Typical operating characteristics (continued) – Rainbow Electronics MAX8709 User Manual
Page 7
MAX8709
High-Efficiency CCFL Backlight
Controller with SMBus Interface
_______________________________________________________________________________________
7
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX8709 toc10
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
22
19
16
13
10
50
54
58
62
46
7
25
DPWM FREQUENCY
vs. INPUT VOLTAGE
MAX8709 toc11
INPUT VOLTAGE (V)
DPWM FREQUENCY (Hz)
22
19
16
13
10
205
210
215
220
200
7
25
ELECTRICAL EFFICIENCY
vs. INPUT VOLTAGE
MAX8709 toc12
INPUT VOLTAGE (V)
ELECTRICAL EFFICIENCY (%)
22
19
16
13
10
60
70
80
90
100
50
7
25
NORMALIZED RMS LAMP CURRENT
vs. INPUT VOLTAGE
MAX8709 toc13
INPUT VOLTAGE (V)
RMS LAMP-CURRENT ERROR (%)
22
19
10
13
16
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
-0.8
7
25
-0.15
-0.10
0
-0.05
0.05
0.10
0
40
20
60
80
100
REF LOAD REGULATION
MAX8709 toc14
REF LOAD CURRENT (µA)
REF VOLTAGE ERROR (%)
0
20
60
40
80
100
0
8
12
4
16
20
24
28
32
NORMALIZED BRIGHTNESS
vs. BRIGHTNESS CODE
MAX8709 toc15
BRIGHTNESS CODE
NORMALIZED BRIGHTNESS (%)
NORMALIZED V
CC
LINE REGULATION
MAX8709 toc16
INPUT VOLTAGE (V)
V
CC
VOLTAGE ERROR (%)
20
15
10
-0.8
-0.6
-0.4
-0.2
0
0.2
-1.0
5
25
V
CC
= 5.3V
V
CC
LOAD REGULATION
MAX8709 toc17
V
CC
VOLTAGE ERROR (%)
16
12
8
4
-1.2
-0.9
-0.6
-0.3
0
-1.5
0
20
EXTERNAL LOAD CURRENT (mA)
Typical Operating Characteristics (continued)
(Circuit of Figure 1. V
BATT
= 12V, V
LOT
= V
REF
, V
CC
= V
DD,
V
SUS
= 5.3V, T
A
= +25°C, unless otherwise noted.)
REF OUTPUT vs. TEMPERATURE
MAX8709 toc18
TEMPERATURE (°C)
REF VOLTAGE ERROR (%)
80
60
40
20
0
-20
-0.20
-0.15
-0.10
-0.05
0
0.05
-0.25
-40
100