Rainbow-electronics MAX8759 Bedienungsanleitung PDF herunterladen (Seite 14)

MAX8759

Low-Cost, SMBus, CCFL Backlight Controller

14 ______________________________________________________________________________________

Figure 2. MAX8759 Functional Diagram

MAX8759

LINEAR

REGULATOR

BIAS

4.3V

RDY

SMBus

DWPM

OSC

ALS

ADC

BRIGHTNESS

CONTROL

8-BIT

COUNTER

PWM

ADC

40kΩ

BATT

VALS

ISEC

SCL

FREQ

SDA

ALS

PWMI

PWMO

DPWM

LATCH

DPWM

COMP

UVLO

COMPARATOR

BATT

GND

MAX

COMP

1.21V

OPEN-LAMP

COMP

600mV

135µA

1µA

2.3V

VFB

COMP

IFB1

IFB2

1000µA 100µA

RDY

ERROR

AMP

REF

MUX

LX_

ILIM

COMP

400mV

PWM

COMP

BST1

GH1

LX1

BST2

GH2

LX2

VDD

GL1

PGND2

GL2

GATE-DRIVER

CONTROL

STATE

MACHINE

TON FF

MIN

TON

ZERO-CROSS

DETECTIONS

AND

DELAY BLOCK

PGND1

DEL

SHUTDOWN

FAULT

LATCH

230mV

VFB

COMP

TFLT

MIN

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 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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