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参数资料
| 型号： | IRDC3840W |
| 厂商： | International Rectifier |
| 文件页数： | 23/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR IR3840W 12A CONV |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 12A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3840W |
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PD-97657
IR3840WMPbF
F Z 2 = F o
= 17.63 kHz
F P 2 = F o
= 567.1 kHz
Detailed calculation of compensation TypeIII
Desired Phase Margin Θ = 70 o
1 ? sin Θ
1 + sin Θ
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.
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 = 8.82 kHz and
I SET = I L ( critical ) =
R OCSet ? I OCSet
R DS ( on )
.......... .......... ... (32)
F P 3 = 0.5 * F s = 300 kHz
Select : C 7 = 2.2 nF
Calculate R 3 , C 3 and C 4 :
R DS ( on ) = 5 . 7 m ? * 1.25 = 7.125 m ?
I SET ? I o ( LIM ) = 12 A * 1.5 = 18 A
(50% over nominal output current )
I OCSet = 59.07 μ A (at F s = 600 kHz)
R OCSet = 2.17 k ? Select R 7 = 2.15 k ?
R 3 =
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 = 1.85 k ?
Setting the Power Good Threshold
A window comparator internally sets a lower
Power Good threshold at 0.6V and an upper
Select : R 3 = 1.87 k Ω
Power Good threshold at 0.8V. When the 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 = 9.65 nF, Select : C 4 = 10 nF
; C 3 = 283.7 pF , Select : C 3 = 220 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 ? , Select : R 10 = 130 ?
- R 10 ; R 8 = 3.97 k ? ,
Select : R 8 = 3.92 k ?
R 9 =
V ref
V o - V ref
* R 8 ; R 9 = 2.49 k ? Select : R 9 = 2.49 k ?
Rev 12.0
23
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| IRDC3841 | 功能描述:电源管理IC开发工具 IR3841 SYNC CONV 600kHz EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3841W | 功能描述:电源管理IC开发工具 User Guide IR3841W Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3842 | 功能描述:电源管理IC开发工具 IR3842 SYNC CONV 600kHz EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3842A | 功能描述:电源管理IC开发工具 IR3842A SYNC CONV 300kHz EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3842W | 功能描述:电源管理IC开发工具 User Guide IR3842W Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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