HA17431 Series

REJ03D0678-0300 Rev.3.00 Apr 03, 2007

Page 14 of 19

Application Hints

(cont.)

No.

Application Example

Description

6

Constant voltage regulator circuit

Cf

Q

Vout

GND

GND

This is a 3-pin regulator with a discrete configuration, in which the

output voltage

Vout = 2.5 V

×

and the output transistor Q base current.

7

Discharge type constant current circuit

GND

R

Q

2.5 V

+

–

This circuit supplies a constant current of

[A] into the load. Caution is required

2.5 V

The requirement in this circuit is that the cathode current must be

order of several mA or more.

8

Induction type constant current circuit

GND

R

Q

2.5 V

+

–

In this circuit, the load is connected on the collector side of

transistor Q in circuit 7 above. In this case, the load floats from

current value is the same as for circuit 7 above:

[A]

2.5 V