Rainbow-electronics MAX8709 Uživatelský manuál stáhnout pdf (Strana 10)

MAX8709

High-Efficiency CCFL Backlight

Controller with SMBus Interface

10 ______________________________________________________________________________________

SMBus

INTERFACE

BRIGHTNESS

DAC

DPWM

OSC

RAMP

GENERATOR

PEAK

DETECTOR

SUPPLY

CONTROL

LOGIC

MUX

LAMP-OUT

COMP

GMV

GMI

CCV

CLAMP

PK_DET

CLAMP

IMIN

COMP

IMAX

COMP

LX1

LX2

0.5V

0.4V

6mV

400µA

SEC OC

COMP

PWM

COMP

DPWM

COMP

1.25V

MAX8709

SUS

SDA

SCL

LOT

REF

CCV

CCI

ILIM

REF

IFB

VFB

BATT

GND

BST1

GH1

LX1

BST2

GH2

LX2

GL1

GL2

PGND

ISEC

REF

VIN

CCFL

Figure 2. MAX8709 Functional Diagram

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 22 23

General Description 1
Applications 1
Features 1
Ordering Information 1
Minimal Operating Circuit 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
MAX8709 toc01 5
MAX8709 toc02 5
MAX8709 toc03 5
LAMP-OUT VOLTAGE 6
LIMITING AND TIMEOUT 6
DPWM OPERATION (10%) 6
Pin Description 8
Pin Description (continued) 9
Typical Operating Circuit 11
Detailed Description 11
Figure 3. Resonant Operation 12
(CCI, CCV) 13
Lamp Startup 14
Feed-Forward Control and 14
Dropout Operation 14
DPWM Dimming Control 14
DPWM SETTINGS 15
SMBus Interface (SDA, SCL) 16
Figure 8. SMBus Write Timing 17
Figure 9. SMBus Read Timing 17
Table 3. Commands Description 18
Applications Information 19
Component Selection 20
Table 7. CCFL Specifications 21
Chip Information 22
Pin Configuration 22
Package Information 23

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