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参数资料
| 型号： | IRDC3839 |
| 厂商： | International Rectifier |
| 文件页数： | 25/35页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL REG 6A SUPIRBUCK DC/DC |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 6A |
| 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： | IR3839 |
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IR3839MPbF
F Z 2 ? F o
? 17.63 kHz
Select crossover frequency F 0 =100 kHz
Since F LC <F 0 <Fs/2<F ESR , Type III is selected to
place the pole and zeros.
Detailed calculation of compensation Type III :
Desired Phase Margin ? ? 70 o
1 ? sin ?
1 ? sin ?
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 (40% increase due to
temperature has been considered in below).
F P 2 ? F o
1 ? sin ?
1 ? sin ?
? 567.1 kHz
I SET ? I L ( critical ) ?
R OCSet ? I OCSet
R DS ( on )
.......... .......... ... (33)
R DS ( on ) ? 14 . 1 m ? * 1.4 ? 19 . 74 m ?
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 :
I SET ? I o ( LIM ) ? 6 A * 1.5 ? 9 A
(50% over nominal output current )
I OCSet ? 29.54 μ A (at F s ? 600 kHz)
R OCSet ? 6 . 01 k ? Select R OCSet ? 5 . 9 k ?
The optional filter capacitor from OCSet pin to
PGnd has not been used for this design.
R 3 ?
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 ? 3 . 21 k ?
Setting the Power Good Threshold
In this design IR3839 is used in normal (non-
tracking, non-sequencing) mode, therefore the
PGood thresholds are internally set at 85% and
Select : R 3 ? 3 . 24 k ?
115% of Vref. At startup as soon as the internal
soft start signal reaches 2V (Figure 11), and
C 4 ?
1
2 π * F Z 1 * R 3
; C 4 ? 5 . 57 nF, Select : C 4 ? 5 . 6 nF
assuming Fb voltage follows Vref, the PGood is
asserted. As long as the voltage at the Fb pin is
between the thresholds (mentioned above),
Enable is high, and no fault happens, the PGood
C 3 ?
1
2 π * F P 3 * R 3
; C 3 ? 163 pF , Select : C 3 ? 150 pF
remains high.
The PGood is an open drain output. Hence, it is
Calculate R 10 , R 8 and R 9 :
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
R 10 ?
1
2 π * C 7 * F P 2
; R 10 ? 128 ? , Select : R 10 ? 127 ?
current flowing into the PGood pin to less than
5mA when the output voltage is not in regulation.
A typical value used is 10k ? .
R 8 ?
1
2 π * C 7 * F Z 2
- R 10 ; R 8 ? 3.98 k ? ,
Vref Bypass Capacitor
A bypass capacitor of about 0.1uF is required to
be placed between Vref and Gnd pins. This
Select : R 8 ? 4.02 k ?
capacitor should be placed as close as possible
to Vref pin.
R 9 ?
V ref
V o - V ref
* R 8 ; R 9 ? 2.01 k ? Select : R 9 ? 2 k ?
Rev 1.41
25
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3840 | 功能描述:电源管理IC开发工具 IR3840 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 |
| IRDC3840A | 制造商:IRF 制造商全称:International Rectifier 功能描述:USER GUIDE FOR IR3840A EVALUATION BOARD |
| IRDC3840W | 功能描述:电源管理IC开发工具 User Guide IR3840W 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 |
| 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 |
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