参数资料
型号: IR3840AMTRPBF
厂商: International Rectifier
文件页数: 23/34页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 14A 15QFN
产品培训模块: SupIRBuck? Family and POL Design Tools Overview
标准包装: 4,000
系列: SupIRBuck™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.7 V ~ 14.4 V
输入电压: 1.5 V ~ 16 V
PWM 型: 电压模式
频率 - 开关: 225kHz ~ 1MHz
电流 - 输出: 14A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 15-PowerVQFN
包装: 带卷 (TR)
供应商设备封装: PQFN(5x6)
PD-97505
IR3840AMPbF
Desired Phase Margin Θ = 70
F Z 2 = F o
= 17.63 kHz
Detailed calculation of compensation TypeIII
o
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 ROCSET
must be placed close to the IC.
F P 2 = F o
1 + sin Θ
1 ? sin Θ
= 567.1 kHz
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 ) = 14A * 1.5 = 21 A
(50% over nominal output current )
I OCSet = 59.07 μ A (at F s = 600 kHz)
R OCSet = 2.53 k ? Select R 7 = 2.55 k ?
R 3 =
2 π * F o * L o * C o * V osc
C 7 * V in
; R 3 = 2.30 k Ω
Setting the Power Good Threshold
A window comparator internally sets a lower
Power Good threshold at 0.6V and an upper
Select : R 3 = 2.32 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 = 7.8 nF, Select : C 4 = 8.2 nF
; C 3 = 230.6 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 =
1
2 π * C 7 * F P 2
; R 10 = 128 Ω , Select : R 10 = 130 Ω
R 8 =
1
2 π * C 7 * F Z 2
- R 10 ; R 8 = 3.97 k Ω ,
Select : R 8 = 4.02 k Ω
R 9 =
V ref
V o - V ref
* R 8 ; R 9 = 2.56 k Ω Select : R 9 = 2.55 k Ω
Rev 11.0
23
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