, . 1, , .
1 - .
2.1.1 TDA7294 -
. :
U 12÷40(B)
ƒ 20 - 20 000 ()
U.. 35 ()
( ) 60 ()
( ) 100 ()
0 50000
2.1.2 700 (). =60*10-3 (), :
β = 
= 
=11.7
β = 
= 
;
γ = 
= 
= 4285.7
γ = 1+K0β 
β = 
= 
= 85,69*10-3
β = 
= β*R2+β*R3 = R3 R2 = 
2.2 .
, .
, . 2, :
1) Ueux.m = 10 ;
2) RH = 1200 ;
3) = 28 ;
4) ƒ = 75 ;
5)
=2,15.
, , .
:
1) ( );
2) ;
3) R1, R2;
4) R3;
5) R4;
6) 1, 2;
7) 3;
8) 1 Ku 
.
5% ( , ).
:
) :
1)
2)
UKmax>EK; (1.1)
3)
4)
Ik max > ok + Km, (1 2)
Iok -- ;
Ikm -- ;
Ikm = U.m/R≈, (1.3)
R≈ = 
─ . R3 .
, , :
R3 = R, (1.4)
R3 = 1200 ,
( , R3R, R3R), :
R≈ = 
=600 ;
|
|
|
IKm = 
= 16,7 .
OK = (1,05...1,1) IKm =1,1*16,7 = 18,4().
(1.1) (1.2) , :
UKmax > 30 ;
IK max> 18,4+16,7=35,1 A..
502. , 502, UKmax = 60 ,
IKmax= 300 , h21 = 40...120, Kmax = 500 .
) :
UOK = U..m +U (1.5)
U- , , .
, , U = 1 .
UOK= 10+1 = 11.
) , :
PK = IOK*UOK (1.6)
:
PK<PKmax;
PK = 18,4*11 = 202,4<500.
, .
) . (1.4),:
R3= 1200 .
, :
P = I2R. (1.7)
PR3.= I2okR3 = (18,4*10-3)2*1200 = 0,406 .
2-33 0,5 1200 .
) R4 :
R4 = 
- R3. (1.8)
:
= (0,10,4), (1.9)
R4, -n ( ). :
R4 = 
- 1200 = 267 ;
= 
= 0,2.
(1.9).
, R4:
PR4 = I2OKR4 = (18,4*10-3)2*267 = 0,09 .
2-33 0,5 280 .
) , R4 , ƒ 10 R4:
C3 
, (1.10)
106 .
C3 
= 75,7 .
:
UC3 = IokR4C = 18,4*10-3*280 = 5,15 .
50-35 100 6,3 .
) :
I = IOK/h21Emin (1.11)
I = 18,4 / 40 = 0,46 .
) 0,6 , -
U≈0,6 (1.12)
:
R = U/I, (1.13)
R = 
= 1304 .
) R1, R2. ij .
U = E = 28 . (1.14)
:
I = (2 5)I, (1.15)
, ..
= 5*0,46 = 2,3 .
R4 :
UR4 = ( + I)R4, (1.16)
UR4 = (18,4+0,46)*10-3*280 = 5,28 .
|
|
|
R1 = 
; (1.17)
R2 = 
. (1.18)
e
R1 = 
= 8449 ;
R2 = 
= 1252 .
R1=8,5 ; R2=l,3 .
, R1, R2:
PR1 = (I+I)2 R1; (1.19)
PR2 = I2R2; (1.20)
PR1 = [(0,46 + 2,3)*10-3]2*8,5*103 = 0,065 ;
R2 = (2,3*10-3)2*1,3*103= 0,007 .
2-33 0,125 .
) 2 ;
C2 
,
.
C2
UC2 = 1,5EK. (1.21)
C2 
=0,62,
UC2 = 1,5*28 = 42 .
73-17 0,68 250 .
) :
I.m = 
, (1.22)
h21Emin - .
I.m = 
= 0,42 .
U.m = I.mR. (1.23)
U.m = 0,42*10-3*1304 = 0,5477 .
P = 
, (1.24)
P = 
= 1,15*10-4 .
) , :
K1 = h21Emin 
= 40* 
= 20, (1.25)
KU = h21Emin 
= 40* 
= 1,84, (1.26)
Kp = K1KU = 20*1,84 = 36,8, (1.27)
ờ = 10 1g Kp = 10 1g 36,8 = 15,7 .
20 , .
, h21Emin = 40, . ij :
502 h21E = 40...120. 3 !
, , , . ', , .
) . 2.1
2,1 . .
