MAX5021 datasheet(3/11 Pages) MAXIM

No. de pieza	MAX5021

Descripción Electrónicos	Current-Mode PWM Controllers for Isolated Power Supplies

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Fabricante Electrónico	MAXIM [Maxim Integrated Products]

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Current-Mode PWM Controllers for Isolated

Power Supplies

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +11V to +28V, VCS = 0, OPTO is unconnected, 10nF bypass capacitors at VIN and VCC, NDRV unconnected, TA = -40°C to

+85°C, unless otherwise noted. Typical values are at VIN = +12V, TA = +25°C, unless otherwise noted.) (Note 1)

Note 1: All devices are 100% tested at TA = +25°C. All limits over temperature are guaranteed by characterization.

Note 2: This minimum current after startup is a safeguard that prevents the VIN pin voltage from rising in the event

that OPTO and NDRV become unconnected.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

OSCILLATOR

Switching Frequency

fSW

230

262

290

kHz

MAX5021

50

51

Maximum Duty Cycle

DMAX

MAX5022

75

76

%

OPTO INPUT

OPTO Pullup Voltage

VOPTO

OPTO sourcing 10µA

5.5

V

OPTO Pullup Resistance

ROPTO

4.5

6.2

7.9

k

Ω

Typical Operating Characteristics

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

23.9

24.0

24.1

24.2

24.3

UNDERVOLTAGE LOCKOUT

vs. TEMPERATURE

TEMPERATURE (

°C)

-40

20

40

-20

0

60

80

VIN RISING

9.8

9.9

10.0

10.1

10.2

UNDERVOLTAGE LOCKOUT

vs. TEMPERATURE

TEMPERATURE (

°C)

-40

20

40

-20

0

60

80

VIN FALLING

47

48

49

50

51

52

53

-40

-20

0

20

40

60

80

STARTUP CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

VIN = 23.0V

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