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參數資料
| 型號： | TEA1750T/N1,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數： | 17/29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
17 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
7.3.7 Maximum on-time
The yback controller limits the on-time of the external MOSFET to 25 祍 (typ). When the
on-time is longer than 25 祍, the IC stops switching and enters the safe restart mode.
7.3.8 Overvoltage protection (FBAUX pin)
An output overvoltage protection is implemented in the GreenChip III series. This works
for the TEA1750 by sensing the auxiliary voltage via the current owing into pin FBAUX
during the secondary stroke. The auxiliary winding voltage is a well-dened replica of the
output voltage. Voltage spikes are averaged by an internal lter.
If the output voltage exceeds the OVP trip level, an internal counter starts counting
subsequent OVP events. The counter has been added to prevent incorrect OVP detection
which might occur during ElectroStatic Discharge (ESD) or lightning events. If the output
voltage exceeds the OVP trip level a few times and not again in a subsequent cycle, the
internal counter counts down at twice the speed it uses when counting up. However, when
typically 8 cycles of subsequent OVP events are detected, the IC assumes a true OVP
and the OVP circuit switches the power MOSFET off. As the protection is latched, the
converter only restarts after the internal latch is reset. In a typical application the mains
should be interrupted to reset the internal latch.
The output voltage V
ovp(FBAUX)
at which the OVP function trips, can be set by the
demagnetization resistor, R
FBAUX
:
where N
s
is the number of secondary turns and N
aux
is the number of auxiliary turns of the
transformer. Current I
ovp(FBAUX)
is internally trimmed.
The value of R
FBAUX
can be adjusted to the turns ratio of the transformer, thus making an
accurate OVP detection possible.
Fig 12. Soft start-up of yback
014aaa020
SOFT START
CONTROL
OCP
+
10
FBSENSE
0.5 V
I
start(soft)fb d 60 礎
S2
R
SS2
C
SS2
R
SENSE2
V
o ovp
(
)
N
s
N
aux
----------- - I
ovp FBAUX
(
)
R
FBAUX
?/DIV>
V
clamp FBAUX
(
)
+
(
)
=
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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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