MB3782_1 datasheet, PDF - EEWORLD Datasheet

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MB3782_1: Description0.075 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP20; CategoryPower/power management; File Size147KB，27 Pages; ManufacturerFUJITSU; Websitehttp://edevice.fujitsu.com/fmd/en/index.html

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MB3782_1 Overview

0.075 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP20

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FUJITSU SEMICONDUCTOR

DATA SHEET

DS04-27205-5E

ASSP Power Supplies

BIPOLAR

Switching Regulator Controller

MB3782

DESCRIPTION

The FUJITSU MB3782 is a PWM-type switching regulator controller, designed with open-collector output for

connection to external drive transistors and coils, providing a selection of three types of output voltage: step-up,

step-down or inverting (inverting output is available on one circuit only).

The MB3782 features identical oscillator output waveforms to enable completely synchronous operation and

prevent the occurrence of low-frequency beat between channels.

Also, the MB3782 features low power dissipation (2.1 mA Typ) and a built-in standby mode (10

µA),

making

possible the configuration of a wide variety of high-efficiency, stable power supplies, even with the use of battery

power. The MB3782 is an ideal power supply for high-performance portable devices such as video camcorders

and cameras.

FEATURES

•

Wide voltage range (3.6 V to 18 V)

Low power dissipation (operating mode: 2.1 mA (Typ), standby mode: 10

µA

(Max)

Wide range of oscillator frequencies, high-frequency capability (1 to 500 kHz)

On-chip timer-latch type short detection circuit

On-chip undervoltage lockout circuit

On-chip 2.50 V reference voltage circuit (1.25 V output available at R

pin)

Dead time adjustment over full duty cycle range

On-chip standby mode (power on/off function)

PACKAGE

Plastic DIP 20 pin

Plastic SOP 20 pin

(DIP-20P-M01)

(FPT-20P-M01)

MB3782

FUNCTIONAL DESCRIPTIONS

1. Reference Voltage Source

The reference voltage source uses the voltage provided at the power supply pin (pin 20) to generate a temper-

ature-compensated reference voltage (≅ 2.50 V), which is used as the operating power supply for the internal

circuits of the IC. The reference voltage source can be output through the V

REF

pin (pin 1).

2. Triangular Wave Oscillator

By connecting a timing capacitor and resistor respectively to the C

pin (pin 2) and R

pin (pin 3), the oscillator

can provide a triangular waveform at any desired frequency.

The waveform has an amplitude of 1.3 V to 1.9 V, and can be connected to the non-inverting input of the on-

chip PWM comparator and also output through the C

pin.

3. Error Amps

The error amps are amplifiers that detect the output voltage of the switching regulator and send the PWM control

signal. The common-mode input voltage range is 1.05 V to 1.45 V, so that the voltage applied to the non-inverting

input pin as a reference voltage should be either the voltage obtained by dividing the IC reference voltage output

(recommended value: V

REF

/2) or the voltage obtained from the R

pin (1.25 V). The non-inverting input for the

error amps 1 and 2 is internally connected to V

REF

/2 voltage.

Also, a feedback transistor and capacitor can be connected between the error amp output pin and inverting input

pin to provide any desired level of loop gain, enabling stable phase compensation.

4. Timer Latch (S-R Latch) Type Short Prevention Circuit

The timer-latch type short prevention circuit detects the output levels from each of the error amps. Whenever

one or more error amps produces an output level of 2.1 V or higher, the timer circuit is activated starting the

charging of the external protection enabler capacitor.

If the error amp output voltage does not return to normal range before the voltage in this capacitor reaches the

transistor’s base-emitter junction voltage (V

(≅ 0.65 V)), the latch circuit will operate to turn the output transistor

off and at the same time set the dead time to 100%.

Once the prevention circuit is activated, the power must be switched on again to resume normal operation.

5. Low Input Voltage Fault Prevention Circuit (Under Voltage Lock-Out (UVLO) function)

When power is switched on, excess power or momentary drops in power line current can cause operating faults

in the controller IC, which can in turn lead to damage or deterioration in systems.

The low input voltage fault prevention circuit detects the internal reference voltage level with respect to the power

supply voltage level and acts to reset the latch circuit, thereby turning the output transistor off and at the same

time setting the dead time to 100% and holding the SCP pin (pin 14) at “low.” Operation returns to normal when

the power supply voltage reaches or exceeds the UVLO threshold voltage level.

6. PWM Comparator

The PWM comparator is a voltage comparator with one inverting and two non-inverting inputs, which acts as a

voltage to pulse width converter controlling the on-time of the output pulse according to the input voltage level.

When the triangular waveform produced by the oscillator is lower than either the error amp output or the DTC

pin voltage, the output transistor is switched on.

It is also possible to use the DTC terminal to provide a soft start function.

7. Output Transistor

The output is open-collector type, with the emitter of the output transistor connected to the GND pin. The power

transistor for external switching can carry a base current of up to 50 mA.

8. Power Supply Control

Power supply on/off control is enabled through the CTL pin (pin 19). (In standby mode, power supply current is

µA

or less.)

MB3782_1 Related Products

	MB3782_1	MB3782	MB3782P	MB3782PF
Description	0.075 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP20	0.075 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP20	0.075 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP20	0.075 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP20

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