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LTC2995 Folha de dados(PDF) 13 Page - Linear Technology

Nome de Peças LTC2995
Descrição Electrónicos  Temperature Sensor and Dual Voltage Monitor
PDF  20 Pages
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Fabricante Electrônico  LINER [Linear Technology]
Página de início  http://www.linear.com
Logo LINER - Linear Technology

LTC2995 Folha de dados(HTML) 13 Page - Linear Technology

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LTC2995
13
2995f
D+
DS
D–
1.2V
200k
400k
1.8V
VCC
VREF
RTC
VT2
VT1
VCC
VPTAT
PS
TO2
TO1
3.3V
LTC2995
2995 F06
OT ALARM
OT WARNING
RTB
RTA
GND
–
+
TO1/TO2
PULSE
GENERATOR
UVLO
VCC
400k
VCC
400k
T/V
Figure 5. Temperature Thresholds
Figure 6. Monitoring Internal Temperature with Two Overtemperature Thresholds
APPLICATIONS INFORMATION
Temperature Thresholds
The threshold voltages at VT1 and VT2 can be set with
the 1.8V reference voltage (VREF) and a resistive divider
as shown in Figure 5.
The following design procedure can be used to size the
resistive divider.
1. Calculate Threshold Voltages:
VT1
= T1• 4
mV
K
•
ηACT
1.004
VT2
= T2 • 4
mV
K
•
ηACT
1.004
where
ηACT denotes the actual ideality factor if an external
sensor is used and T1 and T2 are the desired threshold
temperatures in degrees Kelvin.
2. Choose RTA to obtain the desired VT1 threshold for
a desired current through the resistive divider
(IREF):
RTA =
VT1
IREF
3. Choose RTB to obtain the desired VT2 threshold:
RTB =
VT2 – VT1
IREF
2995 F05
VPTAT
RTC
RTB
RTA
VREF = 1.8V
1.8V
SLOPE =
ACT
η
O
T
200k
T1
T2
VT2
VT1
O.8V
K
mV



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