Diodes ZXLD1374 - Manual (Page 14)

ZXLD1374
Document number: DS35032 Rev. 3 - 2
14 of 39
www.diodes.com
September 2012
© Diodes Incorporated
ZXLD1374
A Product Line of
Diodes Incorporated
Typical Characteristics –
Buck - Boost Mode – R
S
= 150mΩ, L = 33µH, I
LED
= 350mA, GI
RATIO
= 0.23 with Bootstrap
0.315
0.325
0.335
0.345
0.355
0.365
0.375
0.385
6.5 8.0 9.5 11.0 12.5 14.0 15.5 17.0
INPUT VOLTAGE (V)
Figure 23 LED Current vs. Input Voltage and Number of LED
LE
D
C
U
R
R
EN
T (
m
A)
3 LEDs 4 LEDs 5 LEDs
6 LEDs 7 LEDs 8 LEDs
T = 25°C
L = 33µH
R = 150m
R
= 36
R = 120
A
S
GI1
GI2
Ω
m
m
Ω
Ω
0
100
200
300
400
500
600
6.5 8.0 9.5 11.0 12.5 14.0 15.5 17.0
INPUT VOLTAGE (V)
Figure 24 Switching Frequency vs. Input Voltage and Number of LED
SW
IT
C
H
IN
G
F
R
E
Q
U
E
N
C
Y
(k
H
z)
T = 25 C
L = 33µH
R = 150m
R
= 36k
R = 120k
A
S
GI1
GI2
°
Ω
Ω
Ω
7 LEDs 8 LEDs 6 LEDs
5 LEDs 4 LEDs 3 LEDs
70%
75%
80%
85%
90%
95%
100%
6.5 8.0 9.5 11.0 12.5 14.0 15.5 17.0
EFF
ICI
ENC
Y
INPUT VOLTAGE (V)
Figure 25 Efficiency vs. Input Voltage and Number of LED
T = 25°C
L = 33µH
R = 150m
R
= 36K
R = 120k
A
S
GI1
GI2
Ω
Ω
Ω
3 LEDs 4 LEDs 5 LEDs 6 LEDs 7 LEDs 8 LEDs