参数资料
| 型号： | ISL6260CCRZ-T |
| 厂商： | Intersil |
| 文件页数： | 24/28页 |
| 文件大小： | 0K |
| 描述： | IC REG PWM MULTI-PHASE 40-QFN |
| 标准包装： | 4,000 |
| 应用： | 转换器，Intel IMVP-6 |
| 输出数： | 1 |
| 输出电压： | 0.3 V ~ 1.5 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 带卷 (TR) |
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ISL6260C
10uA
OCSET
1 -
1 -
RS EQV =
Vdcr EQV = Iout ×
( Rntc + Rseries ) × Rpar
( Rntc + Rseries ) + Rpar
OC
-
+
Internal to
ISL6260
+
Σ
+
+
+
+
DROOP
-
VSUM
DFB
DROOP
VSUM
+
VN
Rn =
RS
N
DCR
N
-
VDIFF
RTN
VSEN
VO'
VO'
RO EQV =
RO
N
FIGURE 47. EQUIVALENT MODEL FOR DROOP AND DIE SENSING USING DCR SENSING
We do this using the assumption that we desire
approximately a 0.57 gain from the DCR voltage, Vdcr, to the
Rn network. We call this gain, G1.
Rdrp2 is selected to be a 8.25k_1% resistor. Note, we
choose to ignore the RO resistors because they do not add
significant error.
G1 = 0.57
(EQ. 10)
These values are extremely sensitive to layout and coupling
factor of the NTC to the inductor. As only one NTC is
After simplification, then RS EQV is given by Equation 11:
required in this application, this NTC should be placed as
RS EQV = ? -------- – 1 ? Rn = 2.56k Ω
1
? G1 ?
(EQ. 11)
close to the Channel 1 inductor as possible. And very
importantly, the PCB traces sensing the inductor voltage
should be go directly to the inductor pads.
The individual resistors from each phase to the VSUM node,
labeled RS1, RS2 and RS3 in Figure 46, are then given by
Equation 12, where N is 3, for the number of channels in
active operation.
Once the board has been laid out, some adjustments may
be required to adjust the full load droop voltage. This can be
accomplished by allowing the system to achieve thermal
equilibrium at full load, and then adjusting Rdrp2 to obtain
RS = N × RS EQV = 7.69k Ω
(EQ. 12)
the appropriate load line slope.
To see whether the NTC has compensated the temperature
Choosing RS = 7.68k_1% is a good choice. Once we know
the attenuation of the RS and RN network, we can then
determine the Droop amplifier Gain required to achieve the
load line. Setting Rdrp1 = 1k_1%, then Rdrp2 is can be
found using Equation 13.
change of the DCR, the user can apply full load current and
wait for the thermal steady state and see how much the
output voltage will deviate from the initial voltage reading. A
good NTC thermistor compensation can limit the output
voltage drift to 2mV. If the output voltage is decreasing with
temperature increase, that ratio between the NTC thermistor
Rdrp2 = ? -------------------------------- – 1 ? × Rdrp1
N × Rdroop
? DCR × G1 ?
(EQ. 13)
value and the rest of the resistor divider network has to be
increased. Users should use the ISL6260C evaluation board
component values and follow the evaluation board layout of
Rdrp2 = ? ------------------------------------ – 1 ? × 1K = 8.21k Ω
3 × 0.0021
Setting N = 3 for 3 channel operation, Droop Impedance
(Rdroop) = 0.0021 (V/A) as per the Intel IMVP-6+
specification, DCR = 0.0012 Ω typical, Rdrp1 = 1k Ω and the
attenuation gain (G1) = 0.57, Rdrp2 is then:
(EQ. 14)
? 0.0012 × 0.57 ?
24
NTC as much as possible to minimize engineering time.
The 2.1mV/A load line should be adjusted by Rdrp2 based on
maximum current steps, not based on small current steps.
Basically, if the max current is 40A, the required droop voltage
is 84mV with 2.1m Ω load line impedance. The user should
have 40A load current on the converter and look for 84mV
droop. If the droop voltage is less than 84mV, for example,
80mV. The new value will be calculated by Equation 15:
FN9259.3
June 21, 2010
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相关代理商/技术参数 |
参数描述 |
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| ISL6260CIRZ | 功能描述:电流型 PWM 控制器 MULTI-PHS(3 PHS EXT DC/DC BUCK CONT RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6260CIRZ-T | 功能描述:电流型 PWM 控制器 MULTI-PHS(3 PHS EXT DC/DC BUCK CONT RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6260CRZ | 功能描述:直流/直流开关调节器 MULTI-PHS3 PHS EXT DC/DC BUCK CNTRLR RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL6260CRZR5242 | 制造商:Intersil Corporation 功能描述:53289C01 MASK ONLY WITH DOT ON BRAND - Rail/Tube |
| ISL6260CRZ-T | 功能描述:直流/直流开关调节器 MULTI-PHS3 PHS EXT BUCK CONT IMVP-6 4 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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