MAX5071CASA datasheet(9/22 Pages) MAXIM

Part #	MAX5071CASA

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

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Manufacturer	MAXIM [Maxim Integrated Products]

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High-Performance, Single-Ended, Current-Mode

PWM Controllers

_______________________________________________________________________________________

9

OUT SOURCE AND SINK CURRENTS

MAX5070 toc20

VCC = 15V

IOUT

2A/div

VOUT

10V/div

20Ons/div

COUT = 10nF

2

4

3

5

8

9

7

6

10

20

220 320 420 520

120

620 720 820 920 1020

SUPPLY CURRENT (ICC)

vs. OSCILLATOR FREQUENCY (CT = 100pF)

FREQUENCY (kHz)

TA = +125°C

TA = +85°C

TA = +25°C

TA = -40°C

MAX5070A/MAX5071A

MAXIMUM DUTY CYCLE vs. RT

RT (Ω)

10k

1k

30

40

50

60

70

80

90

100

20

100

100k

CT = 1nF

CT = 560pF

CT = 220pF

CT = 100pF

Typical Operating Characteristics (continued)

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

Pin Descriptions

NAME

FUNCTION

1

COMP

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

2

FB

Error-Amplifier Inverting Input

3CS

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

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

4RT/CT

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

RT/CT to GND set the oscillator frequency.

5

GND

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

ground loops.

6

OUT

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

7VCC

Power-Supply Input for MAX5070. Bypass VCC to GND with a 0.1µF ceramic capacitor or a parallel

combination of a 0.1µF and a higher value ceramic capacitor.

8

VREF

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

of a 0.1µF and a higher value ceramic capacitor.

MAX5070A/MAX5070B

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