MAX17498A(2012) Просмотр технического описания (PDF) - Maxim Integrated

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MAX17498A
(Rev.:2012)

AC-DC and DC-DC Peak Current-Mode Converters for Flyback/Boost Applications

Maxim Integrated 

MAX17498A / MAX17498B / MAX17498C

AC-DC and DC-DC Peak Current-Mode Converters

for Flyback/Boost Applications

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +15V, VEN/UVLO = +2V, COMP = open, CIN = 1µF, CVCC = 1µF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical

values are at TA = +25°C.) (Note 1)

PARAMETER

OVERVOLTAGE PROTECTION (OVI)

OVI Threshold

Rising

Falling

OVI Masking Delay

CONDITIONS

OVI Input Leakage Current

0V < VOVI < 1.5V, TA = +25NC

SWITCHING FREQUENCY AND MAXIMUM DUTY CYCLE (fSW and DMAX)

Switching Frequency

MAX17498A/MAX17498C

MAX17498B

Maximum Duty Cycle

MAX17498A/MAX17498C

MAX17498B

Minimum Controllable On Time

SOFT-START (SS)

SS Set-Point Voltage

tONMIN

SS Pullup Current

SS Peak Current-Limit-Enable

Threshold

VSS = 400mV

ERROR AMPLIFIER (EA+, EA-, and COMP)

EA+ Input Bias Current

EA- Input Bias Current

Error-Amplifier Open-Loop

Voltage Gain

VEA+ = 1.5V, TA = +25NC

VEA- = 1.5V, TA = +25NC

Error-Amplifier

Transconductance

VCOMP = 2V, VLIM = 1V

Error-Amplifier Source Current

Error-Amplifier Sink Current

Current-Sense Transresistance

INTERNAL SWITCH

VCOMP = 2V, EA- < EA+

VCOMP = 2V, EA- > EA+

DMOS Switch On-Resistance

(RDSON)

DMOS Peak Current Limit

DMOS Runaway Current Limit

ILX = 200mA

LIM = 100K

LIM = 100K

LX Leakage Current

CURRENT LIMIT (LIM)

VLX = 65V, TA = +25NC

LIM Reference Current

Peak Switch Current Limit with

LIM Open

Runaway Switch Current Limit

with LIM Open

MIN TYP MAX UNITS

1.18 1.23 1.28

V

1.11 1.17 1.21

2

µs

-100

0

+100

nA

235 250 265

kHz

470 500 530

47.5 48.75 50

%

90

92

94

110

ns

1.2 1.22 1.24

V

9

10

11

µA

1.11 1.17 1.21

V

-100

-100

+100

nA

+100

nA

90

dB

1.5

1.8

2.1

mS

80

120 210

µA

80

120 210

µA

0.45 0.5 0.55

I

175 380

mI

1.62 1.9 2.23

A

1.9

2.3

2.6

A

0.1

1

µA

9

10

11

µA

0.39 0.45 0.54

A

0.39 0.5

0.6

A

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