参数资料
型号: IR3084AMPBF
厂商: International Rectifier
文件页数: 26/45页
文件大小: 0K
描述: IC XPHASE CONTROL 28-MLPQ
标准包装: 100
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: 剪切带 (CT)
IR3084A
No Load Output Voltage Setting Resistor R VSETPT , Feedback Resistor RFB, and AVP Resistor R DRP
An external resistor, R VSETPT , connected between the VDAC pin and the VSETPT pin is used to set the no load
output voltage offset, V O_NLOFST , which is the difference between the V DAC voltage and output voltage at no load.
However, the converter’s output voltage will be set by the combination of VSETPT plus some contribution from
the VDRP pin. At no load, both pins of the Error Amplifier are at VDAC – VSETPT while the VDRP pin is at
VDAC + V OS ?G CSA (V OS and G CSA are the input offset and gain of the current sense amplifiers). Because the
VDRP pin is at a higher voltage than the FB pin of the Error Amplifier, VDRP will contribute to the no load offset
through the RDRP and RFB resistors. The design approach is to choose a value for the feedback resistor, RFB,
from 100 to 2K and then calculate RDRP and R VSETPT to provide the required no load offset voltage.
VSETPT ?
A * D ? C * B
(A ? B ? C ? D)
(5)
A ?
Io * R L * G CSA
n
? V CS _ TOFST * G CSA ? V OS_EA
C ? V CS _ TOFST * G CSA ? V OS_EA
B ? V O_NLOFST ? Io * Ro ? V OS_EA
D ? V O_NLOFST ? V OS_EA
Where :
I O is the full load output current of the converter
R L is the ESR of the output inductor
G CSA is the gain of the current sense amplifiers
n is the number of phases
V OS_EA is the offset voltage of the error amplifier ( ? to + pin)
V O_NLOFST is the desired no load offset voltage below the DAC setting
Ro is the desired load line resistance
V CS_TOFST is the total offset voltage of the current sense amplifiers, see below.
The total input offset voltage (V CS_TOFST ) of the current sense amplifier in the phase IC is the sum of input offset
(V CS_OFST) of the amplifier itself plus that created by the amplifier input bias currents flowing through the current
sense resistors R CS+ and R CS ? as shown in Equation (6).
V CS_TOFST ? V CS_OFST ? ? I CSIN ? ? R CS ? ? ? ? I CSIN ? ? R CS ? ?
(6)
Finally, calculate the no-load setpoint resistor using Equation (7) and the droop resistor using Equation (8);
RVSETPT ?
Where :
VSETPT
I VSETPT
I VSETPT is the current into the VSETPT pin at the switching
frequency which is a function of R OSC , see Figure 15 on page 23.
VSETPT is calculated by Equation (5).
(7)
RDRP ? RFB ?
Page 26 of 45
VSETPT ? C
D ? VSETPT
(8)
3/3/2009
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