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参数资料
| 型号： | L6732TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, HTSSOP-16 |
| 文件页数： | 5/37页 |
| 文件大小： | 898K |
| 代理商： | L6732TR |
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L6732
Device description
13/37
5.5
Error amplifier
5.6
Soft-start
When both VCC and VIN are above their turn-ON thresholds (VIN 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 CSS with an internal current
generator. The initial value for this current is 35 A and charges the capacitor up to 0.5 V.
After that it becomes 10 A until the final charge value of approximately 4 V (see Figure 6).
The output of the error amplifier is clamped with this voltage (VSS) until it reaches the
programmed value. No switching activity is observable if VSS is lower than 0.5 V and both
MOSFETs are OFF. When VSS is between 0.5 V and 1.1 V 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 VSS reaches 1.1 V (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 pre-bias 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 0.5 V and 1.1 V the low-side MOSFET is kept
OFF (see Figure 7 and Figure 8).
Figure 5.
Error amplifier reference
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相关代理商/技术参数 |
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| L6733 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller |
| L6733TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller |
| L6738 | 功能描述:电流型 PWM 控制器 Single-Phase SD Cont 5V to 12V bus 1.5V RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6738A | 功能描述:电流型 PWM 控制器 Single-phase PWM Light Load EFF RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L6738ATR | 功能描述:电流型 PWM 控制器 Single Phase PWM CNTRL Light-Load EFF RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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