参数资料
| 型号： | ISL6312CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 28/35页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 4PHASE BUCK 48-QFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，Intel VR10、VR11、AMD CPU |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 1 |
| 输出电压： | 0.38 V ~ 1.6 V |
| 工作温度： | 0°C ~ 70°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（7x7） |
| 包装： | 带卷 (TR) |
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ISL6312
Inductor DCR Current Sensing Component
Selection
The ISL6312 senses each individual channel’s inductor
2. Plug the inductor L and DCR component values, and the
value for C 1 chosen in step 1, into Equation 33 to
calculate the value for R 1 .
R 1 = -------------------------
current by detecting the voltage across the output inductor
DCR of that channel (as described in the “Continuous
L
DCR ? C 1
I OCP = I OCP , min
(EQ. 33)
R-C network is required to accurately sense the inductor
DCR voltage and convert this information into a current,
which is proportional to the total output current. The time
constant of this R-C network must match the time constant
of the inductor L/DCR.
3. Resistor R 2 should be left unpopulated.
If the desired overcurrent trip level, I OCP , is greater then the
minimum overcurrent trip level, I OCP,min , then a resistor
divider R-C circuit should be used to set the desired trip
level. Follow the steps below to choose the component
MOSFET
UGATE(n)
V IN
L
I
L
DCR
V OUT
values for the resistor divider R-C current sensing
network :
1. Choose an arbitrary value for C 1 . The recommended
value is 0.1 μ F.
DRIVER
LGATE(n)
INDUCTOR
V L (s)
V C (s)
R 1 C 1
C OUT
2. Plug the inductor L and DCR component values, the
value for C 1 chosen in step 1, the number of active
channels N, and the desired overcurrent protection level
I OCP into Equations 34 and 35 to calculate the values for
R 1 and R 2 .
L ? I OCP
C 1 ? 0.0375 ? N
ISL6312 INTERNAL CIRCUIT
R 2*
R 1 = ---------------------------------------
I OCP > I OCP , min
(EQ. 34)
L ? I OCP
C 1 ? ( I OCP ? DCR – 0.0375 ? N )
I n
R 2 = ----------------------------------------------------------------------------------
(EQ. 35)
SAMPLE
I SEN
+
-
V C (s)
R ISEN
ISEN-(n)
ISEN+(n)
*R 2 is OPTIONAL
Due to errors in the inductance or DCR it may be necessary
to adjust the value of R 1 and R 2 to match the time constants
correctly. The effects of time constant mismatch can be seen
in the form of droop overshoot or undershoot during the
initial load transient spike, as shown in Figure 19. Follow the
steps below to ensure the R-C and inductor L/DCR time
constants are matched accurately.
1. Capture a transient event with the oscilloscope set to
FIGURE 18. DCR SENSING CONFIGURATION
The R-C network across the inductor also sets the
overcurrent trip threshold for the regulator. Before the R-C
components can be selected, the desired overcurrent
protection level should be chosen. The minimum overcurrent
trip threshold the controller can support is dictated by the
DCR of the inductors and the number of active channels. To
about L/DCR/2 (sec/div). For example, with L = 1 μ H and
DCR = 1m Ω , set the oscilloscope to 500 μ s/div.
2. Record Δ V1 and Δ V2 as shown in Figure 19.
calculate the minimum overcurrent trip level, I OCP,min , use
Equation 32, where N is the number of active channels, and
Δ V 1
Δ V 2
I OCP , min = ---------------------------
DCR is the individual inductor ’s DCR.
0.0375 ? N
DCR
(EQ. 32)
V OUT
The overcurrent trip level of the ISL6312 cannot be set any
lower then the I OCP,min level calculated above. If the
minimum overcurrent trip level is desired, follow the
steps below to choose the component values for the
R-C current sensing network :
1. Choose an arbitrary value for C 1 . The recommended
value is 0.1μF.
28
I TRAN
Δ I
FIGURE 19. TIME CONSTANT MISMATCH BEHAVIOR
FN9289.6
February 1, 2011
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