MAX17497A Просмотр технического описания (PDF) - Maxim Integrated

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MAX17497A

AC-DC and DC-DC Peak Current-Mode Converters with Integrated Step-Down Regulator

Maxim Integrated 

MAX17497A/MAX17497B

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

with Integrated Step-Down Regulator

ELECTRICAL CHARACTERISTICS (continued)

(VIN = +15V, VEN/UVLO = +2V, COMPF = open, CIN = 1FF, CVCC = 1FF, TA = TJ = -40NC to +125NC, unless otherwise noted. Typical

values are at TA = +25NC.) (Note 1)

PARAMETER

RESETN Higher Thresholds

RESETN Lower Thresholds

EAFN rising

OUTB rising

EAFN falling

OUTB falling

CONDITIONS

MIN

TYP

MAX UNITS

93.5

95

96.5

%

93.5

95

96.5

90.5

92

93.5

%

90.5

92

93.5

RESETN Delay After EAFN and

VOUTB Reach 95% Regulation

(MAX17497A/MAX17497B)

4

ms

THERMAL SHUTDOWN

Thermal Shutdown Threshold

Thermal Shutdown Hysteresis

Temperature rising

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 MAX17497A is intended for use in universal input power supplies. The internal clamp circuit at IN is used to prevent

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

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

Note 3: Guarantees cross conduction is avoided and it is not larger than specified max value to guarantee loop-regulation capability.

Typical Operating Characteristics

(VIN = +15V, VEN/UVLO = +2V, COMPF = open, CIN = 1FF, CVCC = 1FF, TA = TJ = -40NC to +125NC, unless otherwise noted. Typical

values are at TA = +25NC.)

BOOTSTRAP UVLO WAKE-UP LEVEL

vs. TEMPERATURE (MAX17497A)

20.26

MAX17497A/B toc01

IN UVLO WAKE-UP LEVEL

vs. TEMPERATURE (MAX17497B)

4.15

MAX17497A/B toc02

IN UVLO SHUTDOWN LEVEL vs. TEMPERATURE

(MAX17497A /MAX17497B)

4.015

MAX17497A/B toc03

4.010

20.24

4.10

4.005

20.22

4.05

4.000

20.20

3.995

4.00

3.990

20.18

3.985

20.16

3.95

3.980

20.14

-40 -20

0 20 40 60 80 100 120

TEMPERATURE (°C)

3.90

-40 -20

0 20 40 60 80 100 120

TEMPERATURE (°C)

3.975

-40 -20

0 20 40 60 80 100 120

TEMPERATURE (°C)

Maxim Integrated

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