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LM122 データシート(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM122
部品情報  Precision Timers
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM122 データシート(HTML) 5 Page - National Semiconductor (TI)

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Functional Diagram
TLH7768 – 9
Timing Diagram
TLH7768 – 10
Pin Function Description
One of the main features of the LM122 is its great versatility
Since this device is unique a description of the functions
and limitations of each pin is in order This will make it much
easier to follow the discussion of the various applications
presented in this note
V
a
is the positive supply terminal of the LM122 When us-
ing a single supply this terminal may be driven by any volt-
age between 45V and 40V The effect of supply variations
on timing period is less than 0005%V so supplies with
high ripple content may be used without causing pulse width
changes Supply bypassing on Va is not generally needed
but may be necessary when driving highly reactive loads
Quiescent current drawn from the Va terminal is typically
25 mA independent of the supply voltage Of course addi-
tional current will be drawn if the reference is externally
loaded
The VREF pin is the output of a 315V series regulator refer-
enced to the ground pin Up to 50 mA can be drawn from
this pin for driving external networks In most applications
the timing resistor is tied to VREF but it need not be in
situations where a more linear charging current is required
The regulated voltage is very useful in applications where
the LM122 is not used as a timer such as switching regula-
tors variable reference comparators and temperature con-
5


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