參數(shù)資料
型號(hào)： KH561
廠商： Fairchild Semiconductor Corporation
英文描述： Wideband, Low Distortion Driver Amplifier
中文描述： 寬帶，低失真驅(qū)動(dòng)放大器
文件頁(yè)數(shù)： 12/13頁(yè)
文件大小： 182K
代理商： KH561
DATA SHEET
KH561
12
REV. 1A February 2001
Figure 10:Thermal Model
Note that the P
t
and P
q
equations are written for positive
V
o
. Absolute values of -V
CC
, V
o
, and I
o
, should be used
for a negative going V
o
. since we are only interested in
delta V
’
s. For bipolar swings, the two powers for each
output polarity are developed as shown above then
ratioed by the duty cycle. Having the total internal power,
as well as its component parts, the maximum junction
temperature may be computed as follows.
T
c
= T
A
+ (P
q
+ P
T
+ P
circult
)
θ
ca
Case Temperature
θ
ca
= 35
°
C/W for the KH561 with no heatsink in still air
T
j(t)
=T
c
+ P
t
20
°
C/W
output transistor junction temperature
T
j(q)
= T
c
+ P
q
200
°
C/W
hottest internal junction temperature
The Limiting Factor for Output Power is Maximum
Junction Temperature
Reducing
θ
ca
through either heatsinking and/or
airflow can greatly reduce the junction temperatures.
One effective means of heatsinking the KH561 is to use
a thermally conductive pad under the part from the pack-
age bottom to a top surface ground plane on the compo-
nent side. Tests have shown a
θ
ca
of 24
°
C in still air using
a
“
Sil Pad
”
available from Bergquist (800-347-4572).
As an example of calculating the maximum internal junc-
tion temperatures, consider the circuit of Figure 1 driving
±2.5V, 50% duty cycle, square wave into a 50
load.
Note that 1/2 of the total P
T
and P
a
powers were used
410
5
5 1
here since the 50% duty cycle output splits the power
evenly between the two halves of the circuit whereas the
total powers were used to get case temperature.
Even with the output current internally limited to 250mA,
the KH561
’
s short circuiting capability is principally a
thermal issue. Generally, the KH561 can survive short
duration shorts to ground without any special effort. For
protection against shorts to the ±15 volt supply voltages,
it is very useful to reduce some of the voltage across the
output stage transistors by using some external output
resistance, R
x
, as shown in Figure 9.
Evaluation Board
An evaluation board (part number 730019) for the KH561
is available.
R
50
45.6
I
2.5V / 45.6
54.9mA
I
54.9mA
54.9mA
.06
68.1mA
P
68.1mA 15
totalpower inbothsides of the output stage
2.5
0.7 15.3
68.1mA
733mW
P
2 68.1mA 15 1.4 17.3
totalpower inbothsides of hottest
prior to output stage
68.1mA
junctions
169mW
eq
o
T
12
2
2
T
q
=
=
)
=
=
+
(
)
+
(
)
=
]
=
=
]
=
0.
P
1.3 15
733mW 169mW
power in theremainder of circuit
2 68.1mA
54.9mA 19.2mA
1.058W
With thesepowers and T
25 C and
35 C / W
T
25 C
case temperature
.733 .169 1.058 35
(
94 C
From this,thehottestinternal junctionsmay be foundas
T t
94 C
.733 20
(
101
circuit
A
ca
c
12
=
)
[
]
=
=
=
=
=
( )
=
=
°
C output stage
θ
T q
=
94 C
hottestinternal junction
.169 200
(
111 C
12
=
Ambient
Temperature
θ
ca
200
°
C/W
20
°
C/W
T
j(t)
T
A
P
t
T
j(q)
P
q
P
circuit
Case Temperature
T
c
Case to Ambient
Termal Impedance
I
V /R
totaloutput current
withR
R
R A
A
L
1
totalload
I
I
I
.06
totalinternaloutput stage current
P
I
V
1.4 17.3
I
output stagepower
P
.2 I
0
V
V
0.7 15.3
I
power inhottestinternal junction
prior
to output stage
o
eq
eq
L
L
t
12
o
o2
2
t
t
CC
t
q
t
CC
o
t
=
=
=
+
+
(
)
=
(
)
=
(
)
P
1.3 V
2 I
I
19.2mA
P
P
=
power inremainder of circuit [note V
|]
circuit
CC
o
t
q
CC
CC
=
+
(
)
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