure 13 Efficiency vs. Input Voltage and Number of LED
T = 25°C
V
= V
L = 33µH
R = 146m
A
AUX IN
S
Ω
EF
FI
C
IE
N
C
Y 13 LEDs
15 LEDs
11 LEDs 9 LEDs 7 LEDs
5 LEDs
3 LEDs
1 LED