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参数资料
| 型号： | IR3837MTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 20/36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
Minimum on time Considerations
The minimum ON time is the shortest amount of
time for which the Control FET may be reliably
turned on, and this depends on the internal
timing delays. For the IR3837, the typical
minimum on-time is specified as 70 ns.
Any design or application using the IR3837 must
ensure operation with a pulse width that is higher
than this minimum on-time and preferably higher
than 150 ns. This is necessary for the circuit to
operate without jitter and pulse-skipping, which
can cause high inductor current ripple and high
output voltage ripple.
Maximum Duty Ratio Considerations
A fixed off-time of 300 ns maximum is specified
for the IR3837. This provides an upper limit on
the operating duty ratio at any given switching
frequency. Thus, the higher the switching
frequency, the lower is the maximum duty ratio at
which the IR3837 can operate. To allow some
margin, the maximum operating duty ratio in any
application using the IR3837 should still
accommodate about 500 ns off-time. Fig 14.
shows a plot of the maximum duty ratio v/s the
switching frequency, with 300 ns off-time.
t on ?
D
F s
?
V out
V in ? F s
95
90
85
In any application that uses the IR3837, the
following condition must be satisfied:
t on (min) ? t on
80
75
70
65
60
? t on (min) ?
? V in ? F s ?
V out
V in ? F s
V out
t on (min)
The minimum output voltage is limited by the
reference voltage and hence V out(min) = 0.6 V.
Therefore, for V out(min) = 0.6 V,
V out (min)
? V in ? F s ?
t on (min)
55
50
250 450 650 850 1050 1250 1450
Switching Frequency (kHz)
Fig. 14. Maximum duty cycle v/s switching
frequency.
1650
? V in ? F s ?
0.6 V
150 ns
? 4 ? 10 6 V/s
Therefore, at the maximum recommended input
voltage 16V and minimum output voltage, the
converter should be designed at a switching
frequency that does not exceed 250 kHz.
Conversely, for operation at the maximum
recommended operating frequency (1.65 MHz)
and minimum output voltage (0.6V), The input
voltage (PVin) should not exceed 2.42V,
otherwise pulse skipping will happen.
At low output voltages (below 1V) specially at
Vo=0.6V, it is recommended to design the
compensator so that the bandwidth of the loop
does not exceed 1/10 of the switching frequency.
Rev 1.31
20
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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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