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LA5683T

4ch Switching Regulator Control IC

SANYO -> Panasonic 

LA5683T

CT1 and CT2

The waveform of CT1 is 180 degrees out of phase with that of CT2. Their frequency cannot be set independently.

The capacitance of the capacitors to be connected to pins CT1 and CT2 must be the same.

• Setting the oscillation frequency

(1) The oscillation frequency of the oscillator can be set by selecting the capacitance of the capacitors connected to

pins CT1 and CT2 (see Figure 1).

(2) The oscillation frequency can also be determined by the resistance of the resistor connected to the RT pin

(see Figure 2).

Figure 1 Oscillation Frequency vs.

Timing Capacitance Characteristics

2000

Reference data

Ta=25°C

1800

VCC=3.0V

RT=5.6kΩ

1600

CT1 and CT2 have the

1400

same capacitance.

1200

1000

800

600

400

200

0

7 100

23

5 7 1k

23

5 7 10k

Capacitors CT1 and CT2 Capacitance - pF ILA07008

Figure 2 Oscillation Frequency vs.

Timing Resistance Characteristics

1400

Reference data

Ta=25°C

VCC=3.0V

1200

CT1/CT2=560pF

1000

800

600

400

200

0

1.0

2

3

5 7 10

2

Resistor RT Resistance - kΩ

3

5

ILA07009

Sample Circuits

Sample Circuit That Makes Use of VBIAS (1)

This IC can be used to implement the circuit that is shown below since the power to the channels 3 and 4 output stages

is supplied via VBIAS.

Apply VO1 that is dropped to 3.3V in channel 1 to VBIAS. A voltage of approx. VBIAS3-1 volt develops at VOUT3,

so that the IC can drive MOS transistors in a low-voltage environment like this sample circuit.

VBIAS

SW

VBIAS Circuit Example 1

VCC

L Schottky barrier diode

VO3=3.3V

OUT3

VOUT3

MCH3409

to IN3−

VCC

Schottky barrier diode

MCH3309

L VO1=3.3V

to IN1−

to OUT1

No.8214-10/12

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