MAX5094A Просмотр технического описания (PDF) - Maxim Integrated

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Компоненты Описание

производитель

MAX5094A

High-Performance, Single-Ended, Current-Mode PWM Controllers

Maxim Integrated 

High-Performance, Single-Ended, Current-Mode

PWM Controllers

Typical Operating Characteristics (continued)

(VCC = 15V, TA = +25°C, unless otherwise noted.)

OUT SOURCE AND SINK CURRENTS

MAX5094/95 toc20

VCC = 15V

COUT = 10nF

VOUT

10V/div

t = 400ns/div

IOUT

4A/div

SUPPLY CURRENT

vs. OSCILLATOR FREQUENCY

7.0

6.5 MAX5095C

CT = 100pF

6.0

5.5

5.0

TA = +125°C

4.5

TA = -40°C

4.0

3.5

3.0

2.5

2.0

20 120 220 320 420 520 620 720 820 920 1020

FREQUENCY (kHz)

MAXIMUM DUTY CYCLE

vs. RT MAX5094A/MAX5095A

100

90

80

CT = 1000pF

CT = 560pF

70

60

CT = 220pF

50

40

CT = 100nF

30

20

100

1000

10,000

RT (Ω)

100,000

MAX5094_

PIN

NAME

1

COMP

2

FB

3

CS

4

RT/CT

5

GND

6

OUT

7

VCC

8

REF

Pin Descriptions

FUNCTION

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

Error-Amplifier Inverting Input

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

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

Timing Resistor/Capacitor Connection. A resistor RT from RT/CT to REF and capacitor CT from RT/CT

to GND set the oscillator frequency.

Power-Supply Ground. Place the VCC and REF bypass capacitors close to the IC to minimize ground

loops.

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

Power-Supply Input. Bypass VCC to GND with a 0.1µF ceramic capacitor or a parallel combination of

a 0.1µF and a higher value ceramic capacitor.

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.

_______________________________________________________________________________________ 9

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