HA17431FPAJ RENESAS [Renesas Technology Corp], HA17431FPAJ Datasheet - Page 13

• Manufacturer Part Number: HA17431FPAJ
• Description: Shunt Regulator
• Manufacturer: RENESAS [Renesas Technology Corp]

HA17431VPJ/PJ/PAJ/FPJ/FPAJ/PNAJ/UPA, HA17432UPA
Application Hints (cont.)
REJ03D0892-0100 Rev.1.00 Apr 03, 2007
Page 13 of 17
No.
6
7
8
Constant voltage regulator circuit
GND
Discharge type constant current circuit
V
GND
Induction type constant current circuit
V
GND
V
CC
CC
CC
R
1
Application Example
Cf
R
R
2.5 V
2.5 V
R
R
Q
+
–
2
3
R
R
+
–
Q
Q
S
S
Vout
GND
I
I
L
L
This is a 3-pin regulator with a discrete configuration, in which the
output voltage
Vout = 2.5 V ×
R
and the output transistor Q base current.
This circuit supplies a constant current of
I
since the HA17431 cathode current is also superimposed on I
The requirement in this circuit is that the cathode current must be
greater than Imin = 1 mA. The I
order of several mA or more.
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 I
so that I
current value is the same as for circuit 7 above:
I
L
L
1
≅
≅
is a bias resistance for supplying the HA17431 cathode current
2.5 V
2.5 V
R
R
S
S
L
can be kept small (1 mA or less is possible). The constant
[A] into the load. Caution is required
[A]
(R
2
R
+ R
3
3
)
Description
L
setting therefore must be on the
L
.
L
,