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參數資料
| 型號： | TEA1751T/N1,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數： | 5/29頁 |
| 文件大小： | 253K |
| 描述： | IC CTRLR GREENCHIP SMPS 16-SOIC |
| 標準包裝： | 2,500 |
| 系列： | GreenChip™ III |
| 模式： | 連續導電（CCM） |
| 頻率 - 開關： | 125kHz |
| 電流 - 啟動： | 60µA |
| 電源電壓： | 0.65 V ~ 22 V |
| 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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TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 23 December 2009
5 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
7. Functional description
7.1 General control
The TEA1751(L)T contains a controller for a power factor correction circuit as well as a
controller for a flyback circuit. A typical configuration is shown in Figure 3
.
7.1.1 Start-up and UnderVoltage LockOut (UVLO)
Initially the capacitor on the V
CC
pin is charged from the high voltage mains via the HV pin.
As long as V
CC
is below V
trip
, the charge current is low. This protects the IC if the V
CC
pin
is shorted to ground. For a short start-up time the charge current above V
trip
is increased
until V
CC
reaches V
th(UVLO)
. If V
CC
is between V
th(UVLO)
and V
startup
, the charge current is
low again, ensuring a low duty cycle during fault conditions.
The control logic activates the internal circuitry and switches off the HV charge current
when the voltage on pin V
CC
passes the V
startup
level. First, the LATCH pin current source
is activated and the soft start capacitors on the PFCSENSE and FBSENSE pins are
charged. When the LATCH pin voltage exceeds the V
en(LATCH)
voltage and the soft start
capacitor on the PFCSENSE pin is charged, the PFC circuit is activated. Also the flyback
converter is activated (providing the soft start capacitor on the FBSENSE pin is charged).
The output voltage of the flyback converter is then regulated to its nominal output voltage.
The IC supply is taken over by the auxiliary winding of the flyback converter. See Figure 4
.
If during start-up the LATCH pin does not reach the V
en(LATCH)
level before V
CC
reaches
V
th(UVLO)
, the LATCH pin output is deactivated and the charge current is switched on
again.
Fig 3. Typical configuration
12 11
9
16 13
8
6
7
3
2
10
4
1
TEA1751(L)T
014aaa301
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TEA1752LT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip III SMPS control IC |
| TEA1752LT/N1,518 | 功能描述:DC/DC 開關控制器 IC CTLR SMPS SW MODE 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 |
| TEA1752LT/N1/S1518 | 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| TEA1752T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:The TEA1752T and TEA1752LT combine a controller for Power Factor Correction (PFC) and a flyback controller. |
| TEA1752T/1791/DB/90W,598 | 制造商:NXP Semiconductors 功能描述:- Boxed Product (Development Kits) 制造商:NXP Semiconductors 功能描述:90W notebook adapter Ref |
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