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参数资料
| 型号： | IP1202PBF |
| 厂商： | International Rectifier |
| 文件页数： | 16/29页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 30A 198BG |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 10 |
| 系列： | iPOWIR™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 5.5 V ~ 13.2 V |
| 频率 - 开关： | 200kHz ~ 400kHz |
| 电流 - 输出： | 30A |
| 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： | 198-BGA（161 凸块） |
| 包装： | 管件 |
| 供应商设备封装： | BGA（15.5x9.25） |
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iP1202PbF
iP1202PbF Design Procedure
Only a few external components are required to com-
plete a dual output synchronous buck power supply
using iP1202PbF. The following procedure will guide
the designer through the design and selection pro-
cess of these external components.
A typical application for iP1202PbF will be:
V IN = 12V, V OUT1 = 1.5V, I OUT1 = 15A, V OUT2 = 2.5V, I OUT2
= 10A, f sw = 300kHz, V p-p1 = V p-p2 = 50mV
Setting the Output Voltage
The output voltage of the iP1202PbF is set by the
0.8V reference Vref and external voltage dividers.
Vout1
R9
FB1
R7
iP1202PbF
R13
ence source to VP-ref. In this case, to ensure proper
start-up, power to VP-ref and iP1202PbF must be
applied simultaneuosly.
Setting the Overvoltage Trip
Both outputs of the iP1202PbF will shut down if ei-
ther one of the outputs experiences a voltage in the
range of 115% of V OUT . The overvoltage sense pins
FB1s and FB2s are connected to the output through
voltage dividers, R 13 and R 14 (Fig. 17), and the trip
setpoints are programmed according to equation (1).
Separate overvoltage sense pins FB1 s and FB2 s are
provided to protect the power supply output if for some
reason the main feedback loop is lost (for instance,
loss of feedback resistors). An optional 100pF ca-
pacitor (C26) is used for delay and filtering purposes.
If this redundancy is not required and if Type II con-
trol loop compensation scheme is utilized, FB1s and
FB2s pins can be connected to FB1 and FB2 pins
respectively.
In parallel configuration, FB2s should be connected
to FB1s
Setting the Soft-Start Capacitor
FB1S
C26
(Optional)
R14
The soft start capacitor C ss is selected according to
equation (2):
t ss = 40 x C ss (2)
Fig. 17: Typical scheme for output voltage setting
For Type II compensation,
V OUT1 is set according to equation (1):
where,
t ss is the output voltage ramp time in milliseconds,
and C ss is the soft start capacitor in μ F.
A 0.1 μ F capacitor will provide an output voltage ramp-
up time of about 4ms.
V OUT1 = V ref x (1 + R 9 /R 7 ) (see Fig. 17)
(1)
Input Capacitor Selection
( ) (3)
=
I D ( 1 ? D ) + I D ( 1 ? D ) ? 2 I I D D
I
Setting R 7 to 1K, V OUT1 to 1.5V and Vref to 0.8V, will
result in R 9 = 875 ohms (select 887 ohms). Final val-
ues can be selected according to the desired accu-
racy of the output.
To set the output voltage for Type III compensation,
refer to equation (25) in Type III compensation sec-
tion.
If the 0.8V reference is used to set the voltage for the
second output V OUT2 , VP-ref pin must be shorted to
Vref pin and in a similar way, voltage divider resistors
are selected for the second output V OUT2 . The second
output can also be set by applying an external refer-
16
The switching currents impose RMS current require-
ments on the input capacitors. The expression in
equation (3) allows the selection of the input capaci-
tors for duty cycles less than 0.5:
2 2
RMS 1 1 1 2 2 2 1 2 1 2
where, I 1 and I 2 are the load currents for outputs 1
and 2 respectively and D 1 and D 2 are the duty cycles
for channel 1 and channel 2 respectively.
For output1 of the above example D= 0.13 and,
For output2 of the above example D = 0.21 and,
For the above example, using equation (3) the ca-
pacitor rms current yields 5.8A.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IP1202PBF-EL | 制造商:International Rectifier 功能描述: |
| IP1202TR | 功能描述:开关变换器、稳压器与控制器 DUAL OUTPUT 2-Phase 5.5V to 13.2V 15A 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 |
| IP1202TRPBF | 功能描述:开关变换器、稳压器与控制器 DUAL OUTPUT 2-Phase 5.5V to 13.2V 15A 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 |
| IP1203 | 功能描述:开关变换器、稳压器与控制器 1 OUTPUT FULL FCTN SYNC BUCK PWR BLOCK 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 |
| IP1203PBF | 功能描述:开关变换器、稳压器与控制器 1 OUTPUT FULL FCTN SYNC BUCK PWR BLOCK 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 |
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