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参数资料
| 型号： | L6599ADTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO16 |
| 封装： | ROHS COMPLIANT, SOP-16 |
| 文件页数： | 21/36页 |
| 文件大小： | 1595K |
| 代理商： | L6599ADTR |
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Application information
L6599A
28/36
Doc ID 15308 Rev 5
voltage of the L6599A (Vcc) falls below the UVLO threshold the IC keeps memory of the
event and will not restart immediately after Vcc exceeds the start-up threshold if V(DELAY)
is still higher than 0.3 V. Also the PFC_STOP pin will stay low as long as V(DELAY) is
greater than 0.3 V. Note also that in case there is an overload lasting less than TSH, the
value of TSH for the next overload will be lower if they are close to one another.
7.5
Latched shutdown
The L6599A is equipped with a comparator having the non-inverting input externally
available at pin 8 (DIS) and with the inverting input internally referenced to 1.85V. As the
voltage on the pin exceeds the internal threshold, the IC is immediately shut down and its
consumption reduced at a low value. The information is latched and it is necessary to let the
voltage on the Vcc pin go below the UVLO threshold to reset the latch and restart the IC.
This function is useful to implement a latched overtemperature protection very easily by
biasing the pin with a divider from an external reference voltage (e.g. pin 4, RFmin), where
the upper resistor is an NTC physically located close to a heating element like the MOSFET,
or the secondary diode or the transformer.
An OVP can be implemented as well, e.g. by sensing the output voltage and transferring an
overvoltage condition via an optocoupler.
7.6
Line sensing function
This function basically stops the IC as the input voltage to the converter falls below the
specified range and lets it restart as the voltage goes back within the range. The sensed
voltage can be either the rectified and filtered mains voltage, in which case the function will
act as a brownout protection, or, in systems with a PFC pre-regulator front-end, the output
voltage of the PFC stage, in which case the function will serve as a power-on and power-off
sequencing.
L6599A shutdown upon input undervoltage is accomplished by means of an internal
comparator, as shown in the block diagram of Figure 30, whose non-inverting input is
available at pin 7 (LINE). The comparator is internally referenced to 1.24 V and disables the
IC if the voltage applied at the LINE pin is below the internal reference. Under these
conditions the soft-start is discharged, the PFC_STOP pin is open and the consumption of
the IC is reduced. PWM operation is re-enabled as the voltage on the pin is above the
reference. The comparator is provided with current hysteresis instead of a more usual
voltage hysteresis: an internal 13 A current sink is ON as long as the voltage applied at the
LINE pin is below the reference and is OFF if the voltage is above the reference.
This approach provides an additional degree of freedom: it is possible to set the ON
threshold and the OFF threshold separately by properly choosing the resistors of the
external divider (see below). With voltage hysteresis, instead, fixing one threshold
automatically fixes the other one depending on the built-in hysteresis of the comparator.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6599AFD | 功能描述:Power Supply Controller Resonant Converter Controller 16-SO 制造商:stmicroelectronics 系列:- 包装:管件 零件状态:有效 应用:谐振转换器控制器 电压 - 输入:- 电压 - 电源:8.85 V ~ 16 V 电流 - 电源:3.5mA 工作温度:-50°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商器件封装:16-SO 标准包装:50 |
| L6599AN | 功能描述:电压模式 PWM 控制器 Hi-Volt resonant controller, 500KHz RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6599ATD | 功能描述:电压模式 PWM 控制器 Sgl Output 13.3 V 200 KHz SOIC-16 Nrw RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6599ATDTR | 功能描述:开关变换器、稳压器与控制器 IMPROVED High-Volt RESONANT CONTROLLER RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6599ATN | 制造商:STMicroelectronics 功能描述: |
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