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参数资料
| 型号： | IRDC3842W |
| 厂商： | International Rectifier |
| 文件页数： | 15/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR IR3842W 4A CONV |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 4A |
| 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： | IR3842W |
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PD-97659
IR3842WMPbF
Thermal Shutdown
Temperature sensing is provided inside
IR3842W. The trip threshold is typically set to
1.5V <Vin<16V
4.5V <Vcc<5.5V
140 o C. When trip threshold is exceeded, thermal
shutdown turns off both MOSFETs and
discharges the soft start capacitor.
Automatic restart is initiated when the sensed
temperature drops within the operating range.
PGood
Vcc
PGood
Seq
Rt
Enable
Vin
Boot
SW
OCSet
Fb
RA
RB
Vo(master)
There is a 20 o C hysteresis in the thermal
shutdown threshold.
SS/ SD
Gnd
PGnd
Comp
Output Voltage Sequencing
The IR3842W can accommodate user
programmable sequencing using Seq, Enable
1.5V <Vin<16V
4.5V <Vcc<5.5V
and Power Good pins.
Enable
Vin
Boot
Vo(master)
Vcc
SW
Vo(slave)
PGood
Vo1
RE
PGood
OCSet
RC
Seq
Fb
Vo2
RF
Rt
RD
SS/ SD
Gnd
PGnd
Comp
Simultaneous Powerup
Fig. 8b. Application Circuit for Simultaneous
Fig. 8a. Simultaneous Power-up of the slave
Sequencing
with respect to the master.
Power Good Output
Through these pins, voltage sequencing such as
simultaneous and sequential can be
implemented. Figure 8. shows simultaneous
sequencing configurations. In simultaneous
power-up, the voltage at the Seq pin of the slave
reaches 0.7V before the Fb pin of the master. For
R E /R F =R C /R D , therefore, the output voltage of
the slave follows that of the master until the
voltage at the Seq pin of the slave reaches 0.7 V.
After the voltage at the Seq pin of the slave
exceeds 0.85V, the internal 0.7V reference of
the slave dictates its output voltage.
It is recommended that irrespective of the
sequencing configuration used, the input voltage
should be allowed to come up to its nominal
value first, followed by V cc and Enable, before the
sequencing signal is applied.
For non-sequenced operation, the Seq pin
should be tied to a voltage greater than 0.85V,
such as 3.3V or V cc . Again, the input voltage
should be allowed to come up before V cc and
Enable.
Rev 13.0
The IC continually monitors the output voltage via
Feedback (Fb pin). The feedback voltage forms
an input to a window comparator whose upper
and lower thresholds are 0.805V and 0.595V
respectively. Hence, the Power Good signal is
flagged when the Fb pin voltage is within the
PGood window, i. e., between 0.595V to 0.805V,
as shown in Fig .9 The PGood pin is open drain
and it needs to be externally pulled high. High
state indicates that output is in regulation. Fig. 9a
shows the PGood timing diagram for non-
tracking operation. In this case, during startup,
PGood goes high after the SS voltage reaches
2.1V if the Fb voltage is within the PGood
comparator window. Fig. 9a. and Fig 9.b. also
show a 256 cycle delay between the Fb voltage
entering within the thresholds defined by the
PGood window and PGood going high.
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3843 | 制造商:International Rectifier 功能描述:BOARD EVALUATION IR3843 |
| IRDC3843A | 功能描述:电源管理IC开发工具 IR3843 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 |
| IRDC3843W | 功能描述:电源管理IC开发工具 User Guide IR3843W 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 |
| IRDC3853 | 功能描述:电源管理IC开发工具 User Guide IR3853 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 |
| IRDC3853 - SUPIRBUCK | 制造商:International Rectifier 功能描述:INTERNATIONAL RECIFIER - GEN 2.1 SUPIRBUCK FAMILY - Bulk |
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