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LM340 Scheda tecnica(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM340
Spiegazioni elettronici  Series 3-Terminal Positive Regulators
Download  15 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM340 Scheda tecnica(HTML) 8 Page - National Semiconductor (TI)

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Application Hints (Continued)
the output high can cause damage to internal low current
paths in a manner similar to that just described in the “Short-
ing the Regulator Input” section.
Regulator Floating Ground (
Figure 2): When the ground
pin alone becomes disconnected, the output approaches the
unregulated input, causing possible damage to other circuits
connected to V
OUT. If ground is reconnected with power
“ON”, damage may also occur to the regulator. This fault is
most likely to occur when plugging in regulators or modules
with on card regulators into powered up sockets. Power
should be turned off first, thermal limit ceases operating, or
ground should be connected first if power must be left on.
Transient Voltages: If transients exceed the maximum
rated input voltage of the device, or reach more than 0.8V
below ground and have sufficient energy, they will damage
the regulator. The solution is to use a large input capacitor, a
series input breakdown diode, a choke, a transient suppres-
sor or a combination of these.
When a value for
θ
(H–A) is found using the equation shown,
a heatsink must be selected that has
a value that is less than
or equal to this number.
θ
(H–A) is specified numerically by the heatsink manufacturer
in this catalog, or shown in a curve that plots temperature
rise vs power dissipation for the heatsink.
HEATSINKING TO-263 AND SOT-223 PACKAGE PARTS
Both the TO-263 (“S”) and SOT-223 (“MP”) packages use a
copper plane on the PCB and the PCB itself as a heatsink.
To optimize the heat sinking ability of the plane and PCB,
solder the tab of the plane.
shows for the TO-263 the measured values of
θ
(J–A) for dif-
ferent copper area sizes using a typical PCB with 1 ounce
copper
and no solder mask over the copper area used for
heatsinking.
As shown in the figure, increasing the copper area beyond 1
square inch produces very little improvement. It should also
be observed that the minimum value of
θ
(J–A) for the TO-263
package mounted to a PCB is 32˚C/W.
As a design aid,
Figure 5 shows the maximum allowable
power dissipation compared to ambient temperature for the
TO-263 device (assuming
θ
(J–A) is 35˚C/W and the maxi-
mum junction temperature is 125˚C).
DS007781-8
FIGURE 1. Input Short
DS007781-9
FIGURE 2. Regulator Floating Ground
DS007781-10
FIGURE 3. Transients
DS007781-39
FIGURE 4.
θ
(J–A) vs Copper (1 ounce)
Area for the TO-263 Package
DS007781-40
FIGURE 5. Maximum Power Dissipation vs
T
AMB for the TO-263 Package
www.national.com
8


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