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参数资料
| 型号： | TDA16847G |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A POWER FACTOR CONTROLLER, 98 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | PLASTIC, DSO-14 |
| 文件页数： | 2/28页 |
| 文件大小： | 586K |
| 代理商： | TDA16847G |
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TDA 16846
TDA 16846-2
Data Sheet
10
2003-07-31
Fold Back Point Correction PVC (Pin 11)
V
11 is derived from a voltage divider connected to 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 V11 at Pin 11 is
:
Off-Time Circuit OTC (Pin 1)
Figure 6 shows the Off-Time Circuit which determines the load dependent frequency
curve. When the driver switches off (Figure 7) the capacitor
C
1 is charged first by current
I
1L (approx. 0.5 mA, for extended ringing suppression time). As soon as the voltage at
pin 3 reaches the level
V
3L (2.5 V), the charging current is switched to the higher value
I
1H (approx. 1 mA, for normal ringing suppression time). This current flows 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 (rising time for
I
1H only)
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 C1 is discharged by
resistor
R
1. The voltage V1 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.
.
Control Voltage
Output Power
Off-time TD1
1.5 - 2 V
Low
Constant (TD1
MAX.), const. frequency stand by
2 - 3.5 V
Medium
Decreasing
3.5 - 5 V
High
Free running, switch-on at first minimum
IMprimary
4V
V
11
3
–
() R
2
C
2
×
Lprimary
------------------------------------------------------------
=
TC1
C1 1,5 V
×
1mA
-------------------------
≈
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