Rainbow-electronics MAX5953D Instrukcja Użytkownika Pobierz pdf (Strona 3)

MAX5953A/MAX5953B/MAX5953C/MAX5953D

IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= (V+ - V

) = 48V, GATE = PGOOD = PGOOD = unconnected, GND = OUT, HVIN = V+, UVLO = V

, T

= 0°C to +125°C, unless

otherwise noted. Typical values are at T

= +25°C. All voltages are referenced to V

, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MAX5953A/MAX5953C 7.1

Default Power Turn-On/Off

Hysteresis Voltage

HYST

UVLO

MAX5953B/MAX5953D 4

External UVLO Programming

Range

IN,EX

MAX5953A/MAX5953C only (Note 7) 12 67 V

UVLO External Reference

Voltage

REF

UVLO

increasing

2.400 2.460 2.522

UVLO External Reference

Voltage Hysteresis

HYST

UVLO

Ratio to V

REF, UVLO

19.2

20.9

UVLO Bias Current I

IN,UVLO

UVLO

= 2.460V

-1.5 +1.5

µA

UVLO Input Ground-Sense

Threshold

UVLO

(Note 8) 50 440 mV

UVLO Input Ground-Sense Glitch

Rejection

7µs

Power Turn-Off Voltage,

Undervoltage Lockout Deglitch

Time

OFF_DLY

, V

UVLO

falling (Note 9)

0.32

Isolation Switch n-Channel

MOSFET On-Resistance

ON,ISO

Output current = 300mA, V

GATE

= 5.6V,

measured between OUT and V

0.6 1.5 Ω

Isolation Switch n-Channel

MOSFET Off-Threshold Voltage

GSTH

GATE

- V

, OUT = V+,

output current < 1µA

0.5 V

GATE Pulldown Switch

Resistance

Power-off mode, V

= +12V 38 80 Ω

GATE Charging Current I

GATE

= 2V 4.5 10

16.5

µA

GATE High Voltage V

GATE

= 1µA

5.59 5.76 5.93

OUT

- V

decreasing, V

GATE

= 5.75V

1.16 1.23 1.31

PGOOD Assertion V

OUT

Threshold (Note 10)

OUTEN

Hysteresis 70 mV

GATE

- V

increasing

4.62 4.76 4.91

PGOOD, PGOOD Assertion

GATE

Threshold

GSEN

Hysteresis 80 mV

PGOOD, PGOOD Output Low

Voltage

PGOOD

SINK

= 2mA, V

OUT

≤ (V+ - 5V) (Note 11) 0.2 V

PGOOD Leakage Current

GATE = high, V+ - V

OUT

= 67V (Note 11)

1µA

PGOOD Leakage Current

GATE = V

, PGOOD - V

= 67V

(Note 11)

1µA

1 2 3 4 5 6 7 8 ... 26 27

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