• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 48 subscribers
  • Views 329 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLC251, TCL251A

Tm Ampac
Prodigy 10 points
Other Parts Discussed in Thread: TLC251, TLV2370, TLV2460

In Single-supply mode with VDD=12V, Vdd- at GND, and set for "High-bias mode", What output current can this opAmp drive a 10K load to ?    Can it drive a 10K load to 10v at 1mA ?   Doesn't look like it can do it, since typ Idd is 1mA in high-bias-mode.  The 18-page datasheet does not seem to cover its output drive ability in a direct fashion.

  • 0
    TI__Guru* 93105 points

    Hello Tim,

    The TLC251 is a legacy product (1983) and the only information I have is the data sheet. Despite that, there may be enough information in the data sheet to get an idea of its output current drive capability. Since you are interested in operating the TLC251 in high-current mode, I'll focus on that condition.

    It doesn't appear that the TLC251 was designed as a high output current amplifier, but rather one having the programmable operating current feature. The fact that the VOH output levels are specified with a 10 k resistor only, and not with as 2 k load too, tends to confirm that the output current drive capability may be low.

    The minimum VOH with a 10 k load and the +10 V supply, in the high-current mode, is specified as +8 V (25 C) and provides an IOH of 800 uA. If the supply is increased to +12 V and the load remains at 10 k, we might expect that VOH would still swing to with 2 V of the supply rail, or to +10 V. In that case the current would be 1 mA. The output drive capability of CMOS operational amplifiers does tend to increase with increased supply voltage so the TLC251 would likely be able to supply the 1 mA for that case. However, because the data sheet does not specifically indicate that it will no assurances can be made.

    If you do not plan to use the programmable features of the TLC251 and the operating current is the range you need, there are other TI CMOS operational amplifiers that will easily provide the 1 mA. Some other amplifiers you may want to consider are the TLV2370, and TLV2460. If you have other requirements, let me know.

    http://www.ti.com/lit/ds/symlink/tlv2370.pdf

    http://www.ti.com/lit/ds/symlink/tlv2460.pdf 

    Regards, Thomas

    PA - Linear Applications Engineering