LM7171BIM National Semiconductor, LM7171BIM Datasheet - Page 4

• Manufacturer Part Number: LM7171BIM
• Description: Operational Amplifier (Op-Amp) IC
• Manufacturer: National Semiconductor

Specifications of LM7171BIM

• No. Of Amplifiers: 1
• Slew Rate: 4100V/µs
• No. Of Pins: 8
• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Mounting Type: Surface Mount
• Package / Case: 8-NSOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

MNLM7171AM-X-RH REV 0C0
Applications
DRIVING CAPACITIVE LOADS: Amplifiers driving capactive loads can oscillate or have ringing
at the output. To eliminate oscillation or reduce ringing, an isolation resistor can be
placed as shown on AN00005. The combination of the isolation resistor and the load
capacitor forms a pole to increase stability by adding more phase margin to the overall
system. The desired performance depends upon the value of the isolation resistor; the
bigger the isolation resistor, the more damped the pulse response becomes. For LM7171, a
50 Ohm isolation resistor is recommended for initial evaluation. Figure 6, in the
Commercial Data Book, shows the LM7171 driving a 150pF load with the 50 Ohm isolation
resistor.
POWER DISSIPATION: The maximum power allowed to dissipate in a device is defined as: Pd =
[Tj(max) - TA]/ThetaJA, where Pd (is the power dissipation in a device), Tj(max) (is the
maximum junction temperature), TA (is the ambient temperature), ThetaJA (is the thermal
resistance of a particular package).
For example, for the LM7171 in a J-8 package, the maximum power dissipation at 25 C
ambient temperature is 730mW.
Pq is the quiescent power dissipated in a device with no load connected at the output. Pl
is the power dissipated in the device with a load connected at the output; it is not the
power dissipated by the load.
Furthermore, Pq = supply current x total supply voltage with no load, Pl = output current
x (voltage difference between supply voltage and output voltage of the same side of supply
voltage).
For example, the total power dissipated by the LM7171 with Vs = <15V and output voltage of
10V into 1K Ohm is:
Pd
The total power dissipation in a device can be calculated as: Pd = Pq + Pl
=
=
=
=
Pq + Pl
(6.5mA)x(30V)+(10mA)x(15V - 10V)
195mW + 50mW
245mW
(Continued)
4
MICROCIRCUIT DATA SHEET