参数资料
型号: IR3832WMTR1PBF
厂商: International Rectifier
文件页数: 13/32页
文件大小: 0K
描述: IC REG SYNC BUCK 4A DDR 15-QFN
特色产品: Gen2.1 SupIRBuck? Integrated Voltage Regulators
标准包装: 1
系列: SupIRBuck™
应用: 转换器,DDR
输入电压: 1.5 V ~ 16 V
输出数: 1
输出电压: 0.6 V ~ 14.4 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 15-PowerVQFN
供应商设备封装: PQFN(5x6)
包装: 标准包装
其它名称: IR3832WMTR1PBFDKR
PD-97508
IR3832WMPbF
Figure 3c. shows the recommended startup
sequence for tracking operation of IR3832W with
Enable used as logic input.
Fig. 5. Pre-Bias startup pulses
Soft-Start
The IR3832W has a programmable soft-start to
control the output voltage rise and 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
(POR) signal. The internal current source
Fig. 3c. Recommended startup sequence,
Sequenced operation
Pre-Bias Startup
(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:
IR3832W is able to start up into pre-charged
output, which prevents oscillation and
disturbances of the output voltage.
T start =
V p * C SS
20 μ A
- - - - - - - - - - - - - - - - - - - - (1)
The output starts in asynchronous fashion and
keeps the synchronous MOSFET off until the first
gate signal for control MOSFET is generated.
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 6.0
13
相关PDF资料
PDF描述
GBA43DTKH CONN EDGECARD 86POS DIP .125 SLD
VI-JTZ-CY-S CONVERTER MOD DC/DC 2V 20W
25ZLJ3300M16X25 CAP ALUM 3300UF 25V 20% RADIAL
VE-J3V-EX-F1 CONVERTER MOD DC/DC 5.8V 75W
GBA43DTKD CONN EDGECARD 86POS DIP .125 SLD
相关代理商/技术参数
参数描述
IR3832WMTRPBF 功能描述:直流/直流开关调节器 4A SupIRBuck Reg 250-1500kHz, 1.5-16V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
IR3837MPBF 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY INTEGRATED 14A SINGLE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR
IR3837MTR1PBF 功能描述:直流/直流开关调节器 14A SupIRBuck Reg 250-1500kHz, 1.5-16V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
IR3837MTR1PBF 制造商:International Rectifier 功能描述:IC DC-DC CONV 1.5 MHz QFN-17 制造商:International Rectifier 功能描述:IC, DC-DC CONV, 1.5 MHz, QFN-17
IR3837MTR1PBF-CUT TAPE 制造商:IR 功能描述:IR3837 Series 1.5 MHz 14 A Surface Mount Synchronous Buck Regulator - QFN-16