- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377541 > IRU3007CW (International Rectifier) 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK, NON-SYNCHRONOUS,ADJUSTABLE LDO AND 200mA ON-BOARD LDO PDF資料下載
參數(shù)資料
| 型號： | IRU3007CW |
| 廠商： | International Rectifier |
| 英文描述： | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK, NON-SYNCHRONOUS,ADJUSTABLE LDO AND 200mA ON-BOARD LDO |
| 中文描述： | 5位可編程同步降壓，非同步，可調(diào)LDO和200mA的板上穩(wěn)壓器 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 100K |
| 代理商： | IRU3007CW |
IRU3007
13
Rev. 2.1
08/20/02
www.irf.com
D
MIN
≈
(3.3 + 0.5) / (5.25 - 0.27 + 0.5) = 0.69
P
DD
= (1 - D
MIN
)
×
Io
×
Vf
P
DD
= (1 - 0.69)
×
10
×
0.5 = 1.55W
For Vo = 1.5V, V
IN
= 3.3V and I
L
= 2A:
R
DS(MAX)
= (V
IN
- Vo) / I
L
= (3.3 - 1.5) / 2 = 0.9
Note:
Since the MOSFETs R
DS(ON)
increases with tem-
perature, this number must be divided by
≈
1.5, in order
to find the R
DS(ON)
max at room temperature. The Motorola
MTP3055VL has a maximum of 0.18
R
DS(ON)
at room
temperature, which meets our requirement.
Vcs = I
CL
×
R
DS
= 22
×
0.019 = 0.418V
Rcs = Vcs / I
B
= (0.418V) / (200
μ
A) = 2.1K
P
DH
= D
MAX
×
Io
2
×
R
DS(MAX)
P
DH
= 0.76
×
10
2
×
0.029 = 2.21W
R
DS(MAX)
= Maximum R
DS(ON)
of the MOSFET at 125
8
C
For diode, the maximum power dissipation happens at
minimum Vo and minimum duty cycle.
Switcher Current Limit Protection
The IRU3007 uses the MOSFET R
DS(ON)
as the sensing
resistor to sense the MOSFET current and compares to
a programmed voltage which is set externally via a re-
sistor (Rcs) placed between the drain of the MOSFET
and the “CS+” terminal of the IC as shown in the appli-
cation circuit.
For example, if the desired current limit point is set to
be 22A for the synchronous and 16A for the non syn-
chronous, and from our previous selection, the maxi-
mum MOSFET R
DS(ON)
=19mW, then the current sense
resistor Rcs is calculated as:
Vcore
Where:
I
B
=200
μ
A is the internal current setting of the
IRU3007
3.3V supply
Vcs = I
CL
×
R
DS
= 16
×
0.019 = 0.3V
Rcs = Vcs / I
B
= (0.3V) / (200
μ
A) = 1.50K
1.5V, GTL+ Supply LDO Power MOSFET Selection
The first step in selecting the power MOSFET for the
1.5V linear regulator is to select its maximum R
DS(ON)
of
the pass transistor based on the input to output Dropout
voltage and the maximum load current.
To select the heat sink for the LDO MOSFET the first
step is to calculate the maximum power dissipation of
the device and then follow the same procedure as for the
switcher.
Where:
P
D
= Power Dissipation of the Linear Regulator
I
L
= Linear Regulator Load Current
For the 1.5V and 2A load:
P
D
= (V
IN
- Vo)
×
I
L
P
D
= (3.3 - 1.5)
×
2 = 3.6W
Assuming T
J(MAX)
= 125
8
C:
Ts = T
J
- P
D
×
(
θ
JC
+
θ
cs)
Ts = 125 - 3.6
×
(1.8 + 0.05) = 118
8
C
With the maximum heat sink temperature calculated in
the previous step, the heat-sink-to-air thermal resistance
(
θ
SA
) is calculated as follows:
Assuming T
A
= 35
8
C:
T = Ts - T
A
= 118 - 35 = 83
8
C
Temperature Rise Above Ambient
θ
SA
=
T / P
D
= 83 / 3.6 = 23
8
C/W
The same heat sink as the one selected for the switcher
MOSFETs is also suitable for the 1.5V regulator.
2.5V Clock Supply
The IRU3007 provides a complete 2.5V regulator with a
minimum of 200mA current capability. The internal regu-
lator has short circuit protection with internal thermal
shutdown.
1.5V and 2.5V Supply Resistor Divider Selection
Since the internal voltage reference for the linear regula-
tors is set at 1.26V for IRU3007, there is a need to use
external resistor dividers to step up the voltage. The re-
sistor dividers are selected using the following equations:
Where:
Rt = Top resistor divider
R
B
= Bottom resistor divider
V
REF
= 1.26V typical
For 1.5V supply
Assuming R
B
= 1K
:
Rt = R
B
×
[
(Vo / V
REF
) - 1
]
Rt = 1
×
[
(1.5 / 1.26) - 1
]
= 191
Vo = (1 + Rt / R
B
)
×
V
REF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IRU3011 | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC |
| IRU3011CW | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC |
| IRU3018 | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON-BOARD |
| IRU3018CW | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON-BOARD |
| IRU3021M | 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPLE LDO CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRU3007CWTR | 功能描述:IC CTRL/REG SYNC BUCK 28-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| IRU3008CWTR | 功能描述:IC REG 24-SOIC(W) RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| IRU3010CW | 制造商:International Rectifier 功能描述:SWITCHING CONTROLLER |
| IRU3010CWTR | 功能描述:IC REG BUCK SYNC 20SOIC(W) RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| IRU3011 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。