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参数资料
| 型号： | IRDC3856W |
| 厂商： | International Rectifier |
| 文件页数： | 23/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SUPIRBUCK IR3856W |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 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： | 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： | IR3856W |
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PD-97506
IR3856WMPbF
Desired Phase Margin Θ = 70
F Z 2 = F o
= 17.63 kHz
F P 2 = F o
= 567.1 kHz
Detailed calculation of compensation Type-III
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
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.
F P 3 = 0.5 * F s = 300 kHz
Select : C 7 = 2.2 nF
I SET = I L ( critical ) =
R OCSet ? I OCSet
R DS ( on )
.......... .......... ... (32)
Calculate R 3 , C 3 and C 4 :
R DS ( on ) = 14.3 m Ω * 1.25 = 17.875 m Ω
R 3 =
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 = 2.56 k Ω
I SET ? I o ( LIM ) = 6 A * 1.5 = 9 A
(50% over nominal output current )
C 4 =
; C 4 = 8 . 84 nF, Select : C 4 = 10 nF
C 3 =
; C 3 = 258.79 pF , Select : C 3 = 220 pF
Select : R 3 = 2.55 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 :
I OCSet = 59.07 μ A (at F s = 600 kHz)
R OCSet = 2.694 k Ω Select R 7 = 2.67 k Ω
Setting the Power Good Threshold
Power Good threshold is internally set at 88% of
Vref. When the voltage at the FB pin exceeds the
threshold, PGood is asserted.
The PGood is an open drain output. Hence, it is
R 10 =
1
2 π * C 7 * F P 2
; R 10 = 128 Ω , Select : R 10 = 130 Ω
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 8 =
1
2 π * C 7 * F Z 2
- R 10 ; R 8 = 3.97 k Ω ,
current flowing into the PGood pin, when the
output voltage is not in regulation, to less than
5mA. A typical value used is 10k ? .
Select : R 8 = 4.02 k Ω
R 9 =
V ref
V o - V ref
* R 8 ; R 9 = 2.57 k Ω Select : R 9 = 2.55 k Ω
Rev 9.0
23
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