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PDF MB3788 Data sheet ( Hoja de datos )
| Número de pieza | MB3788 | |
| Descripción | SWITCHING REGULATOR CONTROLLER | |
| Fabricantes | Fujitsu Media Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MB3788 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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FUJITSU SEMICONDUCTOR
DATA SHEET
DS04-27209-1E
ASSP
SWITCHING REGULATOR
CONTROLLER
MB3788
s DESCRIPTION
The MB3788 is a dual-channel PWM-type switching regulator controller; it in-
corporates 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, saw-
tooth 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 cam-
corder or notebook personal computer (word processDoar)t.aSheet4U.com
s 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
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
24-PIN PLASTIC SSOP
DataShee
(FPT-24P-M03)
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 appli-
cation of any voltage higher than maximum rated voltages to
this high impedance circuit.
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MB3788
s 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.
et4U.com
(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 DataSheet4U.com
Channels can be set ON/OFF by combining the voltage levels at pin CTL1 (pin 13) and pin CTL2 (pin 14).
DataShee
Channel ON/OFF Setting Conditions
Voltage level at CTL pin
CTL1
L
H
CTL2
×
H
L
Channel ON/OFF status
Power circuit Channel 1 Channel
Stand by state*
ON
ON
OFF
*The power current in the standby state is 10 µA max.
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MB3788
et4U.com
7. Duty - input oscillating frequency characteristic
100
Input waveform
80
1.9V
1.3V
VCC = 6 V
VFB = 1.6 V
TA = +25°C
60
Duty
Dtr (%)
40
8.Gain - frequency characteristic and phase - frequency
characteristic
40 TA = +25°C 180
20
Gain
(dB)
0
90
Phase
0 φ (deg)
20
0
05 K10 K50 K100 K500 K1 M
Input oscillating frequency (Hz)
-20
-40
1 K 10 K100 K1 M5 M10 M
f (Hz)
-90
-180
9. Power dissipation - ambient temperature characteristic
1000
800
Circuit for measuring gain - frequency characteristic and
phase - frequency characteristic
2.5 V 2.5 V
VCC = 6 V
240 kΩ
Power 600
dissipation
PD (mW)
400
200
4.7 kΩ 4.7 kΩ
DataSheet4U.com 10 µF
in - +
4.7 kΩ 4.7 kΩ
-
+
Error amplifier
out
0
-20 020 4060 80 100
Ambient temperature TA (°C)
DataShee
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11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet MB3788.PDF ] | |
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