参数资料
| 型号： | ISL6277IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 30/37页 |
| 文件大小： | 0K |
| 描述： | IC PWM REG MULTIPH AMD 48-QFN |
| 标准包装： | 4,000 |
| 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： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（6x6） |
| 包装： | 带卷 (TR) |
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ISL6277
V Cn = ? ------------------------------------------ ? ------------- ? ? I o (EQ. 26)
? R ntcnet + --------------- ?
Resistor Current-Sensing Network
PHASE1 PHASE2 PHASE3
L L L
For inductor DCR sensing, Equation 26 gives the DC relationship
of V cn (s) and I o (s):
? ?
? R ntcnet DCR ?
? R sum N ?
N
I droop = ----- ? ------------------------------------------ ? ------------- ? I o
R sum
R i
R ntcnet + ---------------
DCR
DCR
DCR
R SUM
R SUM
R SUM
I SUM+
Substitution of Equation 26 into Equation 1 gives Equation 27:
1 R ntcnet DCR
(EQ. 27)
N
N
+
RSEN
RSEN
RSEN
R O
VCN
-
CN
RI
I SUM-
Therefore:
R i = ----------------------------------------------------------------------------------
N ? ? R ntcnet + --------------- ? ? I droop
R O
R O
? N ?
R ntcnet ? DCR ? I o
R sum
(EQ. 28)
V Cn ? s ? = ------------- ? I o ? s ? ? A Rsen ? s ?
A Rsen ? s ? = -----------------------
(EQ. 24)
1 + -------------
? R ntcs + R ntc ? ? R p
---------------------------------------------------- ? DCR ? I omax
? ? R ntcs + R ntc ? ? R p
N ? ? ---------------------------------------------------- + --------------- ? ? I droopmax
I O
FIGURE 28. RESISTOR CURRENT-SENSING NETWORK
Figure 28 shows the resistor current-sensing network for a
3-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 23 thru 25 give the
V Cn (s) expression.
R sen (EQ. 23)
N
1
s
? sns
Substitution of Equation 18 and application of the OCP condition
in Equation 28 gives Equation 29:
R ntcs + R ntc + R p
R i = ----------------------------------------------------------------------------------------------------------------------------- (EQ. 29)
R sum ?
? 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 = 3,
R sum = 3.65k ? , R p = 11k ? , R ntcs = 2.61k ? , R ntc = 10k ? ,
DCR = 0.9m ? , I omax = 65A and I droopmax = 45 μ A. Equation 29
gives R i = 359 ? .
For resistor sensing, Equation 30 gives the DC relationship of
V cn (s) and I o (s).
? Rsen = -----------------------------
--------------- ? C n
V Cn = ------------- ? I o
R sen
1
R sum
N
(EQ. 25)
(EQ. 30)
N
Substitution of Equation 30 into Equation 1 gives Equation 31:
I droop = ----- ? ------------- ? I o
R i
N ? I droop
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
network.
The recommended values are R sum = 1k ? and C n = 5600pF.
1 R sen
N
Therefore:
R sen ? I o
R i = ---------------------------
(EQ. 31)
(EQ. 32)
N ? I droopmax
Overcurrent Protection
Refer to Equation 1 on page 17 and Figures 22, 26 and 28;
resistor R i sets the droop current, I droop . Tables 1 and 2 show the
internal OCP threshold. It is recommended to design I droop
without using the R comp resistor.
For example, the OCP threshold is 1.5V on the IMON pin. This
translates to 45 μ A of ISUM current or 56.25 μ A of droop current.
I droop is designed to be 45 μ A at full load, so the OCP trip level is
1.25x of the full load current.
30
Substitution of Equation 32 and application of the OCP condition
in Equation 28 gives Equation 33:
R sen ? I omax
R i = -------------------------------------- (EQ. 33)
where I omax is the full load current and I droopmax is the
corresponding droop current. For example, given N = 3,
R sen = 1m ? , I omax = 65A and I droopmax = 45μA, Equation 33
gives R i = 481 ? .
FN8270.1
March 8, 2012
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