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參數(shù)資料
| 型號(hào)： | IRU3048CF |
| 廠商： | International Rectifier |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER |
| 中文描述： | 雙同步PWM控制器電路和LDO控制器 |
| 文件頁(yè)數(shù)： | 7/18頁(yè) |
| 文件大?。?/td> | 154K |
| 代理商： | IRU3048CF |
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IRU3048
7
Rev. 1.7
09/12/02
www.irf.com
For
i
1
=25% of I
1
, we get L
1
=9.9
μ
H
For
i
2
=25% of I
2
, we get: L
2
=5.7
μ
H
Panasonic provides a range of inductors in different val-
ues and low profile for large currents.
For L
1
choose ETQP6F102HFA (10.2
μ
H, 4A)
For L
2
choose ELLATV6R8M (6.8
μ
H, 4A)
Power MOSFET Selection
The selections criteria to meet power transfer require-
ments is based on maximum drain-source voltage (V
DSS
),
gate-source drive voltage (V
GS
), maximum output cur-
rent, On-resistance R
DS(ON)
and thermal management.
The MOSFET must have a maximum operating voltage
(V
DSS
) exceeding the maximum input voltage (V
IN
).
The gate drive requirement is almost the same for both
MOSFETs. Caution should be taken with devices at very
low V
GS
to prevent undesired turn-on of the complemen-
tary MOSFET, which results a shoot-through current.
The total power dissipation for MOSFETs includes con-
duction and switching losses. For the Buck converter
the average inductor current is equal to the DC load cur-
rent. The conduction loss is defined as:
The total conduction loss is defined as:
The R
DS(ON)
temperature dependency should be consid-
ered for the worst case operation. This is typically given
in the MOSFET data sheet. Ensure that the conduction
losses and switching losses do not exceed the package
ratings or violate the overall thermal budget.
For this design, IRF7313 is a good choice. These de-
vices provide low on-resistance in a compact SOIC 8-
Pin package.
The MOSFETs have the following data:
The total conduction losses for channel 1 is:
The total conduction losses for channel 2 is:
The control MOSFET contributes to the majority of the
switching losses in synchronous Buck converter. The
synchronous MOSFET turns on under zero-voltage con-
dition, therefore the turn on losses for synchronous
MOSFET can be neglected. With a linear approxima-
tion, the total switching loss can be expressed as:
t
r
+
t
f
T
Figure 4 - Switching time waveforms.
From IRF7313 data sheet we obtain:
IRF7313
t
r
= 13ns
t
f
= 26ns
These values are taken under a certain condition test.
For more detail please refer to the IRF7313 data sheet.
By using equation (6), we can calculate the switching
losses.
P
CON1
= 1.1W
P
CON2
= 1.1W
IRF7313
V
DSS
= 30V
I
D
= 5.2A @ 70
8
C
R
DS(ON)
= 46m
@ V
GS
=4.5V
= 1.5 for 150
8
C (Junction Temperature)
Where:
V
DS(OFF)
= Drain to Source Voltage at off time
t
r
= Rise Time
t
f
= Fall Time
T = Switching Period
I
LOAD
= Load Current
P
SW
= V
×
×
I
LOAD
---(6)
2
DS(OFF)
2
2
P
COND
(Upper Switch) = I
LOAD
×
R
DS(ON)
×
D
×
P
COND
(Lower Switch) = I
LOAD
×
R
DS(ON)
×
(1 - D)
×
= R
DS(ON)
Temperature Dependency
P
CON(TOTAL)
=P
CON
(Upper Switch)
+P
CON
(Lower Switch)
P
SW1
= 187.2mW
P
SW2
= 78mW
V
DS
90%
V
GS
10%
t
d
(ON)
t
d
(OFF)
t
r
t
f
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(biāo)準(zhǔn)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(chǎn)品目錄頁(yè)面:1051 (CN2011-ZH PDF) 其它名稱:296-2543-5 |
| IRU3048CS | 制造商:IRF 制造商全稱:International Rectifier 功能描述:DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER |
| IRU3048CSTR | 功能描述:IC REG CTRLR BUCK PWM VM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(chǎn)品目錄頁(yè)面:1051 (CN2011-ZH PDF) 其它名稱:296-2543-5 |
| IRU3048CSTRPBF | 制造商:International Rectifier 功能描述:Dual Synchronous PWM Controller Circuitry and LDO Controller 16-Pin SOIC N T/R |
| IRU3055 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC |
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