Rainbow-electronics MAX5953D Manual do Utilizador descarregar pdf (Página 5)

MAX5953A/MAX5953B/MAX5953C/MAX5953D

IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

_______________________________________________________________________________________ 5

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

SOFT-START (CSS)

Soft-Start Current I

CSS

= 0V 33 µA

INTEGRATING FAULT PROTECTION

FLTINT Source Current I

FLTINT

80 µA

FLTINT Trip Point V

FLTINT

rising 2.7 V

FLTINT Hysteresis

0.75

INTERNAL POWER FETs

On-Resistance

POWER

DRVIN

= V

BST

= 9V,

XFRMRH

= V

SRC

= 0V, I

= 50mA

0.4 0.8 Ω

Off-State Leakage Current -5

+10

µA

Total Gate Charge Per Power

FET

15 nC

HIGH-SIDE DRIVER

Low to High Latency t

LH-HS

Driver delay until FET V

reaches 0.9 x

BST

- V

XFRMRH

) and is fully on

80 ns

High to Low Latency t

HL-HS

Driver delay until FET V

reaches 0.1 x

BST

- V

XFRMRH

) and is fully off

40 ns

Output Drive Voltage V

BST

BST to XFRMRH with high side on 8 V

LOW-SIDE DRIVER

Low to High Latency t

LH-LS

Driver delay until FET V

reaches 0.9 x

DRVIN

and is fully on

80 ns

High to Low Latency t

HL-LS

Driver delay until FET V

reaches 0.1 x

DRVIN

and is fully off

40 ns

CURRENT-LIMIT COMPARATOR (CS)

Current-Limit Threshold

Voltage

ILIM

140

156

172

Current-Limit Input Bias

Current

BILIM

0 < V

< 0.3V -2 +2 µA

Propagation Delay to XFRMRL

dILIM

From V

rising (10mV overdrive) to

XFRMRL

rising

160 ns

BOOST VOLTAGE CIRCUIT (See Figure 9, QB)

Driver Output Delay t

PPWMD

200 ns

One-Shot Pulse Width t

PWQB

300 ns

QB R

DSON

Sinking 20mA 30 60 Ω

THERMAL SHUTDOWN

Shutdown Temperature T

Temperature rising

+160

°C

Thermal Hysteresis T

20 °C

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

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