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L3092N Datasheet

  • L3092N

  • SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH FIRST AND SECO...

  • 410.95KB

  • 32頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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L3000N - L3092
In the same condition the power dissipation of
L3092 is typically 100mW.
Figure 1:
DC Characteristics in Conversation
Mode
When the SLIC is in Stand-by mode, the power
dissipation of L3000N does not exceed
120mW from 鈥?48V) eventually increased of a
certain amount if some current is flowing into the
line.
The power dissipation of the L3092 in the same
condition is typically 50mW.
SBY Mode is usually selected when the tele-
phone is in on-hook. It allows a proper off-hook
detection also in presence of high common mode
line current or with telephone set sinking few mil-
liAmpere of line current in on hook condition.
Figure 3:
DC Characteristics in Stand-by Mode
Figure 2:
Line Current versus Loop Resistance -
RFS = 200鈩? Limiting Currents:
25/40/60mA
2) STAND-BY (SBY) MODE
In this mode the bias currents of both L3000N
and L3092 are reduced as only some parts of the
two circuits are completely active, control inter-
face and current sensors among them. The cur-
rent supplied to the line is limited at 10mA, and
the slope of the DC characteristic corresponds to
2 x RFS.
The AC characteristic in Stand-by corresponds to
a low impedance (2 x RP)
In Stand-by mode the line voltage polarity is just
in direct condition, that is the TIP wire more posi-
tive than the RING one as in Conversation Mode.
8/32
3) POWER DOWN (PD) MODE
In this mode the L3000N present a high imped-
ance (> 1 Mohm) to the line and cannot feed any
line current.
The L3092 forces L3000N in Power Down discon-
necting its bias Resistor, RH, from the ground
through the output pin PD0.
The power dissipation from the battery volt-
age (鈥?VB) is almost equal to zero and the power
dissipation of L3092 is typically 50mW.
The PD mode is normally used in emergency
condition but can be used also in normal on-hook
condition.
In this case the off-hook detection is performed
using the line sense comparator integrated in the
L3092.
The fig. 4 shows the functional circuit to perform
the off hook detection in Power down mode.
The resistor RR and RT feed the line current. The
voltage at the terminal of the resistor RS con-
nected to RING wire is normally 鈥?48V.
When there is a loop resistor between TIP and

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