E-STLC3075 Просмотр технического описания (PDF) - STMicroelectronics
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E-STLC3075 Datasheet PDF : 36 Pages
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STLC3075
Application information
Table 10. External components for buckboost configuration
Name
Function
Formula
RRX
Rx input bias resistor
RREF Bias setting current
CSVR Negative battery filter
RREF = 1.3/Ibias
Ibias = 50 μA
CSVR = 1/(2π ⋅ fp ⋅ 1.8 MΩ)
fp = 50 Hz
RD
Ring trip threshold setting
resistor
RD = 100/IRTH
2 kΩ < RD < 5 kΩ
CAC
RP
AC/DC split capacitance
Line protection resistor
Rp > 30Ω
RLIM
RLIM = 1300/Ilim
Current limiting programming
32.5 kΩ < RLIM < 65 kΩ
RTH
Off-hook threshold
programming (Active mode)
RTH = 290/ITH
27 kΩ < RTH < 52 kΩ
CREV
Reverse polarity transition
time programming
CREV = ((1/3750) · ΔT/ΔVTR)
RDD
Pull up resistors
CVCC
Internally supply filter
capacitor
CVPOS
Positive supply filter capacitor
with low impedance for switch
mode power supply
Battery supply filter capacitor
CV
with low impedance for switch
mode power supply
CVB
CRD(3)
High frequency noise filter
High frequency noise filter
RDS(ON)≤1.2 Ω, VDS = -100 V
DC/DC converter switch P ch. Total gate charge= 20 nC max.
Q1
MOS transistor
with VGS=4.5 V and VDS=1 V
ID>500 mA
D1
DC/DC converter series diode Vr > 100 V, tRR ≤ 50 ns
RSENSE
RF1
RF2
DC/DC converter peak current
limiting
RSENSE = 100mV/IPK
Negative battery programming
level
250KΩ < RF1 < 300KΩ(4)
Negative battery programming
level
L
DC/DC converter inductor
DC resistance ≤ 0.1 Ω(5)
Typ. value
100 kΩ 5%
26 kΩ 1%
1.5 nF 10%
100 V
4.12 kΩ 1%@ IRTH = 24 mA
22 µF 20% 15 V @ RD = 4.12 kΩ
50 Ω 1%
52.3 kΩ 1% @ Ilim = 25 mA
32.4 kΩ 1% @ ITH = 9 mA
22 nF 10% 10V @ 12 V/ms
100 kΩ
100 nF 20% 10 V
100 µF(1)
100 µF 20% 100V (2)
470 nF 20% 100 V
100 nF 10% 15 V
Possible choices:
IRF9510 or IRF9520 or
IRF9120 or equivalent
SMBYW01-200
or equivalent
110 mΩ @ IPK = 900 mA
300 kΩ 1% @ VBATR = -70 V
9.1 kΩ 1%
L=100 µH
SUMIDA CDRH125 or equivalent
17/36
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