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| 型号： | IR3837MTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 15/36页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 14A PQFN17 |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 14.4 V |
| 输入电压： | 1.5 V ~ 16 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 225kHz ~ 1.65MHz |
| 电流 - 输出： | 14A |
| 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： | 17-VQFN |
| 包装： | 标准包装 |
| 供应商设备封装： | 17-PQFN（5x6） |
| 其它名称： | IR3837MTR1PBFDKR |
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IR3837MPbF
Soft-Start
The IR3837 has a digital internal soft-start to
Table 1. Switching Frequency and I OCSet vs.
External Resistor ( R t )
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
(POR) signal. The internal SS signal linearly
rises with the rate of 0.2mV / μs from 0V to 2V.
Figure 6 shows the waveforms during soft start
(also refer to figure 11). The normal start up time
is fixed, and is equal to:
R t (k ? )
47.5
35.7
28.7
23.7
20.5
17.8
15.8
F s (kHz)
300
400
500
600
700
800
900
I ocset ( μ A)
14.7
19.6
24.35
29.54
34.1
39.3
44.3
T start ?
? 1.3V - 0.7V ? ? 3ms
0.2mV/ ? s
- - - - - - - - - - - - - - (1)
14.3
12.7
1000
1100
48.95
55.1
During the soft start the OCP is enabled to
protect the device for any short circuit and over
current condition.
11.5
10.7
9.76
9.31
1200
1300
1400
1500
60.85
65.4
71.7
75.15
Over-Current Protection
The over current protection is performed by
sensing current through the R DS(on) of the sync
FET. This method enhances the converter’s
efficiency and reduces cost by eliminating a
current sense resistor. As shown in figure 7, an
external resistor (R OCSet ) is connected between
OCSet pin and the switch node (SW) which sets
the current limit set point.
An internal current source sources current
( IOCSet ) out of the OCSet pin. This current is a
function of Rt and hence, of the free-running
switching frequency.
I OCSet ( μ A) ?
700
R t (k ? )
.......... .......... .......... .....(2)
Fig. 6. Theoretical operation waveforms
during soft-start (non tracking / non sequencing)
Operating Frequency
The switching frequency can be programmed
between 250kHz – 1500kHz by connecting an
external resistor from R t pin to Gnd. Table 1
tabulates the oscillator frequency versus R t .
Shutdown
The IR3837 can be shutdown by pulling the
Enable pin below its 0.85 V threshold. This will
tri-state both, the high side driver as well as the
low side driver.
Rev 1.31
Table 1. shows IOCSet at different switching
frequencies. The internal current source
develops a voltage across R OCSet . When the sync
FET is turned on, the inductor current flows
through Q2 and results in a voltage at OCSet
which is given by:
V OCSet ? ( I OCSet ? R OCSet ) ? ( R DS (on ) ? I L ) .......... .(3)
An over current is detected if the OCSet pin goes
below ground. However, to avoid false tripping ,
due to the noise generated when the sync FET is
turned on, the OCP comparator is enabled about
200ns after sync-FET is turned on .
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| IR3837MTRPBF | 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 |
| IR3838MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY INTEGRATED 10A SINGLE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR |
| IR3838MTR1PBF | 功能描述:直流/直流开关调节器 10A 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 |
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