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| 型号： | IP1201PBF |
| 厂商： | International Rectifier |
| 文件页数： | 14/29页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 30A 198BGA |
| 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 ~ 3.3 V |
| 输入电压： | 3.14 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 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（159 凸块） |
| 包装： | 散装 |
| 供应商设备封装： | BGA（15.5x9.25） |
| 配用： | IRDCIP1201-A-ND - BUCK CONV REF DESIGN KIT IP1201 |
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iP1201PbF
Mode of Operation
The iP1201PbF can be configured to provide either two
independent dual outputs or single paralleled output with
current share. In dual output mode, the two error am-
plifiers of the PWM controller operate independently.
Each output voltage of the iP1201PbF block is con-
trolled by its own error amplifier. The output of the error
amplifier and the internally generated ramp signal are
compared to produce PWM pulses of fixed frequency
that drive the internal power switches. In this mode,
the VP-ref pin must be connected to Vref pin. Vref pin is
the internally generated 0.8V reference input of first er-
ror amplifier . Refer to the internal block diagram of the
iP1201PbF in Fig.1.
In single output mode, one error amplifier controls the
output voltage and the other amplifier monitors the in-
ductor current information for current sharing. In this
mode, VP-ref pin must be disconnected from Vref pin
and connected to the output of the inductor. See Fig.
17. The inductor current information is provided
through external shunts placed in series with the out-
put inductors.
A lossless inductor current sensing scheme can also
be implemented as shown in Fig. 18 where the cur-
rent is sensed throughthe DC resistance of the induc-
tor. In this case R L and C L are selected such that R L x
C L = L / R dc . Set R L = 1K and solve for C L . R dc is the
internal DC resistance of inductor L.
In single output mode, the iP1202 does not require a
soft start capacitor at SS2 pin.
The iP1201 PbF can also be configured in dual output
tracking mode where the second output tracks the
first output.
For a specific output configuration, follow the con-
nection diagram shown in Fig.16, Fig.17 and Fig.18
at the end of this section .
Out of Phase Operation
The dual output PWM controller inside the iP1201 PbF
provides a 180° out of phase operation of the PWM
outputs. This method of control offers the advan-
tage of reducing the amount of input bypass ca-
pacitors due to increase in input ripple frequency
and hence reduction of ripple amplitude. Moreover,
for paralleled output configurations 180° phase
shifting contributes to smaller output capacitors due
to output inductor ripple current cancellation and
ripple reduction.
14
Frequency and Synchronization
The operating switching frequency (f SW ) range of
iP1201 PbF is 200 kHz to 400 kHz. The desired fre-
quency is set by placing an external resistor to the RT
pin of the iP1201 PbF . See Fig. 11 for the proper resis-
tor value.
The iP1201PbF is capable of accepting an external
digital synchronization signal. Synchronization will be
enabled by the rising edge clock. The free running
oscillator frequency is twice the per-channel fre-
quency. During synchronization, RT is selected such
that the free running frequency is 20% below the syn-
chronization frequency. The maximum synchroniza-
tion frequency that iP1201PbF can accept is 800kHz.
Note that the actual free running frequency of individual
output is half the synchronization frequency. Synchro-
nization capability is provided both in independent and
parallel configurations. When unused, the SYNC pin
must be left floating.
Overcurrent Protection/Autorestart
The Overcurrent Protection function of the iP1201PbF
offers two distinct modes: HICCUP of the output and
Overcurrent Shutdown. If the Hiccup pin is pulled high
(Hiccup enabled), hiccup mode will be selected. If Hic-
cup pin is pulled low (Hiccup dis- abled), overcurrent
shutdown will be selected.
During overloads, in HICCUP disabled mode, the
controller shuts down as soon as the trip threshold
is reached. In HICCUP enabled mode, when
overcurrent trip threshold is reached, the power
supply output shuts down and attempts to restart.
The time duration between the shutdown of the
output and the restart is determined by the time it
takes to discharge the soft start capacitor. Typically,
the discharge time of the soft start capacitor is 10
times the charge time. The duty cycle of the hiccup
process is typically 5%.The output will stay in hic-
cup indefinitely until the overload is removed. The
typical overcurrent trip threshold of the device is
internally set at 20A.
Overvoltage Protection (OVP)
Overvoltage is sensed through separate output volt-
age sense pins FB1s and FB2s. A separate OVP cir-
cuit is provided for each output and the OVP thresh-
old is set to 115% of the output voltage. Upon over-
voltage condition of either one of the outputs, the OVP
forces a latched shutdown on both outputs.
www.irf.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IP1201TR | 功能描述:开关变换器、稳压器与控制器 DUAL OUTPUT 2-Phase 3.14 to 5V 400kHz 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 |
| IP1201TRPBF | 功能描述:开关变换器、稳压器与控制器 DUAL OUTPUT 2-Phase 3.14 to 5V 400kHz 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 |
| IP1202 | 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 |
| IP1202PBF | 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 |
| IP1202PBF-EL | 制造商:International Rectifier 功能描述: |
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