參數資料
型號： TPS40057MPWPREP
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： PLASTIC, HTSSOP-16
文件頁數： 5/33頁
文件大小： 755K
代理商： TPS40057MPWPREP
www.ti.com
E
L +
1
2
L
I2 (Joules)
(6)
I2 +
I
OH
2
* IOL
2
(Amperes)
2
(7)
R
A +
R
KFF
(8 * 3.5)
0.1
V
IN(min) * 3.5
+ 495 kW ^ 499 kW
(8)
C
A +
(8 * 3.5)
R
A
7.9
f
SW
(9)
SGLS310A – JULY 2005 – REVISED AUGUST 2005
APPLICATION INFORMATION (continued)
The output capacitance requirement typically increases in the presence of a load transient requirement. During a
step load, the output capacitance must provide energy to the load (light-to-heavy load step) or absorb excess
inductor energy (heavy-to-light load step) while maintaining the output voltage within acceptable limits. The
amount of capacitance depends on the magnitude of the load step, the speed of the loop and the size of the
inductor.
Stepping the load from a heavy load to a light load results in an output overshoot. Excess energy stored in the
inductor must be absorbed by the output capacitance. The energy stored in the inductor is described in
where:
IOH is the output current under heavy load conditions
IOL is the output current under light load conditions
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) = 10 V, the value of
RA is calculated by Equation 8 using a RKFF = 71.5 k.
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.
The value of CA may calculate to less than 10 pF, but some standard value up to 47 pF works adequately. The
diode can be a small signal switching diode or Schottky rated for more then 20 V. Figure 9 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.
13
相關PDF資料
PDF描述
TPS40090RHDRG4 SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28
TPS40091RHDR SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28
TPS40090PWRG4 SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24
TPS40091PWG4 SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24
TPS40091RHDRG4 SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28
相關代理商/技術參數
參數描述
TPS40057PWP 功能描述:DC/DC 開關控制器 Wide Input Sync Buck src/sink w/prebias 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
TPS40057PWP 制造商:Texas Instruments 功能描述:CONTROLLER IC
TPS40057PWPG4 功能描述:DC/DC 開關控制器 Wide Input Sync Buck src/sink w/prebias 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
TPS40057PWPR 功能描述:DC/DC 開關控制器 Wide Input Sync Buck src/sink w/prebias 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
TPS40057PWPRG4 功能描述:DC/DC 開關控制器 Wide Input Sync Buck src/sink w/prebias 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 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數量 廠商 批號 封裝
添加更多采購

我的聯系方式

*
*
*