Rainbow-electronics MAX1531 Manual do Utilizador descarregar pdf (Página 7)

MAX1530/MAX1531

Multiple-Output Power-Supply Controllers for

LCD Monitors

_______________________________________________________________________________________ 7

Typical Operating Characteristics

(Circuit of Figure 1; including R5, R6, and D2; T

= +25°C, unless otherwise noted.)

STEP-DOWN EFFICIENCY vs. LOAD CURRENT

MAX1530 toc01

LOAD CURRENT (mA)

EFFICIENCY (%)

1200900600300

100

0 1500

= 12V

= 20V

= 500kHz

STEP-DOWN LOAD REGULATION

MAX1530 toc02

LOAD CURRENT (mA)

OUTPUT-VOLTAGE ERROR (%)

1200900600300

-0.12

-0.08

-0.04

-0.16

0 1500

SWITCHING FREQUENCY vs. LOAD CURRENT

FREQUENCY (kHz)

485

490

495

500

510

505

515

520

480

MAX1530 toc03

LOAD CURRENT (mA)

12009006003000 1500

STEP-DOWN REGULATOR LOAD TRANSIENT

MAX1530 toc04

s/div

A: LOAD CURRENT, 1A/div

B: OUTPUT VOLTAGE, 200mV/div, AC-COUPLED

C: INDUCTOR CURRENT, 1A/div

3.3V

STEP-DOWN REGULATOR

SWITCHING WAVEFORM

MAX1530 toc05

s/div

A: LX, 10V/div

B: OUTPUT VOLTAGE, 20 mV/div, AC-COUPLED

C: INDUCTOR CURRENT, 1A/div

3.3V

STEP-DOWN REGULATOR

SOFT-START

MAX1530 toc06

1ms/div

A: EN, 2V/div

B: OUTPUT VOLTAGE, 2V/div

C: INDUCTOR CURRENT, 1A/div

VL LOAD REGULATION

MAX1530 toc07

LOAD CURRENT (mA)

VL OUTPUT ERROR (%)

252015105

-0.4

-0.3

-0.2

-0.1

-0.5

030

STARTUP SEQUENCE

MAX1530 toc08

4ms/div

A: V

, 10V/div

B: V

OUT

, 5V/div

C: V

LOGIC

, 5V/div

D: V

SOURCE

, 20V/div

E: V

GAMMA

, 20V/div

F: V

GOFF

, 20V/div

G: V

GON

, 40V/div

LR1 BASE CURRENT

vs. DRV1 VOLTAGE

MAX1530 toc09

DRV1 VOLTAGE (V)

BASE CURRENT (mA)

8642

010

FBL1

= 1.175V

1 2 3 4 5 6 7 8 9 10 11 12 ... 32 33

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