Rainbow-electronics MAX8758 Manual de usuario descargar pdf (Pagina 8)

MAX8758

Step-Up Regulator with Switch Control and

Operational Amplifier for TFT LCD

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1, V

= 3.3V, V

MAIN

= 8.5V, FREQ = SHDN = IN, T

= +25°C, unless otherwise noted.)

OP-AMP LARGE-SIGNAL STEP RESPONSE

MAX8758 toc17

1µs/div

OUTB

2V/div

OP-AMP SMALL-SIGNAL STEP RESPONSE

MAX8758 toc18

200ns/div

POSB

100mV/div

AC-COUPLED

OUTB

200mV/div

AC-COUPLED

HIGH-VOLTAGE SWITCH CONTROL FUNCTION

(MODE 1)

MAX8758 toc19

400µs/div

MODE

CTL

GON

HIGH-VOLTAGE SWITCH CONTROL FUNCTION

(MODE 2)

MAX8758 toc20

400µs/div

MODE

CTL

GON

POSITIVE CHARGE-PUMP OUTPUT VOLTAGE

vs. CHARGE-PUMP LOAD CURRENT

MAX8758 toc21

CHARGE-PUMP LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

15105

020

= 3.3V

OSC

= 1.2MHz

-9

-8

-7

-6

-5

-10

NEGATIVE CHARGE-PUMP OUTPUT VOLTAGE

vs. LOAD CURRENT

MAX8758 toc22

CHARGE-PUMP LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

15105020

= 3.3V

OSC

= 1.2MHz

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 19 20

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Rainbow-electronics MAX8758 Manual de usuario Pagina 8

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