LTC2974 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2974' PDF : 32 Pages View PDF
LTC2945
TYPICAL APPLICATIONS
Power Monitoring in –48V System Using Low Side Sensing (1.5kHz I2C Interface)
–48V
RTN
R1 R2
20k 20k
C2
0.1μF
C1 VDD INTVCC ADR1
1μF
SCL
R4 R3
1k 1k
R7 R8 R9 R10 R11
0.51k 0.51k 10k 10k 10k
3.3V
VDD
VEE
–48V INPUT
LTC2945
SDAI
GND
ADIN
ADR0
SDAO
VEE
MOCD207M
ALERT
SENSE– SENSE+
MOCD207M
CONTROL REGISTER A2 = 0
RSNS
0.02Ω
VOUT
SCL
μP
SDA
INT
GND
2945 TA05
Power Monitoring in –48V Harsh Environment Using INTVCC Shunt Regulator to Tolerate 200V Transients
–48V
RTN
RSHUNT
R12
3 × 1.8k IN SERIES 100
VDD
INTVCC
ADR1
R5
735k
C1
LTC2945 SCL
1μF
ADIN
SDAI
R6
15k
GND
ADR0
SDAO
Q1
D1
PZTA42 1N4148WS
R4 R3
R1 R2
1k 0.51k 1k 1k
C2
1μF
VEE
VCC
R7
0.51k
R8
R9
0.51k 1k
R10 R11
1k 10k
3.3V
VDD
SCL
GND
HCPL-063L VEE
3.3V
VCC
μP
SDA
VEE
–48V INPUT
SENSE–
ALERT
SENSE+
GND
HCPL-063L
CONTROL REGISTER A0 = 0
RSNS
0.02Ω
VOUT
INT
GND
2945 TA06
2945f
26
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