E-STLC3075 Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
E-STLC3075 Datasheet PDF : 36 Pages
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STLC3075
Application information
Table 12. External components for flyback configuration
Name
Function
Formula
Typ. value
RRX
RREF
CSVR
RD
CAC
RP
RLIM
RTH
Rx input bias resistor
Bias setting current
RREF = 1.3/Ibias; Ibias = 50 µA
Negative battery filter
CSVR = 1/(2π ⋅ fp ⋅ 1.8 MΩ)
fp = 50 Hz
Ring trip threshold setting
resistor
RD = 100/IRTH
2 kΩ < RD < 5 kΩ
AC/DC split capacitance
Line protection resistor
Rp > 30 Ω
RLIM = 1300/Ilim
Current limiting programming
32.5 kΩ < RLIM < 65 kΩ
Off-hook threshold
RTH = 290/ITH
programming (Active mode) 27 kΩ < RTH < 52 kΩ
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
CREV
RDD
Reverse polarity transition
time programming
Pull up resistors
CREV = ((1/3750)· ΔT/ΔVTR)
22 nF 10% 10 V @ 12 V/ms
100 kΩ
CVCC
CVPOS
CV
CVB
CRD(3)
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
100 nF 20 % 10 V
100 µF(1)
100 µF 20 % 100 V(2)
470 nF 20% 100 V
100 nF 10% 15 V
CZ
Flyback compensation
capacitor
CSF Sense filter capacitor
RSF Sense filter resistor
RSENSE
DC/DC converter peak
current limiting
Q1
DC/DC converter switch N
channel MOS transistor
RSENSE = 375 mV/IPK
RDS(ON)≤0.05 Ω,
VDSS = 30 V
VDG=30 V, ID = 6.5 A
Low threshold drive
2.2 nF, 20 %
120 pF, 20 %
1 kΩ
220 mΩ @ IPK = 1.7 A
STN4NF03L or equivalent
D1
DC/DC converter series
diode
Vr > 350 V, tRR ≤ 80 ns
SMBYTW01-400 or equivalent
Flyback transformer 4W, turns ratio
T1 DC/DC converter transformer 1:16 for VPOS range from 4.5 V to
8.5 V
Tyco COEV MAGNETICS
MGPWG-00007
or Coilcraft FA2469-AL(4)
19/36
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