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TEA2019 bảng dữ liệu(PDF) 4 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT
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RAMP
GENERATOR
IC
22nF
22nF
10
470
V6
6
V5
5
V3
31
42
7
8
9
10
11
12
13
14
TEA2019
0V
-1V
AS1
10nF
10nF
10k
8.2k
4.7
µF
4.7
µF
V12
V14
47nF
1.5nF
3.3nF
22nF
3.9k
56k
1%
59k
V10
100
TYPICAL CIRCUIT
GENERAL DESCRIPTION
(see application note AN406/0591)
Operating Principles (Figure 1)
On every period, the beginning of the conduction
time of the transistor is triggered by the fall of the
oscillator saw-tooth which acts as clock signal. The
period Tosc is given by :
Tosc
≈ 0.69 Ct (Rt + 2000)
(Tosc in seconds, Ct in Farad, Rt in
Ω)
The end of the conduction time is determined by a
signal issued from comparing the following signals.
a) the sawtooth waveform representing the
collector current of the switching transistor,
sampled across the emitter shunt resistor.
b) the output of the error amplifier.
Base Drive
• Fast turn-on
On each period, a current pulse ensures fast
transistor switch-on.
This pulse performs also the ton(min) function at
the beginning of the conduction.
• Proportional base drive
In order to save power, the positive base current
after the starting pulse becomes an image of the
collector current.
The ratio
IC
IB
is programmed as follows (Figure 2).
IC
IB
=
RB
RE
Figure 1 : Current Mode Control
C
I
SENSE
OSCILLATOR
ERROR
SIGNAL
ERROR
AMPLIFIER
COMPARATOR
S
R
Q
FLIP-FLOP
V
REF
I
C
V
i
OUTPUT
FILTER
Re
t
t
t
Error
Signal
OSCILLATOR
SAWTOOTH
I
(sample)
FLIP-FLOP
OUTPUT
C
TEA2019
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