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| 型号： | TPS40050PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 2/36页 |
| 文件大小： | 648K |
| 代理商： | TPS40050PWP |
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TPS40050
TPS40051
TPS40053
SLUS540F DECEMBER 2002 REVISED JUNE 2004
www.ti.com
10
APPLICATION INFORMATION
Once the soft-start is initiated, the UVLO cicruit must see a total count of seven cycles in which the ramp duration
is longer than the clock cycle before an undervoltage condition is declared. (See Figure 4).
UDG02132
Clock
PWM RAMP
PowerGood
VIN
UVLO Threshold
1 2 3 4 5 6 7
1 2
Figure 4. Undervoltage Lockout Operation
Some applications may require an additional circuit to prevent false restarts at the UVLO voltage level. This
applies to applications which have high impedance on the input voltage line or which have excessive ringing
on the VIN line. The input voltage impedance can cause the input voltage to sag enough at start-up to cause
a UVLO shutdown and subsequent restart. Excessive ringing can also affect the voltage seen by the device
and cause a UVLO shutdown and restart. A simple external circuit provides a selectable amount of hysteresis
to prevent the nuisance UVLO shutdown.
Assuming a hysteresis current of 10% IKFF, and the peak detector charges to 8 V and VIN(min) = 18 V, the value
of RA is calculated by:
R
A +
R
KFF
(8
* 3.5)
0.1
V
IN(min) * 3.5
+ 565 kW ^ 562 kW
CA is chosen to maintain the peak voltage between switching cycles. To keep the capacitor charge from
drooping 0.1-V, or from 8 V to 7.9 V.
C
A +
(8
* 3.5)
R
A
7.9
f
SW
The value of CA imay calculate to less than 10 pF, but some standard value up to 470 pF works adequately.
The diode can be a small signal switching diode or Schottky rated for more then 20 V. Figure 5 illustrates a typical
implementation using a small switching diode.
The tolerance on the UVLO set point also affects the maximum duty cycle achievable. If the UVLO starts the
device at 10% below the nominal start up voltage, the maximum duty cycle is reduced approximately 10% at
the nominal start up voltage.
(4)
(5)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40050PWPG4 | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050PWPR | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050PWPRG4 | 功能描述:DC/DC 开关控制器 Wide Input Vltg 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 |
| TPS40050-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40050QPWPRQ1 | 功能描述:DC/DC 开关控制器 Auto Cat Wide-Input Synch Buck 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 |
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