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參數(shù)資料
| 型號(hào)： | TEA2260 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A SWITCHING CONTROLLER, 100 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | BATWING, PLASTIC, DIP-16 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 127K |
| 代理商： | TEA2260 |
Obsolete
Product(s)
- Obsolete
Product(s)
TEA2261/0
7/11
The magnetization state of the transformer is
checked by sensing the voltage across a winding
of the transformer (generally the same which sup-
plies the TEA2261). This is made by connecting a
resistor between this winding and the demagneti-
zation sensing input of the circuit (Pin 1).
SECURITY FUNCTIONS OF THE TEA2260 (see flowchart below)
Undervoltage Detection. This protection works in
association with the starting device “VCC switch”
(see paragraph Starting-mode - stand-by mode). If
VCC is lower than VCCstop (typically 7.4V) output
pulses are inhibited, in order to avoid wrong oper-
ation of the power supply or bad power transistor
drive.
Overvoltage Detection. If VCC exceeds VCCmax
(typically 15.7V) output pulses are inhibited. Re-
starting of the power supply is obtained by reduc-
ing VCC below VCCstop.
Current Limitation of the Power Transistor. The
current is measured by a shunt resistor. A double
threshold system is used:
– When the first threshold (VIM1) is reached, the
conduction of the power transistor is stopped un-
til the end of the period: a new conduction signal
is needed to obtain conduction again.
– Furthermore as long as the first threshold is
reached (it means during several periods), an ex-
ternal capacitor C2 is charged. When the voltage
across the capacitor reaches VC2 (typically
2.55V) the output is inhibited. This is called the
“repetitive overload protection”. If the overload
disappears before VC2 is reached, C2 is dis-
charged, so transient overloads are tolerated.
– Second current limitation threshold (VIM2). When
this threshold is reached the output of the circuit
is immediately inhibited. This protection is helpful
in case of hard overload for example to avoid the
magnetization of the transformer.
Restart of the Power Supply. After stopping due
to VC2, VIM2, VCCMax or VCCstop triggering, re-
start of the power supply can be obtained by the
normal operating of the “VCC switch” but thanks to
an integrated counter, if normal restart cannot be
obtained after three trials, the circuit is definitively
stopped. In this case it is necessary to reduce VCC
below approximately 5V to reset the circuit. From a
practical point of view, it means that the power
supply has to be temporarily disconnected from
any power source to get the restart.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TEA2261 | 功能描述:視頻 IC SMPS Controller RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| TEA2261_03 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SWITCH MODE POWER SUPPLY CONTROLLER |
| TEA2262 | 功能描述:電流型 PWM 控制器 SMPS Controller RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TEA2R2M1CTR-0512P | 功能描述:鋁質(zhì)電解電容器 - 帶引線 16V 2.2uF 20% RoHS:否 制造商:Kemet 引線類型: 電容:220 uF 容差:20 % 電壓額定值:25 V 工作溫度范圍: 端接類型:Radial 外殼直徑:8 mm 外殼長(zhǎng)度:11 mm 引線間隔:5 mm 產(chǎn)品:General Purpose Electrolytic Capacitors 封裝:Bulk |
| TEA2R2M1HBK-0512P | 功能描述:鋁質(zhì)電解電容器 - 帶引線 50V 2.2uF 20% RoHS:否 制造商:Kemet 引線類型: 電容:220 uF 容差:20 % 電壓額定值:25 V 工作溫度范圍: 端接類型:Radial 外殼直徑:8 mm 外殼長(zhǎng)度:11 mm 引線間隔:5 mm 產(chǎn)品:General Purpose Electrolytic Capacitors 封裝:Bulk |
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