FHP3132 Просмотр технического описания (PDF) - Fairchild Semiconductor

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FHP3132

Single and Dual, High-Speed, Rail-to-Rail Amplifiers

Fairchild Semiconductor 

Application Information

Driving Capacitive Loads

The Frequency Response vs. CL plot in Figure 10

illustrates the response of the FHP3132/3232. A small

series resistance (Rs) at the output of the amplifier,

illustrated in Figure 26, improves stability and settling

performance. Rs values in the Frequency Response vs.

CL plot were chosen to achieve maximum bandwidth with

less than 1dB of peaking. For maximum flatness, use a

larger Rs.

+

-

Rf

Rg

Rs

CL RL

Figure 26. Typical Topology for Driving

Capactive Loads

Power Dissipation

The maximum internal power dissipation allowed is

directly related to the maximum junction temperature. If

the maximum junction temperature exceeds 150°C for an

extended time, device failure may occur.

The FHP3132 and FHP3232 are short-circuit protected;

however, this may not guarantee that the maximum

junction temperature (+150°C) is not exceeded under all

conditions. RMS power dissipation can be calculated

using the following equation:

PD = Is * (Vs+ - Vs-) + (Vs+ - Vo(RMS)) * IOUT(RMS)

EQ. 1

where:

Is = the supply current

Vs+ = the positive supply pin voltage

Vs- = the negative supply pin voltage

Vo(RMS) = the RMS output voltage

IOUT(RMS) = the RMS output current delivered to the load.

Follow the maximum power derating curves shown in

Figure 27 to ensure proper operation.

1.6

1.4

TSSOP-14

1.2

SOIC-14

1.0

SOIC-8

0.8

0.6

MSOP-8

0.4

SOT23-5

0.2

0

-40 -20 0 20 40 60 80

Ambient Temperature (°C)

Figure 27. Maximum Power Derating

Overdrive Recovery

For an amplifier, an overdrive condition occurs when the

output and/or input ranges are exceeded. The recovery

time varies based on whether the input or output is overdriven

and by how much the ranges are exceeded. The

FHP3132/3232 typically recovers in less than 50ns from

an overdrive condition. Figure 28 shows the FHP3132 in

an overdriven condition.

3.5

Vs = 3V

3.0 G = 10

RL = 2kΩ

2.5

Output

2.0

1.5

1.0

Input

0.5

0

-0.5

0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2

Time (μs)

Figure 28. Overdrive Recovery

© 2007 Fairchild Semiconductor Corporation

11

FHP3132, FHP3232 Rev. 1.0.0

www.fairchildsemi.com

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