Rainbow-electronics MAX5953D Instrukcja Użytkownika Pobierz pdf (Strona 4)

MAX5953A/MAX5953B/MAX5953C/MAX5953D

IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (DC-DC Controller)

(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

Input Supply Range V

HVIN

11 76 V

OSCILLATOR (RTCT)

PWM Frequency f

250 kHz

Maximum PWM Duty Cycle D

MAX

47 %

Maximum RTCT Frequency f

RTCTMAX

(Note 12) 1 MHz

RTCT Peak Trip Level V

TH,RTCT

0.51 x V

REGOUT

RTCT Valley Trip Level V

TL,RTCT

RTCT Input Bias Current I

IN,RTCT

±1 µA

RTCT Discharge MOSFET

DS(ON)

DIS,RTCT

Sinking 50mA 35 85 Ω

RTCT Discharge Pulse Width 50 ns

LOOK-AHEAD LOGIC (PPWM)

PPWM to Output Propagation

Delay

PPWM

rising to V

XFRMRL

falling 110 ns

PPWM Output High V

OH,PPWM

Sourcing 2mA 7.0

11.0

PPWM Output Low V

OL,PPWM

Sinking 2mA 0.2 V

PWM COMPARATOR (OPTO, RAMP, RCFF)

Common-Mode Input Range V

CM_PWM

0 5.5 V

Input Offset Voltage 10 mV

Input Bias Current -2 +2 µA

RAMP to XFRMRL Propagation

Delay

COMPARATOR

From V

RAMP

(50mV overdrive) rising to

XFRMRL

rising

100 ns

Minimum OPTO Voltage V

CSS

= 0V, OPTO sinking 2mA

1.47

Minimum RCFF Voltage RCFF sinking 2mA

2.18

REGOUT LDO (REGOUT)

INBIAS unconnected,

HVIN

= 11V to 76V

8.3

8.75

9.2

REGOUT Voltage Set Point V

REGOUT

INBIAS

= V

HVIN

= 11V to 76V 9.5

10.6 11.0

INBIAS unconnected, V

HVIN

= 15V,

REGOUT

= 0 to 30mA

0.25

REGOUT Load Regulation

INBIAS

= V

HVIN

= 15V,

REGOUT

= 0 to 30mA

0.25

INBIAS unconnected, I

REGOUT

= 30mA

1.25

REGOUT Dropout Voltage

INBIAS

= V

HVIN

, I

REGOUT

= 30mA

1.25

REGOUT Undervoltage

Lockout Threshold

REGOUT rising 6.6 7.0 7.4 V

REGOUT Undervoltage

Lockout Threshold Hysteresis

REGOUT falling 0.7 V

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

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