MB3782 Fujitsu Media Devices, MB3782 Datasheet - Page 10

• Manufacturer Part Number: MB3782
• Description: Switching Regulator Controller
• Manufacturer: Fujitsu Media Devices

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DataSheet
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USING THE R
The triangular waves, as shown in Figure 1, act to set the oscillator frequency by charging and discharging the
capacitor connected to the C
In addition, when voltage level V
the external circuit connections to adjust for the fact that I
external circuits in determining the oscillator frequency (see Figure 2).
T
Figure 1
PIN
To external circuits
Figure 2
T
No V
pin using the current value of the resistor connected to the R
REF
V
V
/2 is output to external circuits from the R
REF
REF
2
REF
Triangular wave oscillator
/2 connection to external circuits from R
/2 connection to external circuits from R
2
R
V
I
RT
T
REF
2
I
Triangular wave generator
RT
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2
R
1
I
T
RT
I
1
C
T
I
CT
1
1
is increased by the value of the current I
C
T
I
CT
I
CT
= V
= I
RT
2R
REF
T
T
I
pin, care must be taken in making
CT
= I
= I
=
1
RT
T
T
V
2R
+ I
REF
pin
pin
T
2
+ I
2
T
pin.
2
to the