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参数资料
| 型号： | IR3628MPBF |
| 厂商： | International Rectifier |
| 英文描述： | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER |
| 中文描述： | 高频同步PWM降压控制器 |
| 文件页数： | 3/22页 |
| 文件大小： | 581K |
| 代理商： | IR3628MPBF |
IR3628MPbF
08/10/2007
Application Information
Design Example:
The following example is a typical application for
IR3628. The application circuit is shown in
page18.
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 tracking applications replace Vref to Vp in
equation (5).
For the calculated values of R
8
and R
9 see
feedback compensation section.
)
(
max
Ripple
Voltage
Output
mV
ΔV
A
I
V
.
V
)
V,
.
V,(
V
o
in
30
10
9
0
2
13
12
≤
=
)
4
--(
R
1
V
9
8
ref
o
+
=
Fig. 10: Typical application of the IR3628 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 grater 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 upper
MOSFET turns on in next cycle, and providing
supply voltage (Vc) through diode (D2). Vc is
approximately:
Capacitors in the range of 0.1uF is generally
adequate for most applications. The diodes must
be a fast recovery device 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 application, schottky diodes can be
used to minimize forward drop across the diodes
at start up.
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
IR3628
L
IR3624
D1
C1
Vc
HDrv
Q1
Q2
C2
VBUS
D2
C3
VBUS
IR3628
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3628MTRPBF | 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 |
| IR3629 | 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 |
| 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 |
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