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HA17432VUP

Shunt Regulator

Renesas Electronics 

HA17431 Series

Application Hints (cont.)

No.

Application Example

6 Constant voltage regulator circuit

VCC

R1

Q

Vout

R2

GND

Cf

R3

GND

7 Discharge type constant current circuit

VCC

R

Q

GND

2.5 V

RS

+

IL

–

Description

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

output voltage

Vout = 2.5 V × (R2 + R3)

R3

R1 is a bias resistance for supplying the HA17431 cathode current

and the output transistor Q base current.

This circuit supplies a constant current of

IL ≅

2.5 V

RS

[A] into the load. Caution is required

since the HA17431 cathode current is also superimposed on IL.

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

greater than Imin = 1 mA. The IL setting therefore must be on the

order of several mA or more.

8 Induction type constant current circuit

VCC

R

+

IL

–

Q

GND

2.5 V

RS

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

GND, but the HA17431 cathode current is not superimposed on IL,

so that IL can be kept small (1 mA or less is possible). The constant

current value is the same as for circuit 7 above:

IL ≅

2.5 V

RS

[A]

REJ03D0678-0300 Rev.3.00 Apr 03, 2007

Page 14 of 19

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