Rainbow-electronics MAX17480 Bedienungsanleitung PDF herunterladen (Seite 8)

MAX17480

AMD 2-/3-Output Mobile Serial

VID Controller

8 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 2, V

= 12V, V

= V

IN3

= SHDN = PGD_IN = 5V, V

DDIO

= 1.8V, OPTION = GNDS_ = AGND = PGND,

FBDC_ = FBAC_ = OUT3 = CSP_ = CSN_ = 1.2V, all DAC codes set to the 1.2V code, T

= -40°C to +105°C, unless otherwise

noted. Typical values are at T

= +25°C.) (Note 5)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SMPS1 AND SMPS2 CONTROLLERS

GNDS_ Input Range V

GNDS_

Separate mode -200 +200 mV

GNDS_ Gain A

GNDS_

Separate: V

OUT

_/V

GNDS

-200mV 

GNDS

_  +200mV; combined;

V

OUT

/ V

GNDS_,

-200mV  V

GNDS_

 +200mV

0.95 1.05 V/V

Combined-Mode Detection

Threshold

GNDS1, GNDS2, detection after REFOK,

latched, cleared by cycling SHDN

0.7 0.9 V

Maximum Duty Factor D

MAX

90 %

Minimum On-Time t

ONMIN

150 ns

SMPS1 AND SMPS2 CURRENT LIMIT

Current-Limit Threshold

Tolerance

LIMIT

CSP

_ - V

CSN

_ = 0.052 x (V

REF

- V

ILIM

REF

- V

ILM

) = 0.2V to 1.0V

-3 +3 mV

Idle-Mode Threshold Tolerance V

IMIN

CSP

_ - V

CSN

_, skip mode, 0.15 x V

LIMIT

-2 +2 mV

CS_ Common-Mode Input Range CSP_ and CSN_ 0 2 V

SMPS1 AND SMPS2 DROOP, CURRENT BALANCE, AND TRANSIENT RESPONSE

AC Droop and Current Balance

Amplifier Transconductance

m(FBAC

)

I

FBAC

_/(V

_), V

FBAC

_ = V

CSN

_ = 1.2V,

CSP

_ - V

CSN

_ = 0 to +40mV

1.94 2.06 mS

AC Droop and Current Balance

Amplifier Offset

FBAC

_/G

m(FBAC

)

-1.5 +2.0 mV

Transient Detection Threshold

Measured at FBDC_ with respect to

steady-state FBDC_ regulation voltage,

10mV hysteresis (typ)

-47 -33 mV

SMPS3 INTERNAL 4A STEP-DOWN CONVERTER

OUT3 Load Regulation R

DROOP3

4 7 mV/A

ON(NH3)

High-side n-channel 150

Internal MOSFET On-Resistance

ON(NL3)

Low-side n-channel 75

m

LX3 Peak Current Limit I

LX3PK

ILIM3 = V

CC,

skip mode 4.75 6 A

Maximum Duty Factor D

MAX

84 %

Minimum On-Time t

ONMIN

150 ns

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 47 48

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