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參數(shù)資料
| 型號： | TK75001D |
| 廠商： | TOKO INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PWM CONTROLLER |
| 中文描述： | SWITCHING CONTROLLER, 66 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 102K |
| 代理商： | TK75001D |
January 1999 TOKO, Inc.
Page 9
TK75001
T
is the time required for the leakage inductance of the
flyback transformer to completely discharge its stored
energy into the voltage clamp. T
1
can be calculated as:
T
1
= (I
PK
x L
LEAK
) / V
OVERSHOOT
(7)
where I
is the peak current in the MOSFET at turn-off and
L
is the inductance of the flyback transformer measured
at winding n
1
.
T
2
is the conduction time of the output diode D
2
and T is the
switching period.
From Equation 4 the resistance R
AUX
or the voltage V
AUX
can be calculated.
Example: calculate the value of R
AUX
with the following
typical values:
V
OUT
= 12 V
L
LEAK
= 2
μ
H
I
AUX
= 18 mA
n
1
= 31
V
D2
= V
D3
= 1 V I
PK
= 1 A
V
OVERSHOOT
= 20 V
T
2
= 2
μ
s
n
2
= 6
n
3
= 7
V
AUX
= 13.5 V
T = 5
μ
s
Equations 5, 6 and 7 yield V
1
= 19.7 V, V
2
= 15.2 V, and
T
1
= 100 ns. Substituting those values into Equation 4 and
solving for R
AUX
yields:
R
AUX
= 20.6
Rounding the result to the nearest 5% standard value
gives R
AUX
= 20
.
DESIGN CONSIDERATIONS (CONT.)
FIGURE 1: TK75001 IN A FLYBACK POWER SUPPLY
(a) SCHEMATIC (b) VOLTAGE AT FEEDBACK PIN
FIGURE 2: SUBCIRCUIT FOR CALCULATING THE
VALUE OF R
AUX
GND
VCC
CT
FB
DRV
CAUX
R1
VAUX
RST
VIN
n3
n2
D3
RS
OC
TL431
+
+
VOUT
D2
FEEDBACK
VOLTAGE
SWITCH
CURRENT
SIGNAL
STABILIZING
RAMP
0.98 V
0
-
CT
GND
VCC
CT
FB
DRV
CAUX
RAUX
IAUX
D3
n3
T2
T1
V1
V
T
_
+
VAUX
(b)
(a)
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