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AN8049SH Fiches technique(PDF) 21 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) 21 Page - Panasonic Semiconductor

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Voltage Regulators
AN8049SH
21
s Application Notes (continued)
[6] Setting the maximum duty
The maximum duty is set to 86% internally to the IC. However, this setting can be changed to be any value in the
range 0% to 100% by adding an external resistor.
1. To use a duty lower than the current duty (80% to 92%)
Insert the resistor RDT between the DT pin and ground.
Determine the DT pin voltage for the required duty from the provided DT pin voltage vs. maximum on-duty
characteristics in the "[2] Main characteristics" section and determine the value of the external resistor RDT from
formula A.
Note that there is a sample-to-sample variation of
−19% to +33% due to temperature characteristics and sample-
to-sample variations of the internal resistors R1 and R2. (However, the direction of the sample-to-sample varia-
tions is identical for R1 and R2.) Determine the size of the sample-to-sample variations in the DT pin voltage VDT
from formula B, and estimate the size of the sample-to-sample variation in the duty from the provided DT pin
voltage vs. maximum on-duty characteristics in the "[2] Main characteristics" section .
··········A
VDT =
R2/RDT
×V
REF
··········B
R1+R2/RDT
ch.1, 2
ch.3
R1
45 k
Ω 44 kΩ
R2
55 k
Ω 56 kΩ
2. To use a duty higher than the current duty (80% to 92%)
Insert the resistor RDT between the DT pin and the VREF pin.
Use formulas C and D to determine the value of the external resistor RDT and the size of the sample-to-sample
variations in the same manner as in item 1 above.
··········C
VDT =
R2
×V
REF
··········D
R2+R1/RDT
RDT =
VDT
VREF − ( 1 + 1 ) × V
DT
R1
R1 R2
RDT =
VREF−VDT
(
1 + 1 ) × V
DT
VREF
R1 R2
R1
R1
R2
VREF
1.26 V
DT
RDT
R1
R2
VREF
1.26 V
DT
RDT


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