Typical characteristics, Zxld1374, A product line of diodes incorporated – Diodes ZXLD1374 User Manual
Page 8
ZXLD1374
Document number: DS35032 Rev. 3 - 2
8 of 39
September 2012
© Diodes Incorporated
ZXLD1374
A Product Line of
Diodes Incorporated
Typical Characteristics
0
0.5
1
1.5
2
2.5
3
6
12
18
24
30
36
42
48
54
60
SUPPLY VOLTAGE (V)
Figure 1 Supply Current vs. Supply Voltage
S
U
PPL
Y
C
U
R
R
EN
Tt
(
m
A
)
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
C
H
ING F
R
EQUE
N
C
Y
(k
H
z)
LE
D
CUR
R
ENT (
m
A
)
ADJ VOLTAGE (V)
Figure 2 Buck LED Current, Switching Frequency vs. V
ADJ
I
LED
Switching
Frequency
T = 25°C
V
= V = 12V
2LEDs
L = 33 H
R = 300m
A
AUX
IN
S
µ
Ω
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
RE
QUENCY
(k
Hz
)
ADJ VOLTAGE
Figure 3 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 4 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
250
500
750
1000
1250
1500
0
10
20
30
40 50
60
70 80
90 100
PWM DUTY CYCLE (%)
Figure 5 I
vs. PWM Duty Cycle
LED
LE
D
CURRENT
(
m
A
)
Figure 6 I
LED
vs. Time - PWM Pin Transient Response