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| 型号： | IR3843WMTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 15QFN |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 特色产品： | Gen2.1 SupIRBuck? Integrated Voltage Regulators |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 14.4 V |
| 输入电压： | 1.5 V ~ 16 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 225kHz ~ 1.65MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 15-PowerVQFN |
| 包装： | 标准包装 |
| 供应商设备封装： | PQFN（5x6） |
| 其它名称： | IR3843WMTR1PBFDKR |
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PD-97507
IR3843WMPbF
Application Information
Design Example:
when an external resistor divider is connected to
the output as shown in figure 11.
Equation (7) can be rewritten as:
R 9 = R 8 ? ? ?
? .......... .......... .......... .... (8)
?
The following example is a typical application for
IR3843W. 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
I o = 2 A
For the calculated values of R8
feedback compensation section.
V OU T
and R9 see
Δ V o ≤ 54mV
F s = 600 kHz
Enabling the IR3843W
As explained earlier, the precise threshold of
IR3624
IR3843W
Fb
R 8
R 9
the Enable lends itself well to implementation of
a UVLO for the Bus Voltage.
V in
Fig. 11. Typical application of the IR3843W for
programming the output voltage
Soft-Start Programming
The soft-start timing can be programmed by
IR3843W
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 =49.9K and R 2 =7.5K 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 ?
Rev 13.0
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), as shown in
Fig. 12.. 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,
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3843WMTRPBF | 功能描述:直流/直流开关调节器 2A SupIRBuck Reg 250-1500kHz, 1.5-16V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| IR3846 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Single-Input Voltage, Synchronous Buck Regulator |
| IR3846MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:Single-Input Voltage, Synchronous Buck Regulator |
| IR3847 | 制造商:IRF 制造商全称:International Rectifier 功能描述:Single-Input Voltage, Synchronous Buck Regulator 25A Highly Integrated SupIRBuck |
| IR3847MTR1PBF | 功能描述:直流/直流开关调节器 25A Single 1.5MHz 5V to 21V App w/PWM RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.6 V to 0.86 V 输出电流: 输出端数量:1 最大工作温度:+ 150 C 安装风格:SMD/SMT 封装 / 箱体:PQFN 5 x 6 |
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