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REGULATOR CONTROLLER. MB3775 Datasheet

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REGULATOR CONTROLLER. MB3775 Datasheet
















MB3775 CONTROLLER. Datasheet pdf. Equivalent













Part

MB3775

Description

SWITCHING REGULATOR CONTROLLER



Feature


FUJITSU SEMICONDUCTOR DATA SHEET DS04-2 7204-3E ASSP SWITCHING REGULATOR CONT ROLLER MB3775 LOW VOLTAGE DUAL PWM SWIT CHING REGULATOR CONTROLLER The MB3775 i s a dual pulse-width-modulation control circuit. It contains the basic circuit s required for two PWM control circuits . Complete synchronization is obtained by using the same oscillator output wav eform. This IC can.
Manufacture

Fujitsu

Datasheet
Download MB3775 Datasheet


Fujitsu MB3775

MB3775; provide following types of output volta ge: step down, step up, and inverter. P ower consumption is low, thus the MB377 5 is ideal for use in highefficiency po rtable equipment. (DIP-16P-M04) • • • • • • Wide supply vol tage range: 3.6 V to 18 V Low current c onsumption: 1.3 mA typical Wide oscilla tion frequency range: 1 kHz to 500 kHz On-chip timer latch short protec.


Fujitsu MB3775

tion circuit On-chip under voltage locko ut protection On-chip reference voltage : 1.28 V Variable dead time provides co ntrol over total operating range. (Ta = 25°C) Value 20 -0.3 to +10 20 75 Ta 25 °C(SOP) Power Dissipation PD TOP Tstg Ta ≤ 25 °C(DIP) Ta ≤ 25°C(V SOP) *620 1000 *430 -30 to +85 Unit V V V mA mW mW mW °C °C (FPT-16P-M06) ABSOLUTE MAXIMUM RATINGS (see .


Fujitsu MB3775

NOTE) Rating Power Supply Voltage Error Amp. Input Voltage Collector Output Vol tage Collector Output Current Symbol VC C VI VO IO Condition (FPT-16P-M05) PIN ASSIGNMENT (TOP VIEW) CT RT +IN1 -IN1 FB1 D.T.C.1 OUT1 E/GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Operating Tempe rature Storage temperature -55 to+125 *: The packages are mounted on the epo xy board (4 cm x 4.





Part

MB3775

Description

SWITCHING REGULATOR CONTROLLER



Feature


FUJITSU SEMICONDUCTOR DATA SHEET DS04-2 7204-3E ASSP SWITCHING REGULATOR CONT ROLLER MB3775 LOW VOLTAGE DUAL PWM SWIT CHING REGULATOR CONTROLLER The MB3775 i s a dual pulse-width-modulation control circuit. It contains the basic circuit s required for two PWM control circuits . Complete synchronization is obtained by using the same oscillator output wav eform. This IC can.
Manufacture

Fujitsu

Datasheet
Download MB3775 Datasheet




 MB3775
FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27204-3E
ASSP
SWITCHING REGULATOR
CONTROLLER
MB3775
LOW VOLTAGE DUAL PWM SWITCHING
REGULATOR CONTROLLER
The MB3775 is a dual pulse-width-modulation control circuit. It contains the basic
circuits required for two PWM control circuits. Complete synchronization is
obtained by using the same oscillator output waveform.
This IC can provide following types of output voltage: step down, step up, and
inverter. Power consumption is low, thus the MB3775 is ideal for use in high-
efficiency portable equipment.
Wide supply voltage range: 3.6 V to 18 V
Low current consumption: 1.3 mA typical
Wide oscillation frequency range: 1 kHz to 500 kHz
On-chip timer latch short protection circuit
On-chip under voltage lockout protection
On-chip reference voltage: 1.28 V
Variable dead time provides control over total operating range.
(DIP-16P-M04)
(FPT-16P-M06)
ABSOLUTE MAXIMUM RATINGS (see NOTE)
(Ta = 25°C)
Rating
Symbol
Condition
Value
Unit
Power Supply Voltage
VCC
20 V
Error Amp. Input Voltage
VI
-0.3 to +10 V
Collector Output Voltage VO
20 V
Collector Output Current
IO
75 mA
Ta 25 °C(SOP)
*620
mW
Power Dissipation
PD Ta 25 °C(DIP) 1000
mW
Ta 25°C(VSOP)
*430
mW
Operating Temperature TOP
-30 to +85 °C
Storage temperature
Tstg
-55 to+125 °C
*: The packages are mounted on the epoxy board (4 cm x 4 cm x 1.5 mm)
NOTE : Permanent device damage may occur if the above Absolute Maximum
Ratings are exceeded. Functional operation should be restricted to the
conditions as detailed in the operational sections data sheet. Exposure
to absolute maximum rating conditions for extended periods may affect
device reliability.
(FPT-16P-M05)
PIN ASSIGNMENT
(TOP VIEW)
CT
RT
+IN1
-IN1
FB1
D.T.C.1
OUT1
E/GND
1
2
3
4
5
6
7
8
16 VREF
15 SCP
14 +IN2
13 -IN2
12 FB2
11 D.T.C.2
10 OUT2
9 VCC
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.
1




 MB3775
MB3775
s BLOCK DIAGRAM
VREF=1.28V
16
Error Amp 1
3+
4_
5
12
Error Amp 2
14 +
13 _
15
9
VCC
Reference
Voltage
2.5V
1.9V -
1.3V -
+ S.C.P. Comp
_+
1.1V
2.5V
1µA
SR
Latch
R
U.V.L.O.
+
+
_
D.T.C. Comp
12
Triangular
Waveform
+__
PWM Comp 1
+__
PWM Comp 2
OUT 1
OUT 2
7
10
1.28V
0.9V 0.9V
1.8V
8
GND
6 11
s RECOMMENDED OPERATING CONDITIONS
Parameter
Power Supply Voltage
Error Amp. Input Voltage
Collector Output Voltage
Collector Output Current
Phase Compensation Capacitor
Timing Capacitor
Timing Resistor
Oscillator Frequency
Reference Voltage Output Current
Operating Temperature
Symbol
VCC
VI
VO
IO
CP
CT
RT
fOSC
IREF
TOP
Min
3.6
-0.2
0.3
150
5.1
1
-3
-30
Value
Typ
6.0
0.1
-1
25
Max
18
1.45
18
50
15000
100
500
85
Unit
V
V
V
mA
µF
pF
k
kHz
mA
°C
2




 MB3775
MB3775
s OPERATION DESCRIPTION
1. Reference voltage
The reference voltage circuit generates a stable, temperature-compensated 2.5 V reference from Vcc (pin 9) for use by internal
circuits.
A reference voltage of temperature compensated 1/2 Vref can be obtained to external circuit by Vref terminal (pin 16).
2. Oscillator
A triangular waveform of any frequency is obtained by connecting an external capacitor and resistor to the CT (pin 1) and RT
terminals (pin 2).
The amplitude of this waveform is from 1.3 V to 1.9 V. The oscillator is internally connected to the non-inverting inputs of the
PWM comparators. The oscillator waveform is available at the CT terminal.
3. Error amplifiers
The error amplifier detects the output voltage of the switching regulator.
The common-mode input voltage range is -0.2 V to 1.45 V, so the input reference voltage can be set the VREF and GND levels.
Error amplifiers can be used as either inverting and non-inverting amplifiers.
The voltage gain is fixed. Phase compensation is possible by connecting a capacitor to the FB terminals (pins 5 and 12) of the
error amplifiers.
The error amplifier output are internally connected to the inverting inputs of the PWM comparators and also to the short protection
circuit.
4. Timer latch short protection circuit
The timer latch short protection circuit detects the output levels of the error amplifiers. If one or both error amplifier outputs are
1.1 V or lower, the timer circuit begins charging the externally connected protection enable capacitor.
If the output level of the error amplifier does not drop below the normal voltage range before the capacitor voltage reaches the
transistor base-emitter voltage VBE ( 0.65 V), the latch circuit turns the output drive transistor off and sets the dead time to 100 %.
5. Under voltage lockout protection circuit
An ambiguous transition state at power-on or a momentary fluctuation in the supply line may result in loss of control and may
adversely affect or even destroy the system. The under voltage lockout protection circuit compares the internal reference voltage
level with the supply voltage level. If the supply voltage level falls below the reference level the latch circuit is reset the output
drive transistor is turned off and the dead time is set to 100 %. The protection enable terminal (pin 15) is pulled “Low”.
6. PWM comparator
Each PWM comparator has two inverting inputs and one non-inverting input. This voltage-to-pulse-width converter controls the
output pulse width according to the input voltage.
The PWM comparator turns the output drive transistor on when the oscillator triangular waveform is higher than the error amplifier
output and the dead time control terminal voltage.
7. Output drive transistor
The open-collector output-drive transistors provide common-emitter output of 18 V dielectric capability. The output drive tran-
sistors can source up to 50 mA of drive current to the switching power transistor.
3




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