LM615 National Semiconductor, LM615 Datasheet - Page 9

• Manufacturer Part Number: LM615
• Description: LM615 Quad Comparator and Adjustable Reference
• Manufacturer: National Semiconductor

Application Information
Understanding that V
sistors and capacitors may be tied to the FEEDBACK pin a
range of V
FIGURE 6 Output Voltage has Negative Temperature
FIGURE 8 Diode in Series with R1 Causes Voltage
Across R1 and R2 to be Proportional to Absolute
FIGURE 7 Output Voltage has Positive TC
Coefficient (TC) if R2 has Negative TC
r
temperature coefficients may be synthesized
if R1 has Negative TC
Temperature (PTAT)
r
is fixed and that voltage sources re-
(Continued)
TL H 11057 – 14
TL H 11057 – 15
TL H 11057 – 16
9
Connecting a resistor across V
0 TC current source but a range of TCs may be synthe-
sized
I
Reference Hysteresis
The reference voltage depends slightly on the thermal his-
tory of the die Competitive micro-power products vary al-
ways check the data sheet for any given device Do not
assume that no specification means no hysteresis
e
FIGURE 10 Proportional-to-Absolute-Temperature
V
FIGURE 9 Current Source is Programmed by R1
r
R1
FIGURE 11 Negative-TC Current Source
e
1 24 R1
Current Source
RO
-to-FEEDBACK creates a
TL H 11057– 18
TL H 11057– 19
TL H 11057– 17