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參數(shù)資料
| 型號(hào)： | TEA1533P |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | GreenChip SMPS control IC |
| 中文描述： | 2 A SWITCHING CONTROLLER, 205 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大小： | 117K |
| 代理商： | TEA1533P |
2002 Aug 23
8
Philips Semiconductors
Product specification
GreenChip
TM
II SMPS control IC
TEA1533P; TEA1533AP
OverVoltage Protection (OVP)
An OVP mode is implemented in the GreenChip series.
This works for the TEA1533 by sensing the auxiliary
voltage via the current flowing into pin DEM during the
secondary stroke. The auxiliary winding voltage is a
well-defined replica of the output voltage. Any voltage
spikes are averaged by an internal filter.
If the output voltage exceeds the OVP trip level, an internal
counter starts counting subsequent OVP events. The
counter has been added to prevent incorrect OVP
detections which might occur during ESD or lightning
events. If the output voltage exceeds the OVP trip level a
few times and not again in a subsequent cycle, the internal
counter will count down with twice the speed compared
with counting-up. However, when typical 10 cycles of
subsequent OVP events are detected, the IC assumes a
true OVP and the OVP circuit switches the power
MOSFET off. Next, the controller waits until the UVLO
level is reached on pin V
CC
. When V
CC
drops to UVLO,
capacitor C
VCC
will be recharged to the V
start
level.
Regarding the TEA1533P, this IC will not start switching
again. Subsequently, V
CC
will drop again to the UVLO
level, etc. Operation only recommences when the V
CC
voltage drops below a level of approximately 4.5 V
(practically when V
mains
has been disconnected for a short
period).
Regarding the TEA1533AP, switching starts again (safe
restart mode) when the V
start
level is reached. This
process is repeated as long as the OVP condition exists.
The output voltage V
o(OVP)
at which the OVP function trips,
can be set by the demagnetization resistor, R
DEM
:
where N
s
is the number of secondary turns and N
aux
is the
number of auxiliary turns of the transformer.
Current I
(OVP)(DEM)
is internally trimmed.
The value of R
DEM
can be adjusted to the turns ratio of the
transformer, thus making an accurate OVP possible.
Valley switching
A new cycle starts when the power MOSFET is switched
on (see Fig.8). After the ‘on-time’ (which is determined by
the ‘sense’ voltage and the internal control voltage), the
switch is opened and the secondary stroke starts. After the
secondary stroke, the drain voltage shows an oscillation
with a frequency of approximately
where L
p
is the primary self inductance of the transformer
and C
d
is the capacitance on the drain node.
As soon as the oscillator voltage is high again and the
secondary stroke has ended, the circuit waits for the
lowest drain voltage before starting a new primary stroke.
This method is called valley detection. Figure 8 shows the
drain voltage together with the valley signal, the signal
indicating the secondary stroke and the oscillator signal.
In an optimum design, the reflected secondary voltage on
the primary side will force the drain voltage to zero. Thus,
zero voltage switching is very possible, preventing large
capacitive switching losses
and
allowing high frequency operation, which results in small
and cost effective inductors.
V
o OVP
N
N
aux
)
----------- I
(OVP)(DEM)
R
DEM
×
V
clamp(DEM)(pos)
+
}
=
(
2
π
×
L
p
C
d
×
)
×
---------------------1
P
1
2
C
V
2
×
f
×
×
=
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PDF描述 |
|---|---|
| TEA1533T | GreenChipTMII SMPS control IC |
| TEA1541 | SMPS control IC with synchronization function |
| TEA1541P | SMPS control IC with synchronization function |
| TEA1552 | GreenChipII SMPS control IC |
| TEA5594 | AM/FM radio receiver circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1533P/N1,112 | 功能描述:電壓模式 PWM 控制器 SMPS LOW STANDBY GREENCHIP RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| TEA1533T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChipTMII SMPS control IC |
| TEA1533T/N1,118 | 功能描述:電壓模式 PWM 控制器 GREENCHIP II SMPS CONTROL IC RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| TEA1533T/N1,518 | 功能描述:電壓模式 PWM 控制器 SMPS LOW STANDBY RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| TEA1533TD-T | 功能描述:電壓模式 PWM 控制器 SMPS LOW STANDBY GREENCHIP RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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