參數資料
型號： TPS51116PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 6 A SWITCHING CONTROLLER, PDSO20
封裝： GREEN, PLASTIC, HTSSOP-20
文件頁數： 7/40頁
文件大?。?/td> 931K
代理商： TPS51116PWPR
Soft-Start and Powergood
VOCL
VVDDQ
VPGOOD
VS5
80%
87%
100%
85
s
45
s
UDG04066
T
VDDQSS +
2
C
VDDQ
V
VDDQ
0.8
I
VDDQOCP
) 85 ms
(2)
T
VTTSS +
C
VTT
V
VTT
I
VTTOCL
(3)
www.ti.com................................................................................................................................................................ SLUS609H – MAY 2004 – REVISED JULY 2009
The soft start function of the SMPS is achieved by ramping up reference voltage and two-stage current clamp. At
the starting point, the reference voltage is set to 650 mV (87% of its target value) and the overcurrent threshold
is set half of the nominal value. When UVP comparator detects VDDQ become greater than 80% of the target,
the reference voltage is raised toward 750 mV using internal 4-bit DAC. This takes approximately 85
s. The
overcurrent threshold is released to nominal value at the end of this period. The powergood signal waits another
45
s after the reference voltage reaches 750 mV and the VDDQ voltage becomes good (above 95% of the
target voltage), then turns off powergood open-drain MOSFET.
The soft-start function of the VTT LDO is achieved by current clamp. The current limit threshold is also changed
in two stages using an internal powergood signal dedicated for LDO. During VTT is below the powergood
threshold, the current limit level is cut into 60% (2.2 A).This allows the output capacitors to be charged with low
and constant current that gives linear ramp up of the output. When the output comes up to the good state, the
overcurrent limit level is released to normal value (3.8 A). TPS51116 has an independent counter for each
output, but the PGOOD signal indicates only the status of VDDQ and does not indicate VTT powergood
externally. See Figure 1.
Figure 1. VDDQ Soft-Start and Powergood Timing
Soft-start duration, TVDDQSS, TVTTSS are functions of output capacitances.
where IVDDQOCP is the current limit value for VDDQ switcher calculated by Equation 5.
where, IVTTOCL = 2.2 A (typ). In each of the two previous calculations, no load current during start-up are
assumed. Note that both switchers and the LDO do not start up with full load condition.
Copyright 2004–2009, Texas Instruments Incorporated
15
Product Folder Link(s): TPS51116
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相關代理商/技術參數
參數描述
TPS51116PWPRG4 功能描述:DC/DC 開關控制器 DDR2 SWITCHER AND LDO 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
TPS51116RGE 功能描述:IC DDR SYNC BUCK CTRL REF 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數:10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應商設備封裝:42-WLP 包裝:帶卷 (TR)
TPS51116RGER 功能描述:DC/DC 開關控制器 DDR2 SWITCHER AND LDO 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
TPS51116RGERG4 功能描述:DC/DC 開關控制器 DDR2 SWITCHER AND LDO 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
TPS51116RGET 功能描述:DC/DC 開關控制器 DDR2 SWITCHER AND LDO 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
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