參數(shù)資料
型號(hào)： TDA16846G
廠商： INFINEON TECHNOLOGIES AG
元件分類： 穩(wěn)壓器
英文描述： 0.1 A POWER FACTOR CONTROLLER, 98 kHz SWITCHING FREQ-MAX, PDSO14
封裝： PLASTIC, DSO-14
文件頁(yè)數(shù)： 28/28頁(yè)
文件大?。?/td> 586K
代理商： TDA16846G
TDA 16846
TDA 16846-2
Data Sheet
9
2003-07-31
Figure 5
Startup Voltage Diagram
Primary Current Simulation PCS (Pin 2) / Current Limiting
A voltage proportional to the current of the power transistor is generated at Pin 2 by the
RC-combination
R
2, C2 (Figure 4). The voltage at Pin 2 is forced to 1.5 V when the
power transistor is switched off and during its switch on time
C
2 is charged by R2 from
the rectified mains. The equation of
V
2 and the current in the power transistor (Iprimary) is
:
L
primary: Primary inductance of the transformer
The voltage
V
2 is applied to one input of the On Time Comparator ONTC (see Figure 2).
The other input is the control voltage. If
V
2 exceeds the control voltage, the driver
switches off (current limiting). The maximum value of the control voltage is the internal
reference voltage 5 V, so the maximum current in the power transistor (
I
Mprimary) is
:
The control voltage can be reduced by either the Error Amplifier EA (current mode
regulation), or by an opto coupler at Pin 5 (regulation with opto coupler isolation) or by
the voltage
V
11 at Pin 11 (Fold Back Point Correction).
V2
1,5 V
Lprimary Iprimary
×
R2 C2
×
--------------------------------
+
=
IMprimary
3,5 V
R
2
×
C
2
×
Lprimary
--------------------------------------
=
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