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參數(shù)資料
| 型號： | TEA1654T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | GreenChipII SMPS control IC |
| 中文描述： | SWITCHING CONTROLLER, 75 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | 3.90 MM, PLASTIC, SO-14 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 119K |
| 代理商： | TEA1654T |
2003 May 12
6
Philips Semiconductors
Product specification
GreenChip
II SMPS control IC
TEA1654
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 24 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 24 kHz or above, the
cycle skipping mode will not be activated.
handbook, halfpage
VCO
fixed
quasi resonant
P (W)
MDB217
f
24
65
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)
MCE407
(kHz)
24
65
VCO2
level
VCO1
level
Fig.6 VCO frequency as a function of V
sense(max)
.
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| 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
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| TEA1657T/N1,518 | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 IC CTLR RESONANT CONV 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 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
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