- 您现在的位置：买卖IC网 > PDF目录1810 > IR3842WMTRPBF (International Rectifier)IC REG BUCK SYNC ADJ 4A 15QFN PDF资料下载
参数资料
| 型号： | IR3842WMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 23/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 15QFN |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 标准包装： | 4,000 |
| 系列： | SupIRBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 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： | 4A |
| 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： | 15-PowerVQFN |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | PQFN（5x6） |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页当前第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页
PD-97659
IR3842WMPbF
F Z 2 = F o
= 17.63 kHz
F P 2 = F o
= 567.1 kHz
R OCSet ? I OCSet
Detailed calculation of compensation TypeIII
Desired Phase Margin Θ = 70 o
1 ? sin Θ
1 + sin Θ
1 + sin Θ
1 ? sin Θ
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 :
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.
)
I SET = I L ( critical = .......... .......... (32)
R DS ( on )
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 = 59.07 μ A (at F s = 600 kHz)
R OCSet = 1.82 k Ω Select R 7 = 1.82 k Ω
R 3 =
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 = 3.08 k Ω
Setting the Power Good Threshold
A window comparator internally sets a lower
Power Good threshold at 0.595V and an upper
Power Good threshold at 0.805V. When the
Select : R 3 = 3.09 k Ω
voltage at the FB pin is within the window set by
these thresholds, PGood is asserted.
C 4 =
C 3 =
1
2 π * F Z 1 * R 3
1
2 π * F P 3 * R 3
; C 4 = 5 . 84 nF, Select : C 4 = 5.6 nF
; C 3 = 171.69 pF , Select : C 3 = 150 pF
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
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
mA. A typical value used is 10k ? .
Calculate R 10 , R 8 and R 9 :
R 10 =
R 8 =
1
2 π * C 7 * F P 2
1
2 π * C 7 * F Z 2
; R 10 = 128 Ω , Select : R 10 = 130 Ω
- R 10 ; R 8 = 3.97 k Ω ,
Select : R 8 = 3.92 k Ω
R 9 =
V ref
V o - V ref
* R 8 ; R 9 = 2.49 k Ω Select : R 9 = 2.49 k Ω
Rev 13.0
23
相关PDF资料 |
PDF描述 |
|---|---|
| IR3843AMTRPBF | IC REG BUCK SYNC ADJ 3A QFN |
| IR3843WMTRPBF | IC REG BUCK SYNC ADJ 2A 15QFN |
| IR3853MTRPBF | IC REG BUCK SYNC ADJ 4A 17PQFN |
| IR3856MTRPBF | IC REG BUCK SYNC ADJ 6A 17PQFN |
| IR3856WMTRPBF | IC REG BUCK SYNC ADJ 6A 17QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3843AMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 3A SYNCHRONOUS BUCK REGULATOR |
| IR3843AMTR1PBF | 功能描述:直流/直流开关调节器 3A SupIRBuck Reg 250-1200kHz, 1.5-21V 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 |
| IR3843AMTRPBF | 功能描述:直流/直流开关调节器 3A SupIRBuck Reg 250-1200kHz, 1.5-21V 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 |
| IR3843WMPBF | 制造商:International Rectifier 功能描述:2A SUPIRBUCK VOLTAGE REGULATOR WITH PGOOD - Bulk |
| IR3843WMPBF_12 | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 2A SYNCHRONOUS BUCK REGULATOR |
发布紧急采购，3分钟左右您将得到回复。