MSK121B-1 查看數據表（PDF） - M.S. Kennedy

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MSK121B-1

DUAL HIGH POWER BRIDGE AMPLIFIER

M.S. Kennedy 

APPLICATION NOTES

POWER SUPPLY CONNECTIONS

The MSK 121 maximum supply voltage is specified as ±20V.

However, single sided or unbalanced power supply operation

is permisible as long as the total power supply voltage does

not exceed 40V. Caution should be exercised when routing

high current printed circuit paths. Generally, these paths

should not be placed near low level, high impedance input

circuitry to avoid oscillations.

During initial evaluation, power supply current limiting is

strongly advised to avoid damaging the device. The MSK

121 has an internal 0.1µF capacitor for high frequency

decoupling. However, both the negative and positive power

supplies must also be effectively decoupled with a low fre-

quency bypass capacitor to avoid power supply induced os-

cillation. An effective decoupling scheme consists of 10µF

of capacitance for every 1 Amp of output current from each

power supply pin to ground. The capacitors will eliminate

any peak output voltage clipping which may occur due to

poor power supply load regulation. Power supply decoupling

capacitors should be placed as close to the package power

supply pins as possible (pins 3 and 8).

CURRENT LIMIT

The current limit circuitry is internal to the device. The typi-

cal value is shown in the parameter table. For protection

against high energy flyback conditions (inductive loads), fast

recovery reverse biased diodes should be connected from each

output to the power supplies. (See Figure 1.)

SAFE OPERATING AREA

The safe operating area curve is a graphical representation

of the power handling capability of the amplifier under vari-

ous conditions. The wire bond current carrying capability,

transistor junction temperature and secondary breakdown limi-

tations are all incorporated into the safe operation area curves.

All applications should be checked against the S.O.A. curves

to ensure high M.T.B.F.

VREF PIN CONNECTIONS

The VREF pin is brought out to allow the user to bias the

outputs at a predetermined DC level. When the input signal

is AC coupled the output of each amplifier will be at the same

DC level as the VREF pin. This feature is very usefull when

using a single supply voltage. The user can simply connect a

resistor voltage divider to VREF to bias the output at one half

of the supply voltage by using 2 equal value resistors from

+VCC to -VCC (GND).

GAIN CONFIGURATIONS

The MSK 121 is available with preset gains of ±1, ±2, ±5

and ±10V/V. Refer to figure 1 for typical values of the inter-

nal components.

STABILITY CONSIDERATIONS

The MSK 121 has an internal RC snubber network on each

output for excellent stability for most applications. Good lay-

out practices should be used, however, when designing the

printed circuit board.

TYPICAL APPLICATION CIRCUIT

IN

P/N

MSK121-1

MSK121-2

MSK121-5

MSK121-10

AV

±1

±2

±5

±10

Rf

50KΩ

50KΩ

50KΩ

100KΩ

R

50KΩ

25KΩ

10KΩ

10KΩ

Figure 1

ZIN(VREF=GND)

33.3KΩ

18.8KΩ

8.6KΩ

9.2KΩ

3

Rev. C 7/00

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