- 您现在的位置：买卖IC网 > PDF目录296207 > IR3629 (International Rectifier) HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT PDF资料下载
参数资料
| 型号： | IR3629 |
| 厂商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| 中文描述： | 高频同步PWM降压控制器与电源良好输出 |
| 文件页数： | 3/23页 |
| 文件大小： | 598K |
| 代理商： | IR3629 |
IR3629/IR3629A MPbF
11/26/2007
Application Information
Design Example:
The following example is a typical application for
IR3629. The application circuit is shown on page
18.
Output Voltage Programming
Output voltage is programmed by reference
voltage and external voltage divider. The Fb pin
is the inverting input of the error amplifier, which
is internally referenced to 0.6V. The divider is
ratioed to provide 0.6V at the Fb pin when the
output is at its desired value. The output voltage
is defined by using the following equation:
When an external resistor divider is connected to
the output as shown in figure 10.
Equation (4) can be rewritten as:
For the calculated values of R
8
and R
9 see
feedback compensation section.
kHz
600
=
F
pple)
voltage ri
mV(output
30
≤
ΔV
A
12
=
I
V
5
.
1
=
V
)
max
V,
2
.
13
V,(
12
=
V
s
o
in
)
4
--(
R
1
V
9
8
ref
o
+
=
Fig. 10: Typical application of the IR3629 for
programming the output voltage
)
5
--(
V
R
ref
O
ref
8
9
=
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:
Where T
start is the desired start-up time (ms).
For a start-up time of 10ms, the soft-start
capacitor will be 0.2uF. Choose a ceramic
capacitor at 0.22uF.
Vc supply for single input voltage
To drive the high side switch, it is necessary to
supply a gate voltage at least 4V greater than the
bus voltage. This is achieved by using a charge
pump configuration as shown in figure 11. This
method is simple and inexpensive. The operation
of the circuit is as follows: when the lower
MOSFET is turned on, the capacitor
(C1) is
pulled down to ground and charges, up to V
BUS
value, through the diode (D1). The bus voltage
will be added to this voltage when the upper
MOSFET turns on in the next cycle, and
providing supply voltage (Vc) through diode (D2).
Vc is approximately:
A capacitors in the range of 0.1uF is generally
adequate for most applications. Fast recovery
diodes must be used to minimize the amount of
charge fed back from the charge pump capacitor
into V
BUS. 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 applications, schottky diodes can be
used to minimize forward drop.
L
IR3624
D1
C1
Vc
HDrv
Q1
Q2
C2
VBUS
D2
C3
VBUS
Fig. 11: Charge pump circuit to generate
Vc voltage
(
)
)
6
--(
V
2
V
2
D
1
D
bus
C
+
)
1
--(
T
A
20
C
start
SS
*
μ
Fb
IR3624
VOUT
R9
R8
IR3629
11
IR3629/29A
相关PDF资料 |
PDF描述 |
|---|---|
| IR3810MPBF | HIGHLY INTEGRATED 12A WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR3812MPBF | HIGHLY INTEGRATED 4A WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR82C55A | 24 I/O, PIA-GENERAL PURPOSE, CQCC44 |
| IRF3007LPBF | 62 A, 75 V, 0.0126 ohm, N-CHANNEL, Si, POWER, MOSFET, TO-262AA |
| IRF3205ZSTRLPBF | 75 A, 55 V, 0.0065 ohm, N-CHANNEL, Si, POWER, MOSFET, TO-263AB |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3629A | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER WITH POWER GOOD OUTPUT |
| IR3629AMTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| IR3629MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| IR3629MTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。