Application examples

10

Literature Number: SLVAE04

Figure 11. Typical Variation of the Reference Voltage V

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

can also be used when in other applications a constant voltage source is required. As shown in picture 11,

the reference voltage 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

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

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

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

SENSE and RESIN are connected to ground.