- 您現在的位置：買賣IC網 > PDF目錄384511 > IRU3072CH (International Rectifier) 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER PDF資料下載
參數資料
| 型號： | IRU3072CH |
| 廠商： | International Rectifier |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER |
| 中文描述： | 20引腳同步PWM控制器/ 3 LDO控制器 |
| 文件頁數： | 15/24頁 |
| 文件大?。?/td> | 332K |
| 代理商： | IRU3072CH |
IRU3072
15
Rev. 1.0
3/25/04
www.irf.com
Design Example
Input voltage for buck converter: V
IN
=12V
Output voltage for buck converter: V
OUT
=1.2V
Nominal output current from switching regulator: I
OUT
=8A
Output current limit is 10A.
Switching frequency: F
S
=400KHz
The maximum dynamic output voltage droop at 8A step
load is 150mV.
LDO specification
LDO input voltage: V
IN(LDO)
=3.3V
LDO output1: V
OUT2
=2.5V @ 2A
LDO output2: V
OUT3
=1.8V @ 2A
LDO output3: V
OUT4
=1.5V @ 2A
Output inductor selection
The inductor is selected based on the inductor current
ripple, operation frequency and efficiency consideration.
In general, a large inductor results in a small output ripple
and higher efficiency but large size. A small value induc-
tor causes large current ripple and poor efficiency but
small size. Generally, the inductor is selected based on
the output current ripple. The optimum point is usually
found between 20% and 50% ripple of output inductor
current.
Suppose the ripple is selected as 40% of the total out-
put current.
I
PK_PK
/I
OUT
= 40%
The current ripple is calculated as:
I
PK_PK
= (V
IN
-V
OUT
)
×
V
OUT
/(L
×
F
S
×
V
IN
)
Combining of above two equations, the inductance can
be selected by:
L > V
OUT
×
(V
IN
-V
OUT
)/(F
S
×
V
IN
×
40%
×
I
OUT
)
In this example,
L > 1.2V
×
(12 - 1.2)/(400KHz
×
12V
×
0.4
×
8A)
L > 0.8
μ
H
Select inductor from Panasonic so that L=1
μ
H. The ripple
current is calculated as:
I
PK_PK
= (12 - 1.2)
×
1.2/(1
μ
H
×
400KHz
×
12)
I
PK_PK
2.7A
Figure 22 - Operation of PWM output and LDO
when LDO V
OUT2
is short.
Figure 23 - Soft-start with output is short to ground.
Switching frequency
The switching frequency of IRU3072 can be selected by
the following figure.
Figure 24 - Switching frequency versus resistor Rt.
0
50
100
150
200
250
300
350
400
450
500
0
50
100
150
200
Rt (K
)
F
相關PDF資料 |
PDF描述 |
|---|---|
| IRU3137 | 8-PIN SYNCHRONOUS PWM CONTROLLER |
| IRU3137CS | 8-PIN SYNCHRONOUS PWM CONTROLLER |
| IRU3146 | DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND AUTO-RESTART |
| IRU3146CF | DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND AUTO-RESTART |
| IRXXH214 | POWIRLIGHTTM REFERENCE DESIGN : COMPACT BALLAST |
相關代理商/技術參數 |
參數描述 |
|---|---|
| IRU3072CHTR | 制造商:International Rectifier 功能描述:VOLT MODE PWM CNTRLR 0.8V TO 24.75V/1.5V/1.8V/2.5V 1A 20MLPQ - Tape and Reel |
| IRU3073 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER WITH OVER-CURRENT PROTECTION / LDO CONTROLLER |
| IRU3073CQ | 制造商:IRF 制造商全稱:International Rectifier 功能描述:SYNCHRONOUS PWM CONTROLLER WITH OVER-CURRENT PROTECTION / LDO CONTROLLER |
| IRU3073CQTR | 功能描述:IC REG DL BCK/LINEAR 16-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標準包裝:2,500 系列:- 拓撲:降壓（降壓）同步（2），線性（LDO）（1） 功能:任何功能 輸出數:3 頻率 - 開關:300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅動器:無 帶監(jiān)控器:無 帶序列發(fā)生器:是 電源電壓:4.5 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:28-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:* 包裝:帶卷 (TR) 其它名稱:ISL6402IVZ-TTR |
| IRU3137 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:8-PIN SYNCHRONOUS PWM CONTROLLER |
發(fā)布緊急采購，3分鐘左右您將得到回復。