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LA5683T Datenblatt(PDF) 10 Page - Sanyo Semicon Device

Teilenummer LA5683T
Bauteilbeschribung  Monolithic Linear IC 4ch Switching Regulator Control IC
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Hersteller  SANYO [Sanyo Semicon Device]
Direct Link  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA5683T Datenblatt(HTML) 10 Page - Sanyo Semicon Device

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LA5683T
No.8214-10/12
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).
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.
to IN3−
VO3=3.3V
to OUT1
VCC
VBIAS Circuit Example 1
VBIAS
OUT3
SW
VO1=3.3V
to IN1−
VOUT3
MCH3409
L
MCH3309
VCC
Schottky barrier diode
L
Schottky barrier diode
100
1k
23
5
7
23
5
7
7
10k
0
600
800
200
400
2000
1800
1400
1600
1200
1000
ILA07008
Ta=25°C
VCC=3.0V
RT=5.6kΩ
10
23
5
7
23
1.0
5
0
600
800
200
400
1400
1200
1000
ILA07009
Ta=25°C
VCC=3.0V
CT1/CT2=560pF
Reference data
Reference data
Capacitors CT1 and CT2 Capacitance - pF
CT1 and CT2 have the
same capacitance.
Resistor RT Resistance - kΩ
Figure 1 Oscillation Frequency vs.
Timing Capacitance Characteristics
Figure 2 Oscillation Frequency vs.
Timing Resistance Characteristics


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