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參數(shù)資料
| 型號： | MSK121 |
| 廠商： | M.S. Kennedy Corporation |
| 英文描述： | Dual High Power Bridge Amplifier(低成本雙橋放大器) |
| 中文描述： | 雙高功率橋放大器（低成本雙橋放大器） |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 300K |
| 代理商： | MSK121 |
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 0.1
μ
F 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 10
μ
F
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
IN
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
P/N
MSK121-1
MSK121-2
MSK121-5
MSK121-10
R
50K
25K
10K
10K
A
V
±1
±2
±5
±10
R
f
50K
50K
50K
100K
Figure 1
Z
IN
(V
REF
=GND)
33.3K
18.8K
8.6K
9.2K
Rev. C 7/00
3
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