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參數(shù)資料
| 型號： | TEA1654 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | GreenChipII SMPS control IC |
| 中文描述： | GreenChipII開關(guān)電源控制IC |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 119K |
| 代理商： | TEA1654 |
2003 May 12
7
Philips Semiconductors
Product specification
GreenChip
II SMPS control IC
TEA1654
handbook, full pagewidth
MDB219
1.5 V
VCTRL
fosc
fmax
fmin
Vx (mV)
CTRL
VCC(5V)
current
comparator
cycle
skipping
X2
V
I
1
0
Vx
OSCILLATOR
DRIVER
DRIVER
5 V
Vx (mV)
Vx (mV)
dV4
dV2
dV1
dV3
VSTDBY
(V)
5
0
VCOadj
VCOadj
Isense
Fig.7 A functional implementation of the standby and cycle skipping circuitry.
The voltage levels dV
, dV
, dV
and dV
are fixed in the IC to typically 50 mV, 18 mV, 40 mV and 15 mV respectively.
The level at which VCO mode of operation starts or ends can be controlled externally with the VCOadj pin.
Standby output
TheSTDBYoutputpin(V
STDBY
= 5 V)canbeusedtodrive
an external NPN transistor or FET in order to e.g.
switch-off a PFC circuit. The STDBY output is activated by
the internal VCO: as soon as the VCO has reduced the
switching frequency to (almost) the minimum frequency of
24 kHz, the STDBY output will be activated (see Fig.7).
The STDBY output will go low again as soon as the VCO
allows a switching frequency close to the maximum
frequency of 65 kHz.
Demagnetization
The system will be in discontinuous conduction mode all
the time. The oscillator will not start a new primary stroke
until the secondary stroke has ended.
Demagnetization features a cycle-by-cycle output
short-circuit protection by immediately lowering the
frequency (longer off-time), thereby reducing the power
level.
Demagnetization recognition is suppressed during the first
time (t
suppr
). This suppression may be necessary in
applications where the transformer has a large leakage
inductance and at low output voltages/start-up.
OverVoltage Protection (OVP)
An OVP mode is implemented in the GreenChip series.
For the TEA1654, 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 off the power MOSFET. The controller
then 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, however the IC will not start
switching again. Subsequently, V
CC
will drop again to the
UVLO level, etc.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1654T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChipII SMPS control IC |
| TEA1654T,118 | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 SW Mode Power Supply Controller 14-Pin RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TEA1654T/N1,518 | 功能描述:轉(zhuǎn)換 - 電壓電平 TEA1654T/SO14/REEL13DP//N1 RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時(shí)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 |
| TEA1655T/N1,518 | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 IC CTLR SMPS SW MODE RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TEA1656T/N1,118 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 TEA1656T/SO8/REEL13/ 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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