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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)： | 9/24頁 |
| 文件大?。?/td> | 119K |
| 代理商： | TEA1654 |
2003 May 12
9
Philips Semiconductors
Product specification
GreenChip
II SMPS control IC
TEA1654
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.
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.9.
Minimum and maximum ‘on-time’
The minimum ‘on-time’ of the SMPS is determined by the
Leading Edge Blanking (LEB) time. The IC limits the
‘on-time’ to 50
μ
s. When the system desires an ‘on-time’
longer than 50
μ
s, a fault condition is assumed, and the IC
will stop switching and enter the safe restart mode.
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.
P
1
2
C
V
2
f
×
×
×
=
I
DEM
V
DEM
R
N
-----R
V
DEM
×
≈
≈
N
N
p
-N
=
handbook, halfpage
0.52 V
(typ)
0.3 V
(typ)
IDEM
Vsense(max)
24
μ
A
(typ)
100
μ
A
(typ)
Fig.9 OPP correction curve.
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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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