Rainbow-electronics MAX8759 Manual de usuario descargar pdf (Pagina 29)

MAX8759

Low-Cost, SMBus, CCFL Backlight Controller

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N2A

0.1µF

1µF

22µF

25V

C10

0.1µF

C11

0.1µF

C13

6.8nF

10pF

3kV

150Ω

R14

100kΩ

R15

100kΩ

150kΩ

390kΩ

180kΩ

R10

20kΩ

R12

180kΩ

R13

20kΩ

C17

1nF

10pF

3kV

2.2µF

1:110

C14

0.22µF

FDS6990A

0.47µF

C12

1µF

C15

0.1µF

169kΩ

BATT

GND

DEL

SDA

SCL

PWMI

PWMO

FREQ

VALS

ALS

PGND1

BST2

BST1

GH1

LX1

LX2

GL1

PGND2

GL2

GH2

IFB1

IFB2

ISEC

VFB

COMP

TFLT

N2B

N1A N1B

PWM INPUT

INPUT VOLTAGE

SMB_DATA

SMB_CLOCK

ALS SUPPLY

ALS OUTPUT

7.5V TO 21V

MAX8759

Figure 11. Typical MAX8758 Dual-Lamp Operating Circuit

1 2 ... 24 25 26 27 28 29 30 31

General Description 1
Applications 1
Features 1
Ordering Information 1
Minimal Operating Circuit 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
Pin Description 10
Pin Description (continued) 11
Typical Operating Circuit 13
Detailed Description 13
Lamp-Current Regulation 16
Feed-Forward Control 17
Lamp Startup 17
Dimming Control 18
SMBus with DPST Mode 18
Fault Protections 19
Linear Regulator Output (V 19
POR and UVLO 19
Low-Power Shutdown 20
SMBus Interface (SDA, SCL) 20
SMBus Register Definitions 21
Table 3. Commands Description 22
Control Register Bits 5, 4 24
Applications Information 26
Component Selection 27
COMP Capacitor Selection 28
Setting the Fault-Delay Time 28
Bootstrap Capacitors 28
Dual-Lamp Operating Circuit 28
Layout Guidelines 28
Chip Information 30
Pin Configuration 30
Package Information 31

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Rainbow-electronics MAX8759 Manual de usuario Pagina 29

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