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參數資料
| 型號： | TEA1750T/N1,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數： | 13/29頁 |
| 文件大小： | 163K |
| 描述： | IC PFC CONTROLLER DCM16SOIC |
| 標準包裝： | 2,500 |
| 系列： | GreenChip™ III |
| 模式： | 間歇導電（DCM） |
| 頻率 - 開關： | 100kHz ~ 150kHz |
| 電流 - 啟動： | 60µA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SO |
| 包裝： | 帶卷 (TR) |
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TEA1750_2
?NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 15 December 2008
13 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
In frequency reduction mode the PFC controller is switched to burst mode operation and
the yback maximum frequency changes linearly with the control voltage on the FBCTRL
pin (see
Figure
8 ). For stable on-off switching of the PFC burst mode, the FBCTRL pin
has a 50 mV (typ) hysteresis. At no load operation the switching frequency of the yback
can be reduced to (almost) zero.
7.3.2 Valley switching (HV pin)
Refer to
Figure
9. A new cycle starts when the external MOSFET is activated. After the
on-time (determined by the FBSENSE voltage and the FBCTRL voltage), the MOSFET is
switched off and the secondary stroke starts. After the secondary stroke, the drain voltage
shows an oscillation with a frequency of approximately
where L
p
is the primary self inductance of the yback transformer and C
d
is the
capacitance on the drain node.
As soon as the internal 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.
Figure
9 shows the drain voltage, valley signal, secondary stroke signal and the internal
oscillator signal.
Valley switching allows high frequency operation as capacitive switching losses are
reduced, see
Equation
1. High frequency operation makes small and cost-effective
magnetics possible.
(1)
Fig 8. Frequency control of yback part
f
sw(fb)max
V
FBCTRL
1.5 V
discontinuous
with valley
switching
quasi resonant
frequency
reduction
PFC burst mode
switching frequency
014aaa026
PFC on
1
2 ?/SPAN>
?/DIV>
L
p
C
d
?/DIV>
(
)
?/DIV>
(
)
--------------------------------------------------- -
P
1
2
-- - C
d
V
2
?/DIV>
f
?/DIV>
?/DIV>
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=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TEA1750T-T | 功能描述:DC/DC 開關控制器 GREENCHIPIII 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TEA1751AT/N1,518 | 功能描述:DC/DC 開關控制器 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TEA1751AT/N1518 | 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| TEA1751LT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip III SMPS control IC |
| TEA1751LT/N1 | 制造商:NXP Semiconductors 功能描述:AC-DC PFC FLYBACK CNTRL 16SOIC 制造商:NXP Semiconductors 功能描述:AC-DC, PFC, FLYBACK, CNTRL, 16SOIC 制造商:NXP Semiconductors 功能描述:GreenChip III SMPS Control 16-Pin SO |
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