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参数资料
| 型号： | IR3832WMTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 22/32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 |
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PD-97508
IR3832WMPbF
F Z 2 = F o
= 10.58 kHz
Detailed calculation of compensation TypeIII
Desired Phase Margin Θ = 70 o
1 ? sin Θ
1 + sin Θ
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.
F P 2 = F o
1 + sin Θ
1 ? sin Θ
= 340.28 kHz
The R DS(on) has a positive temperature
coefficient and it should be considered for the
worst case operation.
Select : F Z 1 = 0 . 5 * F Z 2 = 5.29 kHz and
I SET = I L ( critical ) =
R OCSet ? I OCSet
R DS ( on )
.......... .......... ... (32)
F P 3 = 0.5 * F s = 200 kHz
Select : C 7 = 2.2 nF
Calculate R 3 , C 3 and C 4 :
R DS ( on ) = 14.3 m Ω * 1.25 = 17.87 m Ω
I SET ? I o ( LIM ) = 4 A * 1.5 = 6 A
(50% over nominal output current)
I OCSet = 39.22 μ A (at F s = 400 kHz)
R OCSet = 2.73 k Ω Select R 7 = 2.74 k Ω
R 3 =
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 = 2.78 k Ω
Setting the Power Good Threshold
Select : R 3 = 3.48 k Ω
A window comparator internally sets a lower
Power Good threshold at 85% of Vp and an
upper Power Good threshold at 115% of Vp.
C 4 =
C 3 =
1
2 π * F Z 1 * R 3
1
2 π * F P 3 * R 3
; C 4 = 10.75 nF, Select : C 4 = 10 nF
; C 3 = 228 pF , Select : C 3 = 220 pF
When the voltage at the FB pin is within the
window set by these thresholds, PGood is
asserted.
The PGood is an open drain output. Hence, it is
necessary to use a pull up resistor R PG from
PGood pin to Vcc. The value of the pull-up
Calculate R 10 , R 8 and R 9 :
resistor must be chosen such as to limit the
current flowing into the PGood pin, when the
output voltage is not in regulation, to less than 5
R 10 =
1
2 π * C 7 * F P 2
; R 10 = 215 Ω , Select : R 10 = 210 Ω
mA. A typical value used is 10k ? .
R 8 =
1
2 π * C 7 * F Z 2
- R 10 ; R 8 = 6.63 k Ω ,
Select : R 8 = 6.65 k Ω
Rev 6.0
22
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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 |
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