Diodes ZXLD1370 - Manual (Page 11)

ZXLD1370
Document number: DS32165 Rev. 5 - 2
11 of 39
www.diodes.com
September 2012
© Diodes Incorporated
ZXLD1370
A Product Line of
Diodes Incorporated
Typical Characteristics
(cont.) Buck Mode – R
S
= 300mΩ, L = 47µH
0.715
0.720
0.725
0.730
0.735
0.740
6.5 11 15.5 20 24.5 29 33.5 38 42.5 47 51.5 56 60.5
INPUT VOLTAGE (V)
Figure 12 I vs. Input & Number of LED
LED
2 LEDs 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LEDs
LE
D CURREN
T
(
A
)
T = 25°C
V
= V
A
AUX IN
0
100
200
300
400
500
600
700
800
900
1000
INPUT VOLTAGE (V)
Figure 13 Frequency ZXLD1370 - Buck Mode - L47µH
2 LEDs 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LEDs
SW
IT
CH
ING F
R
EQUENCY (
kHz
)
T = 25°C
V
= V
A
AUX
IN
6.5 11 15.5 20 24.5 29 33.5 38 42.5 47 51.5 56 60.5
100
INPUT VOLTAGE (V)
Figure 14 Efficiency vs. Input Voltage & Number of LED
2 LEDs 3 LEDs 5 LEDs 7 LEDs 9 LEDs 11 LEDs 13 LEDs 15 LEDs
T = 25°C
V
= V
A
AUX IN
E
F
F
IC
IE
N
C
Y
(%
)
6.5 11 15.5 20 24.5 29 33.5 38 42.5 47 51.5 56 60.5
95
90
85
80
75
70
65
60