Diodes ZXLD1374 - Manual (Page 11)

ZXLD1374
Document number: DS35032 Rev. 3 - 2
11 of 39
www.diodes.com
September 2012
© Diodes Incorporated
ZXLD1374
A Product Line of
Diodes Incorporated
Typical Characteristics –
Buck Mode – R
S
= 291mΩ, L = 35µH, I
LED
= 750mA
0.675
0.700
0.725
0.750
0.775
0.800
0.825
6 12 18 24 30 36 42 48 54 60
INPUT VOLTAGE (V)
Figure 14 I vs. Input Voltage and Number of LED
LED
L
E
D
CU
RR
E
N
T
(A
)
T = 25°C
V
= V
L = 33µH
R = 291m
A
AUX IN
S
Ω
3 LEDs
1 LED 5 LEDs
7 LEDs 11 LEDs
13 LEDs 9 LEDs
15 LEDs
0
100
200
300
400
500
600
700
800
900
1000
6 12 18 24 30 36 42 48 54 60
INPUT VOLTAGE (V)
Figure 15 Frequency ZXLD1374 - Buck Mode = L = 47 H μ
F
R
E
Q
UE
NCY
(k
Hz
)
T = 25°C
V
= V
L = 33µH
R = 291m
A
AUX IN
S
Ω
15 LEDs 13 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 16 Efficiency vs. Input Voltage and Number of LED
T = 25°C
V
= V
L = 33µH
R = 291m
A
AUX IN
S
Ω
E
F
F
IC
IE
N
C
Y
15 LEDs 13 LEDs 11 LEDs 9 LEDs 7 LEDs 5 LEDs
3 LEDs
1 LED