HC55185_06 Datasheet, PDF (17/20 Pages) Intersil Corporation – VoIP Ringing SLIC Family

Basic Application Circuit
C_PS1
C_PS2
C_PS3
D₁
R_P1
R_P2
C_RT
R_RT
R_SH
R_IL
V_CC
C_DC
C_POL
R_TL
VCC VBL VBH
TIP
U₁
HC55185
VRX
VRS
RING
VTX
SW+
-IN
SW-
RTD
VFB
RD
ILIM
CDC
POL
TL
AGND
SWC
BSEL
E0
F0
F1
F2
DET
ALM
BGND
C_RX
C_RS
R_S ^CTX
C_FB
HC55185
TABLE 4. BASIC APPLICATION CIRCUIT COMPONENT
LIST
COMPONENT
VALUE
TOL RATING
U1 - Ringing SLIC
HC55185
N/A
N/A
R_TL
18.7kΩ
1%
0.1W
R_RT
23.7kΩ
1%
0.1W
R_SH
49.9kΩ
1%
0.1W
R_IL
71.5kΩ
1%
0.1W
R_S
66.5kΩ
1%
0.1W
C_RX, C_RS, C_TX, C_RT, C_POL 0.47μF
20%
10V
C_DC, C_FB
4.7μF
20%
10V
C_PS1
0.1μF
20%
>100V
C_PS2, C_PS3
0.1μF
20%
100V
D₁
1N400X type with breakdown > 100V.
R_P1, R_P2
Standard applications will use ≥ 49Ω per side. Protection resistor
values are application dependent and will be determined by
protection requirements.
Design Parameters: Ring Trip Threshold = 76mA_PEAK, Switch
Hook Threshold = 12mA, Loop Current Limit = 24.6mA, Synthesize
Device Impedance = (3*66.5kΩ)/400 = 498.8Ω, with 49.9Ω
protection resistors, impedance across Tip and Ring
terminals = 599Ω. Transient current limit = 95mA.
FIGURE 15. HC55185 BASIC APPLICATION CIRCUIT
17
FN4831.14
December 18, 2006