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参数资料
| 型号： | IRDC3842 |
| 厂商： | International Rectifier |
| 文件页数： | 17/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SYNC BUCK CONVERTER |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 4A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3842 |
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IR3842MPbF
Application Information
Design Example:
when an external resistor divider is connected to
the output as shown in figure 11.
Equation (5) can be rewritten as:
R 9 = R 8 ? ? ?
? .......... .......... .......... .... (8)
?
The following example is a typical application for
IR3842. The application circuit is shown on page
23.
? V ref
? V o ? V ref
?
?
V in = 12 V ( 13.2V max)
V o = 1.8 V
For the calculated values of R8
feedback compensation section.
and R9 see
I o = 4 A
Δ V o ≤ 54mV
F s = 600 kHz
Enabling the IR3842
IR3842
IR3624
Fb
V OU T
R 8
R 9
As explained earlier, the precise threshold of
the Enable lends itself well to implementation of
a UVLO for the Bus Voltage.
V in
Fig. 11. Typical application of the IR3842 for
programming the output voltage
Soft-Start Programming
The soft-start timing can be programmed by
IR3842
Enable
R 1
R 2
selecting the soft-start capacitance value. From
(1), for a desired start-up time of the converter,
the soft start capacitor can be calculated by
using:
C SS ( μ F ) = T start ( ms ) × 0.02857 .......... (9)
= V EN = 1.2 .......... (5)
V in (min) *
R 2 = R 1
V EN
V o = V ref ? ? ? 1 + 8 ? ? .......... .......... .......... .....(7)
For a typical Enable threshold of V EN = 1.2 V
R 2
R 1 + R 2
.......... (6)
V in( min ) ? V EN
For a V in (min) =10.2V, R 1 =4.99K and R 2 =750 ohm
is a good choice.
Programming the frequency
For F s = 600 kHz, select R t = 23.7 k ? , using
Table. 1.
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 0.7V. The divider is
ratioed to provide 0.7V at the Fb pin when the
output is at its desired value. The output voltage
is defined by using the following equation:
? R ?
? R 9 ?
06/18/09
Where T start is the desired start-up time (ms).
For a start-up time of 3.5ms, the soft-start
capacitor will be 0.099 μ F. Choose a 0.1 μ F
ceramic capacitor.
Bootstrap Capacitor Selection
To drive the Control FET, it is necessary to
supply a gate voltage at least 4V greater than
the voltage at the SW pin, which is connected
the source of the Control FET . This is achieved
by using a bootstrap configuration, which
comprises the internal bootstrap diode and an
external bootstrap capacitor (C6). The operation
of the circuit is as follows: When the lower
MOSFET is turned on, the capacitor node
connected to SW is pulled down to ground. The
capacitor charges towards V cc through the
internal bootstrap diode, which has a forward
voltage drop V D . The voltage V c across the
bootstrap capacitor C6 is approximately given as
V c ? V cc ? V D .......... .......... ...... (10)
When the upper MOSFET turns on in the next
cycle, the capacitor node connected to SW rises
to the bus voltage V in . However, if the value of
C6 is appropriately chosen,
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3842A | 功能描述:电源管理IC开发工具 IR3842A SYNC CONV 300kHz EVAL BRD 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 |
| IRDC3842W | 功能描述:电源管理IC开发工具 User Guide IR3842W Eval Brd 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 |
| IRDC3843 | 制造商:International Rectifier 功能描述:BOARD EVALUATION IR3843 |
| IRDC3843A | 功能描述:电源管理IC开发工具 IR3843 SYNC CONV 600kHz EVAL BRD 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 |
| IRDC3843W | 功能描述:电源管理IC开发工具 User Guide IR3843W Eval Brd 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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