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參數(shù)資料
| 型號： | TEA1507P |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | GreenChipII 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)： | 8/20頁 |
| 文件大?。?/td> | 114K |
| 代理商： | TEA1507P |
2000 Dec 05
8
Philips Semiconductors
Preliminary specification
GreenChip
II SMPS control IC
TEA1507
OverVoltage Protection (OVP)
An OVP mode is implemented in the GreenChip
series.
For the TEA1507, this works 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, the OVP
circuit switches the power MOSFET off. Next, the
controller waits until the UVLO level is reached on pin V
CC
.
This is followed by a safe restart cycle, after which
switching starts again. This process is repeated as long as
the OVP condition exists.
The output voltage at which the OVP function trips, V
o(OVP)
can be set by the demagnetization resistor, R
DEM
:
N
N
aux
Where N
s
is the number of secondary turns and N
aux
is the
number of auxiliary turns of the transformer.
Current I
ref
is internally trimmed.
The value of the demagnetization resistor (R
DEM
) can be
adjusted to the turns ratio of the transformer, thus making
an accurate OVP possible.
OverCurrent Protection (OCP)
The cycle-by-cycle peak drain current limit circuit uses the
external source resistor to measure the current accurately.
This allows optimum size determination of the transformer
core (cost issue). The circuit is activated after the leading
edge blanking time, t
leb
. The OCP protection circuit limits
the ‘sense’ voltage to an internal level.
OverPower Protection (OPP)
During the primary stroke, the rectified mains input voltage
is measured by sensing the current drawn from pin DEM.
This current is dependent on the mains voltage, according
to the following formula:
Where:
The current information is used to adjust the peak drain
current, which is measured via pin I
sense
. The internal
compensation is such that an almost mains independent
maximum output power can be realized.
The OPP curve is given in Fig.8.
Short winding protection
After the leading edge blanking time, the short winding
protection circuit is also activated. If the ‘sense’ voltage
exceeds the short winding protection voltage V
swp
, the
converter will stop switching. Once V
CC
drops below the
UVLO level, capacitor C
VCC
will be recharged and the
supply will restart again. This cycle will be repeated until
the short circuit is removed (safe restart mode).
The short winding protection will also protect in case of a
secondary diode short circuit.
Overtemperature protection
An accurate temperature protection is provided in the
circuit. When the junction temperature exceeds the
thermal shutdown temperature, the IC will stop switching.
When V
CC
drops to UVLO, capacitor C
VCC
will be
recharged to the V
start
level. If the temperature is still too
high, V
CC
will drop again to the UVLO level, etc. (safe
restart mode).
Operation recommences when the junction temperature
drops 8 degrees typically.
V
o OVP
)
-----------
I
(OVP)(DEM)
R
DEM
V
clamp DEM
)
pos
(
)
+
×
(
)
×
=
I
DEM
(
)
V
R
DEM
--------------
N
--------------------------
V
R
DEM
≈
≈
N
N
p
---N
=
handbook, halfpage
0.50 V
(typ)
0.3 V
(typ)
IDEM
Vsense(max)
24
μ
A
(typ)
100
μ
A
(typ)
Fig.8 OPP correction curve.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1507P/N1,112 | 功能描述:轉(zhuǎn)換 - 電壓電平 SMPS GREENCHIP II RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8 |
| TEA1520 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STARplug |
| TEA1520P | 制造商:STMicroelectronics 功能描述:NXP IC 8-PIN DIP |
| TEA1520P/N2,112 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 POWERPLUG RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TEA1520PN | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 POWERPLUG RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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