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| 型号： | TPS40060PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSOOP-16 |
| 文件页数： | 2/33页 |
| 文件大小： | 750K |
| 代理商： | TPS40060PWPG4 |
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PROGRAMMING SOFT START
t
START w 2p
L
C
O
(seconds)
(4)
C
SS +
2.3 mA
0.7 V
t
START
(Farads)
(5)
SLUS543E – DECEMBER 2002 – REVISED JUNE 2006
APPLICATION INFORMATION (continued)
The impedance of the input voltage can cause the input voltage, at the TPS4006x, to sag when the converter
starts to operate and draw current from the input source. Therefore, there is voltage hysteresis that prevents
nuisance shutdowns at the UVLO point.
With RT chosen to select the operating frequency and RKFF chosen to select the start-up voltage, the amount
of hysteresis voltage is shown in Figure 5.
TPS4006x uses a closed-loop approach to ensure a controlled ramp on the output during start-up. Soft-start is
programmed by charging an external capacitor (CSS) via an internally generated current source. The voltage on
CSS minus 0.85 V, is fed into a separate non-inverting input to the error amplifier (in addition to FB and 0.7-V
VREF). The loop is closed on the lower of the (CSS– 0.85 V) voltage or the internal reference voltage ( 0.7-V
VREF). Once the (CSS– 0.85 V) voltage rises above the internal reference voltage, regulation is based on the
internal reference. To ensure a controlled ramp-up of the output voltage the soft-start time should be greater
There is a direct correlation between tSTART and the input current required during start-up. The faster tSTART, the
higher the input current required during start-up. This relationship is describe in more detail in the section titled,
Programming the Current Limit which follows. The soft-start capacitance, CSS, is described in Equation 5.
For applications in which the VIN supply ramps up slowly, (typically between 50 ms and 100 ms) it may be
necessary to increase the soft-start time to between approximately 2 ms and 5 ms to prevent nuisance UVLO
tripping. The soft-start time should be longer than the time that the VINsupply transitions between 6 V and 7 V.
10
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相关代理商/技术参数 |
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| TPS40060PWPR | 功能描述:DC/DC 开关控制器 Wide Input Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40060PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40061 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40061PWP | 功能描述:DC/DC 开关控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40061PWP | 制造商:Texas Instruments 功能描述:IC 制造商:Texas Instruments 功能描述:IC, SYNC BUCK DC/DC CONTROLLER, 16-HTSSOP |
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