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參數(shù)資料
| 型號： | TDA8385 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Control circuit for a Self-Oscillating Power Supply SOPS |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 5/21頁 |
| 文件大?。?/td> | 199K |
| 代理商： | TDA8385 |
March 1994
6
Philips Semiconductors
Preliminary specification
Control circuit for a Self-Oscillating
Power Supply (SOPS)
TDA8385
Fig.4 Latch initialization as a function of supply voltage V
P
.
5.2
7.5
20
latch
initialization
operation
VP(V)
MCD403
Sawtooth generator (Block II)
C
URRENT SIMULATION
(
SEE FIGS
5
AND
16)
The current of the power supply
switching transistor is detected on the
secondary side by an indirect method
of current sensing.
Information of the collector current (I
c
)
is obtained by integrating the voltage
of an auxiliary winding of the
transformer during transistor on-time
(T
on
). An external capacitor C on pin 5
is charged during T
on
by the current
source I
sim
. The current I
sim
is the
reflection of the current which flows
into pin 12. This current is obtained by
connecting an external resistor R12 to
the auxiliary transformer winding.
During transistor on-time this current
is related to the input voltage V
I
.
During transistor off time (T
off
) the
capacitor C is discharged by switch
sw1. This switch is active during the
total T
off
time. In this way a sawtooth
voltage V
c
is formed across C. This
sawtooth is a measure for the
collector current of the switching
transistor T1.
For the voltage V
c
yields:
(1)
(2)
Where: p = reflection factor;
I
12
(2)
→
(1) gives:
(3)
V
c
I
---------C
T
×
=
I
sim
p
n
h
n
p
-----
×
V
I
R12
×
=
p
I
0.2
=
=
V
c
p
C
---
n
h
n
p
-----
×
V
I
R12
×
T
on
×
=
Fig.5 Determination of the peak current I
c
.
VI
C
R12
I12
12
5
Isim
L
T1
np
Ic
nh
Vc
t
MCD404
Vc
Ton
Toff
sw1
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