High-Performance, Single-Ended, Current-Mode

PWM Controllers

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9

Typical Operating Characteristics (continued)

Pin Descriptions

PIN

NAME

FUNCTION

1

COMP

Error-Amplifier Output. COMP can be used for soft-start.

2

FB

Error-Amplifier Inverting Input

3CS

PWM Comparator and Overcurrent Protection Comparator Input. The current-sense signal is

compared to a signal proportional to the error-amplifier output voltage.

to GND set the oscillator frequency.

5

GND

loops.

6

OUT

MOSFET Driver Output. OUT connects to the gate of the external n-channel MOSFET.

a 0.1µF and a higher value ceramic capacitor.

8

REF

5V Reference Output. Bypass REF to GND with a 0.1µF ceramic capacitor or a parallel combination

of a 0.1µF and a higher value ceramic capacitor no larger then 4.7µF.

MAX5094_

t = 400ns/div

OUT SOURCE AND SINK CURRENTS

4A/div

10V/div

MAX5094/95 toc20

2.0

3.0

2.5

4.0

3.5

5.0

4.5

5.5

6.5

6.0

7.0

20

220 320 420

120

520 620 720

920

820

1020

SUPPLY CURRENT

vs. OSCILLATOR FREQUENCY

FREQUENCY (kHz)

°C

MAX5095C

°C

MAXIMUM DUTY CYCLE

Ω)

10,000

1000

30

40

50

60

70

80

90

100

20

100

100,000