MAX8729EEI+T Maxim Integrated Products, MAX8729EEI+T Datasheet - Page 7

• Manufacturer Part Number: MAX8729EEI+T
• Description: Display Drivers Constant-Frequency H alf-Bridge CCFL Inve
• Manufacturer: Maxim Integrated Products

Specifications of MAX8729EEI+T

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(Circuit of Figure 1. V
Constant-Frequency, Half-Bridge CCFL Inverter
A: LX, 10V/div
B: IFB, 2V/div
C: VFB, 2V/div
A: IFB, 2V/div
B: VFB, 1V/div
C: COMP, 1V/div
A: COMP, 2V/div
B: VFB, 2V/div
C: TFLT, 5V/div
50% BRIGHTNESS DPWM OPERATION
LIMITING AND TIMEOUT
NORMAL OPERATION
LAMP-OUT VOLTAGE
1.17s
4ms/div
2ms/div
400ms/div
_______________________________________________________________________________________
IN
= 12V, V
MAX8729 toc01
MAX8729 toc04
MAX8729 toc07
CC
= V
DD,
B
A
C
A
C
B
C
A
B
T
A
= +25°C, unless otherwise noted.)
MINIMUM BRIGHTNESS STARTUP WAVEFORM
A: IFB, 2V/div
B: VFB, 1V/div
C: COMP, 1V/div
A: ISEC, 1V/div
B: COMP, 2V/div
C: TFLT, 5V/div
A: COMP, 1V/div
B: IFB, 2V/div
C: VFB, 2V/div
SECONDARY SHORT-CIRCUIT
PROTECTION AND TIMEOUT
DPWM SOFT-START
100ms/div
1ms/div
10ms/div
25.4ms
Typical Operating Characteristics
MAX8729 toc05
MAX8729 toc08
MAX8729 toc02
A
A
B
C
C
B
A
C
75
70
65
60
55
50
45
40
MINIMUM BRIGHTNESS DPWM OPERATION
75
A: IFB, 2V/div
B: VFB, 1V/div
C: COMP, 1V/div
A: IFB, 2V/div
B: VFB, 1V/div
C: COMP, 1V/div
SWITCHING FREQUENCY vs. R
85
DPWM SOFT-STOP
Controller
95
2ms/div
100ms/div
R
HF
105
(kΩ)
115
MAX8729 toc03
MAX8729 toc06
125
HF
135
A
B
C
A
B
C
7