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TDA16846G 데이터시트(Datasheet) 9 Page - Infineon Technologies AG

부품명 TDA16846G
상세내용  ICs for Consumer Electronics
PDF  28 Pages
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제조사  INFINEON [Infineon Technologies AG]
홈페이지  http://www.infineon.com
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TDA 16846
TDA 16847
Data Sheet
9
2000-01-14
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 relation 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).
AED02650
t
Startup
Operation
14
V
Vmax
On
V
VOff
V
2
1,5 V
Lprimary Iprimary
×
R
2
C
2
×
--------------------------------
+
=
I
Mprimar y
3,5 V
R2
×
C2
×
Lprimary
--------------------------------------
=




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