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参数资料
| 型号： | IRDC3853 |
| 厂商： | International Rectifier |
| 文件页数： | 24/35页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR IR3853 |
| 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： | 0 ~ 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： | IR3853 |
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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 |
|---|---|
| IRDC3853 - SUPIRBUCK | 制造商:International Rectifier 功能描述:INTERNATIONAL RECIFIER - GEN 2.1 SUPIRBUCK FAMILY - Bulk |
| IRDC3853 | 制造商:International Rectifier 功能描述:; MCU Supported Families:IR3853; Feature |
| IRDC3856 | 功能描述:BOARD EVAL FOR IR3856 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:SupIRBuck™ 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| IRDC3856 - SUPIRBUCK | 制造商:International Rectifier 功能描述:INTERNATIONAL RECIFIER - GEN 2.1 SUPIRBUCK FAMILY - Bulk |
| IRDC3856 | 制造商:International Rectifier 功能描述:; MCU Supported Families:IR3856; Feature |
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