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參數(shù)資料
| 型號： | L6731BTR |
| 廠商： | 意法半導體 |
| 英文描述： | Transistor; Type: Amplifiers/Bipolar; VCEO (V): -25; Ic (A): -1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: -0.5; Package: TO-92Mod |
| 中文描述： | 可調式降壓同步整流專用的DDR控制器內存 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 311K |
| 代理商： | L6731BTR |
L6731B
Device description
13/24
The output of the error amplifier is clamped with this voltage (Vss) 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 Vss 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 L6731B can always
sink or source current. If an over current is detected during the soft-start phase, the device
provides a constant-current-protection. In this way, in case of short soft-start time and/or small
inductor value and/or high output capacitors value and so, in case of high ripple current during
the soft-start, the converter can start in any case, limiting the current (see
5.8: Monitoring and
protections
) but not entering in HICCUP mode. During normal operation, if any under-voltage is
detected on one of the two supplies, the SS pin is internally shorted to GND and so the SS
capacitor is rapidly discharged.
5.7
Driver section
The high-side and low-side drivers allow using different types of power MOSFETs (also multiple
MOSFETs to reduce the R
DS(on)
), maintaining fast switching transitions. The low-side driver is
supplied by V
CCDR
while the high-side driver is supplied by the BOOT pin. A predictive dead
time control avoids MOSFETs cross-conduction maintaining very short dead time duration in
the range of 20ns. The control monitors the phase node in order to sense the low-side body
diode recirculation. If the phase node voltage is less than a certain threshold (-350mV typ.)
during the dead time, it will be reduced in the next PWM cycle. The predictive dead time control
doesn’t work when the high-side body diode is conducting because the phase node doesn’t go
negative. This situation happens when the converter is sinking current for example and, in this
case, an adaptive dead time control operates.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6731D | 功能描述:DC/DC 開關控制器 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 |
| L6731DTR | 功能描述:DC/DC 開關控制器 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 |
| L6732 | 功能描述:DC/DC 開關控制器 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 |
| L6732_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6732_0906 | 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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