MB3788PFV - Fujitsu Quantum Devices Limited

DS04-27209-3E

FUJITSU SEMICONDUCTOR

DATA SHEET

ASSP

SWITCHING REGULATOR

CONTROLLER

MB3788

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■■

■DESCRIPTION

The MB3788 is a dual-channel PWM-type switching regulator controller; it incorporates a reference voltage.

The MB3788 has a PWM circuit and an output circuit as well as a reference v oltage po w er supply with a voltage

accuracy of ±1%. The maximum oper ating frequency is 1 MHz. It is designed for a v oltage-drop output s witching

regulator suitable for a logic power supply or speed control of a DC motor.

The MB3788 is compatible with all master ICs producing triangular wa v es , sa w-tooth wa v es and sine w a v es with

an amplitude of 1.3 V to 1.9 V.

It can be used in high-performance portable equipment such as a video camcorder or notebook personal computer

(word processor).

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■FEATURES

• Wide operating power supply voltage range: 3.6 V to 18 V

• Low power dissipation

• Operating: 1.9 mA (standard)

Standby: 10 µA Max

(Continued)

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■PACKAGE

This de vice contains circuitry to protect the inputs against damage due to high static voltages or electric fields. How ever, it is

advised that normal precautions be taken to a v oid application of an y v oltage higher than maximum r ated v oltages to this high

impedance circuit.

24-pin Plastic SSOP

(FPT-24P-M03)

MB3788

(Continued)

• High-frequency operation: 100 kHz to 1 MHz

• On-chip timer and latch-type short-circuit detection circuit

• Wide error amplifier input voltage range: -0.2 V to VCC - 1.8 V

• On-chip high-accuracy reference voltage circuit: 2.50 V ±1%

• Output circuit

PNP transistor drive output pin: Push-pull type

ON/OFF current values set independently

• On-chip standby function and output control function

• High-density packaging: SSOP-24P

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■PIN ASSIGNMENT

(TOP VIEW)

VCC(out)

OUT1

VE1

Cb1

Ca1

FB1

-IN1(E)

+IN1(E)

-IN1(C)

-IN(PWN)

VCC

VREF

GND

OUT2

VE2

Cb2

Ca2

FB2

-IN2(E)

+IN2(E)

-IN2(C)

SCP

CTL2

CTL1

(FPT-24P-M03)

MB3788

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■PIN DESCRIPTION

Note: The alphabetic characters in parenthesis above indicate the following input pins.

(C): Comparator

(E): Error amplifier

Pin No. Pin name I/O Descriptions

Channel 1

2OUT1O

Channel 1 push-pull type output

3VE1I

Channel 1 output current setting

4Ca1—

Channel 1 output transistor OFF current setting: Output transistor OFF

The current is set by connecting a capacitor between pins Ca1 and Cb1.

5Cb1—

6FB1O

Channel 1 error amplifier output

7-IN1(E)I

Channel 1 error amplifier inversion input

8+IN1(E) Channel 1 error amplifier non-inversion input

9-IN1(C)I

Channel 1 comparator inversion input

Channel 2

16 -IN2(C) I Channel 2 comparator inversion input

17 +IN2(E) I Channel 2 error amplifier non-inversion input

18 -IN2(E) I Channel 2 error amplifier inversion input

19 FB2 O Channel 2 error amplifier output

20 Ca2 — Channel 2 output transistor OFF current setting: Output transistor OFF

The current is set by connecting a capacitor between pins Ca2 and Cb2.

21 Cb2 —

22 VE2 I Channel 2 output current setting

23 OUT2 O Channel 2 push-pull type output

Control

circuit

13 CTL1 I Power and channel 1 control pin

H level: Power and channel 1 operating

L level: Standby

14 CTL2 I Channel 2 control pin

When CTL1 pin = H level,

H level: Channel 2 operating

L level: Channel 2 OFF

15 SCP — Short-circuit protection circuit capacitor connection

Power

circuit

1VCC2—Output circuit power pin

10 -IN(PWM) I Master oscillating waveform input

11 VCC1 —Reference power and control circuit power

12 VREF OReference voltage output

24 GND — Ground

MB3788

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■BLOCK DIAGRAM

Channel 1

-IN1 (E)

FB1

-IN1 (C)

+IN1 (E) 1

Ca1

VCC(out)

OUT1

Cb1

CTL2

VCC

CTL1

VE1

10 12 GND

-IN(PWM)

SCP

VREF

1.9 V

1.3 V

1.5 V

0.6 V

Error amplifier 1

Comparator 1

PWM comparator 1 OFF current setting

Channel 2

-IN2 (E)

FB2

-IN2 (C)

+IN2 (E)

Cb2

OUT2

Ca2

VE2

-1.5 V

0.6 V

Error amplifier 2

Comparator 2

PWM comparator 2 OFF current setting

SCP comparator

2.1 V

Low input

voltage

protection

circuit

SR latch

circuit

Reference

voltage

power (2.5 V)

Power/channel

ON/OFF

circuit

Timer circuit

1 µA

VREF

MB3788

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■FUNCTIONAL DESCRIPTION

1. Major Functions

(1) Reference voltage power circuit

The reference voltage power supply produces a ref erence voltage (≈ 2.50 V) which is temperature-compensated

by the voltage supplied from the power pin (pin 11); it is used as the IC internal circuit operating power supply.

The reference voltage can also be output externally at 1 mA from VREF pin (pin12).

(2) Error amplifier

The error amplifier detects the switching regulator output voltage and outputs a PWM control signal. It has a

wide in-phase input voltage range of -0.2 V to VCC - 1.8 V to make setting from an external power supply easy.

Connecting the output pin and inv ersion input pin of the error amplifier through a feedback resistor and capacitor

allows setting of any loop gain to provide stable phase compensation.

(3) PWM comparator

The PWM comparator controls the output pulse ON time according to the input voltage.

The v oltage input to the -IN pin (PWM) turns the output transistor on when it is low er than the output voltage of

the error amplifier.

(4) Output circuit

The output circuit is configured in a push-pull form and uses a PNP transistor drive system to drive a tr ansistor

of up to 30 mA. (See

How to Set Output Current.

)

2. Channel Control Function

Channels can be set ON/OFF by combining the voltage levels at pin CTL1 (pin 13) and pin CTL2 (pin 14).

Channel ON/OFF Setting Conditions

*: The power current in the standby state is 10 µA Max.

Voltage level at CTL pin Channel ON/OFF status

CTL1 CTL2 Power circuit Channel 1 Channel

L×Stand by state*

HH ON ON

LOFF

MB3788

3. Protection Functions

(1) Timer and latch-type short-circuit protection circuit

The SCP comparator detects the output voltage levels of two comparators to detect an output short circuit. If

the output voltage of one comparator increases to 2.1 V, the transistor of the timer circuit is tur ned off and the

short circuit protection capacitor connected externally to the SCP pin (pin 15) starts charging.

The latch circuit turns off the output transistor and simultaneously clears the duty cycle to 0 when the output

v oltage lev el of the comparator does not return to the normal voltage le v el until the capacitor voltage rises to the

base-emitter junction voltage VBE (≈ 0.65 V) of the transistor . (See

How to Set Time Constant f or Timer & Latch-

Type Short-Circuit Protection Circuit.

)

When the protection circuit operates, recycle the power to reset the circuit.

(2) Low input voltage malfunction fail-safe circuit

A transient at power-on, or an instantaneous supply v oltage drop can cause a control IC malfunction, which may

damage the system. The low input voltage malfunction fail-safe circuit detects the inter nal reference voltage

level based on the supply voltage level, resets the latch circuit, tur ns off the output transistor, clears the duty

cycle to 0 and holds the SCP pin (pin 15) at Low level. All circuits are recovered when the supply voltage is

greater than the threshold voltage of the fail-safe circuit.

MB3788

■ABSOLUTE MAXIMUM RATINGS

*: Value obtained when mounted on 4 cm × 4 cm double-sided epoxy substrate

WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,

temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.

■RECOMMENDED OPERATING CONDITIONS

WARNING: The recommended operating conditions are required in order to ensure the normal operation of the

semiconductor device. All of the device’s electrical characteristics are warranted when the device is

operated within these ranges.

Always use semiconductor devices within their recommended operating condition ranges. Operation

outside these ranges may adversely affect reliability and could result in device failure.

No warranty is made with respect to uses, operating conditions, or combinations not represented on

the data sheet. Users considering application outside the listed conditions are advised to contact their

FUJITSU representatives beforehand.

(TA = +25°C)

Parameter Symbol Conditions Ratings Unit

Min Max

Supply voltage VCC ——

20 V

Control input voltage VICTL ——

20 V

Allowable loss PDTa ≤ +25°C—500* mW

Operating ambient temperature TOP —-30 +85 °C

Storage temperature Tstg —-55 +125 °C

(TA = +25°C)

Parameter Symbol Conditions Values Unit

Min Typ Max

Supply voltage VCC —3.66.018V

Reference voltage output current IOR —-1—0mA

Error amplifier input voltage VI—-0.2—V

CC - 1.8 V

Error amplifier input voltage VI—-0.2—V

CC V

Control input voltage VICTL —-0.2—18V

Output current IO—3.0—30mA

Operating frequency fosc — 100 300 1000 kHz

Operating ambient temperature Top — -30 25 85 °C

MB3788

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■ELECTICAL CHARACTERISTICS

(Continued)

(VCC =6V, TA = +25°C)

Parameter Symbol Conditions Value Unit

Min Typ Max

Reference

voltage

Reference voltage VREF IOR = -1 mA 2.475 2.500 2.525 V

Output voltage temperature

variation ∆VREF/

VREF TA = -30° to +85°C-2±0.2 2 %

Input stability Line VCC = 3.6 V to 18 V — 2 10 mV

Load stability Load IOR = -0.1 mA to 1 mA — 3 10 mV

Short-circuit output current IOS VREF = 2 V -20 -8 -3 mA

Low voltage

malfunction

fail-safe

circuit

Threshold voltage VtH ——2.65—V

VtL ——2.45—V

Hysteresis width VHYS —80200—mV

Reset voltage VR—1.51.9—V

Short-circuit

detection

comparator

Input offset voltage VIO — 0.58 0.65 0.72 V

Input bias current IIB VI = 0 V -200 -100 — nA

In-phase input voltage range VICM —-0.2—V

CC-1.8 V

Short-circuit

detector

Threshold voltage VtPC — 0.60 0.65 0.70 V

Input standby voltage VSTB — — 50 100 mV

Input latch voltage VI— — 50 100 mV

Input source current IIbpc — -1.4 -1.0 -0.6 µA

Error

amplifier

Input offset voltage VIO VFB = 1.6 V -10 — 10 mV

Input offset current IIO VFB = 1.6 V -100 — 100 nA

Input bias current IIB VFB = 1.6 V -200 -60 — nA

In-phase input voltage range VICM —-0.2—V

CC-1.8 V

Voltage gain AV—60100—dB

Frequency bandwidth BW AV = 0 dB — 800 — kHz

In-phase signal rejection ratio CMRR — 60 80 — dB

Maximum output voltage width VOM+ —V

REF-0.3 2.4 — V

VOM- — — 0.05 0.5 V

Output sink current IOM+ VFB = 1.6 V — 120 — µA

Output source current IOM- VFB = 1.6 V — -2 — mA

MB3788

(Continued)

Parameter Symbol Conditions Values Unit

Min Typ Max

PWM

comparator

Threshold voltage Vt0 Duty cycle = 0 % 1.05 1.3 — V

Vt100 Duty cycle = 100 % — 1.9 2.25 V

Input sink current IIM+ ——120—µA

Input source current IIM- ——-2—mA

Input bias current IIB VI = 0 V -1.0 -0.5 — µA

Control

Threshold voltage Vth — 0.7 1.4 2.1 V

Input current IIH VCTL = 5 V — 100 200 µA

IIL VCTL = 0 V -10 — 10 µA

Output

Source current IO——-40—mA

Sink current IORB = 50 Ω18 30 42 mA

Output leak current ILO VO = 18 V — — 20 µA

All devices Standby current ICCO ——010µA

Power current at output OFF ICC ——1.92.7mA

MB3788

■STANDARD CHARACTERISTIC CURVES

(Continued)

2.5

2.0

1.5

1.0

0.5

0048121620

Power

current

lCC (mA)

Supply voltage VCC (V)

00 4 8 12 16 20

Reference

voltage

VREF (V)

Supply voltage VCC (V)

CTL1, 2 = 6 V

012345

Reference

voltage

VREF (V)

Supply voltage VCC (V)

VREF

2.56

2.54

2.52

2.50

2.48

2.46

2.44

-60 -40 -20 0 20 40 60 80 100

Reference

voltage

VREF (V)

Ambient temperature TA (°C)

Output

current

setting

pin voltage

VE (V)

VCC = 6 V

VCTL1, 2 = 6 V

IOR = -1 mA

1. Power current - supply voltage characteristic 2. Reference voltage - supply voltage characteristic

3.Ref erence voltage, output current setting pin v oltage

- supply voltage characteristic 4. Reference voltage - ambient temperature characteristic

3.0

2.8

2.6

2.4

2.2

2.0

012345

Reference

voltage

VREF (V)

Control voltage VCTL1 (V)

500

400

300

200

100

0048121620

Control

current

lCTL1 (µA)

Control voltage VCTL1 (V)

5. Reference voltage - control voltage characteristic 6. Control current - control voltage characteristic

TA = +25°C

VCC = 6 V

TA = +25°CVCC = 6 V

TA = +25°C

CTL1 = 6 V

TA = +25°C

MB3788

(Continued)

VCC = 6 V

VFB = 1.6 V

TA = +25°C

100

00 5K 10K 50K 100K 500K 1M

1.9V

1.3V

Duty

Dtr (%)

Input oscillating frequency (Hz)

-20

-40

1K 10K 100K 1M 5M 10M

TA = +25°C180

-90

-180

Input waveform

Gain

(dB) Phase

φ (deg)

1000

800

600

400

200

0-20 020 406080 100

Power

dissipation

PD (mW)

Ambient temperature TA (°C)

7. Duty - input oscillating frequency characteristic 8.Gain - frequency characteristic and phase - frequency

characteristic

f (Hz)

9. Power dissipation - ambient temperature characteristic Circuit for measuring gain - frequency characteristic and

phase - frequency characteristic

2.5 V

+out

2.5 V

in +

10 µF

240 kΩ

4.7 kΩ

VCC = 6 V

4.7 kΩ4.7 kΩ

Error amplifier

MB3788

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■HOW TO SET OUTPUT VOLTAGE

VREF VOUT

RNF

VOUT = (R1 + R2)

VREF

2 × R2

Note: Set the output voltage in the positive range (VOUT > 0).

MB3788

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■HOW TO SET OUTPUT CURRENT

The output circuit is configured in a push-pull type as shown in Figure 1. The ON current value of the output

current wa vef orm shown in Figure 2 is a constant current and the OFF v alue set by RE is set b y a time constant.

Each output current can be calculated from the following expression:

• ON current = 1.5/RE (A) (Output current setting pin voltage: VE ≈ 1.5 V)

• The OFF current time constant is proportional to the value of CB.

OFF current

setting part

Drive Tr

OFF

current

ON current

Output

current 0

ON current

OFF current

22 µH(5 V)

3150 Ω

1000 pF

4 5 1

VCC

Iout

1000 pF

10 µF

-IN1 (E)

8.2 kΩ

-IN1 (C)

MB3788 2

Fig.1 Output Circuit Diagram Fig.2 Output Current Waveform

Fig.3 Output Pin Voltage and Current Waveforms (Channel 1) Fig.4 Measurement Circuit Diagram

2.7 kΩ

Vout

MB3788

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■HOW TO SET TIME CONSTANT FOR TIMER & LATCH-TYPE SHORT-CIRCUIT

PROTECTION CIRCUIT

If the load conditions of the switching regulator are stable, the outputs of comparators 1 and 2 do not change,

so the SP comparator outputs a High level. At this time, the SCP pin (pin 15) is held at about 50 mV.

If the load conditions change suddenly due to a load shor t-circuit, for example, the output voltage of the com-

parator of the channel becomes a High-level signal (more than 2.1 V). Then, the SVP comparator outputs a

Low lev el and transistor Q1 is turned off. The short-circuit protection capacitor CPE externally connected to the

SCP pin starts to charge.

VPE = 50 mV + tPE × 10-6/CPE

0.65 = 50 mV + tPE × 10-6/CPE

CPE = tPE /0.6 (s)

Once the capacitor CPE is charged to about 0.65 V, the SR latch is set and the output dr ive transistor is turned

off. At this time, the duty cycle is made low and the output voltage of the SCP pin (pin 15) is held at Low level.

This closes the SR latch input to discharge CPE.

Fig. 5 Latch-Type Short-Circuit Protection Circuit

2.1 V

Low

input

voltage

protection

circuit

SR latch-type

circuit

1 µA

CPE

OUT

2.5 V

Comparator 1

Comparator 2

PWM

comparator

MB3788

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■PROCESSING WITHOUT USING SCP PIN

If the timer and latch-type shor t-circuit protection circuit is not used, connect the SCP pin (pin 15) to GND as

close as possible. Also, connect the input pin of each channel comparator to the VCC pin (pin 11).

Fig. 6 Processing without using SCP Pin

9-IN1 (C)

VCC

16 -IN2 (C)

15 GND

SCP

MB3788

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■EQUIVALENT SERIES RESISTANCE OF SMOOTHING CAPACITOR AND STABILITY OF

DC/DC CONVERTER

The equivalent ser ies resistance (ESR) of the smoothing capacity in a DC/DC converter has a great effect on

the loop phase characteristics.

The ESR causes a small delay at the capacitor with a ser ies resistance of 0 (Figures 8 and 9), thus improving

system stability. On the other hand, using a smoothing capacitor with a low ESR reduces system stability.

Therefore, attention should be paid to using semiconductor electrolytic capacitors (such as OS capacitors) or

tantalum capacitors with a low ESP. (Phase margin reduction b y using an OS capacitor is e xplained on the ne xt

page.)

RLVIN D

-20

-40

-60

10 100 1k 10k 100k

-90

-180

10 100 1k 10k 100k

(2)

(1)

(1): RC = 0 Ω

(2): RC = 31 mΩ

(2)

(1)

Gain

(dB)

Frequency f (Hz) Frequency f (Hz)

Phase

(deg)

(1): RC = 0 Ω

(2): RC = 31 mΩ

Fig. 7 Basic Voltage-Drop Type DC/DC Converter Circuit

Fig.8 Gain - Frequency Characteristic Fig.9 Phase - Frequency Charecteristic

MB3788

(Reference Data)

The phase margin is halve d by changing the smoothing capacitor from an aluminum electrolytic capacitor (Rc

= 1.0 Ω) to a semiconductor electrolytic capacitor (OS capacitor: Rc = 0.2 Ω) with a low ESR (Figures 11 and 12).

Fig. 10 DC/DC Converter AV - φ

φφ

φ Characteristic Measurement Diagram

Fig. 11 Gain - Frequency Characteristic

Fig.12 Phase - Frequency Characteristic Curves

AV - φ characteristic between VOUT and VIN

Error amplifier

VOUT

CNF

FB VIN

VO+

-IN

+IN

VREF/2

62°

AVϕ⇒

101001 k10 k100 k

-20

-40

180

-90

-180

VCC = 10 V

RL = 25 Ω

CP = 0.1 µF

Gain

(dB)

Frequency f (Hz)

Aluminum electrolytic capacitor gain - frequency and phase - frequency characteristics (DC/DC converter +5 V output)

Aluminum electrolytic capacitor

220 µF (16 V)

Rc ≈ 1.0 Ω: fOSC = 1 kHz

VO+

Phase

(deg)

GND

ϕ⇒

101001 k10 k100 k

-20

-40

180

-90

-180

27°

VCC = 10 V

RL = 25 Ω

CP = 0.1 µF

Gain

(dB)

Frequency f (Hz)

OS capacitor gain - frequency and phase - frequency characteristics (DC/DC converter +5 V output)

OS capacitor

22 µF (16 V)

Rc ≈ 1.2 Ω: fOSC = 1 kHz

VO+

GND

Phase

(deg)

MB3788

■

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■APPLICATION CIRCUIT

+15 V

+24 V

DC motor 1

DC motor 2

150 Ω

1000 pF

Channel 1

(dB)

(b)

22 µH3 V

10 µF

Ca2

Cb2

OUT2

VE2

150 Ω

1000 pF <Logic power supply>

(a)

22 µH5 V

10 µF

Ca1

VCC(out)

OUT1

VE1

Cb1

(15 mA)

Channel 2

(deg)

10 µH

-33 µF

VCC

-IN1 (E)

FB1

-IN1 (C)

+IN1 (E)

VCC

CTL2

CTL1

(a) 4.7 kΩ

4.7 kΩ

8.2 kΩ

2.7 kΩ100 kΩ

-IN2 (E)

FB2

-IN2 (C)

+IN2 (E)

(b) 4.7 kΩ

4.7 kΩ

3.8 kΩ

2.7 kΩ100 kΩ

15 10

12 GND-IN(PWM)SCPVREF

⇑

Triangular wave signal

1.9 V

1.3 V

<MB3785A-used DC/DC converter>

0.1 µF

0.22 µF

MB3788

■

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■NOTES ON USE

• Take account of common impedance when designing the earth line on a printed wiring board.

• Take measures against static electricity.

- For semiconductors, use antistatic or conductive containers.

- When storing or carrying a printed circuit board after chip mounting, put it in a conductive bag or container.

- The work table, tools and measuring instruments must be grounded.

- The worker must put on a grounding device containing 250 kΩ to 1 MΩ resistors in series.

• Do not apply a negative voltage

- Applying a negative voltage of −0.3 V or less to an LSI may generate a parasitic transistor, resulting in

malfunction.

■

■■

■ORDERING INFORMATION

Part number Package Remarks

MB3788PFV 24-pin Plastic SSOP

(FPT-24P-M03)

MB3788

■

■■

■PACKAGE DIMENSION

24-pin plastic SSOP

(FPT-24P-M03)

Note 1) *1 : Resin protrusion. (Each side : +0.15 (.006) Max) .

Note 2) *2 : These dimensions do not include resin protrusion.

Note 3) Pins width and pins thickness include plating thickness.

Note 4) Pins width do not include tie bar cutting remainder.

Dimensions in mm (inches) .

Note : The values in parentheses are reference values.

2003 FUJITSU LIMITED F24018S-c-4-5

7.75±0.10(.305±.004)

5.60±0.10 7.60±0.20

(.220±.004) (.299±.008)

0.10(.004)

112

1324

0.65(.026) –0.07

+0.08

0.24

.009 +.003

–.003 M

0.13(.005)

INDEX

0.17±0.03

(.007±.001)

"A"

0.25(.010)

0.10±0.10

(.004±.004)

(Stand off)

Details of "A" part

(Mounting height)

1.25 +0.20

–0.10

–.004

+.008

.049

0~8˚

0.50±0.20

(.020±.008)

0.60±0.15

(.024±.006)

0.10(.004)

MB3788

FUJITSU LIMITED

The contents of this document are subject to change without notice.

Customers are advised to consult with FUJITSU sales

representatives before ordering.

The information, such as descriptions of function and application

circuit examples, in this document are presented solely for the

purpose of reference to show examples of operations and uses of

Fujitsu semiconductor device; Fujitsu does not warrant proper

operation of the device with respect to use based on such

information. When you develop equipment incorporating the

device based on such information, you must assume any

responsibility arising out of such use of the information. Fujitsu

assumes no liability for any damages whatsoever arising out of

the use of the information.

Any information in this document, including descriptions of

function and schematic diagrams, shall not be construed as license

of the use or exercise of any intellectual property right, such as

patent right or copyright, or any other right of Fujitsu or any third

party or does Fujitsu warrant non-infringement of any third-party’s

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Fujitsu assumes no liability for any infringement of the intellectual

property rights or other rights of third parties which would result

from the use of information contained herein.

The products described in this document are designed, developed

and manufactured as contemplated for general use, including

without limitation, ordinary industrial use, general office use,

personal use, and household use, but are not designed, developed

and manufactured as contemplated (1) for use accompanying fatal

risks or dangers that, unless extremely high safety is secured, could

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reaction control in nuclear facility, aircraft flight control, air traffic

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launch control in weapon system), or (2) for use requiring

extremely high reliability (i.e., submersible repeater and artificial

satellite).

Please note that Fujitsu will not be liable against you and/or any

third party for any claims or damages arising in connection with

above-mentioned uses of the products.

Any semiconductor devices have an inherent chance of failure. You

must protect against injury, damage or loss from such failures by

incorporating safety design measures into your facility and

equipment such as redundancy, fire protection, and prevention of

over-current levels and other abnormal operating conditions.

If any products described in this document represent goods or

technologies subject to certain restrictions on export under the

Foreign Exchange and Foreign Trade Law of Japan, the prior

authorization by Japanese government will be required for export

of those products from Japan.

F0309

 FUJITSU LIMITED Printed in Japan