参数资料
型号: IR3084AMTRPBF
厂商: International Rectifier
文件页数: 27/45页
文件大小: 0K
描述: IC CTLR XPHASE 28-MLPQ
产品变化通告: (EP) Parts Discontinuation 25/May/2012
标准包装: 1
系列: XPhase™
应用: 处理器
电流 - 电源: 14mA
电源电压: 9.5 V ~ 16 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 28-MLPQ
供应商设备封装: 28-MLPQ(5x5)
包装: 标准包装
其它名称: IR3084AMTRPBFDKR
IR3084A
Soft Start Capacitor C SS/DEL and Resistor R SS/DEL
Because the capacitor C SS/DEL programs three different time parameters, i.e. soft start time, over current latch
delay time, and the frequency of hiccup mode, they should be considered together while choosing C SS/DEL .
The soft-start ramp time (TD2) is the time required for the converter’s output voltage to rise from 0V to the DAC
voltage (VDAC). Given a desired soft-start ramp time (TD2) and the soft-start charge current (I CHG ) from the data
sheet, the value of the external capacitor (C SS/DEL ) can be calculated using Equation (9).
VDAC ? ? 1 ?
?
VDAC ? ? 1 ?
?
C SS / DEL ?
I CHG * TD 2
? RFB ?
? RFB ? RDRP ?
?
70 * 10 ? 6 * TD 2
? RFB ?
? RFB ? RDRP ?
(9)
Where: VDAC = 1.1V in Boot Mode or the DAC voltage set by the VID pins without Boot Mode.
RFB is the resistor from Vcore to the FB pin of the controller.
RDRP is the resistor from VDRP to FB.
If droop is not used, set the second term within the parenthesis to zero (RDRP = ∞ ).
Once C SS/DEL is determined, the soft start delay time TD1, the VID sample time TD3, the VRRDY delay time TD5,
and the over-current fault latch delay time T OCDEL are determined and can be calculated using Equations (10),
(11), (12), and (13) respectively.
? ? 1 . 3 V ? VDAC ?
?
TD 1 ?
C SS / DEL
I CHG
?
?
RFB ?
RFB ? RDRP ?
(10)
Where: VDAC = 1.1V in Boot Mode or the DAC voltage set by the VID pins without Boot Mode.
ICHG is the soft-start charge current, nominally 70μA.
RFB is the resistor from Vcore to the FB pin of the controller.
RDRP is the resistor from VDRP to FB.
If droop is not used, set the second term within the parenthesis to zero (RDRP = ∞ ).
TD 3 ?
C SS / DEL
I CHG
? ? 3 . 1 V ? 1 . 3 V ? 1 . 1 V ? ?
C SS / DEL
70 * 10 ? 6
? 0 . 7 V
(11)
If Boot Mode is not used, then TD3 is zero.
TD 5 ?
C SS / DEL * (3. 85 V ? 3.1 V )
I CHG
? TD 4 ?
C SS / DEL * 0.75 V
70 * 10 ? 6
? TD 4
(12)
Where: TD4 is the VID voltage rise time calculated from Equation 4.
T OCDEL ?
C SS / DEL * 100 mV
I OC _ DISCHG
?
C SS / DEL * 100 mV
40 * 10 ? 6
(13)
Where: I OC_DISCHG is the over-current discharge current of the SS/DEL pin from the data sheet.
Page 27 of 45
3/3/2009
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