- 您现在的位置：买卖IC网 > PDF目录14727 > IR3837MTR1PBF (International Rectifier)IC REG BUCK SYNC ADJ 14A PQFN17 PDF资料下载
参数资料
| 型号： | IR3837MTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 21/36页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 14A PQFN17 |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 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： | 0.6 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： | 14A |
| 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： | 17-VQFN |
| 包装： | 标准包装 |
| 供应商设备封装： | 17-PQFN（5x6） |
| 其它名称： | IR3837MTR1PBFDKR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
IR3837MPbF
Application Information
V o ? V ref ? ? ? 1 ? 8 ? ? .......... .......... .......... .....(8)
Design Example:
The following example is a typical application for
IR3837. The application circuit is shown on page
27.
V in = 12 V ( 13 . 2 V max)
? R ?
? R 9 ?
When an external resistor divider is connected to
the output as shown in figure 16.
Equation (8) can be rewritten as:
R 9 ? R 8 ? ?
? .......... .......... .......... .... (9)
?
V o = 1 . 8 V
I o = 14 A
Δ V o ≤ ? 2 % ? V o for 30 % load transient )
? V ref
?
? V o ? V ref
?
?
F s = 600 kHz
For the calculated values of R8
feedback compensation section.
and R9 see
Enabling the IR3837
As explained earlier, the precise threshold of
the Enable lends itself well to implementation of
a UVLO for the Bus Voltage as shown in figure
15.
IR3837
IR3624
Fb
V OU T
R 8
R 9
V in
IR3837
Enable
R 1
Fig. 16. Typical application of the IR3837 for
programming the output voltage
? V EN ? 1.2 .......... (6)
V in (min) *
R 2 ? R 1
V EN
R 2
Fig. 15. Using Enable pin for UVLO
implementation
For a typical Enable threshold of V EN = 1.2 V
R 2
R 1 ? R 2
.......... (7)
V in( min ) ? V EN
For a V in (min) =10.2V, R 1 =49.9K and R 2 =6.8k 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 0.6V. The divider ratio
is set 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:
Rev 1.31
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 to
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 sync FET 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
(figure 17), 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 control FET 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, the voltage V c across C6
remains approximately unchanged and the
voltage at the Boot pin becomes:
V Boot ? V in ? V cc ? V D .......... .......... .......... .......... (11)
21
相关PDF资料 |
PDF描述 |
|---|---|
| MAX810TEXR+T10 | IC RESET CIRC MPU SC70-3 |
| MAX803REXR+T10 | IC RESET CIRC MPU SC70-3 |
| MAX810ZEXR+T10 | IC RESET CIRC MPU SC70-3 |
| MAX809TEXR+T10 | IC RESET CIRC MPU SC70-3 |
| MAX803LEXR+T10 | IC RESET CIRC MPU SC70-3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3837MTR1PBF | 制造商:International Rectifier 功能描述:IC DC-DC CONV 1.5 MHz QFN-17 制造商:International Rectifier 功能描述:IC, DC-DC CONV, 1.5 MHz, QFN-17 |
| IR3837MTR1PBF-CUT TAPE | 制造商:IR 功能描述:IR3837 Series 1.5 MHz 14 A Surface Mount Synchronous Buck Regulator - QFN-16 |
| IR3837MTRPBF | 功能描述:直流/直流开关调节器 14A 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 |
| IR3838MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY INTEGRATED 10A SINGLE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR3838MTR1PBF | 功能描述:直流/直流开关调节器 10A 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 |
发布紧急采购，3分钟左右您将得到回复。