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參數(shù)資料
| 型號： | L6732TR |
| 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 |
| 文件大小： | 735K |
| 代理商： | L6732TR |
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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 |
|---|---|
| L6733 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller |
| L6733TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller |
| L6738 | 功能描述:電流型 PWM 控制器 Single-Phase SD Cont 5V to 12V bus 1.5V RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L6738A | 功能描述:電流型 PWM 控制器 Single-phase PWM Light Load EFF RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L6738ATR | 功能描述:電流型 PWM 控制器 Single Phase PWM CNTRL Light-Load EFF RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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