- 您现在的位置：买卖IC网 > PDF目录20504 > IRDC3856 (International Rectifier)BOARD EVAL FOR IR3856 PDF资料下载
参数资料
| 型号： | IRDC3856 |
| 厂商： | International Rectifier |
| 文件页数： | 13/35页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR IR3856 |
| 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： | 0 ~ 6A |
| 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： | IR3856 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页当前第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
PD-97528
IR3856MPbF
Figure 3c. shows the recommended startup
sequence for sequenced operation of IR3856
with Enable used as logic input.
Fig. 5. Pre-Bias startup pulses
Soft-Start
The IR3856 has a programmable soft-start to
control the output voltage rise and to limit the
current surge at the start-up. To ensure correct
start-up, the soft-start sequence initiates when
the Enable and Vcc rise above their UVLO
thresholds and generate the Power On Ready
( 1.4 - 0.7 ) * C SS
T start = - - - - - - - - - - - - - - - - - - - - (1)
Fig. 3c. Recommended startup sequence,
Sequenced operation
Pre-Bias Startup
IR3856 is able to start up into pre-charged
output, which prevents oscillation and
disturbances of the output voltage.
The output starts in asynchronous fashion and
keeps the synchronous MOSFET off until the first
gate signal for control MOSFET is generated.
(POR) signal. The internal current source
(typically 20uA) charges the external capacitor
C ss linearly from 0V to 3V. Figure 6 shows the
waveforms during the soft start.
The start up time can be estimated by:
20 μ A
During the soft start the OCP is enabled to
protect the device for any short circuit and over
current condition.
Figure 4 shows a typical Pre-Bias condition at
start up.
The synchronous MOSFET always starts with a
narrow pulse width and gradually increases its
duty cycle with a step of 25%, 50%, 75% and
100% until it reaches the steady state value. The
number of these startup pulses for the
synchronous MOSFET is internally programmed.
Figure 5 shows a series of 32, 16, 8 startup
pulses.
Fig. 6. Theoretical operation waveforms
during soft-start
Fig. 4. Pre-Bias startup
Rev 4.0
13
相关PDF资料 |
PDF描述 |
|---|---|
| IRDC3839 | KIT EVAL REG 6A SUPIRBUCK DC/DC |
| RCM06DTMH | CONN EDGECARD 12POS R/A .156 SLD |
| SBRB2545CTT4G | DIODE SCHOTTKY 45V 15A D2PAK |
| VI-23X-CX-S | CONVERTER MOD DC/DC 5.2V 75W |
| TC1427CUA | IC MOSFET DVR 1.2A DUAL HS 8MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3856 - SUPIRBUCK | 制造商:International Rectifier 功能描述:INTERNATIONAL RECIFIER - GEN 2.1 SUPIRBUCK FAMILY - Bulk |
| IRDC3856 | 制造商:International Rectifier 功能描述:; MCU Supported Families:IR3856; Feature |
| IRDC3856W | 功能描述:电源管理IC开发工具 User Guide IR3856W 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 |
| IRDC3859 | 功能描述:电源管理IC开发工具 User Guide IR3859 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 |
| IRDC3859 - SUPIRBUCK | 制造商:International Rectifier 功能描述:INTERNATIONAL RECIFIER - GEN 2.1 SUPIRBUCK FAMILY - Bulk |
发布紧急采购，3分钟左右您将得到回复。