FUJITSU MB3788

FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27209-1E
ASSP
SWITCHING REGULATOR
CONTROLLER
MB3788
■
DESCRIPTION
24-PIN PLASTIC SSOP
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
voltage power supply with a voltage accuracy of ±1%. The maximum operating
frequency is 1 MHz. It is designed for a voltage-drop output switching regulator
suitable for a logic power supply or speed control of a DC motor.
The MB3788 is compatible with all master ICs producing triangular waves, sawtooth waves and sine waves with an amplitude of 1.3 to 1.9 V.
It can be used in high-performance portable equipment such as a video camcorder or notebook personal computer (word processor).
■
FEATURES
- Wide operating power supply voltage range: 3.6 to 18 V
- Low power dissipation
- Operating: 1.9 mA (standard)
Standby: 10 µA max.
- 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
(FPT-24P-M03)
PNP transistor drive output pin: Push-pull type
ON/OFF current values set independently
- On-chip standby function and output control function
This device contains circuitry to protect the inputs against
damage due to high static voltages or electric fields. However,
it is advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to
this high impedance circuit.
- High-density packaging: SSOP-24P
1
MB3788
■
PIN ASSIGNMENT
(TOP VIEW)
VCC(out)
1
24
GND
OUT1
2
23
OUT2
VE1
3
22
VE2
Cb1
4
21
Cb2
Ca1
5
20
Ca2
FB1
6
19
FB2
-IN1(E)
7
18
-IN2(E)
+IN1(E)
8
17
+IN2(E)
-IN1(C)
9
16
-IN2(C)
-IN(PWN)
10
15
SCP
VCC
11
14
CTL2
VREF
12
13
CTL1
(FPT-24P-M03)
2
MB3788
■
PIN DESCRIPTION
Pin No.
Channel
1
Channel
2
Control
circuit
Power
circuit
Note:
Pin name
I/O
Descriptions
2
OUT1
O
Channel 1 push-pull type output
3
VE1
I
Channel 1 output current setting
4
Ca1
—
5
Cb1
—
Channel 1 output transistor OFF current setting: Output transistor OFF
The current is set by connecting a capacitor between pins Ca1 and Cb1.
6
FB1
O
Channel 1 error amplifier output
7
-IN1(E)
I
Channel 1 error amplifier inversion input
8
+IN1(E)
9
-IN1(C)
I
Channel 1 comparator inversion input
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
—
21
Cb2
—
Channel 2 output transistor OFF current setting: Output transistor OFF
The current is set by connecting a capacitor between pins Ca2 and Cb2.
22
VE2
I
Channel 2 output current setting
23
OUT2
O
Channel 2 push-pull type output
13
CTL1
I
Power and channel 1 control pin
H level: Power and channel 1 operating
L level: Standby
Channel 2 control pin
When CTL1 pin = H level,
H level: Channel 2 operating
L level: Channel 2 OFF
Channel 1 error amplifier non-inversion input
14
CTL2
I
15
SCP
—
Short-circuit protection circuit capacitor connection
1
VCC2
—
Output circuit power pin
10
-IN(PWM)
I
11
VCC1
—
Reference power and control circuit power
12
VREF
O
Reference voltage output
24
GND
—
Ground
Master oscillating waveform input
The alphabetic characters in parenthesis above indicate the following input pins.
(C): Comparator
(E): Error amplifier
3
MB3788
■
BLOCK DIAGRAM
Cb1
Channel 1
4
5
Ca1
+IN1 (E)
+
8
-IN1 (E)
7
FB1
6
OFF current setting
+
-
Comparator 1
VCC(out)
2
OUT1
3
0.6 V -
9
1
PWM comparator 1
-
+
-IN1 (C)
Error amplifier 1
VE1
1.5 V
Ca2
Channel 2
20
21
Cb2
+IN2 (E)
17
-IN2 (E)
18
FB2
19
+
OFF current setting
+
-
PWM comparator 2
-
+
0.6 V
-IN2 (C)
Error amplifier 2
16
Timer circuit
23
Comparator 2
OUT2
22
VE2
1.5 V
-
SCP comparator +
14
CTL2
11
VCC
13
CTL1
1.9 V
1.3 V
2.1 V
1 µA
SCP
VREF
15
SR latch
circuit
4
Low input
voltage
protection
circuit
Reference Power/channel
ON/OFF
voltage
circuit
power (2.5 V)
10
12
-IN(PWM)
VREF
24
GND
MB3788
■
FUNCTIONAL DESCRIPTION
1. Major Functions
(1) Reference voltage power circuit
The reference voltage power supply produces a reference 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 inversion 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 voltage input to the -IN pin (PWM) turns the output transistor on when it is lower 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 transistor 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
Voltage level at CTL pin
CTL1
CTL2
L
×
H
H
Channel ON/OFF status
Power circuit
Channel 1
Channel
Stand by state*
ON
ON
L
OFF
*The power current in the standby state is 10 µA max.
5
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 turned 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 voltage level of the
comparator does not return to the normal voltage level until the capacitor voltage rises to the base-emitter junction voltage VBE
(≈ 0.65 V) of the transistor. (See How to Set Time Constant for 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 voltage drop can cause a control IC malfunction, which may damage the
system. The low input voltage malfunction fail-safe circuit detects the internal reference voltage level based on the supply voltage
level, resets the latch circuit, turns 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.
6
MB3788
■
ABSOLUTE MAXIMUM RATINGS
(TA = +25°C)
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage
VCC
—
20
V
Control input voltage
VICTL
—
20
V
Allowable loss
PD
Ta ≤ +25°C
500*
mW
Operating ambient temperature
TOP
—
-30 to +85
°C
Storage temprature
Tstg
—
-55 to +125
°C
* Value obtained when mounted on 4 cm × 4 cm double-sided epoxy substrate
■
RECOMMENDED OPERATING CONDITIONS
(TA = +25°C)
Parameter
Symbol
Conditions
Supply voltage
VCC
Reference voltage output curren
Values
Unit
Min.
Typical
Max.
—
3.6
6.0
18
V
IOR
—
-1
—
0
mA
Error amplifier input voltage
VI
—
-0.2
—
VCC - 1.8
V
Error amplifier input voltage
VI
—
-0.2
—
VCC
V
VICTL
—
-0.2
—
18
V
IO
—
3.0
—
30
mA
Operating frequency
fosc
—
100
300
1000
kHz
Operating ambient temperature
Top
—
-30
25
85
°C
Control input voltage
Output current
7
MB3788
■
ELECTICAL CHARACTERISTICS
(VCC =6V, TA = +25°C)
Value
Parameter
Reference
voltage
Low voltage
malfunction
fail-safe
circuit
Short-circuit
detection
comparator
Short-circuit
detector
Error
amplifier
Symbol
Conditions
Unit
Min.
Typical
Max.
2.475
2.500
2.525
V
Reference voltage
VREF
IOR = -1 mA
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
VtH
—
—
2.65
—
V
VtL
—
—
2.45
—
V
Hysteresis width
VHYS
—
80
200
—
mV
Reset voltage
VR
—
1.5
1.9
—
V
Input offset voltage
VIO
—
0.58
0.65
0.72
V
Input bias current
IIB
-200
-100
—
nA
In-phase input voltage range
VICM
—
-0.2
—
VCC-1.8
V
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
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
—
VCC-1.8
V
Voltage gain
AV
—
60
100
—
dB
Frequency bandwidth
BW
—
800
—
kHz
In-phase signal rejection ratio
CMRR
—
60
80
—
dB
VOM+
—
VREF-0.3
2.4
—
V
VOM-
—
—
0.05
0.5
V
Threshold voltage
VI = 0 V
AV = 0 dB
Maximum output voltage width
8
Output sink current
IOM+
VFB = 1.6 V
—
120
—
µA
Output source current
IOM-
VFB = 1.6 V
—
-2
—
mA
MB3788
Values
Parameter
Symbol
Conditions
Unit
Min.
Typical
Max.
1.05
1.3
—
V
Vt0
Duty cycle = 0 %
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
-1.0
-0.5
—
µA
Threshold voltage
Vth
—
0.7
1.4
2.1
V
IIH
VCTL = 5 V
—
100
200
µA
IIL
VCTL = 0 V
-10
—
10
µA
Source current
IO
—
—
-40
—
mA
Sink curren
IO
RB = 50 Ω
18
30
42
mA
Output leak current
ILO
VO = 18 V
—
—
20
µA
Standby current
ICCO
—
—
0
10
µA
Power current at output OFF
ICC
—
—
1.9
2.7
mA
Threshold voltage
PWM
comparator
Control
Output
All devices
VI = 0 V
Input current
9
MB3788
■
STANDARD CHARACTERISTIC CURVES
1. Power current - supply voltage characteristic
2. Reference voltage - supply voltage characteristic
TA = +25°C
CTL1 = 6 V
2.5
TA = +25°C
5
2.0
4
CTL1, 2 = 6 V
Power 1.5
current
lCC (mA)
1.0
Reference 3
voltage
VREF (V)
2
0.5
1
0
0
4
8
12
16
0
0
20
4
8
3.Reference voltage, output current setting pin voltage
- supply voltage characteristic
TA = +25°C
5
4
Reference
voltage
3
VREF (V)
VE
2
3
4
VCC = 6 V
VCTL1, 2 = 6 V
IOR = -1 mA
Reference 2.54
voltage
VREF (V) 2.52
2.50
Output
2 current
setting
pin voltage
1 VE (V)
2.48
2.46
2.44
-60 -40 -20 0
20 40 60 80 100
Ambient temperature TA (°C)
0
1
20
2.56
5
3
2
0
0
16
4. Reference voltage - ambient temperature characteristic
4
VREF
1
12
Supply voltage VCC (V)
Supply voltage VCC (V)
5
Supply voltage VCC (V)
5. Reference voltage - control voltage characteristic
VCC = 6 V
TA = +25°C
3.0
2.8
400
Control
current 300
lCTL1 (µA)
2.4
200
2.2
100
1
2
3
4
5
Control voltage VCTL1 (V)
VCC = 6 V
TA = +25°C
500
Reference
voltage 2.6
VREF (V)
2.0
0
10
6. Control current - control voltage characteristic
0
0
4
8
12
16
20
Control voltage VCTL1 (V)
MB3788
8.Gain - frequency characteristic and phase - frequency
characteristic
7. Duty - input oscillating frequency characteristic
100
Input waveform
1.9V
1.3V
80
Duty
Dtr (%)
VCC = 6 V
VFB = 1.6 V
TA = +25°C
TA = +25°C
40
90
20
Gain
(dB)
0
60
40
180
Phase
0 φ (deg)
20
-90
-20
0
05 K10 K50 K100 K500 K1 M
Input oscillating frequency (Hz)
-180
-40
1 K 10 K100 K1 M5 M10 M
f (Hz)
9. Power dissipation - ambient temperature characteristic
Circuit for measuring gain - frequency characteristic and
phase - frequency characteristic
1000
2.5 V
VCC = 6 V
2.5 V
240 kΩ
800
4.7 kΩ
Power
600
dissipation
PD (mW)
400
in
4.7 kΩ
10 µF
- +
out
+
Error amplifier
200
4.7 kΩ 4.7 kΩ
0
-20 020 4060 80 100
Ambient temperature TA (°C)
11
MB3788
■
HOW TO SET OUTPUT VOLTAGE
VREF
VOUT
VOUT =
R
R1
+
-
R
R2
RNF
Note: Set the output voltage in the positive range (VOUT > 0).
12
VREF
2 × R2
(R1 + R2)
MB3788
■
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 waveform shown in Figure
2 is a constant current and the OFF value set by RE is set by 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.
Drive Tr
ON current
CB
OFF
current
OFF current
setting part
Output 0
current
ON current
RE
OFF current
VE
t
Fig.1 Output Circuit Diagram
Fig.2 Output Current Waveform
1000 pF
4
-IN1 (C)
VCC
(5 V)
22 µH
5
1
Iout
MB3788
8.2 k
10 µF
2.7 k
2
1000 pF
3
Fig.3 Output Pin Voltage and Current Waveforms (Channel 1)
Vout
-IN1 (E)
150 Ω
Fig.4 Measurement Circuit Diagram
13
MB3788
■
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 short-circuit, for example, the output voltage of the comparator of the channel becomes a
High-level signal (more than 2.1 V). Then, the SVP comparator outputs a Low level 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 drive 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.
2.5 V
1 µA
15
Comparator 1
Comparator 2
+
Q2
Q1
S
CPE
R
SR latch-type
circuit
Low
PWM
input
voltage comparator
protection
circuit
2.1 V
Fig. 5 Latch-Type Short-Circuit Protection Circuit
14
OUT
MB3788
■
PROCESSING WITHOUT USING SCP PIN
If the timer and latch-type short-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).
11
VCC
9
-IN1 (C)
16
-IN2 (C)
SCP
15
GND
24
Fig. 6 Processing without using SCP Pin
15
MB3788
■
EQUIVALENT SERIES RESISTANCE OF SMOOTHING CAPACITOR AND STABILITY OF
DC/DC CONVERTER
The equivalent series 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 series 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 by using an OS capacitor is explained on
the next page.)
L
Tr
RC
VIN
D
RL
C
Fig. 7 Basic Voltage-Drop Type DC/DC Converter Circuit
20
0
0
(2)
Gain -20
(dB)
-40
(2)
(1): RC = 0 Ω
(2): RC = 31 mΩ
(1)
-60
101001 k 10 k100 k
Frequency f (Hz)
Fig.8 Gain - Frequency Characteristic
16
Phase -90
(deg)
(1): RC = 0 Ω
(2): RC = 31 mΩ
(1)
-180
101001 k 10 k100 k
Frequency f (Hz)
Fig.9 Phase - Frequency Charecteristic
MB3788
(Reference Data)
The phase margin is halved 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).
VOUT
VO+
CNF
+
-
FB
R2
-IN
AV - φ characteristic between VOUT and VIN
VIN
+IN
R1
VREF/2
Error amplifier
Fig. 10 DC/DC Converter AV - φ Characteristic Measurement Diagram
Aluminum electrolytic capacitor gain - frequency and phase - frequency characteristics (DC/DC converter +5 V output)
60
VCC = 10 V
RL = 25 Ω
180
CP = 0.1 µF
40
AV
ϕ⇒
90
VO+
20
Gain
+
62°
(dB)
Phase
0 (deg)
0
-20
-90
-40
101001 k 10 k 100 k
-180
GND
Aluminum electrolytic capacitor
220 µF (16 V)
Rc ≈ 1.0 Ω: fOSC = 1 kHz
Frequency f (Hz)
Fig. 11 Gain - Frequency Characteristic
OS capacitor gain - frequency and phase - frequency characteristics (DC/DC converter +5 V output)
60
VCC = 10 V
RL = 25 Ω
CP = 0.1 µF
AV
40
20
Gain
(dB)
0
180
ϕ⇒
90
27°
0
VO+
Phase
(deg)
-20
-90
-40
101001 k 10 k 100 k
-180
+
GND
OS capacitor
22 µF (16 V)
Rc ≈ 1.2 Ω: fOSC = 1 kHz
Frequency f (Hz)
Fig.12 Phase - Frequency Characteristic Curves
17
MB3788
■
APPLICATION CIRCUIT
10 µH
VCC
13
+
-
+
-
33 µF
11
14
VCC
CTL1 CTL2
4.7 kΩ
8
Cb1
+IN1 (E)
Ca1
5
VCC(out)
1
OUT1
2
8.2 kΩ
7
2.7 kΩ 0.22 µF
<Logic power supply>
4
1000 pF
4.7 kΩ
(a)
Channel 1
(dB)
-IN1 (E)
100 kΩ
9
-IN1 (C)
17
+IN2 (E)
VE1
5V
+
-
150 Ω
3
(15 mA)
(b)
4.7 kΩ
Ca2
20
Cb2
21
OUT2
23
1000 pF
3.8 kΩ
18
-IN2 (E)
Channel 2
(deg)
100 kΩ
19
FB2
16
-IN2 (C)
VREF
12
22 µH
3V
+
-
150Ω
VE2
SCP
-IN(PWM)
GND
10
24
15
0.1 µF
22
⇑
Triangular wave signal
1.9 V
1.3 V
CT
<Analog power supply>
<Sensor power supply>
+15 V
+24 V
<MB3785A-used DC/DC converter>
<DC motor speed control>
DC motor 1
<DC motor speed control>
DC motor 2
18
10 µF
<Logic power supply>
4.7 kΩ
2.7 kΩ 0.22 µF
(a)
22 µH
FB1
6
(b)
33 µF
10 µF
MB3788
■
PRECAUTIONS
1. Do not apply any voltage greater than the maximum rating, or the LSI may be damaged.
2. Use the MB3788 under the recommended operating conditions.
If a voltage greater than the maximum voltage is applied, the electrical characteristics are not guaranteed; if a voltage smaller than the
minimum voltage is applied, the LSI operation will become unstable.
3. To ground the PC board, use the thickest cable possible because high frequencies are used which can easily produce high-frequency noise.
4. Connecting unused channel pin
For unused channels, the output voltage of the comparator for detecting a short-circuit must be fixed at the Low level.
5. Take measures against static electricity.
•
•
•
•
Carry semiconductors in a conductive container or anti-static case.
Carry the PC board in a conductive bag or container if it is stored or transported after packaging.
Ground the workbench, and all tools and measuring instruments.
Workers should be grounded through a resistance of 250 kΩ to 1 MΩ.
19
MB3788
■
PACKAGE DIMENSION
24-pin plastic SSOP
(FPT-24P-M03)
+0.20
* 7.75±0.10(.305±.004)
1.25 –0.10
+.008
.049 –.004
(Mounting height)
0.10(.004)
* 5.60±0.10
INDEX
0.65±0.12(.0256±.0047)
(.220±.004)
+0.10
C
20
1994 FUJITSU LIMITED F24018S-2C-2
6.60(.260)
NOM
"A"
+0.05
0.22 –0.05
0.15 –0.02
+.004
–.002
.006 –.001
.009
7.15(.281)REF
7.60±0.20
(.299±.008)
Details of "A" part
+.002
0.10±0.10(.004±.004)
(STAND OFF)
0
10°
0.50±0.20
(.020±.008)
Dimensions in mm (inches).
MB3788
FUJITSU LIMITED
For further information please contact:
Japan
FUJITSU MEDIA DEVICES LIMITED
Marketing and Technical Support Dept.
SUN HAMADA BLDG 2F
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kouhoku-ku Yokohama-shi
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FUJITSU MICROELECTRONICS, INC.
Semiconductor Division
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Fax: (408) 922-9179
Customer Response Center
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Europe
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D-63303 Dreieich-Buchschlag
Germany
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Fax: (06103) 690-122
http://www.fujitsu-ede.com/
Asia Pacific
FUJITSU MICROELECTRONICS ASIA PTE LTD
#05-08, 151 Lorong Chuan
New Tech Park
Singapore 556741
Tel: (65) 281-0770
Fax: (65) 281-0220
http://www.fmap.com.sg/
F9902
 FUJITSU LIMITED Printed in Japan
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The contents of this document are subject to change without
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representatives before ordering.
The information and circuit diagrams in this document are
presented as examples of semiconductor device applications,
and are not intended to be incorporated in devices for actual use.
Also, FUJITSU is unable to assume responsibility for
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arising from the use of this information or circuit diagrams.
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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.
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