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HA17431VPJ Datasheet(PDF) 11 Page - Renesas Technology Corp

Part # HA17431VPJ
Description  Shunt Regulator
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HA17431VPJ Datasheet(HTML) 11 Page - Renesas Technology Corp

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HA17431VPJ/PJ/PAJ/FPJ/FPAJ/PNAJ/UPA, HA17432UPA
REJ03D0892-0100 Rev.1.00 Apr 03, 2007
Page 11 of 17
Application Examples
As shown in the figure on the right, this IC operates as an inverting amplifier, with the REF pin as input pin. The open-
loop voltage gain is given by the reciprocal of “reference voltage deviation by cathode voltage change” in the electrical
specifications, and is approximately 50 to 60 dB. The REF pin has a high input impedance, with an input current Iref of
3.8
µA Typ (V version: Iref = 2 µA Typ). The output impedance of the output pin K (cathode) is defined as dynamic
impedance ZKA, and ZKA is low (0.2 Ω) over a wide cathode current range. A (anode) is used at the minimum potential,
such as ground.
K
VCC
OUT
VEE
A
REF
VZ
≅ 2.5V
+
Figure 1 Operation Diagram
Application Hints
No.
Application Example
Description
1
Reference voltage generation circuit
K
R
CL
Vout
GND
Vin
GND
REF
A
This is the simplest reference voltage circuit. The value of the
resistance R is set so that cathode current IK ≥ 1 mA.
Output is fixed at Vout
≅ 2.5 V.
The external capacitor CL (CL ≥ 3.3 µF) is used to prevent oscillation
in normal applications.
2
Variable output shunt regulator circuit
K
R
CL
Vout
GND
Vin
GND
A
R1
R2
REF
Iref
This is circuit 1 above with variable output provided.
Vout
≅ 2.5 V ×
Here,
(R1 + R2)
R2
Since the reference input current Iref = 3.8
µA Typ (V version: Iref =
2
µA Typ) flows through R1, resistance values are chosen to allow
the resultant voltage drop to be ignored.


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