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参数资料
| 型号： | IRDC3629 |
| 厂商： | International Rectifier |
| 文件页数： | 11/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SYNC BUCK CONTROLLER |
| 标准包装： | 1 |
| 系列： | * |
IR3629/IR3629A MPbF
Application Information
Design Example:
The following example is a typical application for
IR3629A. The application circuit is shown on
page 18.
V in = 12 V,( 13 . 2 V, max )
V o = 1 . 8 V
I o = 25 A
Δ V o ≤ 54 mV(output voltage ri pple)
F s = 300 kHz
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:
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:
C SS ? 20 μ A * T start --( 1 )
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
V o = V ref ? ? ? 1 + 8 ? ?
? R ?
? R 9 ?
--( 4 )
will be added to this voltage when the upper
MOSFET turns on in the next cycle, and
providing supply voltage (Vc) through diode (D2).
When an external resistor divider is connected to
Vc is approximately:
the output as shown in figure 10.
V C ? 2 ? V bus ? ( V D 1 + V D 2 )
--( 6 )
IR3624
IR3629A
Fb
V OU T
R 8
R 9
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
Fig. 10: Typical application of the IR3629A for
programming the output voltage
used to minimize forward drop.
Equation (4) can be rewritten as:
V BUS
C3
D1
D2
R 9 = R 8 ? ? ?
? ?
? V ref
? V O ? V ref
?
?
--( 5 )
Vc
C2
C1
V BU S
Q1
L
For the calculated values of R 8 and R 9 see
feedback compensation section.
IR3624
IR3629/29A
HDrv
Q2
Fig. 11: Charge pump circuit to generate
Vc voltage
11/29/2007
11
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相关代理商/技术参数 |
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| IRDC3629A | 功能描述:电源管理IC开发工具 IR3629A Eval BRD 300kHz Controller RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3637 | 功能描述:电源管理IC开发工具 250kHz to 9MHz IR350B Xphase IC RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3637EVAL | 制造商:IRF 制造商全称:International Rectifier 功能描述:IR3637 EVALUATION BOARD USER GUIDE |
| IRDC3640 | 功能描述:电源管理IC开发工具 IR3640 12V PWM 1.5MHz Controller RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3651 | 功能描述:电源管理IC开发工具 IR3651 EVAL BRD 400kHz RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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