AM79489 데이터 시트보기 (PDF) - Unspecified

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AM79489

Subscriber Line Interface Circuit

Unspecified 

Table 2. User-Programmable Components (continued)

CBSWEN = 5 µmhos • TD(ms)

RFEED

=

2

•

RFU

SE

+

æ

è

-R----D---C---G-1---D-+----C-R----D----C---2-øö

CBSWEN is connected from BSWEN to GND for automatic

switching. TD is the delay in switching from BAT1 to BAT2.

The delay from BAT2 to BAT1 is about 0.1 TD.

The DC feed resistance can be adjusted with a resistance

(RFA) from the RFA pin to ground.

GDC = 47.9èæ1--4--2-0--0---k-k--Ω--Ω----+--+---R--R--F--F--A--A--øö

Thermal Management Equations (Active, Normal, and Reverse Polarity States)

RTMG

≥

--V-----B---A----T---2-----–-----6----V---

ILOOPmax

(OVH = 1)

RTMG is connected from TMG to VBAT2 and is used to limit

power dissipation within the SLIC in Active states only.

RTMG

≥

--V-----B---A----T---2-----–-----7---.-5-----V---

ILOOPmax

(OVH = 0)

PRTMG

=

(----V-----B---A----T---2------–----6-----V------–----(--I---L----•----R-----L---)--)---2--(---R----T---M-----G----)

(RTMG + 40)2

(OVH = 1)

Power dissipated in the thermal management resistor, RTMG,

during the Active states.

PRTMG

=

(----V-----B---A----T---2------–----7---.--5-----V-----–-----(--I---L----•----R----L----)--)--2---(---R----T---M----G-----)

(RTMG + 40)2

(OVH = 0)

PSLIC = ( VBAT2 • IL ) – PRTMG – RL • (IL)2 + 0.22 W

Power dissipated in the SLIC while in the Active states.

SLIC Products

11

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