NCS2211

http://onsemi.com

8

APPLICATIONS INFORMATION

The NCS2211 is unity gain stable and therefore does not

require any compensation, but a proper power-supply

bypass is required as shown in Figure 24. Performance will

be enhanced by adding a filter capacitor (C2) to the

mid-supply node (pin 2). See Typical Performance

Characteristics for details.

It is preferable to AC couple the input to avoid a large

DC output offset.

Both outputs can be driven to within 400 mV of either

supply rail with an 8

W load.

Typical Application of the Device:

6

Output (-)

VCC

Bias

(-) Input

Output (+)

Enable

-

+

-

+

R2

20k

R1

20k

C1

C2

0.1

mF

Figure 24.

+5 V

10

mF⎟⎟ 0.1 mF

C3

0.1

mF

5

8

1

7

2

4

3

Filtering

(+) Input

THERMAL CONSIDERATIONS

Care must be taken to not exceed the maximum junction

temperature of the device (150

°C). Figure 15 shows the

tradeoff between output power and junction temperature for

different areas of exposed PCB copper (2 oz). If the

maximum power is exceeded momentarily, normal circuit

operation will be restored as soon as the die temperature is

reduced. Leaving the device in an “overheated” condition

for an extended period can result in device burnout. To

ensure proper operation, it is important to observe the SOA

curves.

GAIN

Since the output is differential, the gain from input to the

THD will be optimized by pre-amplifying the signal and

BIAS FILTERING

Even though the NCS2211 will operate nominally with no

filter capacitor on pin 2, THD performance will be improved

dramatically with a filter capacitor installed (see Typical

Performance Characteristics). In addition a C2 filter

capacitor at pin 2 will suppress start-up popping noise. To

insure optimal suppression the time constant of the bias

filtering needs to be greater than the time constant of the

input capacitive coupling circuit, that is C2 x 25 k > C1 x R1.

ORDERING INFORMATION

Device

Package

NCS2211DG

SOIC-8

(Pb-Free)

98 Units / Rail

NCS2211DR2G

SOIC-8

(Pb-Free)

2500 / Tape & Reel

NCS2211MNTXG

DFN-8

(Pb-Free)

3000 / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.