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參數(shù)資料
| 型號： | L6910A |
| 廠商： | 意法半導體 |
| 英文描述： | ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| 中文描述： | 可調(diào)降壓控制器采用同步整流 |
| 文件頁數(shù)： | 10/21頁 |
| 文件大?。?/td> | 453K |
| 代理商： | L6910A |
L6910A L6910
10/21
Figure 7. Compensation Network
The compensation network consists in the internal error amplifier and the impedance networks Z
IN
(R3, R4 and
C20) and Z
FB
(R5, C18 and C19). The compensation network has to provide a closed loop transfer function with
the highest 0dB crossing frequency to have fast response (but always lower than fsw/10) and the highest gain
in DC conditions to minimize the load regulation.
A stable control loop has a gain crossing with -20dB/decade slope and a phase margin greater than 45°. Include
worst-case component variations when determining phase margin.
To locate poles and zeroes of the compensation networks, the following suggestions may be used:
Modulator singularity frequencies:
1
L C
OUT
Compensation network singularity frequency:
– Put the gain R5/R3 in order to obtain the desired converter bandwidth;
– Place
ω
Z1
before the output filter resonance
ω
LC
;
– Place
ω
Z2
at the output filter resonance
ω
LC
;
– Place
ω
P1
at the output capacitor ESR zero
ω
ESR
;
– Place
ω
P2
at one half of the switching frequency;
– Check the loop gain considering the error amplifier open loop gain.
Vin
L
ESR
Cout
R3
R5
C19
EAREF
Vcomp
PWM
Comparator
Vout
Vosc
R4
C18
C20
+
-
ω
LC
---------------------------
ω
ESR
1
ESR C
OUT
--------------------------------
=
=
ω
P1
1
R5
C18
+
C19
----------------------------
-----------------------------------------------
ω
P2
1
R4 C20
-----------------------
=
=
ω
Z1
1
R5 C19
-----------------------
ω
Z2
1
R3
R4
+
(
)
C20
------------------------------------------
=
=
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6910ATR | 功能描述:DC/DC 開關控制器 5.0 to 12V Step-Down 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(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| L6910G | 功能描述:電壓模式 PWM 控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| L6910GTR | 功能描述:電壓模式 PWM 控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| L6910R | 功能描述:DC/DC 開關控制器 5.0 to 12V Step-Down 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(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| L6910RTR | 功能描述:DC/DC 開關控制器 5.0 to 12V Step-Down 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(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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