STLC3055N_09 STMICROELECTRONICS [STMicroelectronics], STLC3055N_09 Datasheet - Page 18

• Manufacturer Part Number: STLC3055N_09
• Description: WLL and ISDN-TA subscriber line interface circuit
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Application information
Table 10.
1. CVpos should be defined depending on the power supply current capability and maximum allowable ripple.
2. For low ripple application use 2 x 47 μF in parallel.
3. Can be saved if proper PCB layout avoid noise coupling on RD pin (high impedance input).
4
5
Table 11.
18/34
RSENSE
CRD
CVpos
Name
Name
ZA
CVB
RF1
RF2
ZAC
RF1 sets the self generated battery voltage in Ring and Active (Il=0) mode as follows:
V
provided that the Vpos power supply current capability and the RSENSE programming allow to source all the current
requested by the particular ringer load configuration.
For high efficiency in HI-Z mode coil resistance @125 kHz must be < 3 Ω
CV
Q1
RS
D1
BATR
L
(1)
(3)
V
V
should be defined considering the ring peak level required (Vringpeak=V
BAT(ACTIVE)
BATR(RING)
Positive supply filter capacitor
with low impedance for switch
mode power supply
Battery supply filter capacitor
with low impedance for switch
mode power supply
High frequency noise filter
High frequency noise filter
DC/DC converter switch P-
channel MOS transistor
DC/DC converter series diode
DC/DC converter peak current
limiting
Negative battery programming
level
Negative battery programming
level
DC/DC converter inductor
Protection resistance image
Two wire AC impedance
SLIC impedance balancing
network
External components (continued)
External components @gain set = 0
Function
Function
267 kΩ
-46 V
-62 V
RDS(ON) ≤ 1.2 Ω,VDS = -100 V
Total gate charge = 20 nC max.
with VGS = 4.5 V and VDS = 1 V
ID > 500 mA
V
R
250 kΩ < RF1 < 300 kΩ
DC resistance ≤ 0.1 Ω
RS = 50 ⋅ (2Rp)
ZAC = 50 ⋅ (Zs - 2Rp)
ZA = 50 ⋅ Zs
r
SENSE
> 100 V, t
280 kΩ
-48 V
-65 V
= 100 mV/I
Formula
Formula
RR
≤ 50 ns
PK
(5)
(4)
294 kΩ
-49 V
-68 V
BATR
-6 V typ.). The above relation is valid
SUMIDA CDRH125 or equivalent
25 kΩ 1% @ Zs = 600 Ω
30 kΩ 1% @ Zs = 600 Ω
IRF9510 or IRF9520 or
IRF9120 or equivalent
100 μF 20% 100 V
5 kΩ @ Rp = 50 Ω
470 nF 20% 100 V
Possible choiches:
100 nF 10% 15 V
@ V
SMBYW01-200
@I
or equivalent
Typ. value
300 kΩ
300 kΩ 1%
9.1 kΩ 1 %
Typ. value
L=100 μH
PK
-50 V
-70 V
100 μF
BATR
110 mΩ
= 900 mA
= -70 V
(1)
STLC3055N
(2)