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

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производитель

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

Number of Peak Current-Limit

Hits Before Hiccup Timeout

CONDITIONS

MIN TYP MAX UNITS

8

#

Number of Runaway Current-

Limit Hits Before Hiccup Timeout

Overcurrent Hiccup Timeout

SLOPE COMPENSATION (SLOPE)

SLOPE Pullup Current

SLOPE-Compensation Resistor

Range

MAX17498B

1

#

32

ms

9

10

11

µA

30

150

kI

Default SLOPE-Compensation

Ramp

SLOPE = open

POWER-GOOD SIGNAL (PGOOD)

PGOOD Output-Leakage

Current (Off State)

VPGOOD = 5V, TA = +25NC

60

mV/µs

-1

+1

µA

PGOOD Output Voltage

(On State)

PGOOD Higher Threshold

PGOOD Lower Threshold

PGOOD Delay After

EA- Reaches 95% Regulation

THERMAL SHUTDOWN

Thermal-Shutdown Threshold

Thermal-Shutdown Hysteresis

IPGOOD = 10mA

EA- rising

EA- falling

Temperature rising

0

0.4

V

93.5 95 96.5

%

90.5 92 93.5

%

4

ms

+160

NC

20

NC

Note 1: All devices are 100% production tested at TA = +25NC. Limits over temperature are guaranteed by design.

Note 2: The MAX17498A is intended for use in universal input power supplies. The internal clamp circuit at IN is used to prevent the

bootstrap capacitor from changing to a voltage beyond the absolute maximum rating of the device when EN/UVLO is low

(shutdown mode). Externally limit the maximum current to IN (hence to clamp) to 2mA (max) when EN/UVLO is low.

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