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LM2700LD-ADJ датащи(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM2700LD-ADJ
подробное описание детали  600kHz/1.25MHz, 2.5A, Step-up PWM DC/DC Converter
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2700LD-ADJ датащи(HTML) 11 Page - National Semiconductor (TI)

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Operation (Continued)
gin can also be improved by adding C
C2 as discussed earlier
in the section. The equation for A
DC is given below with
additional equations required for the calculation:
mc ) 0.072fs (in V/s)
where R
L is the minimum load resistance, VIN is the mini-
mum input voltage, g
m is the error amplifier transconduc-
tance found in the Electrical Characteristics table, and R
D-
SON
is the value chosen from the graph "R
DSON vs. VIN "in
the Typical Performance Characteristics section.
LAYOUT CONSIDERATIONS
The LM2700 uses two separate ground connections, PGND
for the driver and NMOS power device and AGND for the
sensitive analog control circuitry. The AGND and PGND pins
should be tied directly together at the package. The feed-
back and compensation networks should be connected di-
rectly to a dedicated analog ground plane and this ground
plane must connect to the AGND pin. If no analog ground
plane is available then the ground connections of the feed-
back and compensation networks must tie directly to the
AGND pin. Connecting these networks to the PGND can
inject noise into the system and effect performance.
The input bypass capacitor C
IN, as shown in Figure 3, must
be placed close to the IC. This will reduce copper trace
resistance which effects input voltage ripple of the IC. For
additional input voltage filtering, a 100nF bypass capacitor
can be placed in parallel with C
IN, close to the VIN pin, to
shunt any high frequency noise to ground. The output ca-
pacitor, C
OUT, should also be placed close to the IC. Any
copper trace connections for the C
OUT capacitor can in-
crease the series resistance, which directly effects output
voltage ripple. The feedback network, resistors R
FB1 and
R
FB2, should be kept close to the FB pin, and away from the
inductor, to minimize copper trace connections that can in-
ject noise into the system. Trace connections made to the
inductor and schottky diode should be minimized to reduce
power dissipation and increase overall efficiency. For more
detail on switching power supply layout considerations see
Application Note AN-1149: Layout Guidelines for Switching
Power Supplies.
Application Information
20012331
FIGURE 3. 600 kHz operation, 8V output
www.national.com
11


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