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参数资料
| 型号： | IRDC3842W |
| 厂商： | International Rectifier |
| 文件页数： | 23/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR IR3842W 4A 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： | 4A |
| 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： | IR3842W |
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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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3843 | 制造商:International Rectifier 功能描述:BOARD EVALUATION IR3843 |
| IRDC3843A | 功能描述:电源管理IC开发工具 IR3843 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 |
| IRDC3843W | 功能描述:电源管理IC开发工具 User Guide IR3843W 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 |
| IRDC3853 | 功能描述:电源管理IC开发工具 User Guide IR3853 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 |
| IRDC3853 - SUPIRBUCK | 制造商:International Rectifier 功能描述:INTERNATIONAL RECIFIER - GEN 2.1 SUPIRBUCK FAMILY - Bulk |
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