參數(shù)資料
型號: TL7705
廠商: Texas Instruments, Inc.
英文描述: Supply voltage Supervisor
中文描述: 電源電壓監(jiān)控
文件頁數(shù): 14/17頁
文件大?。?/td> 340K
代理商: TL7705
Application
examples
10
Literature Number: SLVAE04
Figure 11. Typical Variation of the Reference Voltage V
ref
versus
supply Voltage Variations
As has already been mentioned the supply voltage supervisors of the series TL77xxA incorporate
extremely stable reference voltage source which can be accessed at the V
terminal. This voltage source
can also be used when in other applications a constant voltage source is required. As shown in picture 11,
the reference voltage V
ref
varies less than 10 mV, when the supply voltage is changed from 3.5
18 V.
The same stability of the reference voltage is maintained, when the ambient temperature is changed.
Figure 12 shows the typical characteristic. The references voltage varies only 16mV, when the ambient
temperature is changed from -40
85
°
C.
2,506 V
2,508 V
2,51 V
2,512 V
2,514 V
2,516 V
2,518 V
2,52 V
2,522 V
-40
-20
0
20
40
60
80
100
V
ref
T
a
/
°
C
Figure 12. Typical Variation of the Reference Voltage V
ref
versus
Ambient Temperature Variations
When using the integrated reference voltage to supply other circuits, the designer has to consider that
maximum current available from this voltage source is in the order of 100
μ
A only. With higher loads, the
stability of the reference voltage suffers. For higher currents a buffer in the form of an operational amplifier
connected as an emitter follower is recommended (figure 13). If the voltage monitor section of the circuit is
not used in this application, the capacitor C
is not required. This terminal may then be left open. The inputs
SENSE and RESIN are connected to ground.
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