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參數(shù)資料
| 型號(hào)： | IR3621MPBF |
| 廠商： | International Rectifier |
| 英文描述： | 2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP |
| 中文描述： | 2相/雙同步PWM控制器，帶有振蕩器同步操作和預(yù)偏置啟動(dòng) |
| 文件頁(yè)數(shù)： | 11/29頁(yè) |
| 文件大?。?/td> | 389K |
| 代理商： | IR3621MPBF |
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IR3621 & (PbF)
11
www.irf.com
APPLICATION INFORMATION
Design Example:
The following example is a typical application for the
IR3621, the schematic is Figure19 on page18.
V
IN
= 12V
V
OUT(2.5V)
= 2.5V @ 10A
V
OUT(1.8V)
= 1.8V @ 10A
V
OUT
= Output voltage ripple
3% of V
OUT
F
S
= 400kHz
Output Voltage Programming
Output voltage is programmed by the reference voltage
and an external voltage divider. The Fb1 pin is the invert-
ing input of the error amplifier, which is referenced to the
voltage on the non-inverting pin of error amplifier. For this
application, this pin (V
P2
) is connected to the reference
voltage (V
REF
). The output voltage is defined by using the
following equation:
R
6
R
5
( )
When an external resistor divider is connected to the
output as shown in Figure 11.
Figure 11 - Typical application of the IR3621 for pro-
gramming the output voltage.
Equation (4) can be rewritten as:
R
6
= R
5
×
- 1
Will result to:
V
OUT(2.5V)
= 2.5V
V
REF
= 0.8V
R
9
= 2.15K,
R
5
= 1K
If the high value feedback resistors are used, the input
bias current of the Fb pin could cause a slight increase
in output voltage. The output voltage can be set more
accurately by using low value, precision resistors.
For a start-up time of 4ms for both output, the soft-start
capacitor will be 0.1
μ
F. Connect two 0.1
μ
Fceramic
capacitors from SS1 pin and SS2 pin to GND.
Supply VcH1 and VcH2
To drive the high side MOSFET, it is necessary to sup-
ply a gate voltage at least 4V greater than the bus volt-
age. This is achieved by using a charge pump configu-
ration as shown in Figure 12. This method is simple
and inexpensive. The operation of the circuit is as fol-
lows: when the lower MOSFET is turned on, the ca-
pacitor (C1) charges up to V
OUT3
, through the diode
(D1). The bus voltage will be added to this voltage when
upper MOSFET turns on in next cycle, and providing
supply voltage (VcH1) through diode (D2). VcH1 is ap-
proximately:
VCH1
V
OUT3
+ V
BUS
- (V
D1
+ V
D2
)
Capacitor in the range of 0.1
μ
F is generally adequate
for most applications. The diode must be a fast recov-
ery device to minimize the amount of charge fed back
from the charge pump capacitor into V
OUT3
. The diodes
need to be able to block the full power rail voltage, which
is seen when the high side MOSFET is switched on.
For low voltage application, Schottky diodes can be
used to minimize forward drop across the diodes at
start up.
Figure 12 - Charge pump circuit.
V
OUT
V
P
( )
Fb
IR3621
V
OUT
R
5
R
6
V
REF
V
P2
L2
IR3621
D1
C1
VcH1
HDrv
Regulator
Q1
Q2
V
OUT3
C2
V
BUS
D2
C3
Css
28
×
t
START
(
μ
F) ---(5)
Where
t
START
is the desired start-up time (ms)
V
OUT
= V
P2
×
1 +
---(4)
V
P2
= V
REF
= 0.8V
V
OUT(1.8V)
= 1.8V
V
REF
= 0.8
R
7
= 1.24K, R
8
= 1K
Soft-Start Programming
The soft-start timing can be programmed by selecting
the soft-start capacitance value. The start-up time of
the converter can be calculated by using:
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參數(shù)描述 |
|---|---|
| IR3621MTR | 功能描述:IC REG CTRLR BUCK PWM VM 32MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)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(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| IR3621MTRPBF | 功能描述:DC/DC 開關(guān)控制器 2-PHASE DUAL SYNC PWM CTRLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK |
| IR3621PBF | 制造商:IRF 制造商全稱:International Rectifier 功能描述:2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP |
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