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LNBS21_04 Datasheet, PDF (9/21 Pages) STMicroelectronics – LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
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LNBS21
Symbol
Parameter
Test Conditions
∆VO Line Regulation
VIN1=15 to 18V
VSEL=0
VSEL=1
∆VO Load Regulation
VSEL=0 or 1 IOUT = 50 to 750mA
IMAX Output Current Limiting
ISEL=1
ISEL=0
ISC Output Short Circuit Current
ISEL=1
ISEL=0
tOFF Dynamic Overload
protection OFF Time
PCL=0 Output Shorted
tON Dynamic Overload
protection ON Time
PCL=0 Output Shorted
fTONE Tone Frequency
TEN=1
ATONE Tone Amplitude
TEN=1
DTONE Tone Duty Cycle
TEN=1
tr, tf Tone Rise and Fall Time TEN=1
GEXTM External Modulation Gain ∆VOUT/∆VEXTM,
f = 10Hz to 40KHz
VEXTM External Modulation Input AC Coupling
Voltage
ZEXTM External Modulation
Impedance
f = 10Hz to 50KHz
VLT Loopthrough Switch Voltage EN=0,
Drop (lt1 to LT2)
19V
ILT=300mA,
VMI=12 or
fSW DC/DC Converter Switch
Frequency
fDETIN Tone Detector Frequency 0.4Vpp sinewave
Capture Range
VDETIN Tone Detector Input
Amplitude
fIN=22kHz sinewave
ZDETIN Tone Detector Input
Impedance
VOL Overload Flag Pin Logic
LOW
Tone present
IOL=2mA
IOZ Overload Flag Pin OFF
State Leakage Current
Tone absent
VOH = 6V
VIL DSQIN Input Pin Logic
LOW
VIH DSQIN Input Pin Logic
HIGH
IIH DSQIN Pins Input Current VIH = 5V
IOBK Output Backward Current EN=0
VOBK = 18V
TSHDN Temperature Shutdown
Threshold
∆TSHDN Temperature Shutdown
Hysteresis
Min. Typ. Max. Unit
5
40
mV
5
60
mV
200 mV
650
900 mA
750
1000 mA
300
mA
400
mA
900
ms
tOFF/10
20
22
24
0.55 0.72 0.9
40
50
60
5
10
15
6
400
ms
KHz
Vpp
%
µs
mVpp
260
Ω
0.35 0.6
V
220
kHz
18
24
kHz
0.2
1.5 Vpp
150
kΩ
0.3
0.5
V
10
µA
0.8
V
2
V
15
µA
-4
-10 mA
150
°C
15
°C
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