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参数资料
| 型号： | IRDC3837 |
| 厂商： | International Rectifier |
| 文件页数： | 17/36页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL REG 14A SUPIRBUCK DC/DC |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 14A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3837 |
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IR3837MPbF
Therefore, in normal operating condition, after
Enable goes high the SS ramps up the output
voltage until Vfb (voltage of feedback/Fb pin)
reaches about 0.6V. Then Vref takes over and
the output voltage is regulated (refer to Fig. 11).
Tracking-mode operation is achieved by
connecting Vref to Vcc (1.5V<Vref<Vcc). Then,
while Vp=0, Enable is taken above its threshold
so that the soft start circuit generates internal SS
signal. After the internal SS signal reaches the
final value (refer to Fig. 4c) ramping up the Vp
input will ramp up the output voltage. In tracking
mode, Vfb always follows Vp which means Vout
is always proportional to Vp voltage (typical for
DDR/Vtt rail applications)
In sequencing mode of operation (simultaneous
or ratiometric), Vref is left floating and Vp is kept
to ground level until after SS signal reaches the
final value. Then Vp is ramped up and Vfb
follows Vp. When Vp>0.6V the error-amplifier
Tracking and sequencing operations can be
implemented to be simultaneous or ratiometric
(refer to figures 9 and 10). Figure 8 shows typical
circuit configuration for sequencing operation.
With this power-up configuration, the voltage at
the Vp pin of the slave reaches 0.6V before the
Fb pin of the master. If R E /R F =R C /R D ,
simultaneous startup is achieved. That is, the
output voltage of the slave follows that of the
master until the voltage at the Vp pin of the slave
reaches 0.6 V. After the voltage at the Vp pin of
the slave exceeds 0.6V, the internal 0.6V
reference of the slave dictates its output voltage.
In reality the regulation gradually shifts from Vp
to internal Vref. The circuit shown in Fig. 8 can
also be used for simultaneous or ratiometric
tracking operation if Vref of the slave is
connected to Vcc. Table 2 on page 18
summarizes the required conditions to achieve
simultaneous / ratiometric tracking or sequencing
operations.
switches to Vref and the output voltage is
regulated with Vref.
Fig. 9 Typical waveforms for sequencing mode
of operation: (a) simultaneous, (b) ratiometric
Fig. 8. Application Circuit for Simultaneous
and ratiometric Sequencing
Rev 1.31
Fig. 10 Typical waveforms in tracking mode of
operation: (a) simultaneous, (b) ratiometric
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3837 | 制造商:International Rectifier 功能描述:; MCU Supported Families:IR3837; Feature |
| IRDC3838 | 功能描述:电源管理IC开发工具 User Guide IR3838 Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3838 | 制造商:International Rectifier 功能描述:; MCU Supported Families:IR3838; Feature |
| IRDC3839 | 功能描述:电源管理IC开发工具 User Guide IR3839 Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3840 | 功能描述:电源管理IC开发工具 IR3840 SYNC CONV 600kHz EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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