Rainbow-electronics MAX5953D Manual de usuario descargar pdf (Pagina 6)

MAX5953A/MAX5953B/MAX5953C/MAX5953D

IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (DC-DC Controller) (continued)

(All voltages referenced to GND, unless otherwise noted. V

HVIN

= +48V, C

INBIAS

= 1µF, C

REGOUT

= 2.2µF, R

RTCT

= 25kΩ, C

RTCT

100pF, C

BST

= 0.22µF, V

CSS

= V

= 0V, V

RAMP

= V

DCUVLO

= 3V, T

= 0°C to +125°C, unless otherwise noted. Typical values are at

= +25°C, unless otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS

MIN TYP MAX

UNITS

UNDERVOLTAGE LOCKOUT (DCUVLO)

Threshold Voltage

REF

DCUVLO

rising

1.14 1.26 1.38

Hysteresis

HYS

DCUVLO

140 mV

Input Bias Current I

IN,DCUVLO

DCUVLO

= 3V

-100 +100

SUPPLY CURRENT

From V

HVIN

= 11V to 76V,

CSS

= 0V, V

INBIAS

= 11V

0.7 1.5

From V

INBIAS

= 11V to 76V,

CSS

= 0V, V

HVIN

= 76V

4.4 6.4

Supply Current

From V

HVIN

= 76V, V

OPIO

= 4V 7

Standby Supply Current V

DCUVLO

= 0V 1 mA

Note 1: Limits at 0°C are guaranteed by design, unless otherwise noted.

Note 2: The input offset current is illustrated in Figure 1.

Note 3: Effective differential input resistance is defined as the differential resistance between V+ and V

without any external

resistance.

Note 4: Classification current is turned off whenever the IC is in power mode.

Note 5: See Table 2 in the Classification Mode section. R

DISC

and R

RCLASS

must be 1%, 100ppm or better. I

CLASS

includes the IC

bias current and the current drawn by R

DISC

Note 6: See the Thermal Dissipation section.

Note 7: When UVLO is connected to the midpoint of an external resistor-divider with a series resistance of 25.5kΩ (±1%), the turn-

on threshold set point for the power mode is defined by the external resistor-divider. Make sure the voltage on UVLO does

not exceed its maximum rating of 8V when V

is at the maximum voltage.

Note 8: When V

UVLO

is below V

TH,G,UVLO

, the MAX5953A/MAX5953C set the turn-on voltage threshold internally (V

UVLO,ON

Note 9: An input voltage or V

UVLO

glitch below their respective thresholds shorter than or equal to t

OFF_DLY

does not cause the

MAX5953A/MAX5953B/MAX5953C/MAX5953D to exit power-on mode (as long as the input voltage remains above an

operable voltage level of 12V).

Note 10: Guaranteed by design, not tested in production for MAX5953B/MAX5953D.

Note 11: PGOOD references to OUT while PGOOD references to V

Note 12: Output switching frequency is

oscillator frequency.

Figure 1. Effective Differential Input Resistance/Offset Current

INi + 1

INi

OFFSET

1VV

INi

INi + 1

OFFSET

≅ I

INi

≅

INi + 1

- V

INi

)

INi + 1

- I

INi

)

INi + 1

- I

INi

)

1 2 3 4 5 6 7 8 9 10 11 ... 26 27

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Rainbow-electronics MAX5953D Manual de usuario Pagina 6

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