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參數(shù)資料
| 型號： | TEA1750T/N1,518 |
| 廠商： | NXP Semiconductors |
| 文件頁數(shù)： | 15/29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
15 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
The driver output is latched in the logic, preventing multiple switch-on.
7.3.4 Demagnetization (FBAUX pin)
The system is always in quasi-resonant or discontinuous conduction mode. The internal
oscillator does not start a new primary stroke until the previous secondary stroke has
ended.
Demagnetization features a cycle-by-cycle output short-circuit protection by immediately
lowering the frequency (longer off-time), thereby reducing the power level.
Demagnetization recognition is suppressed during the rst t
sup(xfmr_ring)
time (2 祍 typ).
This suppression may be necessary at low output voltages and at start-up and in
applications where the transformer has a large leakage inductance.
If pin FBAUX is open-circuit or not connected, a fault condition is assumed and the
converter stops operating immediately. Operation restarts as soon as the fault condition is
removed.
7.3.5 Flyback control / time-out (FBCTRL pin)
The pin FBCTRL is connected to an internal voltage source of 3.5 V via an internal
resistor (typical resistance is 3 k&). As soon as the voltage on this pin is above 2.5 V (typ),
this connection is disabled. Above 2.5 V the pin is biased with a small current. When the
voltage on this pin rises above 4.5 V (typ), a fault is assumed and switching is inhibited.
When a small capacitor is connected to this pin, a time-out function can be created to
protect against an open control loop situation (see
Figure
11 and
Figure
12). The time-out
function can be disabled by connecting a resistor (100 k&) to ground on the FBCTRL pin.
If the pin is shorted to ground, switching of the yback controller is inhibited.
In normal operating conditions, when the converter is regulating the output voltage, the
voltage on the FBCTRL pin is between 1.4 V and 2.0 V (typical values) from minimum to
maximum output power.
Fig 10. Frequency control of yback part
V
sense(fb)max
V
FBCTRL
1.5 V
2.0 V
0.52 V
flyback
frequency
reduction
PFC burst mode
FBSENSE peak voltage
014aaa028
PFC on
flyback
discontinuous
or QR
flyback
cycle skip
mode
1.4 V
0.13 V
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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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