Rainbow-electronics MAX8709 Manual do Utilizador descarregar pdf (Página 6)

LAMP-OUT VOLTAGE

LIMITING AND TIMEOUT

MAX8709 toc09

A: V

VFB

, 1V/div

B: V

IFB

, 1V/div

200ms/div

MAX8709

High-Efficiency CCFL Backlight

Controller with SMBus Interface

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1. V

BATT

= 12V, V

LOT

= V

REF

, V

= V

DD,

SUS

= 5.3V, T

= +25°C, unless otherwise noted.)

STARTUP

MAX8709 toc04

A: V

SUS

, 5V/div

B: V

IFB

, 2V/div

C: V

VFB

, 2V/div

D: V

LX1

, 10V/div

2ms/div

DPWM OPERATION (10%)

MAX8709 toc05

A: V

CCV

, 200mV/div

B: V

IFB

, 1V/div

C: V

VFB

, 1V/div

1ms/div

1.2V

DPWM OPERATION (50%)

MAX8709 toc06

A: V

CCV

, 200mV/div

B: V

IFB

, 1V/div

C: V

VFB

, 1V/div

1ms/div

1.2V

DPWM SOFT-START

MAX8709 toc07

A: V

IFB

, 1V/div

B: V

VFB

, 1V/div

40µs/div

1.2V

CCI

CCV

DPWM SOFT-STOP

MAX8709 toc08

A: V

IFB

, 1V/div

B: V

VFB

, 1V/div

40µs/div

CCI

CCV

1 2 3 4 5 6 7 8 9 10 11 ... 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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