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参数资料
| 型号： | IR3837MTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 26/36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
F Z 2 ? F o
? 17.63 kHz
Select crossover frequency F 0 =100 kHz
Since F LC <F 0 <Fs/2<F ESR , Type III is selected to
place the pole and zeros.
Detailed calculation of compensation Type III :
Desired Phase Margin ? ? 70 o
1 ? sin ?
1 ? sin ?
Programming the Current-Limit
The Current-Limit threshold can be set by
connecting a resistor (R OCSet ) from the SW pin
to the OCSet pin. The resistor can be calculated
by using equation (4). This resistor (R OCSet ) must
be placed close to the IC.
The R DS(on) has a positive temperature
coefficient and it should be considered for the
worst case operation (40% increase due to
temperature has been considered in below).
F P 2 ? F o
1 ? sin ?
1 ? sin ?
? 567.1 kHz
I SET ? I L ( critical ) ?
R OCSet ? I OCSet
R DS ( on )
.......... .......... ... (33)
R DS ( on ) ? 5 . 3 m ? * 1.4 ? 7.42 m ?
Select : F Z 1 ? 0 . 5 * F Z 2 ? 8.82 kHz and
F P 3 ? 0.5 * F s ? 300 kHz
Select : C 7 ? 2.2 nF
Calculate R 3 , C 3 and C 4 :
I SET ? I o ( LIM ) ? 14 A * 1.5 ? 21 A
(50% over nominal output current )
I OCSet ? 29.54 μ A (at F s ? 600 kHz)
R OCSet ? 5 . 28 k ? Select R OCSet ? 5 . 23 k ?
The optional filter capacitor from OCSet pin to
PGnd has not been used for this design.
R 3 ?
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 ? 3 . 98 k ?
Setting the Power Good Threshold
In this design IR3837 is used in normal (non-
tracking, non-sequencing) mode, therefore the
PGood thresholds are internally set at 85% and
Select : R 3 ? 4.02 k ?
115% of Vref. At startup as soon as the internal
soft start signal reaches 2V (Figure 11), and
C 4 ?
1
2 π * F Z 1 * R 3
; C 4 ? 4 . 49 nF, Select : C 4 ? 4 . 7 nF
assuming Fb voltage follows Vref, the PGood is
asserted. As long as the voltage at the Fb pin is
between the thresholds (mentioned above),
Enable is high, and no fault happens, the PGood
C 3 ?
1
2 π * F P 3 * R 3
; C 3 ? 132 pF , Select : C 3 ? 120 pF
remains high.
The PGood is an open drain output. Hence, it is
Calculate R 10 , R 8 and R 9 :
necessary to use a pull up resistor, R PG , from
PGood pin to Vcc. The value of the pull-up
resistor must be chosen such as to limit the
R 10 ?
1
2 π * C 7 * F P 2
; R 10 ? 127.5 ? , Select : R 10 ? 127 ?
current flowing into the PGood pin to less than
5mA when the output voltage is not in regulation.
A typical value used is 10k ? .
R 8 ?
1
2 π * C 7 * F Z 2
- R 10 ; R 8 ? 3.98 k ? ,
Vref Bypass Capacitor
A bypass capacitor of about 0.1uF is required to
be placed between Vref and Gnd pins. This
Select : R 8 ? 4.02 k ?
capacitor should be placed as close as possible
to Vref pin.
R 9 ?
V ref
V o - V ref
* R 8 ; R 9 ? 2.01 k ? Select : R 9 ? 2 k ?
Rev 1.31
26
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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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