參數(shù)資料
型號: L5986
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 3.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
封裝: 3 X 3 MM, 1.08 MM HEIGHT, ROHS COMPLIANT, VFQFP-8
文件頁數(shù): 15/38頁
文件大?。?/td> 1067K
代理商: L5986
Application information
L5986
22/38
Doc ID 14971 Rev 3
6.4.2
Type II compensation network
If the equivalent series resistance (ESR) of the output capacitor introduces a zero with a
frequency lower than the desired bandwidth (that is: 2
πESRCOUT>1/BW), this zero helps
stabilize the loop. electrolytic capacitors show not negligible ESR (> 30 m
Ω), so with this
kind of output capacitor the type II network combined with the zero of the ESR allows
stabilizing the loop.
In Figure 13 the type II network is shown.
Figure 13.
Type II compensation network
The singularities of the network are:
In Figure 14 the Bode diagram of the PWM and LC filter transfer function (GPW0 GLC(f))
and the open loop gain (GLOOP(f) = GPW0 GLC(f) GTYPEII(f)) are drawn.
f
Z1
1
2
π R
4
C
4
------------------------------
=
f
P0
0
=
f
P1
1
2
π R
4
C
4
C
5
C
4
C
5
+
--------------------
--------------------------------------------
=
,,
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L5986A 功能描述:直流/直流開關調(diào)節(jié)器 2.5 A STEP-DOWN SWITCH REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5986ATR 功能描述:直流/直流開關調(diào)節(jié)器 Step-down switch regulator, 2.5A RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L5986TR 功能描述:直流/直流開關調(diào)節(jié)器 2.5 A Step-down Switch Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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