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| 型号： | IR3623MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32MLPQ |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1.2MHz |
| 占空比： | 85% |
| 电源电压： | 8.5 V ~ 14.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | IR3623MTRPBFDKR |
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IR3623MPbF
Application Information
Design Example:
The following example is a typical application for
IR3623. The application circuit is shown in
page25.
V in ? 12 V , ( 13 . 2 V , max)
V o ? 1 . 8 V
I o ? 40 A
? V o ? 30 mV
F s ? 600 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 0.8V. The divider is
ratioed to provide 0.8V 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 ? A * T start - - - - ( 11 )
Where T start is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.1uF. Choose a ceramic
capacitor at 0.1uF.
Input Capacitor Selection
The 180 o out of phase will reduce the RMS value
of the ripple current seen by input capacitors.
This reduces numbers of input capacitors. The
input capacitors must be selected that can
handle both the maximum ripple RMS at highest
ambient temperature as well as the maximum
input voltage. The RMS value of current ripple for
duty cycle under 50% is expressed by:
V o ? V REF ? ? ? 1 ?
R 6 ?
R 5 ? ?
?
?
?
- - - - ( 9 )
2
I RMS ? ? I 1 D 1 ? 1 ? D 1 ? ? I 2 D 2 ? 1 ? D 2 ? ? 2 I 1 I 2 D 1 D 2
?
- - ( 12 )
When an external resistor divider is connected to
the output as shown in figure 17.
V OU T
Where:
-I RMS is the RMS value of the input capacitor
current
-D 1 and D 2 are the duty cycle for each channel
IR3623
R 6
-I 1 and I 2 are the output current for each channel
Fb1
R 5
Fig. 17: Typical application of the IR3623 for
programming the output voltage
Equation (9) can be rewritten as:
For Io=40A and D=0.13, the I RMS = 17.8A.
Ceramic capacitors are recommended due to
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
enhance better efficiency,
Use 15x22uF, 16V ceramic capacitor from TDK
(C3225X5R1C226M).
For the single output application when the duty
cycle is larger than 50% the following equation
R 5 ? R 6 ? ? ?
? ?
? V ref
? V o ? V ref
?
?
- - - - ( 10 )
can be used to calculate the total RMS value
input capacitor current:
For the calculated values of R 5 and R 6 see
feedback compensation section.
I RMS ? I O ? 2 D ? 1 ? D ? ? ? 2 ? 2 D ? ?
D ? 0.5
www.irf.com
January 28, 2013
18
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相关代理商/技术参数 |
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| IR3624MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 10-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3624MTRPBF | 功能描述:开关变换器、稳压器与控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3628MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| 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 |
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