参数资料
型号: IR3856MTRPBF
厂商: International Rectifier
文件页数: 24/35页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 6A 17PQFN
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 ~ 18.9 V
输入电压: 1.5 V ~ 21 V
PWM 型: 电压模式
频率 - 开关: 225kHz ~ 1.65MHz
电流 - 输出: 6A
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: 17-PowerVQFN
包装: 带卷 (TR)
供应商设备封装: 17-PQFN(4x5)
PD-97528
IR3856MPbF
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 ) = 13 . 4 m ? * 1.25 = 1 6 . 62 m ?
I SET ? I o ( LIM ) = 6 A * 1.5 = 9 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 = 2.55 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 = 1.63 k ?
The following formula can be used to set the
threshold:
C 4 =
; C 4 = 10 . 94 nF, Select : C 4 = 10 nF
R 6 = (
? 1 ) * R 7
V o ( PGood _ TH )
Select : R 3 = 1.65 k Ω
1
2 π * F Z 1 * R 3
- - (33)
0 . 85 * V ref
Where: 0.85*Vref is reference of the internal
C 3 =
1
2 π * F P 3 * R 3
; C 3 = 327 pF , Select : C 3 = 270 pF
comparator, for IR3856.
V o(PGood_TH) is the selectable output voltage
threshold for power good, for this design it is
R 10 =
; R 10 = 130 ? , Select : R 10 = 130 ?
R 8 =
- R 10 ; R 8 = 3.97 k ? ,
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 ?
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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