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STLC3055N Datasheet(PDF) 6 Page - STMicroelectronics |
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STLC3055N Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 25 page STLC3055N 6/25 The off-hook threshold in HI-Z mode is the same value as programmed in ACTIVE mode. The DC characteristic in HI-Z mode is just equal to the self generated battery with 2x(1600 Ω+Rp) in series (see fig. 4), where Rp is the external protection resistance. No AC transmission is possible in this mode. Figure 4. DC Characteristic in HI-Z Mode. 3.2.3 Active 3.2.3.1 DC Characteristics & Supervision When this mode is selected the STLC3055N provides both DC feeding and AC transmission. The STLC3055N feeds the line with a constant current fixed by RLIM (20mA to 40mA range). The on-hook voltage is typically 40V allowing on-hook transmission; the self generated Vbat is -50V typ. If the loop resistance is very high and the line current cannot reach the programmed constant current feed value, the STLC3055N behaves like a 40V voltage source with a series impedance equal to the protection resistors 2xRp (typ. 2x50 Ω). Fig. 5 shows the typical DC characteristic in ACTIVE mode. Figure 5. DC Characteristic 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 typ. 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. 3.2.3.2 AC Characteristics The SLIC provides the standard SLIC transmission functions: Once in active mode the SLIC can operate with two different Tx, Rx Gain. Setting properly by the Gain set Vbat IL VL Vbat (-50V) 2x(R1+Rp) Slope: 2x(R1+Rp) (R1=1600ohm) IL Ilim VL Vbat (-50V) 10V 2Rp (20 to 40mA) |
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