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參數(shù)資料
| 型號： | TDA16832G |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.7 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | PLASTIC, DSO-14 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 614K |
| 代理商： | TDA16832G |
TDA 16831-4
Circuit Description
Version 2.0
10
8 Aug 2002
Current Sense Amplifier (pwmop)
The positive input of the pwmop is applied to the internal sense resistor. With the internal
sense resistor (
R
sense) the sensed current coming from the CoolMOS is converted into a
sense voltage. The sense voltage is amplified with a gain of 32 dB. The amplified sense
voltage is connected to the negative input of the pwm comparator. Each time when the
CoolMOS transistor is switched on, a current spike is superposed to the true current
information. To eliminate this current spike the sense voltage is smoothed via an internal
resistor capacitor network with a time constant of
T
d1 = 100 ns. This is the first leading
edge blanking and only a small spike is left. To reduce this small spike the current sense
amplifier is creating a virtual ramp at the output. This is done by a second resistor
capacitor network with
T
d2 = 100 ns and an op-offset of 0.8 V which is seen at the output
of the amplifier. When gate drive is switched off the output capacitor is discharged via
pulse signal pwmpls. The oscillator signal slogpwm sets the RS-flip-flop. The gate drive
circuit is switched on, when capacitor voltage exceeds the internal threshold of 0.4 V.
This leads to a linear ramp, which is created by the output of the amplifier. Therefore duty
cycle of 0% is possible. The amplifier is compensated through an internal compensation
network.
The transfer function of the amplifier can be described as
the step response is described with
Comparator (pwmcomp)
The comparator pwmcomp compares the amplified current signal pwmrmp of the
CoolMOS with the reference signal pwmin. Pwmin is created by an external optocoupler
or external transistor and gives the information of the feedback circuitry. When the
pwmrmp exceeds the reference signal pwmin the comparator switches the CoolMOS off.
V
o
V
i
------
K
i
p
1
Tp
×
+
()
×
------------------------------------ p
;
j
ω
==
V
o
V
i
K
i
×
=
t
on
T
–
Te
-t
on
T
--------
×
+
×
K
i
40
t
on
------
=
T
850 ns
=
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