TK75005 Ver la hoja de datos (PDF) - Toko America Inc
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TK75005 Datasheet PDF : 9 Pages
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TK75005
APPLICATIONS INFORMATION (CONT.)
Select for R7:
R7 = 4.3 kohms
Resistance of current-sense resistor R8 (Note 2):
R8 = (VCCD - ISC(PK) x R7 x D) / IL1(PK) = 0.201 ohms
Select for R8:
R8 = 0.18 ohms
Note 1: This value of R7 ensures that the line current will be zero around
the zero-crossing of the line voltage, which is the required condition for
low-distortion line current.
Note 2: This value of R8 ensures that the sum of the voltage drop across
R8 (caused
(caused by
by the peak inductor current) and the voltage drop across R
the instantaneous value of the stabilizing current) is equal to7
the threshold voltage of the current-control detector at the peak of the
line voltage.
F1
250 V/ 2 A
85-265
VAC
C1
0.1 F
TH1
10 Ω
B1
4 600 V, 1.5 A
2
1
R1a
24 k
3
0.5 W
R1b
24 k
0.5 W
R2
5.6 k
C10
1 nF
400 V
D4
30 V
R4
C2
470 F
150 k
R3
5.6 k
L1
D1
1N4148
t:9
2.5 mH
t: 220
ETD-29 core
gap in center leg
C3
100 nF
C7
C4
100 nF
1F
R10
R9
D2
3k
IN4148
100 k
EAOUT
EAIN
VCC
FB
GND
OVP
R5
DRV
10
CT
U1
TK75005
C5
680 pF
D3
HFA04TB60
R11a
200 k
0.25 W
R11b
200 k
0.25 W
R51a
200 k
0.25 W
C8
100 F
400 V
Q1
IRF840
R6
51
C6
10 nF
R8
0.18
0.5 W
R12
2.43 k
380 V DC
100 W
R51b
200 k
0.25 W
R52
2.43 k
R7
4.3 k
Page 8
FIGURE 7: BOOST POWER FACTOR CORRECTOR APPLICATION CIRCUIT
January 1999 TOKO, Inc.
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