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参数资料
| 型号： | IP1206PBF |
| 厂商： | International Rectifier |
| 文件页数： | 18/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 30A/15A LGA |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 5 |
| 系列： | iPOWIR™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 或 2 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 7.5 V ~ 14.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 600kHz |
| 电流 - 输出： | 30A，15A |
| 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： | 36-BFLGA |
| 包装： | 管件 |
| 供应商设备封装： | 36-LGA（9.25x15.5） |
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i P1206PbF
Application Information
Design Example:
The following example is a typical application for
iP1206. The application circuit is shown in
page25.
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
V in = 12 V , ( 13 . 2 V , max)
V o = 1 . 2 V
by using:
C SS ? 20 μ A * T start
- - - - ( 8 )
I o = 30 A
Δ V o ≤ 30 mV
F s = 300 kHz
Output Voltage Programming
Output voltage is programmed by the reference
voltage and an external voltage divider. The Fb
pin is the inverting input of the error amplifier,
which is internally referenced to 0.8V. The divider
ratio is chosen 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:
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 feature will reduce the
RMS value of the ripple current seen by input
capacitors. This reduces numbers of input
capacitors. The input capacitors selected must
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 + 6 ? ?
( I D ( 1 ? D ) + I D ( 1 ? D ) ? 2 I I D D )
? R ?
? R 5 ?
- - - - ( 6 )
I RMS =
2 2
1 1 1 2 2 2 1 2 1 2
- - - - ( 9 )
When an external resistor divider is connected to
the output as shown in Fig. 19.
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
iP1206
Fb1
R 6
R 5
-I 1 and I 2 are the output current for each channel
For Io=30A and D=0.10, the I RMS = 12A.
Ceramic capacitors are recommended due to
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
R 5 6 ? ?
? V ref ?
? V ? V
?
Fig. 19: Typical application of the iP1206 for
programming the output voltage
Equation (6) can be rewritten as:
= R ? - - - - ( 7 )
? o ref ?
enhance better efficiency,
Use 8x22uF, 16V ceramic capacitor from TDK
(C3225X5R1C226M).
For the single output application when the duty
cycle is larger than 50% the following equation
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
2/26/2008
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IP1206TRPBF | 功能描述:开关变换器、稳压器与控制器 Multiphase LGA PWR 7.5V to 14.5V 600kHz 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 |
| IP120A | 制造商:SEME-LAB 制造商全称:Seme LAB 功能描述:1.5 AMP NEGATIVE VOLTAGE REGULATOR |
| IP120A-05 | 制造商:SEME-LAB 制造商全称:Seme LAB 功能描述:1.5 AMP NEGATIVE VOLTAGE REGULATOR |
| IP120A-12 | 制造商:SEME-LAB 制造商全称:Seme LAB 功能描述:1.5 AMP NEGATIVE VOLTAGE REGULATOR |
| IP120A-15 | 制造商:SEME-LAB 制造商全称:Seme LAB 功能描述:1.5 AMP NEGATIVE VOLTAGE REGULATOR |
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