参数资料
| 型号： | ISL62771IRTZ-T |
| 厂商： | Intersil |
| 文件页数： | 29/36页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR MULTIPHASE 40TQFN |
| 标准包装： | 6,000 |
| 系列： | Robust Ripple Regulator™ (R³) |
| 应用： | 控制器，AMD Fusion? SVI 2.0 CPU GPU |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 2 |
| 输出电压： | 0.006 V ~ 1.55 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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ISL62771
Resistor Current-Sensing Network
PHASE1 PHASE2
For inductor DCR sensing, Equation 22 gives the DC relationship
of V cn (s) and I o (s):
V Cn = ? ? × I o
? R ntcnet + --------------- ?
L
L
? ?
? R ntcnet DCR ?
------------------------------------------ × -------------
? R sum N ?
N
(EQ. 22)
DCR
DCR
Substitution of Equation 22 into Equation 2 gives Equation 23:
I droop = --- × ----- × ------------------------------------------ × ------------- × I o
R sum
R i
R ntcnet + ---------------
R SUM
R SUM
I SUM+
5 1 R ntcnet DCR
N
4 N
(EQ. 23)
+
RSEN
RSEN
VCN
CN
Therefore:
5 R ntcnet × DCR × I o
R i = --- × ----------------------------------------------------------------------------------
R sum
N × ? R ntcnet + --------------- ? × I droop
R O
R O
-
RI
I SUM-
4
? N ?
(EQ. 24)
Substitution of Equation 14 and application of the OCP condition
in Equation 24 gives Equation 25:
V Cn ( s ) = ------------- × I o ( s ) × A Rsen ( s )
A Rsen ( s ) = -----------------------
(EQ. 20)
1 + -------------
ω Rsen = -----------------------------
R sum
---------------------------------------------------- × DCR × I omax
R i = --- × -----------------------------------------------------------------------------------------------------------------------------
? ( R ntcs + R ntc ) × R p
(EQ. 25)
R sum ?
N × ? ---------------------------------------------------- + --------------- ? × I droopmax
V Cn = ------------- × I o
R sen
I droop = --- × ----- × ------------- × I o
5 1 R sen
R i
I O
FIGURE 26. RESISTOR CURRENT-SENSING NETWORK
Figure 26 shows the resistor current-sensing network for a
2-phase solution. Each inductor has a series current sensing
resistor, R sen . R sum and R o are connected to the R sen pads to
accurately capture the inductor current information. The R sum
and R o resistors are connected to capacitor C n . R sum and C n
form a filter for noise attenuation. Equations 19 thru 21 give the
V Cn (s) expression.
R sen (EQ. 19)
N
1
s
ω sns
1
(EQ. 21)
N
--------------- × C n
Transfer function A Rsen (s) always has unity gain at DC.
Current-sensing resistor R sen value does not have significant
variation over-temperature, so there is no need for the NTC
( R ntcs + R ntc ) × R p
5 R ntcs + R ntc + R p
4
? R ntcs + R ntc + R p N ?
where I omax is the full load current and I droopmax is the
corresponding droop current. For example, given N = 2,
R sum = 3.65k Ω , R p = 11k Ω , R ntcs = 2.61k Ω , R ntc = 10k Ω ,
DCR = 0.88m Ω , I omax = 50A and I droopmax = 45μA. Equation 25
gives R i = 466 Ω .
For resistor sensing, Equation 26 gives the DC relationship of
V cn (s) and I o (s).
(EQ. 26)
N
Substitution of Equation 26 into Equation 2 gives Equation 27:
(EQ. 27)
4 N
Therefore:
R i = --- × ---------------------------
N × I droop
network.
The recommended values are R sum = 1k Ω and C n = 5600pF.
4
5 R sen × I o
(EQ. 28)
R i = --- × --------------------------------------
N × I droopmax
(EQ. 29)
Overcurrent Protection
Refer to Equation 2 on page 17 and Figures 20, 24 and 26;
resistor R i sets the I sum current which is proportional to droop
current and IMON current. Tables 1 and 2 show the internal OCP
threshold based on the IMON pin voltage. Since the R i resistor
impacts both the droop current and the IMON current, fine
adjustments to I droop will require changing the R comp resistor.
For example, the OCP threshold is 1.5V on the IMON pin, which
equates to an IMON current of 11.25μA using a 133k Ω IMON
resistor. The corresponding ISUM current is 45μA, which results
in an I droop of 56.25μA. At full load current, I omax , the ISUM
current is 36μA and the resulting I droop is 45μA. The ratio of the
ISUM current at OCP relative to full load is 1.25. Therefore, the
OCP current trip level is 25% higher than the full load current.
29
Substitution of Equation 28 and application of the OCP condition
in Equation 24 gives Equation 29:
5 R sen × I omax
4
where I omax is the full load current and I droopmax is the
corresponding droop current. For example, given N = 2,
R sen = 1m Ω , I omax = 50A and I droopmax = 45μA, Equation 29
gives R i = 694 Ω .
Load Line Slope
See Figure 13 for load-line implementation.
FN8321.2
September 12, 2013
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL62773 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for AMD Fusiona?￠ Desktop CPUs Using SVI 2.0 |
| ISL62773HRZ | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP 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 |
| ISL62773HRZ-T | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP 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 |
| ISL62773IRZ | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP 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 |
| ISL62773IRZ-T | 功能描述:电流型 PWM 控制器 MULTI-OUTPUT CNTRLR FOR AMD FUSION UP 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 |
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