MAX5942ACSE データシートの表示（PDF） - Maxim Integrated

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MAX5942ACSE

IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller for Power Devices

Maxim Integrated 

IEEE 802.3af Power-Over-Ethernet

Interface/PWM Controller for Power Devices

ELECTRICAL CHARACTERISTICS (continued)

(VIN = (GND - VEE) = 48V, GATE = PGOOD = PGOOD = OPEN, V- tied to OUT, V+ tied to GND, UVLO = VEE, TA = TMIN to TMAX,

unless otherwise noted. Typical values are at TA = +25°C. All voltages are referenced to VEE, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

UVLO Bias Current

IUVLO UVLO = 2.460V

-1.5

+1.5

µA

UVLO Input Ground Sense

Threshold

VTH,G,UVLO (Note 8)

50

440

mV

UVLO Input Ground Sense Glitch

Rejection

UVLO = VEE

7

µs

Power Turn-Off Voltage,

Undervoltage Lockout Deglitch

tOFF_DLY VIN, VUVLO falling (Note 9)

0.32

ms

Time

Isolation Switch N-Channel

MOSFET On-Resistance

RON

Output current =

TA = +25°C

300mA, VGATE = 5.6V, (Note 11)

measured between

OUT and VEE

TA = +85°C

0.6

1.1

Ω

0.8

1.5

Isolation Switch N-Channel

MOSFET Off-Threshold Voltage

VGSTH

OUT = GND, VGATE - VEE, output current

< 1µA

0.5

V

GATE Pulldown Switch Resistance

RG

Power-off mode, VIN = 12V, UVLO = VEE

38

80

Ω

GATE Charging Current

IG

VGATE = 2V

5

10

15

µA

GATE High Voltage

VGATE IGATE = 1µA

5.58 5.76 5.93

V

PGOOD, PGOOD Assertion

VOUT Threshold

VOUTEN

VOUT - VEE, |VOUT - VEE| decreasing,

VGATE = 5.75V

Hysteresis

1.15 1.23 1.31

V

70

mV

PGOOD, PGOOD Assertion

VGATE Threshold

PGOOD Output Low Voltage

PGOOD Output Low Voltage

PGOOD Leakage Current

PGOOD Leakage Current

VGSEN

(GATE - VEE) increasing, OUT = VEE

Hysteresis

4.62 4.76 4.91

V

80

mV

VOLDCDC ISINK = 2mA (Note 10)

0.4

V

ISINK = 2mA, OUT ≤ (GND - 5V) (Note 10)

0.2

V

GATE = high, GND - VOUT = 67V (Note 10)

1

µA

GATE = VEE, PGOOD - VEE = 67V (Note 10)

1

µA

ELECTRICAL CHARACTERISTICS (PWM Controller)

(All voltages referenced to V-. VDD = 13V, a 10µF capacitor connects VCC to V-, VCS = V-, V+ = 48V, 0.1µF capacitor connected to

SS_SHDN, NDRV = open circuit, VFB = 3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

SUPPLY CURRENT

V+ Supply Current

IV+(NS)

IV+(S)

VDD = 0V, V+ = 67V, driver not switching

V+ = 67V, VDD = 0V, VFB = 4V, driver

switching

0.8

1.6

mA

1.6

3.2

V+ Supply Current After Startup

V+ = 67V, VDD = 13V, VFB = 4V

14

µA

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