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參數(shù)資料
| 型號(hào)： | TDA16833 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Off-line SMPS Controller with 600 V Sense CoolMOS on Board |
| 中文描述： | 離線式開關(guān)電源控制器與600伏的董事會(huì)意識(shí)的CoolMOS |
| 文件頁數(shù)： | 6/21頁 |
| 文件大小： | 273K |
| 代理商： | TDA16833 |
TDA 16831-4
Data Sheet
6
1999-12-10
Circuit Description
The TDA 16831-4 is a current mode pulse
width modulator with integrated sense
CoolMOS
transistor.
requirements of minimum external control
circuitry for a flyback application.
Current mode control means that the
current through the MOS transistor is
compared with a reference signal derived
from the output voltage of the flyback
application. The result of that comparison
determines the on time of the MOS
transistor.
To minimize external circuitry the sense
resistor which gives information about
MOS current is integrated. The oscillator
resistor and capacitor which determine the
switching frequency are integrated, too.
Special efforts have been made to
compensate temperature dependency and
to minimize tolerances of this resistor.
The circuit in detail: (see
Figure 3
)
It
fulfills
the
Start Up Circuit (uvlo)
Uvlo is monitoring the external supply
voltage
V
CC
. When
V
CC
is exceeding the on
threshold
V
CCH
= 12 V, the bandgap, the
bias circuit and the soft start circuit are
switched on. When
V
CC
is falling below the
off-threshold
V
CCL
= 9 V the circuit is
switched off. During start up the current
consumption is about 30
μ
A.
Bandgap (bg)
The bandgap generates an internal very
accurate reference voltage of 5.5 V to
supply the internal circuits.
Current Source (bias)
The bias circuit provides the internal
circuits with constant current.
Oscillator (osc)
The oscillator is generating a frequency
twice
the
switching
f
switch
= 100 kHz. Resistor, capacitor and
current source which determine the
frequency are integrated. The charging
and
discharging
implemented
oscillator
internally trimmed, in order to achieve a
very
accurate
switching
Temperature coefficient of switching
frequency is very low ( see page 19).
frequency
current
of
the
is
capacitor
frequency.
Divider Flip Flop (tff)
Tff is a flip flop which divides the oscillator
frequency by one half to create the
switching frequency. The maximum duty
cycle is set to Dmax = 0.5.
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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA16833G | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Off-line SMPS Controller with 600 V Sense CoolMOS on Board |
| TDA16834 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Off-line SMPS Controller with 600 V Sense CoolMOS on Board |
| TDA16846 | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 CTRLR FOR SWITCH MODE PWR SUPPLIES RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| TDA16846_03 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Controller for Switch Mode Power Supplies Supporting Low Power Standby and Power Factor |
| TDA16846-2 | 功能描述:功率因數(shù)校正 IC CTRLR FOR SWITCH MODE PWR SUPPLIES RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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