參數(shù)資料
型號： IRU3047
廠商： International Rectifier
元件分類： 基準電壓源/電流源
英文描述： DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
中文描述： 雙同步PWM控制器，帶有均流電路和LDO控制器
文件頁數(shù)： 11/19頁
文件大?。?/td> 141K
代理商： IRU3047
IRU3047
11
Rev. 1.0
09/09/02
www.irf.com
F
P3
=f
S
2
4)
Place third pole at the half of the switching frequency.
C
12
> 50pF
If not, change R
7
selection.
5)
Place R
7
in equation (16) and calculate C
10
:
6)
Place second pole at ESR zero.
F
P2
= F
ESR
Check if R
8
>
If R
8
is too small, increase R
7
and start from step 2.
7)
Place second zero around the resonant frequency.
F
Z2
= F
LC
8)
Use equation (1) to calculate R
5
:
These design rules will give a crossover frequency ap-
proximately one-tenth of the switching frequency. The
higher the band width, the potentially faster the load tran-
sient speed. The gain margin will be large enough to
provide high DC-regulation accuracy (typically -5dB to -
12dB). The phase margin should be greater than 45
8
for
overall stability.
The slave error amplifier is a differential-input transcon-
ductance amplifier as well, the main goal for the slave
feed back loop is to control the inductor current to match
the masters inductor current as well provides highest
bandwidth and adequate phase margin for overall stabil-
ity.
1
g
m
The transfer function of power stage is expressed by:
I
(s)
sL
2
×
V
OSC
As shown the transfer function is a function of inductor
current.
The transfer function for the compensation network is
given by equation (18), when using a series RC circuit
as shown in Figure 8.
( ) ( )
R
S2
×
I
L2
(s)
R
S2
Figure 8 - The PI compensation network
for slave channel.
The loop gain function is:
Select a zero crossover frequency (F
O2
) one-tenth of the
switching frequency:
F
O2
= 20KHz
Where:
V
IN
= Input Voltage
V
OUT
= Output Voltage
L
2
= Output Inductor
V
OSC
= Oscillator Peak Voltage
C
12
=
1
2
π ×
R
7
×
F
P3
C
10
≤
×
2
π ×
Lo
×
F
O
×
Co
R
7
V
OSC
V
IN
R
8
=
1
2
π ×
C10
×
F
P2
R
6
= 1
8
2
π ×
C10
×
F
Z2
R
5
= V
×
R
6
V
OUT
- V
REF
REF
L
2
L
1
C
2
R
2
R
S2
R
S1
Ve
I
L2
I
L1
E/A2
Fb2
Comp2
Vp2
F
O2
=f
S
10
G(s) = Ve(s)
V
IN
- V
OUT
D(s)= Ve(s)
g
m
×
×
---(18)
R
S1
1 + sC
2
R
2
sC
2
H(s)=[G(s)
×
D(s)
×
R
S2
]
H(s)=R
S2
×
( )
×
R
S1
R
S2
g
m
×
V
IN
-V
OUT
( )
1+sR
2
C
2
2
( )
×
相關PDF資料
PDF描述
IRU3047CW DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
IRU3048 DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
IRU3048CF DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
IRU3048CS DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
IRU3072C 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER
相關代理商/技術參數(shù)
參數(shù)描述
IRU3047CW 制造商:IRF 制造商全稱:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
IRU3047CWTR 功能描述:IC REG CTRLR BUCK PWM VM 20-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
IRU3048 制造商:IRF 制造商全稱:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
IRU3048CF 制造商:IRF 制造商全稱:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
IRU3048CFTR 功能描述:IC REG CTRLR BUCK PWM VM 16TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:75 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.3 V ~ 13.5 V 降壓:是 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:0°C ~ 70°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:管件 產品目錄頁面:1051 (CN2011-ZH PDF) 其它名稱:296-2543-5
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(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*