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LM196K Scheda tecnica(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM196K
Spiegazioni elettronici  LM196/LM396 10 Amp Adjustable Voltage Regulator
Download  14 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM196K Scheda tecnica(HTML) 9 Page - National Semiconductor (TI)

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Typical Performance Characteristics (Continued)
Load Transient Response
TLH9059 – 9
With no adjustment pin bypass For output volt-
ages other than 5V multiply vertical scale by
VOUT 5
Typical Applications (Continued)
TLH9059 – 10
Regulation can be improved by adding an LM336 reference diode to increase the effective reference
voltage to 375V Load and line regulation are improved by 31 including thermal effects
FIGURE 3 Improving Regulation
TLH9059 – 11
R3 is selected to supply partial load current Therefore a minimum load
must always be maintained to prevent the regulated output from rising un-
controlled R3 must be greater than (VMAX b VOUT)IMIN where VMAX is
worst-case high input voltage and IMIN is the minimum load current R3
must be rated for at least (VIN b VOUT)2 R3 watts Regulator power dissipa-
tion will be reduced by a factor of 2–3 in a typical situation where minimum
load current is 12 full load current Regulator dissipation will peak at
VIN e
(R3)(IOUT)
2
a
VOUT
and will be equal to
PMAX e
(R3)(IOUT)2
4
Assuming (R3)(IOUT) s VMAX b VOUT
A few words of caution (1) R3 power rating must be increased to (VMAX)2
R3 if continuous output shorts are possible (2) Under normal load condi-
tions system power dissipation is not changed but under short circuit condi-
tions
system power dissipation increases by (VIN)2 R3 watts over the al-
ready high power of a shorted regulator The LM196 will not be harmed and
neither will R3 if it is rated properly but the raw supply components must be
able to withstand the overload also Thermal shutdown of the LM196 will
probably occur for sustained shorts somewhat alleviating the problem
FIGURE 4 Reducing Regulator Power Dissipation
9


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