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參數(shù)資料
| 型號： | L6732 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Adjustable step-down controller with synchronous rectification |
| 中文描述： | 可調(diào)式降壓同步整流控制器 |
| 文件頁數(shù)： | 13/33頁 |
| 文件大?。?/td> | 735K |
| 代理商： | L6732 |
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L6732
Device description
13/33
5.5
Error amplifier
5.6
Soft start
When both V
CC
and V
IN
are above their turn-ON thresholds (V
IN
is monitored by the OCH pin)
the start-up phase takes place. Otherwise the SS pin is internally shorted to GND. At start-up, a
ramp is generated charging the external capacitor C
SS
with an internal current generator. The
initial value for this current is 35μA and charges the capacitor up to 0.5V. After that it becomes
10μA until the final charge value of approximately 4V (see
Figure 6.
). The output of the error
amplifier is clamped with this voltage (V
SS
) until it reaches the programmed value. No switching
activity is observable if V
SS
is lower than 0.5V and both MOSFETs are OFF. When V
SS
is
between 0.5V and 1.1V the low-side MOSFET is turned on because the comp signal is lower
than the valley of the triangular wave and so the duty-cycle is 0%. As V
SS
reaches 1.1V (i.e. the
oscillator triangular wave inferior limit) even the high-side MOSFET begins to switch and the
output voltage starts to increase. The L6732 can only source current during the soft-start phase
in order to manage the prebias start-up applications. This means that when the start-up occurs
with output voltage greater than 0V (pre-bias startup), even when Vss is between 0.5V and
1.1V the low-side MOSFET is kept OFF (see
Figure 7.
and
Figure 8.
).
Figure 5.
Error Amplifier Reference
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6732_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
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| L6732C | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| L6732CTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Step-Dwn Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6732TR | 功能描述:DC/DC 開關(guān)控制器 VOLTAGE REGULATOR RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
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