参数资料
| 型号： | ISL6267HRZ |
| 厂商： | Intersil |
| 文件页数： | 26/33页 |
| 文件大小： | 0K |
| 描述： | IC PWM CTRLR MULTIPHASE 48TQFN |
| 标准包装： | 50 |
| 系列： | Robust Ripple Regulator™ (R³) |
| 应用： | 控制器，AMD Fusion? CPU GPU |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 2 |
| 输出电压： | 0.013 V ~ 1.55 V |
| 工作温度： | -10°C ~ 100°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： | 管件 |
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ISL6267
V Cn = ? ----------------------------------------- × ------------ ? × I o
N ?
R sum
?
waveforms on an actual board. R ip and C ip form an R-C branch in
parallel with R i , providing a lower impedance path than R i at the
beginning of i o change. R ip and C ip do not have any effect at
steady state. Through proper selection of R ip and C ip values,
i droop can resemble i o rather than i L , and V o will not ring back.
The recommended value for R ip is 100 Ω . C ip should be
determined through tuning the load transient response
waveforms on an actual board. The recommended range for C ip
is 100pF~2000pF. However, it should be noted that the R ip -C ip
branch may distort the i droop waveform. Instead of being
triangular as the real inductor current, i droop may have sharp
spikes, which may adversely affect i droop average value
detection and therefore may affect OCP accuracy. User discretion
is advised.
Resistor Current-Sensing Network
PHASE1 PHASE2 PHASE3
Overcurrent Protection
Refer to Equation 1 on page 20 and Figures 20, 24 and 26;
resistor R i sets the droop current, I droop . Tables 6 and 7 show the
internal OCP threshold. It is recommended to design I droop
without using the R comp resistor.
For example, the OCP threshold is 60μA for 3-phase solution.
I droop is designed to be 40.9μA at full load. Therefore the OCP
trip level is 1.5x of the full load current.
For inductor DCR sensing, Equation 27 gives the DC relationship
of V cn (s) and I o (s):
? ?
? R ntcnet DCR ?
(EQ. 27)
N
? R ntcnet + -------------- ?
Substitution of Equation 27 into Equation 1 gives Equation 28:
I droop = ----- × ----------------------------------------- × ------------ × I o
R sum
R i
L
L
L
2 R ntcnet DCR
N
R ntcnet + --------------
N
(EQ. 28)
R sum
+
DCR
RSEN
DCR
RSEN
DCR
RSEN
R SUM
R SUM
R SUM
VCN
CN
I SUM+
Therefore:
2R ntcnet × DCR × I o
R i = -------------------------------------------------------------------------------- (EQ. 29)
? N ?
N × ? R ntcnet + -------------- ? × I droop
Substitution of Equation 19 and application of the OCP condition
in Equation 29 gives Equation 30:
2 × --------------------------------------------------- × DCR × I omax
? ( R ntcs + R ntc ) × R p
R sum ?
N × ? --------------------------------------------------- + -------------- ? × I droopmax
R ntcs + R ntc + R p
? ?
R O
R O
R O
-
RI
I SUM-
( R ntcs + R ntc ) × R p
R ntcs + R ntc + R p
R i = -------------------------------------------------------------------------------------------------------------------------
N
(EQ. 30)
V Cn = ------------ × I o
R sen
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 24 thru 26 give the
V Cn (s) expression.
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 Ω , R p = 11k Ω , R ntcs = 2.61k Ω , R ntc = 10k Ω ,
DCR = 0.88m Ω , I omax = 51A and I droopmax = 40.9μA.
Equation 30 gives R i = 606 Ω .
For resistor sensing, Equation 31 gives the DC relationship of
V cn (s) and I o (s).
(EQ. 31)
N
V Cn ( s ) = ------------ × I o ( s ) × A Rsen ( s )
A Rsen ( s ) = ----------------------
1 + ------------
ω Rsen = ---------------------------
-------------- × C n
I droop = ----- × ------------ × I o
N
R i
2R sen × I o
R i = ---------------------------
R sen
N
1
R sum
N
1
s
ω sns
(EQ. 24)
(EQ. 25)
(EQ. 26)
Substitution of Equation 31 into Equation 1 gives Equation 32:
2 R sen
(EQ. 32)
Therefore:
(EQ. 33)
N × I droop
Substitution of Equation 33 and application of the OCP condition
N × I droopmax
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 Ω and
C n = 5600pF.
26
in Equation 29 gives Equation 34:
2R sen × I omax
R i = -------------------------------------- (EQ. 34)
where I omax is the full load current and I droopmax is the
corresponding droop current. For example, given N = 3,
R sen = 1m Ω , I omax = 51A and I droopmax = 40.9μA, Equation 34
gives R i = 831 Ω .
January 8, 2013
FN7801.1
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