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| 型號： | TDA16847 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | ICs for Consumer Electronics |
| 中文描述： | 消費(fèi)電子集成電路 |
| 文件頁數(shù)： | 10/28頁 |
| 文件大?。?/td> | 351K |
| 代理商： | TDA16847 |
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TDA 16846
TDA 16847
Data Sheet
10
2000-01-14
Fold Back Point Correction PVC (Pin 11)
V
11
is deviated by a voltage divider from the rectified mains and reduces the limit of the
possible current maximum in the power transistor if the mains voltage increases. I.e. this
limit is independent of the mains (only active in free running mode). The maximum
current (
I
Mprimary
) depending on the voltage
V
11
at Pin 11 is
:
Off-Time Circuit OTC (Pin 1)
Figure 6
shows the Off-Time Circuit which determines the load dependent frequency
course. When the driver switches off (
Figure 7
) the capacitor
C
1
is charged by current
I
1
(approx. 1 mA) until the capacitor’s voltage reaches 3.5 V. The charge time TC1 is
:
For proper operation of the special internal anti jitter circuit, TC1 should have the same
value as the resonance time “TR” of the power circuit (
Figure 7
). After charging
C
1
up to
3.5 V the current source is disconnected and
C
1
is discharged by resistor
R
1
. The voltage
V
1
at Pin 1 is applied to the Off-Time Comparator (OFTC). The other input of OFTC is
the control voltage. The value of the control voltage at the input of OFTC is limited to a
minimum of 2 V (for stable frequency at very light load). The On-Time Flip Flop (ONTF)
is set, if the output of OFTC is high
1)
and the voltage
V
3
at Pin 3 falls below 25 mV (zero
crossing signal is high). This ensures switching on of the power transistor at minimum
voltage. If no zero crossing signal is coming into pin 3, the power transistor is switched
on after an additional delay until
V
1
falls below 1.5 V (see
Figure 6
, OFTCD). As long as
V
1
is higher than the limited control voltage, ONTF is disabled to suppress wrong zero
crossings of
V
3
, due to parasitic oscillations from the transformer after switch-off. The
discharge time of
C
1
is a function of the control voltage.
1)
i.e.
V
1
is less than the limited control voltage.
.
If the control voltage is below 2 V (at low output power) the “off-time” is maximum and
constant
Control Voltage
1.5 - 2 V
2 - 3.5 V
3.5 - 5 V
Output Power
Low
Medium
High
Off-time TD1
Constant (TD1
MAX.
), const. frequency stand by
Decreasing
Free running, switch-on at first minimum
I
Mprimary
4 V
V
3
–
(
------------------------------------------------------------
)
R
C
2
×
×
L
primary
=
TC1
C
-------------------------
1,5 V
1mA
≈
TD1
max
0,47
R
1
×
C
1
×
≈
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