HA17431FPA [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：	HA17431FPA
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. 关于文件中提到的名字，如日立电器和日立XX的变化，瑞萨科技公司光电二极管
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

when considering the use of a product contained herein for any specific purposes, such as apparatus or

systems for transportation, vehicular, medical, aerospace, nuclear, or undersea repeater use.

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whole or in part these materials.

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exported under a license from the Japanese government and cannot be imported into a country other

than the approved destination.

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 V_KAmax 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

PS*

2kΩ

−

REF

2.500V

Note: * The PS pin is only provided by the HA17431VLP.

HA17431 Series

Application Circuit Example

Switching power supply secondary-side error amplification circuit

Vout

R₁

–

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

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

(HA17431UA/UPA/VUP)

(HA17432UA/UPA/VUP)

REF

REF A

REF

FP-8D

TO-92

TO-92MOD

Mark side

REF NC

Mark side

NC NC NC

REF A

Revꢁ1, Sepꢁ 2002, page 3 of 24

HA17431 Series

Absolute Maximum Ratings

(Ta = 25°C)

Item

Symbol HA17431VLP

HA17431VP

HA17431VPJ

Unit

Notes

Cathode voltage

PS termꢁ voltage

V_KA

V_PS

I_K

V_KAto 16

–50 to +50

—

1,2,3

Continuous

–50 to +50

cathode current

Reference input

current

Iref

–0ꢁ05 to +10

Power dissipation P_T

150 *⁴

500 *⁵

4, 5

Operating

temperature

range

Topr

–20 to +85

–40 to +85

°C

Storage

Tstg

–55 to +150

°C

temperature

Item

Symbol HA17431VUP/HA17432VUP

HA17431VLTP/HA17432VLTP

Unit

Notes

Cathode voltage

PS termꢁ voltage

V_KA

V_PS

I_K

—

1,2,3

Continuous

–50 to +50

cathode current

Reference input

current

Iref

–0ꢁ05 to +10

Power dissipation P_T

800 *⁸

150 *⁴

4, 8

Operating

temperature

range

Topr

–20 to +85

°C

Storage

Tstg

–55 to +150

°C

temperature

HA17431UA/UPA/

Item

Symbol HA17431PNA HA17431P/PA HA17431FP/FPA HA17432UA/UPA

Unit

Notes

V_KA

I_K

Cathode voltage

–100 to +150

Continuous

cathode current

Iref

–0ꢁ05 to +10

Reference input

current

P_T

500 *⁵

800 *⁶

500 *⁷

800 *⁸

5,6,7,8

Power dissipation

Topr

–20 to +85

°C

Operating

temperature

range

Tstg

–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

HA17431FPJ/FPAJ

Unit

Notes

Cathode voltage

V_KA

I_K

Continuous

–100 to +150

cathode current

Reference input

current

Iref

–0ꢁ05 to +10

Power dissipation P_T

500 *⁵

800 *⁶

500 *⁷

5,6,7

Operating

temperature

range

Topr

–40 to +85

°C

Storage

Tstg

–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, I_K= 10 mA)

Item

Symbol

Vref

Min

2ꢁ475

—

Typ

2ꢁ500

Max

2ꢁ525

—

Unit

Test Conditions

Notes

Reference voltage

V_KA= Vref

Reference voltage

temperature

deviation

Vref(dev)

V_KA= Vref,

Ta = –20°C to +85°C

Reference voltage

temperature

∆Vref/∆Ta

—

ppm/°C V_KA= Vref,

0°C to 50°C gradient

coefficient

Reference voltage

regulation

∆Vref/∆V_KA

Iref

—

2ꢁ0

3ꢁ7

mV/V

µA

V_KA= 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

Z_KA

—

0ꢁ4

1ꢁ0

0ꢁ5

µA

Ω

V_KA= Vref

Off state cathode

current

0ꢁ001

0ꢁ2

V_KA= 16 V, Vref = 0 V

Dynamic

impedance

V_KA= Vref,

I_K= 1 mA to 50 mA

Bypass resistance

R_PS

1ꢁ6

2ꢁ0

2ꢁ4

kΩ

I_PS= 1 mA

Bypass resistance

temperature

∆R_PS/∆Ta

—

+2000

—

ppm/°C I_PS= 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, I_K= 10 mA)

Item

Symbol

Min

Typ

Max

Unit

Test Conditions

Notes

Reference voltage

Vref

2ꢁ440

2ꢁ395

—

2ꢁ495

2ꢁ550

2ꢁ595

(30)

V_KA= Vref

Normal

1, 4

Reference voltage

temperature

deviation

Vref(dev)

V_KA= Vref Ta =

–20°C to

+85°C

—

(17)

Ta = 0°C

to +70°C

1, 4

Reference voltage

regulation

∆Vref/∆V_KA

—

1ꢁ4

3ꢁ7

2ꢁ2

mV/V

V_KA= Vref to 10 V

V_KA= 10 V to 40 V

R₁= 10 kΩ, R₂= ∞

Reference input

current

Iref

3ꢁ8

µA

Reference current

temperature

deviation

Iref(dev)

—

0ꢁ5

(2ꢁ5)

R₁= 10 kΩ, R₂= ∞,

Ta = 0°C to +70°C

Minimum cathode

current

Imin

Ioff

Z_KA

—

0ꢁ4

1ꢁ0

0ꢁ5

µA

Ω

V_KA= Vref

Off state cathode

current

0ꢁ001

0ꢁ2

V_KA= 40 V, Vref = 0 V

Dynamic

impedance

V_KA= Vref,

I_K= 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 R_PSis 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

REF

(1)

(2)

(b)

(4)

(1)

(2)

(b)

(4)

(c)

(1)

(2)

(b)

(4)

(c)

(1)

(2)

(1)

(2)

(a)

(c)

(a)

Band mark

REF

(3)

(4)

(5)

(3)

(4)

(5)

HA17432UA

HA17432UPA

HA17431VUP

HA17432VUP

REF

(1)

(2)

(1)

(2)

(1)

(2)

(1)

(2)

Band mark

REF

Band mark

REF

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)

(2)

HA17431VLP

HA17431VUP

HA17432VUP

HA17431VLTP

HA17432VLTP

HA17431UA

HA17431UPA

HA17432UA

HA17432UPA

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

Bar

2003

None

Bar

2004

None

Bar

2005

Bar

2006

Bar

2007

Bar

2008

Bar

2009

None

(b)

None

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

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

I =10mA

2ꢁ550

2ꢁ525

2.500

2ꢁ475

2ꢁ450

2ꢁ425

Vref

REF

–20

80 85

Ambient temperature Ta (˚C)

Cathode Current vs. Cathode Voltage Characteristics 1

1.0

Cathode Current vs. Cathode Voltage Characteristics 2

V =Vref

0.5

–50

–5

1V/DIV

Cathode voltage V_K(V)

Revꢁ1, Sepꢁ 2002, page 9 of 24

HA17431 Series

Dynamic Impedance vs. Frequency Characteristics

100

REF

0.1

= 2 mA

P-P

(Ω)

0.01

100

10k

100k

Frequency f (Hz)

Open Loop Voltage Gain, Phase vs. Frequency Characteristics

220Ω

∅

I =10mA

15kΩ

10µF

–

G_VOL

REF

–180

–360

8.2kΩ

G = 20log

(dB)

100

10k

100k

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

0.0001

0.001

0.01

0.1

1.0 2.0

Load capacitance C_L(µF)

Open Loop Voltage Gain, Phase vs. Frequency Characteristics (1)

(With no feedback capacitance)

G_V

I_K= 10 mA

220 Ω

15 kΩ

10 µF

Vout

180

Vin

8.2 kΩ GND

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)

I_K= 5 mA

Gυ

180

Cf = 0.022 µF

Cf = 0.22 µF

270

360

2 k

Vout

200 µF

20 V

2.4 kΩ

–

Vin

GND

50 Ω

–4

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

I_K= 10 mA

0.5

Cathode voltage V_K(V)

Reference Voltage Temperature Characteristics

2.50

Pulse Response

INPUT

(P.G)

V_KA= Vref

I_K= 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

–20

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

2.5

R₁= 10 kΩ

R₂= ∞

120

100

I_K= 10 mA

1.5

–20

V_K= Vref

Ta = 25˚C

–40

0.5

–60

–80

–20

–100

80 85

–2 –1

Ambient temperature Ta (˚C)

Cathode voltage V_K(V)

Cathode Current Temperature Characteristics

Cathode Current vs. Cathode Voltage Characteristics (2)

1.2

when Off State

V_KA= 40 V

Vref = 0

V_KA= Vref

Ta = 25˚C

1.0

0.8

0.6

1.5

Imin

0.4

0.2

0.5

–20

80 85

Cathode voltage V_K(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 Z_KA, and Z_KAis low (0.2 Ω) over

a wide cathode current range. A (anode) is used at the minimum potential, such as ground.

REF

V_CC

–

OUT

V_EE

V_Z≅ 2.5V

Figure 1 Operation Diagram

Application Hints

No.

Application Example

Reference voltage generation circuit

Description

This is the simplest reference voltage circuit. The value

of the resistance R is set so that cathode current I_K≥ 1

Vin

Vout

mA.

Output is fixed at Vout ≅ 2.5 V.

C_L

GND

REF

The external capacitor C_L(C_L≥ 3.3 µF) is used to

prevent oscillation in normal applications.

GND

Variable output shunt regulator circuit

This is circuit 1 above with variable output provided.

Vin

Vout

(R₁+ R₂)

Here, Vout ≅ 2.5 V ×

R₂

Iref

R₁

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.

C_L

REF

GND

Rev.1, Sep. 2002, page 14 of 24

HA17431 Series

Application Hints (cont.)

No.

Application Example

Description

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.

V_CC

R_L

R_Lis the load resistance, selected so that the cathode

current I_K• 1 mA when Vout is low.

Vout

Rin

Vin

Condition Vin

Vout

REF

Less then 2.5 V

2.5 V or more

V_CC(V_OH

)

OFF

GND

Approx. 2 V (V_OL

)

AC amplifier circuit

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 V_DC.

V_CC

R_L

R₁

R₂also 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

V_CC, this can be omitted.

Vout

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)

Cutoff frequency fc =

2π Cf (R₁// R₂// R₃)

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

R₄

following formula:

R₃

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

(R₁+ R₂)

HA17431 open

loop gain

photocoupler

total gain

G =

–

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

Constant voltage regulator circuit

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

which the output voltage

V_CC

R₁

(R₂+ R₃)

Vout = 2.5 V ×

R₃

R₁is a bias resistance for supplying the HA17431

cathode current and the output transistor Q base

current.

Vout

R₂

R₃

GND

Discharge type constant current circuit

This circuit supplies a constant current of

2.5 V

I_L≅

[A] into the load. Caution is required

V_CC

R_S

since the HA17431 cathode current is also

superimposed on I_L.

2.5 V

R_S

The requirement in this circuit is that the cathode

current must be greater than Imin = 1 mA. The I_L

setting therefore must be on the order of several mA or

more.

I_L

GND

–

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 I_L, so that I_Lcan be kept small

(1 mA or less is possible). The constant current value

is the same as for circuit 7 above:

V_CC

I_L

–

2.5 V

I_L≅

[A]

R_S

2.5 V

R_S

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

I_F

(+)

Output

R₃

R₂

I_B

V₀

(–)

V_F

Light

Vref

V_K

R₅

REF

Phototransistor

Photocoupler

C₁

emitting diode

R₄

HA17431

GND

Figure 2 Typical Shunt Regulator/Error Amplifier

Determination of External Constants for the Shunt Regulator

DC characteristic determination: In figure 2, R₁and R₂are protection resistor for the light emitting diode

in the photocoupler, and R₂is a bypass resistor to feed I_Kminimum, 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– V_F– V_K

V_F

I_B

R₁=

, R₂=

I_F+ I_B

V_Kis the HA17431 operating voltage, and is set at around 3 V, taking into account a margin for fluctuation.

R₂is the current shunt resistance for the light emitting diode, in which a bias current I_Bof around 1/5 I_F

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 R₃and R₄are 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

f₁f_AC

f₂

f_OSC

Frequency f (Hz)

* f_OSC: 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 C₁G₀R₃)

f₂= 1/(2π C₁R₅)

G₀is the shunt regulator open-loop gain; this is given by the reciprocal of the reference voltage fluctuation

∆Vref/∆V_KA, 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 V_F= 1.05 V and I_F= 2.5 mA,

power supply output voltage V₂= 5 V, and bias resistance R₂current of approximately 1/5 I_Fat 0.5 mA. If

the shunt regulator V_K= 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

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

0.16

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)

0.53 Max

0.48 Max

0.44 Max

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

+ 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

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

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

Disclaimer

1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,

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.

Sales Offices

Hitachi, Ltd.

Semiconductor & Integrated Circuits

Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan

Tel: (03) 3270-2111 Fax: (03) 3270-5109

URL

http://www.hitachisemiconductor.com/

For further information write to:

Hitachi Semiconductor

(America) Inc.

Hitachi Europe Ltd.

Hitachi Asia Ltd.

Hitachi Asia (Hong Kong) Ltd.

Group III (Electronic Components)

7/F., North Tower

Electronic Components Group

Hitachi Tower

179 East Tasman Drive Whitebrook Park

16 Collyer Quay #20-00

Singapore 049318

Tel : <65>-6538-6533/6538-8577

Fax : <65>-6538-6933/6538-3877

URL : http://semiconductor.hitachi.com.sg

San Jose,CA 95134

Lower Cookham Road

World Finance Centre,

Tel: <1> (408) 433-1990 Maidenhead

Fax: <1>(408) 433-0223 Berkshire SL6 8YA, United Kingdom

Tel: <44> (1628) 585000

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Tsim Sha Tsui, Kowloon Hong Kong

Tel : <852>-2735-9218

Fax : <852>-2730-0281

URL : http://semiconductor.hitachi.com.hk

Fax: <44> (1628) 585200

Hitachi Asia Ltd.

(Taipei Branch Office)

4/F, No. 167, Tun Hwa North Road

Hung-Kuo Building

Taipei (105), Taiwan

Tel : <886>-(2)-2718-3666

Fax : <886>-(2)-2718-8180

Telex : 23222 HAS-TP

URL : http://www.hitachi.com.tw

Hitachi Europe GmbH

Electronic Components Group

Dornacher Straße 3

D-85622 Feldkirchen

Postfach 201, D-85619 Feldkirchen

Germany

Tel: <49> (89) 9 9180-0

Fax: <49> (89) 9 29 30 00

Colophon 6.0

Rev.1, Sep. 2002, page 24 of 24

HA17431FPA [HITACHI]

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