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| 型号： | IR3853MTR1PBF |
| 厂商： | International Rectifier |
| 文件页数： | 24/35页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 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： | 0.7 V ~ 18.9 V |
| 输入电压： | 1.5 V ~ 21 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： | 17-PowerVQFN |
| 包装： | 标准包装 |
| 供应商设备封装： | 17-PQFN（4x5） |
| 其它名称： | IR3853MTR1PBFDKR |
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PD-97516
IR3853MPbF
F Z 2 = F o
= 1 7 . 63 kHz
Detailed calculation of compensation Type-III
Desired Phase Margin Θ = 70 o
1 ? sin Θ
1 + sin Θ
R DS ( on ) = 19 . 75 m ? * 1.25 = 24.687 m ?
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)
F P 2 = F o
1 + sin Θ
1 ? sin Θ
= 567.1 kHz
R OCSet = 2.51 k ? Select
R 7 = 2.55 k ?
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 :
Setting the Power Good Threshold
Power Good threshold can be programmed by
using two external resistors (R5, R7 on Page 24).
R 3 =
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 = 2.44 k ?
The following formula can be used to set the
threshold:
C 4 =
; C 4 = 7 . 43 nF, Select : C 4 = 8.2 nF
R 6 = (
? 1 ) * R 7
V o ( PGood _ TH )
C 3 =
; C 3 = 222 pF , Select : C 3 = 220 pF
R 10 =
; R 10 = 128 ? , Select : R 10 = 130 ?
R 8 =
- R 10 ; R 8 = 3.97 k ? ,
Select : R 3 = 2.43 k Ω
1
2 π * F Z 1 * R 3
1
2 π * F P 3 * R 3
Calculate R 10 , R 8 and R 9 :
1
2 π * C 7 * F P 2
1
2 π * C 7 * F Z 2
Select : R 8 = 4.02 k ?
- - (33)
0 . 85 * V ref
Where: 0.85*Vref is reference of the internal
comparator, for IR3853.
V o(PGood_TH) is the selectable output voltage
threshold for power good, for this design it is
1.53V (i.e. 0.85*1.8V).
Select R 7 =2.55KOhm
Using (24): R 5 =3.97KOhm
Select R 6 =4.02KOhm
The PGood is an open drain output. Hence, it is
R 9 =
V ref
V o - V ref
* R 8 ; R 9 = 2.56 k ? Select : R 9 = 2.55 k ?
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
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.
output voltage is not in regulation, to less than 5
mA. A typical value used is 10k ? .
I SET = I L ( critical ) =
Rev 4.0
R OCSet ? I OCSet
R DS ( on )
.......... . (32)
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3853MTR1PBF | 制造商:International Rectifier 功能描述:IC DC-DC CONV 1.5 MHz QFN-17 |
| IR3853MTRPBF | 功能描述:直流/直流开关调节器 4A SupIRBuck Reg 250-1500kHz, 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 |
| IR3856MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGHLY EFFICIENT INTEGRATED 6A, SYNCHRONOUS BUCK REGULATOR |
| IR3856MTR1PBF | 功能描述:直流/直流开关调节器 6A SupIRBuck Reg 250-1500kHz, 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 |
| IR3856MTR1PBF-CUT TAPE | 制造商:IR 功能描述:IR3856MPbF Series 21V 6 A Highly Efficient Integrated Synchronous Buck Regulator |
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