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E-STLC3075 View Datasheet(PDF) - STMicroelectronics

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E-STLC3075 Datasheet PDF : 36 Pages
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STLC3075
Functional description
4.2.3
Active
DC characteristics & supervision
When this mode is selected the STLC3075 provides both DC feeding and AC transmission.
The STLC3075 feeds the line with a constant current fixed by RLIM (20 mA to 40 mA
range). The on-hook voltage is typically 40 V allowing on-hook transmission; the self
generated Vbat is -50 V typical.
If the loop resistance is very high and the line current cannot reach the programmed
constant current feed value, the STLC3075 behaves like a 40 V voltage source with a series
impedance equal to the protection resistors 2xRp (typ. 2x50 Ω). Figure 4. shows the typical
DC characteristics in active mode.
The line status (on/off hook) is monitored by the SLIC’S supervision circuit. The off-hook
threshold can be programmed via the external resistor RTH in the range from 5mA to 9mA.
Independently on the programmed constant current value, the TIP and RING buffers have a
current source capability limited to 80mA typical.
Figure 4. DC characteristics in active mode
IL
Ilim
(20 to
40mA)
2Rp
VL
10V
Vbat (-50V)
Moreover the power available at Vbat is controlled by the DC/DC converter that limits the
peak current drawn from the VPOS supply. The maximum allowed current peak is set by
RSENSE resistor.
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