Rainbow-electronics MAX1685 Bedienungsanleitung PDF herunterladen (Seite 6)

MAX1684/MAX1685

Low-Noise, 14V Input, 1A, PWM

Step-Down Converters

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(Circuit of Figure 1, T

= +25°C, unless otherwise noted.)

1.0

1.2

1.1

1.4

1.3

1.7

1.6

1.5

1.8

04268101214

MAXIMUM LOAD CURRENT

vs. INPUT VOLTAGE

MAX1684/85 toc10

INPUT VOLTAGE (V)

LOAD CURRENT (A)

PWM OR NORMAL MODE

200

600

400

1000

1200

800

1400

062 8 10 12 14 16

SAFE OPERATING AREA

MAX1684/85 toc11

INPUT VOLTAGE (V)

LOAD CURRENT (mA)

OUT

= 3.3V

100

300

200

400

0 200 400 600 800 1000

DROPOUT VOLTAGE vs. LOAD CURRENT

MAX1684/85 toc12

LOAD CURRENT (mA)

DROPOUT VOLTAGE (mV)

OUT

= 3.3V

OUT

= 5V

INDUCTOR RESISTANCE INCLUDED

100

120

486101214

NO-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE

MAX1684/85 toc13

INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

NORMAL MODE

LOW-POWER MODE

LOAD

500mA/div

OUT

50mV/div

2ms/div

LOAD-TRANSIENT RESPONSE

MAX1684/85 toc16

MAX1684, I

LOAD

= 0.1mA TO 1A, V

OUT

= 3.3V, V

= 5V,

SYNC/PWM = 3.3V

2.0

2.5

3.0

3.5

4.0

4.5

5.0

465 7 8 9 10 11 12

MAX1684

NO-LOAD SUPPLY CURRENT

vs. INPUT VOLTAGE

OUT

= 3.3V, PWM MODE)

MAX1684/85 toc14

INPUT VOLTAGE (V)

SUPPLY CURRENT (mA)

2.7

02468101214

PWM FIXED-FREQUENCY

OPERATION AREA

M AX1684/85 toc15

OUTPUT VOLTAGE (V)

INPUT VOLTAGE (V)

MAX1685

MAX1684

OUT

20mV/div

100mA/div

1µs/div

SWITCHING WAVEFORM

MAX1684/85 toc17

MAX1684, I

LOAD

= 100mA, V

OUT

= 3.3V, V

= 5V,

SYNC/PWM = 3.3V

5V/div

100mA/div

1µs/div

SWITCHING WAVEFORM

MAX1684/85 toc18

MAX1684, I

LOAD

= 100mA, V

OUT

= 3.3V, V

= 5V,

SYNC/PWM = 3.3V

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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