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参数资料
| 型号： | IP1206PBF |
| 厂商： | International Rectifier |
| 文件页数： | 13/30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
Soft-Start (cont.)
3 V
During power up, the converter output starts at
zero and thus the voltage at Fb is about 0V. A
current (64μA) injects into the Fb pin and
generates a voltage about 1.6V (64μAx25K)
across the negative input of error amplifier, see
Fig. 10.
The magnitude of this current is inversely
proportional to the voltage at the soft-start pin.
The 28μA current source starts to charge up the
external capacitor. In the mean time, the soft-
start voltage ramps up, the current flowing into
Fb pin starts to decrease linearly and so does the
voltage at negative input of error amplifier.
When the soft-start capacitor is around 1V, the
voltage at the negative input of the error amplifier
is approximately 0.8V.
As the soft-start capacitor voltage charges up,
the current flowing into the Fb pin keeps
decreasing.
The feedback voltage increases linearly as the
injecting current decreases. The injecting current
drops to zero when soft-start voltage is around
1.8V and the output voltage goes into steady
state. Fig. 11 shows the theoretical operational
waveforms during soft-start.
The output start-up time is the time period when
soft-start capacitor voltage increases from 1V to
2V. The start-up time will be dependent on the
SS1/SD1
Seq
Fb1
VP1
SS2/SD2
Fb2
VP2
Track
64uA
POR
64uA
POR
I SS1 = 28uA
I hiccup1 = 3uA
E/A1
3 V
I SS2 = 28uA
OCP2
I hiccup2 = 3uA
E/A2
OCP1
size of the external soft-start capacitor. The start-
up time can be estimated by:
Fig. 10: Soft-Start circuit for iP1206
28 μ A ?
T start
C ss
= 1 . 8 V ? 1 V
Output of POR
3V
? 1.8V
For a given start up time, the soft-start capacitor
(nF) can be estimated as:
Soft-Start
Voltage
0V
? 1V
C SS
?
20 ( μ A ) * T start ( ms )
0 . 8 ( V )
- - - - ( 5 )
64uA
Current flowing
into Fb pin
Voltage at negative input ? 1.6V
0uA
For normal start up the Seq pin should be pulled
high (usually can be connected to Vout3).
of Error Amp
Voltage at Fb pin
0V
0.8V
0.8V
Fig. 11: Theoretical operation waveforms
during soft-start
www.irf.com
2/26/2008
13
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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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