Rainbow-electronics MAX781 Manual do Utilizador descarregar pdf (Página 7)

MAX781

PDA/Hand-Held Computer Power Controller

_______________________________________________________________________________________

1 10 100 1000

3OUT OPERATE MODE POWER EFFICIENCY

VARIABLE SWITCHING FREQUENCY

MAX781-09

3OUT OUTPUT CURRENT (mA)

POWER EFFICIENCY (%)

100

BATT = 7.5V

SYNC = AGND

IDLE = 1

MODE1 = 1

MODE0 = 0

100

150

200

250

300

350

400

450

SWITCHING EFFICIENCY (kHz)

kHz

USING THE BATTERY CHARGER TO DRIVE

A CCFL BACKLIGHT ROYER OSCILLATOR

MAX781-01

CHG6–CHG0 BITS VALUE

CCFL TUBE CURRENT (mA, rms)

CSBAT AVERAGE VOLTAGE (mV)

100

110

10 20 30 40 50 60 70

0.5

1.0

1.5

2.0

2.5

SYNC = REF

VCHG = 7V

BATT = VCHG - DIODE DROP

R4 = 0.47Ω

mA, rms

____________________________Typical Operating Characteristics (continued)

= +25°C, unless otherwise noted.)

______________________________________________________________Pin Description

21 DLO +3.3V Regulator, Synchronous Rectifier, Gate-Driver Output

22 BST +3.3V Regulator Boost Capacitor Connection (0.1µF to LX)

23 DHI +3.3V Regulator High-Side Gate-Driver Output

24 LX +3.3V Regulator Inductor Connection

20 PGND Power Ground

12 DOUT Serial-Interface Data Output

13 DIN Serial-Interface Data Input

16 COMP Battery-Charger Compensation

NAME FUNCTION

1–4 GD2–GD5 High-Side Gate-Driver Outputs

5 VPPA VPP-Programming Voltage Output A

17 CSBAT Battery-Charger Current-Sense Input

18 5OUT Linear-Regulated +5V Output

19 DCHG Battery-Charger MOSFET Gate-Driver Output

14 INT Interrupt Output

15 FAST General-purpose open-drain output

8 AGND Analog Ground

9 SYNC Oscillator Frequency Control and Synchronization Input

10 CE Serial-Interface Chip-Enable Input—active high

11 SCLK Serial-Interface Clock Input

6 VHI VPPA, VPPB Linear-Regulator Input Power

7 VPPB VPP-Programming Voltage Output B

1 2 3 4 5 6 7 8 9 10 11 12 ... 23 24

Comentários a estes Manuais

Sem comentários

Rainbow-electronics MAX781 Manual do Utilizador Página 7

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics MAX781