參數(shù)資料
型號(hào)： L6716
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48
文件頁(yè)數(shù)： 44/57頁(yè)
文件大?。?/td> 829K
代理商： L6716
L6716
Tolerance band (TOB) definition
Doc ID 14521 Rev 3
49/57
23
Tolerance band (TOB) definition
Output voltage load-line varies considering component process variation, system
temperature extremes, and age degradation limits. Moreover, individual tolerance of the
components also varies among designs: it is then possible to define a manufacturing
tolerance band (TOBManuf) that defines the possible output voltage spread across the
nominal load line characteristic.
TOBManuf can be sliced into different three main categories: controller tolerance, external
current sense circuit tolerance and time constant matching error tolerance. All these
parameters can be composed thanks to the RSS analysis so that the manufacturing
variation on TOB results to be:
Output voltage ripple (VP=VPP/2) and temperature measurement error (VTC) must be added
to the manufacturing TOB in order to get the system tolerance band as follow:
All the component spreads and variations are usually considered at 3
σ. Here follows an
explanation on how to calculate these parameters for a reference L6716 application.
23.1
Controller tolerance (TOBController)
It can be further sliced as follow:
Reference tolerance. L6716 is trimmed during the production stage to ensure the output
voltage to be within kVID = ±0.5% over temperature and line variations. In addition, the
device automatically adds a -19 mV offset avoiding the use of any external component. This
offset is already included during the trimming process in order to avoid the use of any
external circuit to generate this offsets and, moreover, avoiding the introduction of any
further error to be considered in the TOB calculation.
Current reading circuit. The device reads the current flowing across the inductor DCR by
using its dedicated differential inputs. The current sourced by the VRD is then reproduced
and sourced from the FB pin scaled down by a proper designed gain as follow:
This current multiplied by the RFB resistor connected from FB pin vs. the load allows
programming the droop function according to the selected DCR/Rg gain and RFB resistor.
Deviations in the current sourced due to errors in the current reading, impacts on the output
voltage depending on the size of RFB resistor. The device is trimmed during the production
stage in order to guarantee a maximum deviation of kIFB = ± 3 μA from the nominal value.
Controller tolerance results then to be:
TOB
Manuf
TOB
Controller
2
TOB
CurrSense
2
TOB
TCMatching
2
++
=
TOB
Manuf
V
P
V
TC
++
=
I
DROOP
DCR
Rg
------------- I
OUT
=
TOB
Controller
VID
19mV
–
() k
VID
[]
2
k
IDROOP
R
FB
()
2
+
=
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參數(shù)描述
L6716TR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 2/3/4 phase CNTRL Embedded Drivers RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
L6717 制造商:STMicroelectronics 功能描述:High-Efficiency Hybrid AM2r2 Controller 48-Pin VFQFPN Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver
L6717A 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver
L6717ATR 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller T/R 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Tape and Reel 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver
L6717TR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 High-Efficienc AM2r2 Hybrid Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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