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參數(shù)資料
| 型號： | TEA1506AP/N1,112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | 0.300 INCH, MO-001, SC-504-8, SOT-97-1, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 22/22頁 |
| 文件大?。?/td> | 122K |
| 代理商： | TEA1506AP/N1,112 |
2003 Sep 09
9
Philips Semiconductors
Product specication
GreenChip
II SMPS control IC
TEA1506P; TEA1506AP;
TEA1506T; TEA1506AT
Valley switching
A new cycle starts when the power MOSFET is switched
on (see Fig.9). 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 Lp is the primary self inductance of the transformer
and Cd 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 9 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.
1
2
π
×
L
p
C
d
×
()
×
-----------------------------------------------
P
1
2
---
CV
2
×
f
×
=
handbook, full pagewidth
drain
secondary
stroke
MGU235
secondary
ringing
primary
stroke
valley
BA
secondary
stroke
oscillator
A: Start of new cycle at lowest drain voltage.
B: Start of new cycle in a classical PWM system at high drain voltage.
Fig.9 Signals for valley switching.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1506AT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip SMPS control IC |
| TEA1506AT/N1,118 | 功能描述:DC/DC 開關控制器 IC SMPS CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TEA1506AT/N1,518 | 功能描述:DC/DC 開關控制器 TEA1506AT/SO14/REEL13DP//N1 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TEA1506P | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip SMPS control IC |
| TEA1506P/N1,112 | 功能描述:DC/DC 開關控制器 GREENCHIP 2 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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