Rainbow-electronics MAX5071 Manual de usuario descargar pdf (Pagina 2)

MAX5070/MAX5071

High-Performance, Single-Ended, Current-Mode

PWM Controllers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= +15V, R

= 10kΩ, C

= 3.3nF, V

VREF

= OPEN, C

VREF

= 0.1µF, COMP = OPEN, V

= 2V, CS = GND, T

= -40°C to +85°C,

unless otherwise noted.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

(Low-Impedance Source) to GND..................-0.3V to +30V

< 30mA).....................................................Self Limiting

OUT to GND...............................................-0.3V to (V

+ 0.3V)

OUT Current.............................................................±1A for 10µs

FB, SYNC, COMP, CS, R

, VREF to GND...........-0.3V to +6V

COMP Sink Current (MAX5070)..........................................10mA

Continuous Power Dissipation (T

= +70°C)

8-Pin µMAX (derate 4.5mW/°C above +70°C).............362mW

8-Pin SO (derate 5.9mW/°C above +70°C)...............470.6mW

Operating Temperature Range (Automotive)....-40°C to +125°C

Maximum Junction Temperature .....................................+150°C

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10s).................................+300°C

PARAMETER SYMBOL CONDITIONS

MIN

TYP

MAX

UNITS

REFERENCE

Output Voltage V

VREF

= +25°C, I

VREF

= 1mA

4.950 5.000 5.050

Line Regulation ∆V

LINE

12V < V

< 25V, I

VREF

= 1mA 0.4 4 mV

Load Regulation ∆V

LOAD

1mA < I

VREF

< 20mA 6 25 mV

Total Output Variation V

REFT

1mA < I

VREF

< 20mA, 12V < V

< 25V 4.9 5.1 V

Reference Output-Noise Voltage

NOISE

10Hz < f < 10kHz, T

= +25°C 50 µV

Reference Output Short Circuit I

S_SC

VREF

0V -30

-100 -180

OSCILLATOR

Initial Accuracy T

= +25°C 51 54 57 kHz

Voltage Stability 12V < V

< 25V 0.2 0.5 %

Temp Stability -40°C < T

< +85°C 0.5 %

Voltage Ramp (

P-P

RAMP

1.7 V

Voltage Ramp Valley

RAMP_VALLEY

1.1 V

Discharge Current I

DIS

RT/CT

= 2V, T

= +25°C 7.9 8.3 8.7 mA

Frequency Range f

OSC

1000

kHz

ERROR AMPLIFIER (MAX5070A/MAX5070B)

FB Input Voltage V

FB shorted to COMP

2.465

2.5

2.535

FB Input Bias Current I

B(FB)

-0.01 -0.1

µA

Open-Loop Voltage Gain A

VOL

2V ≤ V

COMP

≤ 4V

100

Unity-Gain Bandwidth f

GBW

MHz

Power-Supply Rejection Ratio PSRR 12V ≤ V

≤ 25V (Note 2) 60 80 dB

COMP Sink Current I

SINK

= 2.7V, V

COMP

= 1.1V 2 6 mA

COMP Source Current I

SOURCE

= 2.3V, V

COMP

= 5V

-0.5 -1.2 -1.8

COMP Output High Voltage V

COMPH

= 2.3V, R

COMP

= 15kΩ to GND 5 5.8 V

COMP Output Low Voltage V

COMPL

= 2.7V, R

COMP

= 15kΩ to VREF 0.1 1.1 V

CURRENT-SENSE AMPLIFIER

Gain A

(Notes 3, 4)

2.85

3.26

V/V

MAX5070A/B (Note 3)

0.95

1.05

Maximum Current-Sense Signal V

CS_MAX

COMP

= 5V, MAX5071_

0.84 0.935 1.03

1 2 3 4 5 6 7 ... 21 22

MAX5070/MAX5071 1
PWM Controllers 1

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Rainbow-electronics MAX5071 Manual de usuario Pagina 2

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