Rainbow-electronics MAX781 Manual do Utilizador descarregar pdf (Página 20)

MAX781

PDA/Hand-Held Computer Power Controller

20 ______________________________________________________________________________________

MAX781

BATT

VCHG

COMP

CM = CENTRAL SEMICONDUCTOR

NOTE: SEE TABLE 10 FOR COMPONENT SUPPLIER INFORMATION.

CT = COILTRONICS

MK = WILHELM WESTERMANN

FM = ZETEX

DCHG

AGND

CSBAT

0.33µF

0.1µF

CMPD4448

10k

Si9953DY

M1 DRAIN

EC10QS02L

CMPT3904

22µF

20V

10k

CMPZ5240B

CMPD4448

CTX150-4

CCFL

15pF 2kV

FMMT619

MKS01-SMD

FMMT619

2345

CTX110606

710Ω

0.47Ω

CCFL

0.1µF

EQ = NIHON INTER ELECTRIC CORP.

Figure 10. Digitally Adjustable CCFL Backlight Circuit

1 2 ... 15 16 17 18 19 20 21 22 23 24

EVALUATION KIT 1
AVAILABLE 1
ABSOLUTE MAXIMUM RATINGS 2
ELECTRICAL CHARACTERISTICS 2
ANALOG MULTIPLEXER 4
NO LOAD SUPPLY CURRENT 5
CHARGER OUTPUT CURRENT 5
SYNC = AGND, NO 3OUT LOAD 6
T1 TURNS RATIO (SECONDARY 6
TURNS / PRIMARY TURNS) = 3.5 6
VARIABLE SWITCHING FREQUENCY 7
Table 2. Operating Modes 10
• • • 12
Supply and Reference 13
3.3V Output 13
VPP Regulator 14
Analog Multiplexer 15
Gate Drivers 15
Battery Charger 15
Design Example 17
Specifications 18
Table 10. Component Suppliers 19
Interfacing the MAX781 to an 21
IBM Compatible PC 21
TOP VIEW 23
21-0032A 24

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