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VINETIC® Application Circuits 9.1.3 Application Circuits for Internal Ringing with DC/DC Figure 17 shows an example for a typical low-cost application of SLIC-DC in the P-DSO-24 package with a pnp-type switching transistor. By using a PMOS switch, efficiency could be slightly improved. The DC/DC part is dimensioned to allow dynamic ring voltage tracking. In Table 16 typical values of the external components are listed. unregulated supply voltage 9 .. 20V R1 D1 QSW R2 C2 R3 L1 C5 C4 C3 R4 SENSE VS C1 R5 SWD R6 CVR VN GND VINETIC/ DUSLIC DC/DC Converter GNDA Supply C6 COS C7 R7 R8 ROS C8 SYNC R9 EAN C1 C2 C2 IO1 C3 DCP DCP DCN DCN ACP ACP ACN ACN PEF 4268T SLIC-DC CITAC ITACA RIT1 ITA RL RP TIP CL CL RING IL RIT2 R10 VREF IT ILA C10 EAO Line-Interface C1 CODEC-Interface SLIC-Interface (1 channel) C9 RP RL RIL VCMITA Figure 17 Application Circuit Internal Ringing with DC/DC 1 Table 16 Components for SLIC-DC Application Circuit Symbol Function typ. Value Unit Tolerance 2 RL overcurrent limitation. stability 20 Ω 1 % (rel.) 2 CL EMC filtering 18 nF 5 % (rel.) 2 RP overcurrent limitation, EMC filtering 20 Ω 1 % (rel.) 1 RIT1 IT current/voltage conv. AC 510 Ω 1% 1 RIT2 IT current/voltage conv. DC 680 Ω 1% 1 RIL IL current/voltage conv. 3.3 kΩ 1% Preliminary Product Overview 69 Rating 100 V Rev. 2.0, 2004-05-11
