HA17431FP [HITACHI]
Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp.; 关于文件中提到的名字,如日立电器和日立XX的变化,瑞萨科技公司型号: | HA17431FP |
厂家: | HITACHI SEMICONDUCTOR |
描述: | Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp. |
文件: | 总26页 (文件大小:234K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
To all our customers
Regarding the change of names mentioned in the document, such as Hitachi
Electric and Hitachi XX, to Renesas Technology Corp.
The semiconductor operations of Mitsubishi Electric and Hitachi were transferred to Renesas
Technology Corporation on April 1st 2003. These operations include microcomputer, logic, analog
and discrete devices, and memory chips other than DRAMs (flash memory, SRAMs etc.)
Accordingly, although Hitachi, Hitachi, Ltd., Hitachi Semiconductors, and other Hitachi brand
names are mentioned in the document, these names have in fact all been changed to Renesas
Technology Corp. Thank you for your understanding. Except for our corporate trademark, logo and
corporate statement, no changes whatsoever have been made to the contents of the document, and
these changes do not constitute any alteration to the contents of the document itself.
Renesas Technology Home Page: http://www.renesas.com
Renesas Technology Corp.
Customer Support Dept.
April 1, 2003
Cautions
Keep safety first in your circuit designs!
1. Renesas Technology Corporation puts the maximum effort into making semiconductor products better
and more reliable, but there is always the possibility that trouble may occur with them. Trouble with
semiconductors may lead to personal injury, fire or property damage.
Remember to give due consideration to safety when making your circuit designs, with appropriate
measures such as (i) placement of substitutive, auxiliary circuits, (ii) use of nonflammable material or
(iii) prevention against any malfunction or mishap.
Notes regarding these materials
1. These materials are intended as a reference to assist our customers in the selection of the Renesas
Technology Corporation product best suited to the customer's application; they do not convey any
license under any intellectual property rights, or any other rights, belonging to Renesas Technology
Corporation or a third party.
2. Renesas Technology Corporation assumes no responsibility for any damage, or infringement of any
third-party's rights, originating in the use of any product data, diagrams, charts, programs, algorithms, or
circuit application examples contained in these materials.
3. All information contained in these materials, including product data, diagrams, charts, programs and
algorithms represents information on products at the time of publication of these materials, and are
subject to change by Renesas Technology Corporation without notice due to product improvements or
other reasons. It is therefore recommended that customers contact Renesas Technology Corporation
or an authorized Renesas Technology Corporation product distributor for the latest product information
before purchasing a product listed herein.
The information described here may contain technical inaccuracies or typographical errors.
Renesas Technology Corporation assumes no responsibility for any damage, liability, or other loss
rising from these inaccuracies or errors.
Please also pay attention to information published by Renesas Technology Corporation by various
means, including the Renesas Technology Corporation Semiconductor home page
(http://www.renesas.com).
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information contained herein.
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or system that is used under circumstances in which human life is potentially at stake. Please contact
Renesas Technology Corporation or an authorized Renesas Technology Corporation product distributor
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Any diversion or reexport contrary to the export control laws and regulations of Japan and/or the
country of destination is prohibited.
8. Please contact Renesas Technology Corporation for further details on these materials or the products
contained therein.
HA17431 Series
Shunt Regulator
ADE-204-049A (Z)
Rev.1
Sep. 2002
Description
The HA17431 series is temperature-compensated variable shunt regulators. The main application of these
products is in voltage regulators that provide a variable output voltage. The on-chip high-precision
reference voltage source can provide 1% accuracy in the V versions, which have a VKA max of 16 volts.
The HA17431VLP, which is provided in the MPAK-5 package, is designed for use in switching mode
power supplies. It provides a built-in photocoupler bypass resistor for the PS pin, and an error amplifier
can be easily constructed on the supply side.
Features
•
•
•
•
The V versions provide 2.500 V 1% at Ta = 25°C
The HA17431VLP includes a photocoupler bypass resistor (2 kΩ)
The reference voltage has a low temperature coefficient
The MPAK-5(5-pin), MPAK(3-pin) and UPAK miniature packages are optimal for use on high
mounting density circuit boards
•
Car use is provided
Block Diagram
K
PS*
2kΩ
+
−
REF
2.500V
A
Note: * The PS pin is only provided by the HA17431VLP.
HA17431 Series
Application Circuit Example
Switching power supply secondary-side error amplification circuit
Vout
R
R1
+
–
K
A
PS
2kΩ
REF
R2
GND
HA17431VLP
Ordering Information
Version
Operating
Temperature
Range
Normal
Version
Item
Package
V Version
1ꢀ
A Version
2ꢁ2ꢀ
Reference
voltage
(at 25°C)
Accuracy
Max
4ꢀ
2ꢁ525 V
2ꢁ550 V
2ꢁ595 V
2ꢁ495 V
2ꢁ395 V
40 V max
Typ
2ꢁ500 V
2ꢁ495 V
Min
2ꢁ475 V
2ꢁ440 V
Cathode voltage
Cathode current
Car use
16 V max
50 mA max
HA17431VPJ
40 V max
150 mA max
150 mA max
TO-92
–40 to +85°C
HA17431PNAJ
HA17431PAJ
TO-92MOD
FP-8D
HA17431PJ
HA17431FPAJ
HA17431FPJ
Rev.1, Sep. 2002, page 2 of 24
HA17431 Series
Ordering Information (cont.)
Version
Operating
Temperature
Range
Normal
Version
Item
Package
V Version
A Version
Industrial use
HA17431VLTP
HA17432VLTP
HA17431VLP
HA17431VP
MPAK
–20 to +85°C
MPAK-5
TO-92
HA17431PNA
HA17431UPA
HA17431VUP
HA17432VUP
UPAK
HA17432UPA
HA17431PA
TO-92MOD
FP-8D
HA17431P
HA17431FPA
HA17431FP
Commercial use
HA17431UA
HA17432UA
UPAK
Pin Arrangement
MPAK-5
MPAK
(HA17431VLTP)
MPAK
(HA17432VLTP)
UPAK
UPAK
(HA17431UA/UPA/VUP)
(HA17432UA/UPA/VUP)
A
A
NC
PS
A
3
A
5
4
3
3
1
2
1
REF
2
1
2
1
REF
2
3
1
2
3
REF
REF A
K
K
K
REF
A
K
K
A
FP-8D
TO-92
TO-92MOD
Mark side
REF NC
A
6
NC
5
8
7
Mark side
1
2
3
1
2
3
1
2
3
4
K
NC NC NC
REF A
K
REF A
K
Revꢁ1, Sepꢁ 2002, page 3 of 24
HA17431 Series
Absolute Maximum Ratings
(Ta = 25°C)
Item
Symbol HA17431VLP
HA17431VP
HA17431VPJ
Unit
V
Notes
1
Cathode voltage
PS termꢁ voltage
VKA
VPS
IK
16
16
16
VKA to 16
–50 to +50
—
—
V
1,2,3
Continuous
–50 to +50
–50 to +50
mA
cathode current
Reference input
current
Iref
–0ꢁ05 to +10
–0ꢁ05 to +10
–0ꢁ05 to +10
mA
Power dissipation PT
150 *4
500 *5
500 *5
mW
4, 5
Operating
temperature
range
Topr
–20 to +85
–20 to +85
–40 to +85
°C
Storage
Tstg
–55 to +150
–55 to +150
–55 to +150
°C
temperature
Item
Symbol HA17431VUP/HA17432VUP
HA17431VLTP/HA17432VLTP
Unit
V
Notes
1
Cathode voltage
PS termꢁ voltage
VKA
VPS
IK
16
16
—
—
V
1,2,3
Continuous
–50 to +50
–50 to +50
mA
cathode current
Reference input
current
Iref
–0ꢁ05 to +10
–0ꢁ05 to +10
mA
Power dissipation PT
800 *8
150 *4
mW
4, 8
Operating
temperature
range
Topr
–20 to +85
–20 to +85
°C
Storage
Tstg
–55 to +150
–55 to +150
°C
temperature
HA17431UA/UPA/
Item
Symbol HA17431PNA HA17431P/PA HA17431FP/FPA HA17432UA/UPA
Unit
V
Notes
VKA
IK
40
40
40
40
1
Cathode voltage
–100 to +150
–100 to +150
–100 to +150
–100 to +150
mA
Continuous
cathode current
Iref
–0ꢁ05 to +10
–0ꢁ05 to +10
–0ꢁ05 to +10
–0ꢁ05 to +10
mA
Reference input
current
PT
500 *5
800 *6
500 *7
800 *8
mW
5,6,7,8
Power dissipation
Topr
–20 to +85
–20 to +85
–20 to +85
–20 to +85
°C
Operating
temperature
range
Tstg
–55 to +150
–55 to +150
–55 to +125
–55 to +150
°C
Storage
temperature
Revꢁ1, Sepꢁ 2002, page 4 of 24
HA17431 Series
Absolute Maximum Ratings (cont.)
(Ta = 25°C)
Item
Symbol HA17431PNAJ
HA17431PJ/PAJ
40
HA17431FPJ/FPAJ
40
Unit
V
Notes
Cathode voltage
VKA
IK
40
1
Continuous
–100 to +150
–100 to +150
–100 to +150
mA
cathode current
Reference input
current
Iref
–0ꢁ05 to +10
–0ꢁ05 to +10
–0ꢁ05 to +10
mA
Power dissipation PT
500 *5
800 *6
500 *7
mW
5,6,7
Operating
temperature
range
Topr
–40 to +85
–40 to +85
–40 to +85
°C
Storage
Tstg
–55 to +150
–55 to +150
–55 to +125
°C
temperature
Notes: 1ꢁ Voltages are referenced to anodeꢁ
2ꢁ The PS pin is only provided by the HA17431VLPꢁ
3ꢁ The PS pin voltage must not fall below the cathode voltageꢁ If the PS pin is not used, the PS pin
is recommended to be connected with the cathodeꢁ
4ꢁ Ta ≤ 25°Cꢁ If Ta > 25°C, derate by 1ꢁ2 mW/°Cꢁ
5ꢁ Ta ≤ 25°Cꢁ If Ta > 25°C, derate by 4ꢁ0 mW/°Cꢁ
6ꢁ Ta ≤ 25°Cꢁ If Ta > 25°C, derate by 6ꢁ4 mW/°Cꢁ
7ꢁ 50 mm × 50 mm × 1ꢁ5mmt glass epoxy board(5ꢀ wiring density), Ta ≤ 25°Cꢁ If Ta > 25°C,
derate by 5 mW/°Cꢁ
8ꢁ 15 mm × 25 mm × 0ꢁ7mmt alumina ceramic board,Ta ≤ 25°Cꢁ If Ta > 25°C, derate by 6ꢁ4
mW/°Cꢁ
Revꢁ1, Sepꢁ 2002, page 5 of 24
HA17431 Series
Electrical Characteristics
HA17431VLP/VP/VPJ/VUP/VLTP, HA17432VUP/VLTP
(Ta = 25°C, IK = 10 mA)
Item
Symbol
Vref
Min
2ꢁ475
—
Typ
2ꢁ500
10
Max
2ꢁ525
—
Unit
V
Test Conditions
Notes
Reference voltage
VKA = Vref
Reference voltage
temperature
deviation
Vref(dev)
mV
VKA = Vref,
1
Ta = –20°C to +85°C
Reference voltage
temperature
∆Vref/∆Ta
—
30
—
ppm/°C VKA = Vref,
0°C to 50°C gradient
coefficient
Reference voltage
regulation
∆Vref/∆VKA
Iref
—
—
—
2ꢁ0
2
3ꢁ7
6
mV/V
µA
VKA = Vref to 16 V
Reference input
current
R1 = 10 kΩ, R2 = ∞
Reference current
temperature
deviation
Iref(dev)
0ꢁ5
—
µA
R1 = 10 kΩ, R2 = ∞,
Ta = –20°C to +85°C
Minimum cathode
current
Imin
Ioff
ZKA
—
—
—
0ꢁ4
1ꢁ0
1ꢁ0
0ꢁ5
mA
µA
Ω
VKA = Vref
2
Off state cathode
current
0ꢁ001
0ꢁ2
VKA = 16 V, Vref = 0 V
Dynamic
impedance
VKA = Vref,
IK = 1 mA to 50 mA
Bypass resistance
RPS
1ꢁ6
2ꢁ0
2ꢁ4
kΩ
IPS = 1 mA
3
3
Bypass resistance
temperature
∆RPS/∆Ta
—
+2000
—
ppm/°C IPS = 1 mA,
0°C to 50°C gradient
coefficient
Revꢁ1, Sepꢁ 2002, page 6 of 24
HA17431 Series
Electrical Characteristics (cont.)
HA17431PJ/PAJ/FPJ/FPAJ/P/PA/UA/UPA/FP/FPA/PNA/PNAJ, HA17432UA/UPA
(Ta = 25°C, IK = 10 mA)
Item
Symbol
Min
Typ
Max
Unit
Test Conditions
Notes
A
Reference voltage
Vref
2ꢁ440
2ꢁ395
—
2ꢁ495
2ꢁ495
11
2ꢁ550
2ꢁ595
(30)
V
VKA = Vref
Normal
1, 4
Reference voltage
temperature
deviation
Vref(dev)
mV
VKA = Vref Ta =
–20°C to
+85°C
—
5
(17)
Ta = 0°C
to +70°C
1, 4
Reference voltage
regulation
∆Vref/∆VKA
—
—
—
1ꢁ4
1
3ꢁ7
2ꢁ2
6
mV/V
VKA = Vref to 10 V
VKA = 10 V to 40 V
R1 = 10 kΩ, R2 = ∞
Reference input
current
Iref
3ꢁ8
µA
µA
Reference current
temperature
deviation
Iref(dev)
—
0ꢁ5
(2ꢁ5)
R1 = 10 kΩ, R2 = ∞,
Ta = 0°C to +70°C
4
2
Minimum cathode
current
Imin
Ioff
ZKA
—
—
—
0ꢁ4
1ꢁ0
1ꢁ0
0ꢁ5
mA
µA
Ω
VKA = Vref
Off state cathode
current
0ꢁ001
0ꢁ2
VKA = 40 V, Vref = 0 V
Dynamic
impedance
VKA = Vref,
IK = 1 mA to 100 mA
Notes: 1ꢁ Vref(dev) = Vref(max) – Vref(min)
Vref(max)
Vref(dev)
Vref(min)
Ta Max
Ta Min
2ꢁ Imin is given by the cathode current at Vref = Vref(IK=10mA) – 15 mVꢁ
3ꢁ RPS is only provided in HA17431VLPꢁ
4ꢁ The maximum value is a design value (not measured)ꢁ
Revꢁ1, Sepꢁ 2002, page 7 of 24
HA17431 Series
MPAK-5(5-pin), MPAK(3-pin) and UPAK Marking Patterns
The marking patterns shown below are used on MPAK-5, MPAK and UPAK products. Note that the
product code and mark pattern are different. The pattern is laser-printed.
HA17431VLP
HA17431VLTP
HA17432VLTP
HA17431UA
HA17431UPA
NC
PS
A
A
REF
A
REF
A
4
A
4
B
(1)
(2)
P
(b)
(4)
(1)
3
(2)
A
(b)
(4)
(c)
(1)
3
(2)
B
(b)
(4)
(c)
(1)
(2)
(1)
(2)
4
A
A
(a)
(c)
(a)
(a)
Band mark
K
Band mark
K
REF
A
K
REF
K
K
REF
(3)
(4)
(5)
(3)
(4)
(5)
HA17432UA
HA17432UPA
HA17431VUP
HA17432VUP
K
A
K
A
REF
K
4
C
4
F
4
R
4
S
(1)
(2)
(1)
(2)
(1)
(2)
(1)
(2)
A
A
A
A
A
A
Band mark
REF
Band mark
REF
Band mark
K
Band mark
REF
(3)
(4)
(5)
(3)
(4)
(5)
(3)
(4)
(5)
(3)
(4)
(5)
Notes: 1ꢁ Boxes (1) to (5) in the figures show the position of the letters or numerals, and are not actually
marked on the packageꢁ
2ꢁ The letters (1) and (2) show the product specific mark patternꢁ
Product
(1)
4
(2)
P
R
S
A
B
A
B
C
F
HA17431VLP
HA17431VUP
HA17432VUP
HA17431VLTP
HA17432VLTP
HA17431UA
HA17431UPA
HA17432UA
HA17432UPA
4
4
3
3
4
4
4
4
3ꢁ The letter (3) shows the production year code (the last digit of the year) for UPAK productsꢁ
4ꢁ The bars (a), (b) and (c) show a production year code for MPAK-5 and MPAK products as shown
belowꢁ After 2010 the code is repeated every 8 yearsꢁ
Year
(a)
2002
None
None
Bar
2003
None
Bar
2004
None
Bar
2005
Bar
2006
Bar
2007
Bar
2008
Bar
2009
None
None
None
(b)
None
None
None
Bar
Bar
Bar
(c)
None
Bar
None
Bar
5ꢁ The letter (4) shows the production month code (see table below)ꢁ
Production month
Marked code
Janꢁ Febꢁ Marꢁ Aprꢁ Mayꢁ Junꢁ Julꢁ Augꢁ Sepꢁ Octꢁ
Novꢁ Decꢁ
A
B
C
D
E
F
G
H
J
K
L
M
6ꢁ The letter (5) shows manufacturing codeꢁ For UPAK productsꢁ
Revꢁ1, Sepꢁ 2002, page 8 of 24
HA17431 Series
Characteristics Curves
HA17431VLP/VP/VPJ/VUP/VLTP, HA17432VUP/VLTP
Reference Voltage Temperature Characteristics
2ꢁ575
V =Vref
K
I =10mA
K
2ꢁ550
2ꢁ525
2.500
2ꢁ475
2ꢁ450
2ꢁ425
K
A
V
I
Vref
K
REF
–20
0
20
40
60
80 85
Ambient temperature Ta (˚C)
Cathode Current vs. Cathode Voltage Characteristics 1
1.0
Cathode Current vs. Cathode Voltage Characteristics 2
50
V =Vref
K
V =Vref
K
0.5
0
0
–50
0
1
2
3
4
5
–5
0
5
1V/DIV
1V/DIV
Cathode voltage VK (V)
Cathode voltage VK (V)
Revꢁ1, Sepꢁ 2002, page 9 of 24
HA17431 Series
Dynamic Impedance vs. Frequency Characteristics
100
10
K
A
V
V
K
I
io
K
REF
1
0.1
i
= 2 mA
P-P
O
V
K
Z
=
(Ω)
KA
i
O
0.01
100
1k
10k
100k
1M
Frequency f (Hz)
Open Loop Voltage Gain, Phase vs. Frequency Characteristics
0
220Ω
Vo
∅
50
I =10mA
K
15kΩ
10µF
K
A
–
+
GVOL
REF
–180
–360
Vi
8.2kΩ
0
Vo
Vi
G = 20log
(dB)
100
1k
10k
100k
1M
10M
Frequency f (Hz)
Rev.1, Sep. 2002, page 10 of 24
HA17431 Series
HA17431PJ/PAJ/FPJ/FPAJ/P/PA/UA/UPA/FP/FPA/PNA/PNAJ, HA17432UA/UPA
Oscillation Stability vs. Load Capacitance between Anode and Cathode
1.5
150
Oscillation
region
Stable
region
100
50
0
V
CC
C
L
0.0001
0.001
0.01
0.1
1.0 2.0
Load capacitance CL (µF)
Open Loop Voltage Gain, Phase vs. Frequency Characteristics (1)
(With no feedback capacitance)
60
GV
IK = 10 mA
50
0
40
φ
30
20
10
0
90
220 Ω
15 kΩ
10 µF
Vout
180
Vin
8.2 kΩ GND
10
100
1 k
10 k
100 k
Frequency f (Hz)
Open Loop Voltage Gain, Phase vs. Frequency Characteristics (2)
(When a feedback capacitance (Cf) is provided)
IK = 5 mA
10
Gυ
Gυ
8
5
180
Cf = 0.022 µF
φ
Cf = 0.22 µF
270
360
2 k
Vout
+
Cf
0
200 µF
20 V
2.4 kΩ
–
Vin
GND
50 Ω
–4
10
100
1 k
10 k
Frequency f (Hz)
Rev.1, Sep. 2002, page 11 of 24
HA17431 Series
Reference Voltage Pin Input Current vs. Cathode Voltage Characteristics
2.5
2.0
1.5
1.0
IK = 10 mA
0.5
0
5
10
15
20
25
30
35
40
Cathode voltage VK (V)
Reference Voltage Temperature Characteristics
2.50
Pulse Response
INPUT
(P.G)
5
4
3
2
1
VKA = Vref
IK = 10 mA
2.49
2.48
2.47
2.46
2.45
2.44
OUTPUT
(Vout)
220 Ω
50 Ω
Vout
GND
P.G
f = 100 kHz
0
1
2
3
4
5
6
–20
0
20
40
60
80 85
Time t (µs)
Ambient temperature Ta (˚C)
Rev.1, Sep. 2002, page 12 of 24
HA17431 Series
Reference Voltage Pin Input Current
Temperature Characteristics
Cathode Current vs. Cathode Voltage Characteristics (1)
150
3
2.5
2
R1 = 10 kΩ
R2 = ∞
120
100
80
IK = 10 mA
60
40
1.5
1
20
0
–20
VK = Vref
Ta = 25˚C
–40
0.5
–60
–80
0
–20
–100
0
20
40
60
80 85
–2 –1
0
1
2
3
Ambient temperature Ta (˚C)
Cathode voltage VK (V)
Cathode Current Temperature Characteristics
Cathode Current vs. Cathode Voltage Characteristics (2)
1.2
when Off State
2
VKA = 40 V
Vref = 0
VKA = Vref
Ta = 25˚C
1.0
0.8
0.6
1.5
Imin
0.4
1
0.2
0.5
–20
0
1
2
3
0
20
40
60
80 85
Cathode voltage VK (V)
Ambient temperature Ta (˚C)
Rev.1, Sep. 2002, page 13 of 24
HA17431 Series
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
REF
VCC
–
OUT
+
VEE
VZ ≅ 2.5V
A
Figure 1 Operation Diagram
Application Hints
No.
Application Example
Reference voltage generation circuit
Description
1
This is the simplest reference voltage circuit. The value
of the resistance R is set so that cathode current IK ≥ 1
Vin
Vout
mA.
R
K
A
Output is fixed at Vout ≅ 2.5 V.
CL
GND
REF
The external capacitor CL (CL ≥ 3.3 µF) is used to
prevent oscillation in normal applications.
GND
2
Variable output shunt regulator circuit
This is circuit 1 above with variable output provided.
Vin
Vout
(R1 + R2)
Here, Vout ≅ 2.5 V ×
R2
R
Iref
R1
R2
K
A
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.
CL
REF
GND
GND
Rev.1, Sep. 2002, page 14 of 24
HA17431 Series
Application Hints (cont.)
No.
Application Example
Description
3
Single power supply inverting
comparator circuit
This is an inverting type comparator with an input
threshold voltage of approximately 2.5 V. Rin is the
REF pin protection resistance, with a value of several
kΩ to several tens of kΩ.
VCC
RL
RL is the load resistance, selected so that the cathode
current IK • 1 mA when Vout is low.
Vout
Rin
K
A
Vin
Condition Vin
Vout
IC
REF
C1
C2
Less then 2.5 V
2.5 V or more
VCC (VOH
)
OFF
ON
GND
GND
Approx. 2 V (VOL
)
4
AC amplifier circuit
Cf
This is an AC amplifier with voltage gain G = –R1 /
(R2//R3). The input is cut by capacitance Cin, so that
the REF pin is driven by the AC input signal, centered
on 2.5 VDC.
VCC
RL
R1
R2 also functions as a resistance that determines the
DC cathode potential when there is no input, but if the
input level is low and there is no risk of Vout clipping to
VCC, this can be omitted.
Vout
K
A
Cin
R3
Vin
REF
To change the frequency characteristic, Cf should be
connected as indicated by the dotted line.
R2
GND
R1
R2 // R3
Gain G =
(DC gain)
1
Cutoff frequency fc =
2π Cf (R1 // R2 // R3)
5
Switching power supply error
amplification circuit
This circuit performs control on the secondary side of a
transformer, and is often used with a switching power
supply that employs a photocoupler for offlining.
+
The output voltage (between V+ and V–) is given by the
V
R4
+
following formula:
R3
Cf
LED
–
(R1 + R2)
Vout ≅ 2.5 V ×
R2
R1
(Note)
In this circuit, the gain with respect to the Vout error is
as follows:
Secondary
side GND
R2
R2
(R1 + R2)
HA17431 open
loop gain
photocoupler
total gain
G =
×
×
–
V
As stated earlier, the HA17431 open-loop gain is 50 to
60 dB.
Note: LED : Light emitting diode in photocoupler
R3 : Bypass resistor to feed IK(>Imin)
when LED current vanishes
R4 : LED protection resistance
Rev.1, Sep. 2002, page 15 of 24
HA17431 Series
Application Hints (cont.)
No.
Application Example
Description
6
Constant voltage regulator circuit
This is a 3-pin regulator with a discrete configuration, in
which the output voltage
VCC
R1
Q
(R2 + R3)
Vout = 2.5 V ×
R3
R1 is a bias resistance for supplying the HA17431
cathode current and the output transistor Q base
current.
Vout
R2
Cf
R3
GND
GND
7
Discharge type constant current circuit
This circuit supplies a constant current of
2.5 V
IL ≅
[A] into the load. Caution is required
VCC
R
RS
Q
since the HA17431 cathode current is also
superimposed on IL.
2.5 V
RS
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.
+
IL
GND
–
8
Induction type constant current circuit
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:
+
VCC
IL
R
–
Q
2.5 V
IL ≅
[A]
RS
2.5 V
RS
GND
Rev.1, Sep. 2002, page 16 of 24
HA17431 Series
Design Guide for AC-DC SMPS (Switching Mode Power Supply)
Use of Shunt Regulator in Transformer Secondary Side Control
This example is applicable to both forward transformers and flyback transformers. A shunt regulator is
used on the secondary side as an error amplifier, and feedback to the primary side is provided via a
photocoupler.
Transformer
R1
SBD
PWM IC
HA17384
HA17385
IF
(+)
Output
R3
R2
IB
V0
(–)
VF
Light
Vref
VK
R5
REF
Phototransistor
Photocoupler
C1
emitting diode
K
R4
A
HA17431
GND
Figure 2 Typical Shunt Regulator/Error Amplifier
Determination of External Constants for the Shunt Regulator
DC characteristic determination: In figure 2, R1 and R2 are protection resistor for the light emitting diode
in the photocoupler, and R2 is a bypass resistor to feed IK minimum, and these are determined as shown
below. The photocoupler specification should be obtained separately from the manufacturer. Using the
parameters in figure 2, the following formulas are obtained:
V0 – VF – VK
VF
IB
R1 =
, R2 =
IF + IB
VK is the HA17431 operating voltage, and is set at around 3 V, taking into account a margin for fluctuation.
R2 is the current shunt resistance for the light emitting diode, in which a bias current IB of around 1/5 IF
flows.
Next, the output voltage can be determined by R3 and R4, and the following formula is obtained:
R3 + R4
V0 =
× Vref, Vref = 2.5 V Typ
R4
The absolute values of R3 and R4 are determined by the HA17431 reference input current Iref and the AC
characteristics described in the next section. The Iref value is around 3.8 µA Typ. (V version: 2 µA Typ)
Rev.1, Sep. 2002, page 17 of 24
HA17431 Series
AC characteristic determination: This refers to the determination of the gain frequency characteristic of
the shunt regulator as an error amplifier. Taking the configuration in figure 2, the error amplifier
characteristic is as shown in figure 3.
G1
G2
When R5 ≠ 0
When R5 = 0
f1 fAC
f2
fOSC
Frequency f (Hz)
* fOSC : PWM switching frequency
Figure 3 HA17431 Error Amplification Characteristic
In Figure 3, the following formulas are obtained:
Gain
G1 = G0 ≈ 50 dB to 60 dB (determined by shunt regulator)
R5
G2 =
R3
Corner frequencies
f1 = 1/(2π C1 G0 R3)
f2 = 1/(2π C1 R5)
G0 is the shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage fluctuation
∆Vref/∆VKA, and is approximately 50 dB.
Rev.1, Sep. 2002, page 18 of 24
HA17431 Series
Practical Example
Consider the example of a photocoupler, with an internal light emitting diode VF = 1.05 V and IF = 2.5 mA,
power supply output voltage V2 = 5 V, and bias resistance R2 current of approximately 1/5 IF at 0.5 mA. If
the shunt regulator VK = 3 V, the following values are found.
5V – 1.05V – 3V
2.5mA + 0.5mA
R1 =
R2 =
= 316(Ω) (330Ω from E24 series)
1.05V
0.5mA
= 2.1(kΩ) (2.2kΩ from E24 series)
Next, assume that R3 = R4 = 10 kΩ. This gives a 5 V output. If R5 = 3.3 kΩ and C1 = 0.022 µF, the
following values are found.
G2 = 3.3 kΩ / 10 kΩ = 0.33 times (–10 dB)
f1 = 1 / (2 × π × 0.022 µF × 316 × 10 kΩ) = 2.3 (Hz)
f2 = 1 / (2 × π × 0.022 µF × 3.3 kΩ) = 2.2 (kHz)
Rev.1, Sep. 2002, page 19 of 24
HA17431 Series
Package Dimensions
As of January, 2002
Unit: mm
+ 0.10
– 0.06
+ 0.10
– 0.05
0.16
0.4
0 – 0.1
0.95
0.95
1.9 0.ꢀ
ꢀ.95 0.ꢀ
Hitachi Code
JEDEC
MPAK
—
JEITA
Mass (reference value)
Conforms
0.011 g
As of January, 2002
Unit: mm
1.9 0.2
+ 0.1
– 0.05
0.95
0.95
0.16
0 – 0.1
+ 0.1
– 0.05
5 – 0.4
2.9 0.2
Hitachi Code
JEDEC
MPAK-5
—
JEITA
—
Mass (reference value)
0.015 g
Rev.1, Sep. 2002, page 20 of 24
HA17431 Series
As of January, 2002
Unit: mm
4.5 0.1
1.8 Max
1.5 0.1
0.44 Max
(1.5)
φ
1
0.53 Max
0.48 Max
0.44 Max
1.5
1.5
3.0
Hitachi Code
JEDEC
UPAK
—
JEITA
Mass (reference value)
Conforms
0.050 g
As of January, 2002
Unit: mm
4.85
5.25 Max
5
8
1
4
+ 0.25
6.50
– 0.15
0.75 Max
1.05
0˚ – 8˚
+ 0.25
0.60
– 0.18
1.27
*0.42 0.08
0.40 0.06
0.15
M
0.12
Hitachi Code
JEDEC
FP-8D
—
JEITA
Mass (reference value)
Conforms
0.10 g
*Dimension including the plating thickness
Base material dimension
Rev.1, Sep. 2002, page 21 of 24
HA17431 Series
As of January, 2002
Unit: mm
4.8 0.ꢀ
ꢀ.8 0.ꢀ
0.60 Max
0.55 Max
0.5 Max
1.27
2.54
Hitachi Code
JEDEC
JEITA
TO-92 (1)
Conforms
Conforms
0.25 g
Mass (reference value)
Rev.1, Sep. 2002, page 22 of 24
HA17431 Series
As of January, 2002
Unit: mm
4.8 0.4
ꢀ.8 0.4
0.65 0.1
0.75 Max
0.60 Max
0.55 Max
0.5 Max
1.27
2.54
Hitachi Code
JEDEC
TO-92 Mod
—
JEITA
Mass (reference value)
Conforms
0.ꢀ5 g
Rev.1, Sep. 2002, page 2ꢀ of 24
HA17431 Series
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copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as fail-
safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
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Copyright © Hitachi, Ltd., 2002. All rights reserved. Printed in Japan.
Colophon 6.0
Rev.1, Sep. 2002, page 24 of 24
相关型号:
HA17431FPA
Regarding the change of names mentioned in the document, such as Hitachi Electric and Hitachi XX, to Renesas Technology Corp.
HITACHI
HA17431FPA-E
1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.495V, PDSO8, 4.40 X 4.85 MM, 1.27 MM PITCH, PLASTIC, SOP-8
RENESAS
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