参数资料
| 型号： | ISL62773IRZ-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 |
| 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： | 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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ISL62773
V Cn = ? ------------------------------------------ ? ------------- ? ? I o
? R ntcnet + --------------- ?
Resistor Current-Sensing Network
PHASE1 PHASE2 PHASE3
? ?
? R ntcnet DCR ?
? R sum N ?
N
(EQ. 26)
I droop = ----- ? ------------------------------------------ ? ------------- ? I o
(EQ. 27)
R sum
R i
R ntcnet + ---------------
R i = ---------------------------------------------------------------------------------- (EQ. 28)
N ? ? R ntcnet + --------------- ? ? I droop
L
DCR
L
DCR
L
DCR
R SUM
R SUM
R SUM
I SUM+
1 R ntcnet DCR
N
N
R ntcnet ? DCR ? I o
R sum
? N ?
Substitution of Equation 18 and application of the OCP condition
+
---------------------------------------------------- ? DCR ? I omax
? ? R ntcs + R ntc ? ? R p
R sum ?
N ? ? ---------------------------------------------------- + --------------- ? ? I droopmax
? R ntcs + R ntc + R p ?
RSEN
RSEN
RSEN
R O
R O
R O
VCN
-
CN
RI
I SUM-
in Equation 28 gives Equation 29:
? R ntcs + R ntc ? ? R p
R ntcs + R ntc + R p
R i = -----------------------------------------------------------------------------------------------------------------------------
N
(EQ. 29)
V Cn = ------------- ? I o
R sen
V Cn ? s ? = ------------- ? I o ? s ? ? A Rsen ? s ?
A Rsen ? s ? = -----------------------
(EQ. 24)
1 + -------------
? Rsen = -----------------------------
R sum
I droop = ----- ? ------------- ? I o
(EQ. 31)
R i
R sen ? I o
R i = ---------------------------
N ? I droopmax
V droop R droop R ntcnet DCR
I o R i R sum
R ntcnet + ---------------
V droop R sen ? R droop
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
1
(EQ. 25)
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
network.
The recommended values are R sum = 1k ? and C n = 5600pF.
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 45μA of I sum current or 56.25μA of droop current.
I droop is designed to be 45μA at full load, so the OCP trip level is
1.25x of the full load current.
For inductor DCR sensing, Equation 26 gives the DC relationship
of V cn (s) and I o (s):
Substitution of Equation 26 into Equation 1 gives Equation 27:
Therefore:
30
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 = 45μA. Equation 29
gives R i = 359 ? .
For resistor sensing, Equation 30 gives the DC relationship of
V cn (s) and I o (s).
(EQ. 30)
N
Substitution of Equation 30 into Equation 1 gives Equation 31:
1 R sen
N
Therefore:
(EQ. 32)
N ? I droop
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 ??
Load Line Slope
See Figure 14 for load-line implementation.
For inductor DCR sensing, substitution of Equation 27 into
Equation 2 gives the load-line slope expression in Equation 34:
LL = ------------------- = ------------------- ? ------------------------------------------ ? ------------- (EQ. 34)
N
N
For resistor sensing, substitution of Equation 31 into Equation 2
gives the load line slope expression in Equation 35:
LL = ------------------- = --------------------------------------- (EQ. 35)
I o N ? R i
March 7, 2012
FN8263.0
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