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PDF MB3769A Data sheet ( Hoja de datos )
| Número de pieza | MB3769A | |
| Descripción | SWITCHING REGULATOR CONTROLLER | |
| Fabricantes | Fujitsu | |
| Logotipo |  |
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27202-3E
ASSP
SWITCHING REGULATOR
CONTROLLER
MB3769A
The Fujitsu MB3769A is a pulse-width-modulation controller which is applied to
fixed frequency pulse modulation technique. The MB3769A contains wide band
width Op-Amp and high speed comparator to construct very high speed switching
regulator system up to 700 kHz. Output is suitable for power MOS FET drive
owing to adoption of totem pole output.
The MB3769A provides stand-by mode at low voltage power supply when it is
applied in primary control system.
• High frequency oscillator (f = 1 to 700 kHz)
• On-chip wide band frequency operation amplifier (BW = 8 MHz typ.)
• On-chip high speed comparator (td = 120 ns typ.)
• Internal reference voltage generator provides a stable reference supply
(5 V ± 2%)
• Low power dissipation (1.5 mA typ. at standby mode, 8 mA typ. at operating
mode)
• Output current ± 100 mA (± 600 mA at peak)
• High speed switching operation (tr = 60 ns, tf = 30 ns, CL = 1000 pF typ.)
• Adjustable Dead-time
• On-chip soft start and quick shut down functions
• Internal circuitry prohibits double pulse at dynamic current limit operation
• Under voltage lock out function (OFF to ON: 10 V typ. ON to OFF: 8 V typ.)
• On-chip output shut down circuit with latch function at over voltage
• On-chip Zener diode (15 V)
PLASTIC DIP 16-PIN
(DIP-16P-M04)
PLASTIC FPT 16-PIN
(FPT-16P-M06)
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
1 page  
MB3769A
s ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Condition
Output Voltage
Reference
Section
Input Regulation
Load Regulation
Temp. Stability
Short Circuit Output Current
Oscillator Frequency
Oscillator
Section Voltage Stability
Temp. Stability
VREF
∆ VRIN
∆ VRLD
∆ VRTEMP
ISC
fOSC
∆ fOSCIN
∆ fOSC /∆ T
IREF = 1 mA
12 V ≤ VCC ≤ 18 V
1 mA ≤ IREF ≤10 mA
-30 °C ≤ TA ≤ 85 °C
VREF = 0 V
RT=18 kΩ
CT=680 pF
12 V ≤ VCC ≤ 18 V
-30 °C ≤ TA ≤ 85 °C
Input Bias Current
ID
Max. Duty Cycle
Dead -time Duty Cycle Set
Control
Section Input
0% Duty
Cycle
Threshold
Voltage
Max. Duty
Cycle
Dmax
Dset
VDO
VDM
Discharge Voltage
VDH
Input Offset Voltage
VIO (OP)
Input Offset Current
IIO (OP)
Input Bias Current
IIR (OP)
Error
Amplifier
Section
Common-Mode Input Voltage
Voltage Gain
Band Width
Slew Rate
VCM (OP)
AV (OP)
BW
SR
Common-Mode Rejection Rate CMR
“H” Level Output Voltage
VOH
“L” Level Output Voltage
VOL
Vd = 1.5 V
Vd = 0.5 VREF
-
-
VCC= 7 V,
IDTC= -0.3 mA
V3 = 2.5 V
V3 = 2.5 V
V3 = 2.5 V
12 V ≤ VCC ≤ 18 V
0.5 V ≤ V3 ≤ 4 V
AV = 0dB
RL = 10 kΩ, AV = 0dB
VIN = 0 to 10 V
I3 = -2 mA
I3 = 0.3 mA
(VCC=15V, TA=25°C)
Value
Unit
Min Typ Max
4.9 5.0 5.1 V
- 2 15 mV
- -1 -15 mV
- ±200 ±750 µV/ °C
15 40
- mA
90 100 110 kHz
- ±0.03 -
- ±2 -
%
%
- 2 10 µA
75 80 85 %
45 50 55 %
- 3.5 3.8 V
1.55 1.85
-
V
4.5 -
-V
- ±2 ±10 mV
- ±30 ±300 nA
-1 -0.3 - µA
-0.2 - VCC -3 V
70 90
- dB
- 8 - MHz
- 6 - V/µs
65 80
- dB
4.0 4.6 - V
- 0.1 0.5 V
5
5 Page 
MB3769A
4. Triangular Wave Oscillator
The oscillation frequency is expressed by the following formula:
fOSC ~
1
0.8 x CT x RT + 0.0002 ms
[kHz] CT
RT
:µF
:kΩ
For master/slave synchronized operation of several MB3769As, the CT and RT terminals of the master MB3769A are connected
in the usual way and the CT terminals of the master and slave device (s) are connected together. The slave MB3769A’s RT
terminal is connected to it’s VREF terminal to disable the slave’s oscillator. In this case, set 50/n kΩ (n is the number of master
and slave ICs) to the upper limit of RT so that internal bias currents do not stop the master oscillation.
Fig. 7 - MB3769A Synchronized Operation
master
RT CT
VREF
slave
RT
CT
5. Overvoltage Detector
The overvoltage detection circuit shuts the system power down if the switching regulator’s output voltage is abnormal or if
abnormal voltage is appeared. The reference voltage is 2.5 V (VREF /2). The system power is shut down if the voltage at pin
13 rises above 2.5 V. The output is kept shut down by the latching circuit until the power supply is turned off (see Figure 3).
6. Stand-by Mode and Under-Voltage Lockout (UVLO)
Generally, VGS > 6 to 8 V is required to use power MOSFET for switching. UVLO is set so that output is on at VCC ≥ 10 V
(standard) when the power is turned on and is off at VCC ≤ 8 V (standard) when the power is turned off.
In the stand-by mode, the power supply current is limited to 2 mA or less when the output is inhibited by the UVLO circuit. When
the MB3769A is operated from the 100 VAC line, the power supply current is supplied through resistor R (Figure 8). That is, the
IC power supply current is supplied by the AC line through resistor R until operation starts. Current is then supplied from the
transformer tertiary winding, eliminating the need for a second power supply.
Two volts (typical) of hysteresis are provided for return from operation mode to stand-by mode not to return to stand-by mode
until output power is turned on or to avoid malfunction due to noise.
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet MB3769A.PDF ] | |
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