参数资料
| 型号： | ISL6353IRTZ-T |
| 厂商： | Intersil |
| 文件页数： | 19/30页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER DDR VR12 40TQFN |
| 标准包装： | 6,000 |
| 应用： | 控制器，DDR，Intel VR12 |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.25 V ~ 1.52 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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ISL6353
The sensed current is used for current monitoring and overcurrent
ω L = ------------
protection.
DCR
L
(EQ. 7)
ω sns = ------------------------------------------------------
R ntcnet × --------------
----------------------------------------- × C n
Phase1
Phase2
Phase3
Rsum
Rsum
Rsum
ISUM+
1
R sum
N
N
R sum
R ntcnet + --------------
(EQ. 8)
where N is the number of phases.
L
DCR
L
DCR
L
DCR
Rntcs
Rntc
Ro
Rp
Cn Vcn
Ri
ISUM-
Transfer function A cs (s) always has unity gain at DC. The inductor
DCR value increases as the winding temperature increases,
giving higher a reading of the inductor DC current. The NTC R ntc
values decreases as its temperature increases. Proper selections
of R sum , R ntcs , R p and R ntc parameters ensure that V Cn
represents the total inductor DC current over the temperature
V Cn ( s ) = ? ----------------------------------------- × ------------ ? × I o ( s ) × A cs ( s )
R sum
N
? ?
C n = ------------------------------------------------------------
R ntcnet × --------------
N
Ro
Ro
Io
FIGURE 10. DCR CURRENT-SENSING NETWORK
Figure 10 shows the inductor DCR current-sensing network for a
3-phase regulator. Inductor current flows through the DCR and
creates a voltage drop. Each inductor has two resistors R sum and
R o connected to the pads to accurately sense the inductor current
by sensing the DCR voltage drop. The R sum and R o resistors are
connected in a summing network as shown, and feed the total
current information to the NTC network (consisting of R ntcs , R ntc
and R p ) and capacitor C n . R ntc is a negative temperature
coefficient (NTC) thermistor, used to compensate for the increase
in inductor DCR as temperature increases.
The inductor output pads are electrically shorted in the schematic,
but have some parasitic impedance in the actual board layout,
which is why the signals cannot simply be shorted together for the
current-sense summing network. A resistor from 1 Ω ~10 Ω for R o is
recommended to create quality signals. Since the R o value is much
smaller than the rest of the current sensing circuit, the following
analysis will ignore it for simplicity.
The summed inductor current information is represented at
capacitor C n . Equations 4 through 8 describe the
frequency-domain relationship between total inductor current
I o (s) and the C n voltage V Cn (s):
? ?
? R ntcnet DCR ?
(EQ. 4)
N
? R ntcnet + -------------- ?
range of interest.
There are many sets of parameters that can properly temperature-
compensate the DCR change. Since the NTC network and the R sum
resistors form a voltage divider, V cn is always a fraction of the
inductor DCR voltage. A higher ratio of V cn to the inductor DCR
voltage is recommended so the current monitor and OCP circuit has
a higher signal level to work with.
A typical set of parameters that provide good temperature
compensation are: R sum = 3.65k Ω , R p = 11k Ω , R ntcs = 2.61k Ω
and R ntc = 10k Ω (ERT-J1VR103J). The NTC network component
values may need to be fine tuned on actual boards. To help fine
tune the network apply a full load condition to the regulator and
record the IMON pin voltage reading immediately; then record the
IMON voltage reading again when the board has reached thermal
steady state. A good NTC network can limit the IMON voltage drift
to within 1% over the temperature range. If droop is used for the
ISL6353 based regulator the output voltage can be used for this
test rather than IMON. DDR memory regulators typically do not
operate with droop enabled. The Intersil evaluation board layout
and current-sensing network parameters can be referred to in
order to help minimize engineering time.
V Cn (s) needs to represent real-time I o (s) for the controller to
achieve best OCP and IMON response. The transfer function
A cs (s) has a pole ω sns and a zero ω L . ω L and ω sns should be
matched so A cs (s) is unity gain at all frequencies. By forcing ω L
equal to ω sns and solving for the solution, Equation 9 gives Cn
value .
L
R sum
(EQ. 9)
----------------------------------------- × DCR
N
R sum
R ntcnet + --------------
R ntcs + R ntc + R p
1 + ------
A cs ( s ) = ----------------------
1 + ------------
( R ntcs + R ntc ) × R p
R ntcnet = ---------------------------------------------------
s
ω L
s
ω sns
19
(EQ. 5)
(EQ. 6)
For example, given N = 3, R sum = 3.65k Ω , R p = 11k Ω ,
R ntcs = 2.61k Ω , R ntc = 10k Ω , DCR = 0.29m Ω and L = 0.22μH,
Equation 9 gives C n = 0.79μF.
C n is the capacitor used to match the inductor time constant.
Sometimes it takes the parallel combination of two or more
capacitors to get the desired value. To verify the capacitor value
is correct a repetitive load can be placed on the output voltage
and the IMON voltage can be monitored. The capacitor in parallel
with the IMON resistor needs to be removed for this test. The
September 15, 2011
FN6897.0
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