STLC3075 Datasheet, PDF (11/26 Pages) STMicroelectronics – INTEGRATED POTS INTERFACE FOR HOME ACCESS GATEWAY AND WLL

STLC3075
Table 10. External Components for BuckBoost configuration
Name
Function
RREF Bias setting current
CSVR Negative Battery Filter
RD
CAC
Ring Trip threshold setting
resistor
AC/DC split capacitance
Formula
RREF = 1.3/Ibias
Ibias = 50µA
CSVR = 1/(2π ⋅ fp ⋅ 1.8MΩ)
fp = 50Hz
RD = 100/I_RTH
2KΩ < RD < 5KΩ
RP
RLIM
RTH
CREV
RDD
CVCC
CVpos
CV
CVB
CRD (6)
Q1
D1
Line protection resistor
Current limiting programming
Off-hook threshold programming
(ACTIVE mode)
Reverse polarity transition time
programming
Pull up resistors
Internally supply filter capacitor
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 ch.
MOS transistor
DC/DC converter series diode
Rp > 30Ω
RLIM = 1300/Ilim
32.5kΩ < RLIM < 65kΩ
RTH = 290/I_TH
27kΩ < RTH < 52kΩ
CREV = ((1/3750) · ∆T/∆V_TR)
RDS(ON)≤1.2Ω,VDS = -100V
Total gate charge=20nC max.
with VGS=4.5V and VDS=1V
ID>500mA
V_r > 100V, t_RR ≤ 50ns
RSENSE DC/DC converter peak current
limiting
R_SENSE = 100mV/I_PK
RF1 Negative battery programming
level
250KΩ<RF1<300KΩ (7)
RF2 Negative battery programming level
L
DC/DC converter inductor
DC resistance ≤ 0.1Ω (8)
Typ. Value
26kΩ 1%
1.5nF 10%
100V
4.12kΩ 1%
@ IRTH = 24mA
22µF 20% 15V
@ RD = 4.12kΩ
50Ω 1%
52.3kΩ 1%
@ Ilim = 25mA
32.4kΩ 1%
@I_TH = 9mA
22nF 10% 10V
@ 12V/ms
100kΩ
100nF 20% 10V
100µF(4)
100µF 20% 100V (5)
470nF 20% 100V
100nF 10% 15V
Possible choiches:
IRF9510 or IRF9520 or
IRF9120 or equivalent
SMBYW01-200
or equivalent
110mΩ
@I_PK = 900mA
300kΩ 1%
@ V_BATR = -70V
9.1kΩ 1%
L=100µH
SUMIDA CDRH125 or equivalent
Table 11. External Components for Fly-back configuration
Name
RREF
CSVR
Function
Bias setting current
Negative Battery Filter
RD
CAC
Ring Trip threshold setting
resistor
AC/DC split capacitance
Formula
RREF = 1.3/Ibias; Ibias = 50µA
CSVR = 1/(2π ⋅ fp ⋅ 1.8MΩ)
fp = 50Hz
RD = 100/I_RTH
2KΩ < RD < 5KΩ
Typ. Value
26kΩ 1%
1.5nF 10%
100V
4.12kΩ 1%
@ IRTH = 24mA
22µF 20% 15V
@ RD = 4.12kΩ
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