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AN8049SH Fiches technique(PDF) 25 Page - Panasonic Semiconductor

No de pièce AN8049SH
Description  1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC
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Fabricant  PANASONIC [Panasonic Semiconductor]
Site Internet  http://www.panasonic.com/industrial/
Logo PANASONIC - Panasonic Semiconductor

AN8049SH Fiches technique(HTML) 25 Page - Panasonic Semiconductor

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Voltage Regulators
AN8049SH
25
s Application Notes (continued)
[10] Notes on power supply printed circuit board design
Careful attention must be paid to the following points when designing the printed circuit board layout to achieve
low noise and high efficiency.
1. Use extremely wide lines for the ground lines, and isolate the IC ground from the power system ground.
In particular, during light-load operation (when the on-duty is low) switching noise can enter the system at the
lower limit of the sawtooth waveform causing the operating frequency to vary every period and resulting in
unstable control.
Take measures described as 1) and 2) below, and assure that switching noise does not appear on the sawtooth
waveform.
1) Use a ground line separate from the power system ground for the capacitor and resistor connected to the OSC
pin.
2) Lower the OSC pin impedance by either decreasing the value of the resistor RT or increasing the value of the
capacitor CT.
(See the figures below.)
2. Position input filter capacitors as close as possible to the VCC and ground pins.
If switching noise cannot be suppressed even with exceptionally large capacitors, or if there are limitations on
the size of capacitors that can be used, install an CR filter in the input to reduce switching noise. Problems may
occur if switching noise enters the IC by any route.
3. Keep the length of the line between the OUT pin and the switching device as short as possible to provide a clean
switching waveform to the switching device.
4. Use longer lines for the low-impedance side of the output voltage detection resistors.
VIN
VOUT
RT
CT
GND
Common impedance
VIN
VOUT
RT
CT
GND
(1) Use separate lines.
(2) Modify the
values of the
capacitor and
resistor.
Q1
Lower limit voltage
of the sawtooth wave
during stable operation
Small
Large
The frequency changes at each period.
Noise is picked up
and the IC switches
from charge to
discharge operation.
Q1


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