Rainbow-electronics MAX5074 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX5074

Power IC with Integrated MOSFETs for Isolated IEEE

802.3af PD and Telecom Power-Supply Applications

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

HVIN

= 12V, C

INBIAS

= 1µF, C

REGOUT

= 2.2µF, R

RTCT

= 25kΩ, C

RTCT

= 100pF, C

BST

= 0.22µF, V

CSS

= V

= 0V, V

RAMP

= V

UVLO

= 3V,

= T

= -40°C to +125°C, unless otherwise noted. Typical values are at T

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

REGOUT LDO (REGOUT)

INBIAS floating, V

HVIN

= 11V to 76V 8.3 9.2

REGOUT Voltage Set Point V

REGOUT

INBIAS

= V

HVIN

= 11V to 76V 9.5 11.0

INBIAS floating, V

HVIN

= 15V, I

REGOUT

= 0

to 30mA

0.25

REGOUT Load Regulation

INBIAS

= V

HVIN

= 15V, I

REGOUT

= 0 to

30mA

0.25

INBIAS floating, I

REGOUT

= 30mA 1.25

REGOUT Dropout Voltage

INBIAS

= V

HVIN

, I

REGOUT

= 30mA 1.25

REGOUT Undervoltage Lockout

Threshold

REGOUT rising 6.6 7.4 V

REGOUT Undervoltage Lockout

Threshold Hysteresis

REGOUT falling 0.7 V

SOFT-START (CSS)

Soft-Start Current I

CSS

33 µA

INTEGRATING FAULT PROTECTION (FLTINT)

FLTINT Source Current I

FLTINT

80 µA

FLTINT Trip Point FLTINT rising 2.7 V

FLTINT Hysteresis 0.8 V

INTERNAL POWER MOSFETs (See Figure 1, QH and QL)

On-Resistance R

(

)

DRVIN

= V

BST

= 9V,

XFRMRH

= V

SRC

= 0V, I

= 50mA

0.4 0.8 Ω

Off-State Leakage Current -5 +5 µA

Total Gate Charge Per FET 15 nC

HIGH-SIDE DRIVER

Low-to-High Delay

Driver delay until FET V

reaches 0.9 x

BST

- V

XFRMRH

) and is fully on

80 ns

High-to-Low Delay

Driver delay until FET V

reaches 0.1 x

BST

- V

XFRMRH

) and is fully off

40 ns

Driver Output Voltage BST to XFRMRH with high side on 8 V

LOW-SIDE DRIVER

Low-to-High Delay

Driver delay until FET V

reaches 0.9 x

DRVIN

and is fully on

80 ns

High-to-Low Delay

Driver delay until FET V

reaches 0.1 x

DRVIN

and is fully off

40 ns

CURRENT-LIMIT COMPARATOR (CS)

Current-Limit Threshold Voltage V

ILIM

140 156 172 mV

Current-Limit Input Bias Current I

BILIM

0 < V

< 0.3V -2 +2 µA

1 2 3 4 5 6 7 8 ... 12 13

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