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LM122 数据表(PDF) 5 Page - National Semiconductor (TI) |
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LM122 数据表(HTML) 5 Page - National Semiconductor (TI) |
5 / 14 page 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 |
类似零件编号 - LM122 |
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类似说明 - LM122 |
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