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參數(shù)資料
| 型號(hào)： | TEA1552 |
| 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)： | 6/24頁 |
| 文件大?。?/td> | 119K |
| 代理商： | TEA1552 |
2002 Aug 27
6
Philips Semiconductors
Product specification
GreenChip
II SMPS control IC
TEA1552
Current mode control
Current mode control is used for its good line regulation
behaviour.
The ‘on-time’ is controlled by the internally inverted control
pin voltage, which is compared with the primary current
information. The primary current is sensed across an
external resistor. The driver output is latched in the logic,
preventing multiple switch-on.
The internal control voltage is inversely proportional to the
external control pin voltage, with an offset of 1.5 V. This
means that a voltage range from 1 to 1.5 V on pin CTRL
will result in an internal control voltage range from
0.5 to 0 V (a high external control voltage results in a low
duty cycle).
Oscillator
The maximum fixed frequency of the oscillator is set by an
internal current source and capacitor. The maximum
frequency is reduced once the control voltage enters the
VCO control window. Then, the maximum frequency
changes linearly with the control voltage until the minimum
frequency is reached (see Figs 5 and 6).
VCO adjustment
The VCOadj pin can be used to set the VCO operation
point. As soon as the peak voltage on the sense resistor is
controlled below half the voltage on the VCOadj pin (VCO
1
level), frequency reduction will start. The actual peak
voltageonsensewillbesomewhathigherduetoswitch-off
delay (see Fig.7). The frequency reduction will stop
approximately 25 mV lower (VCO
2
level), when the
minimum frequency is reached.
Cycle skipping
At very low power levels, a cycle skipping mode will be
activated. A high control voltage will reduce the switching
frequency to a minimum of 25 kHz. If the voltage on the
control pin has raised even more, switch-on of the external
power MOSFET will be inhibited until the voltage on the
control pin has dropped to a lower value again (see Fig.7).
For system accuracy, it is not the absolute voltage on the
control pin that will trigger the cycle skipping mode, but a
signal derived from the internal VCO will be used.
Remark: If the no-load requirement of the system is such
that the output voltage can be regulated to its intended
level at a switching frequency of 25 kHz or above, the
cycle skipping mode will not be activated.
handbook, halfpage
VCO
fixed
quasi resonant
P (W)
MBL500
f
25
125
Fig.4 Multi mode operation.
handbook, halfpage
VCTRL
1 V
(typ)
0.52 V
1.5 V
(typ)
MGU233
Fig.5 V
sense(max)
as a function of V
CTRL
.
handbook, halfpage
Vsense(max) (V)
MBL501
f
25
125
125 kHz
VCO2
level
VCO1
level
Fig.6 VCO frequency as a function of V
sense(max)
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1552T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChipII SMPS control IC |
| TEA1552T/N1 | 制造商:NXP Semiconductors 功能描述:AC-DC SMPS 14SOIC 制造商:NXP Semiconductors 功能描述:AC-DC, SMPS, 14SOIC |
| TEA1552T/N1,118 | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 GREENCHIP II SMPS CONTROL IC 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 |
| TEA1552T/N1,518 | 功能描述:DC/DC 開關(guān)控制器 GRNCHIP2 SMPS CNTRLR RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| TEA1553T | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip II SMPS control IC |
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