Rainbow Electronics MAX8759 - Manual (Page 7)

MAX8759
Low-Cost, SMBus, CCFL Backlight Controller
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C
D
B
A
A: VFB, 2V/div
B: LX1, 10V/div
LOW-INPUT VOLTAGE OPERATION
(V
IN
= 8.0V)
MAX8759 toc01
10 µs/div
C: LX2, 10V/div
D:IFB, 2V/div
C
D
B
A
A: VFB, 2V/div
B: LX1, 20V/div
HIGH-INPUT VOLTAGE OPERATION
(V IN = 20.0V)
MAX8759 toc02
10 µs/div
C: LX2, 20V/div
D: IFB, 2V/div
C
D
B
A
A: V IN , 10V/div
B: COMP, 2V/div
LINE TRANSIENT RESPONSE
(8V TO 20V)
MAX8759 toc03
100 µs/div
C: IFB, 2V/div
D: LX1, 20V/div
C
D
B
A
A: V IN , 10V/div
B: COMP, 2V/div
LINE TRANSIENT RESPONSE
(20V TO 8V)
MAX8759 toc04
100 µs/div
C: IFB, 2V/div
D: LX1, 20V/div
C
B
A
A: VFB, 2V/div
B: COMP, 1V/div
MINIMUM BRIGHTNESS STARTUP WAVEFORM
(SMBus MODE, BRIGHTNESS REGISTER = 0x00)
MAX8759 toc05
2ms/div
C: IFB, 2V/div
C
B
A
A: VFB, 2V/div
B: COMP, 1V/div
MINIMUM BRIGHTNESS DPWM OPERATION
(SMBus MODE, BRIGHTNESS REGISTER = 0x00)
MAX8759 toc06
2ms/div
C: IFB, 2V/div
C
B
A
A: VFB, 2V/div
B: COMP, 1V/div
50% BRIGHTNESS DPWM OPERATION
(SMBus MODE, BRIGHTNESS REGISTER = 0x80)
MAX8759 toc07
2ms/div
C: IFB, 2V/div
C
B
A
A: VFB, 2V/div
B: COMP, 1V/div
DPWM SOFT-START
MAX8759 toc08
40 µs/div
C: IFB, 2V/div
C
B
A
A: VFB, 2V/div
B: COMP, 1V/div
DPWM SOFT-STOP
MAX8759 toc09
40 µs/div
C: IFB, 2V/div
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= 12V, V
CC
= V
DD
, T
A
= +25 °C, unless otherwise noted.)