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LM26001 Datenblatt(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Teilenummer LM26001
Bauteilbeschribung  1.5A Switching Regulator with High Efficiency Sleep MODE
Download  16 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM26001 Datenblatt(HTML) 11 Page - National Semiconductor (TI)

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Design Information (Continued)
SETTING OUTPUT VOLTAGE
The output voltage is set by the ratio of a voltage divider at
the FB pin as shown in the typical application. The resistor
values can be determined by the following equation:
Where Vfb = 1.234V typically.
A maximum value of 150k
Ω is recommended for the sum of
R1 and R2.
As input voltage decreases towards the nominal output volt-
age, the LM26001 can skip up to seven off-pulses as de-
scribed in the Low Vin Operation section. In low output
voltage applications, if the on-time reaches Ton
MIN, the de-
vice will skip on-pulses to maintain regulation. There is no
limit to the number of pulses that are skipped. In this mode of
operation, however, output ripple voltage may increase
slightly.
INDUCTOR
The output inductor should be selected based on inductor
ripple current. The amount of inductor ripple current com-
pared to load current, or ripple content, is defined as Iripple/
Iload. Ripple content should be less than 40%. Inductor
ripple current, Iripple, can be calculated as shown below:
Larger ripple content increases losses in the inductor and
reduces the effective current limit.
Larger inductance values result in lower output ripple voltage
and higher efficiency, but a slightly degraded transient re-
sponse. Lower inductance values allow for smaller case
size, but the increased ripple lowers the effective current
limit threshold.
Remember that inductor value also affects the sleep mode
threshold as shown in Figure 3.
When choosing the inductor, the saturation current rating
must be higher than the maximum peak inductor current and
the RMS current rating should be higher than the maximum
load current. Peak inductor current, Ipeak, is calculated as:
For example, at a maximum load of 1.5A and a ripple content
of 40%, peak inductor current is equal to 1.8A which is safely
below the minimum current limit of 1.85A. By increasing the
inductor size, ripple content and peak inductor current are
lowered, which increases the current limit margin.
The size of the output inductor can also be determined using
the desired output ripple voltage, Vrip. The equation to de-
termine the minimum inductance value based on Vrip is as
follows:
Where Re is the ESR of the output capacitors, and Vrip is a
peak-to-peak value. This equation assumes that the output
capacitors have some amount of ESR. It does not apply to
ceramic output capacitors.
If this method is used, ripple content should still be verified to
be less than 40%.
OUTPUT CAPACITOR
The primary criterion for selecting an output capacitor is
equivalent series resistance, or ESR.
ESR (Re) can be selected based on the requirements for
output ripple voltage and transient response. Once an induc-
tor value has been selected, ripple voltage can be calculated
for a given Re using the equation above for Lmin. Lower
ESR values result in lower output ripple.
20179430
FIGURE 7. Example Circuit
1.5A Max, 305 kHz
www.national.com
11


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