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參數(shù)資料
| 型號： | TEA1750T/N1,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 10/29頁 |
| 文件大?。?/td> | 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
10 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
7.2.6 Burst mode control
When the output power of the yback converter (see
Section
7.3) is low, the yback
converter switches over to frequency reduction mode. When frequency reduction mode is
entered by the yback controller, the power factor correction circuit switches to burst mode
control.
In burst mode control, switching of the power factor correction circuit is inhibited until the
voltage on the VOSENSE pin has dropped to V
burst(L)
. Switching then restarts with a
soft-start to avoid audible noise (see
Section
7.2.5). As soon as the voltage on the
VOSENSE pin reaches V
burst(H)
the soft-stop circuit is activated, again to avoid audible
noise. During the soft-stop time the output voltage of the power factor correction circuit
overshoots, depending on the soft-start resistor and capacitor, R
SS1
and C
SS1,
on the
PFCSENSE pin. As the V
burst(H)
voltage is well below the V
reg(VOSENSE)
voltage, the PFC
output voltage does not reach the normal operation output voltage of the power factor
correction circuit in a typical application due to this overshoot.
The burst mode repetition rate is dened by the output power and the value of the bus
capacitor, C
bus
.
During burst mode operation the PFCCOMP pin is clamped between a voltage of
2.7 V (typ) and 3.9 V (typ). The lower clamp voltage limits the maximum power that is
delivered during burst mode operation and yields a more sinusoidal input current during
the burst pulse. The upper clamp voltage ensures that the PFC can return to its normal
regulation point in a limited amount of time when returning from burst mode.
As soon as the yback converter leaves frequency reduction mode, the power factor
correction circuit restores normal operation. To prevent continuous on and off switching of
the PFC circuit, a small hysteresis is built in (50 mV (typ) on the FBCTRL pin).
Fig 5. Soft start-up and soft stop of PFC
SOFT START
SOFT STOP
CONTROL
OCP
+
11
PFCSENSE
0.5 V
I
start(soft)PFC d 60 礎
S1
R
SS1
C
SS1
R
SENSE1
014aaa018
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相關代理商/技術參數(shù) |
參數(shù)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(shù)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(shù)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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