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参数资料
| 型号： | ISL8102EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 19/27页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 1 FOR ISL8102 |
| 标准包装： | 1 |
| 系列： | * |
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ISL8102
PVCC
BOOT
C GD
D
In certain circumstances, it may be necessary to adjust the
value of one or more ISEN resistors. When the components of
one or more channels are inhibited from effectively dissipating
their heat so that the affected channels run hotter than
R HI1
R LO1
UGATE
G
R G1
R GI1
C GS
C DS
Q1
desired, choose new, smaller values of R ISEN for the affected
phases (see “Channel Current Balance” on page 10 ).
Choose R ISEN,2 in proportion to the desired decrease in
temperature rise in order to cause proportionally less current
S
to flow in the hotter phase.
R ISEN , 2 = R ISEN ? ----------
PHASE
FIGURE 15. TYPICAL UPPER-GATE DRIVE TURN-ON PATH
Δ T 2
Δ T 1
(EQ. 24)
PVCC
C GD
D
In Equation 24, make sure that Δ T 2 is the desired temperature
rise above the ambient temperature, and Δ T 1 is the measured
temperature rise above the ambient temperature. While a
single adjustment according to Equation 24 is usually
R HI2
R LO2
LGATE
G
R G2
R GI2
C GS
S
C DS
Q2
sufficient, it may occasionally be necessary to adjust R ISEN
two or more times to achieve optimal thermal balance
between all channels.
Load Line Regulation Component Selection (DCR
Current Sensing)
For accurate load line regulation, the ISL8102 senses the
FIGURE 16. TYPICAL LOWER-GATE DRIVE TURN-ON PATH
Current Balancing Component Selection
The ISL8102 senses the channel load current by sampling
the voltage across the lower MOSFET r DS(ON) , as shown in
Figure 17. The ISEN pins are denoted ISEN1, and ISEN2.
The resistors connected between these pins and the
respective phase nodes determine the gains in the channel
current balance loop.
V IN
CHANNEL N
UPPER MOSFET
I L
ISEN(n)
R ISEN
total output current by detecting the voltage across the
output inductor DCR of each channel (As described in
“Load-Line (Droop) Regulation” on page 12). As Figure 18
illustrates, an R-C network is required to accurately sense
the inductor DCR voltage and convert this information into a
“droop” voltage, which is proportional to the total output
current.
Choosing the components for this current sense network is a
two step process. First, R COMP and C COMP must be
chosen so that the time constant of this R COMP -C COMP
network matches the time constant of the inductor L/DCR.
Then the resistor R S must be chosen to set the current
sense network gain, obtaining the desired full load droop
voltage. Follow the steps below to choose the component
values for this R-C network.
1. Choose an arbitrary value for C COMP . The recommended
value is 0.01μF.
I x r
R COMP = ---------------------------------------
ISL8102
CHANNEL N
LOWER MOSFET
-
+
L
DS ( ON )
2. Plug the inductor L and DCR component values, and the
values for C COMP chosen in step 1, into Equation 25 to
calculate the value for R COMP .
L
(EQ. 25)
DCR ? C COMP
FIGURE 17. ISL8102 INTERNAL AND EXTERNAL CURRENT-
SENSING CIRCUITRY
Select values for these resistors based on the room
3. Use the new value for R COMP obtained from Equation 25,
as well as the desired full load current, I FL , full load droop
voltage, V DROOP , and inductor DCR in Equation 26 to
R S = ------------------------- ? R COMP ? DCR
temperature r DS(ON) of the lower MOSFETs; the full-load
operating current, I FL ; and the number of phases, N using
Equation 23.
calculate the value for R S .
I FL
V DROOP
(EQ. 26)
R ISEN = ----------------------- ?
I FL
r DS ( ON )
50 ? 10 – 6
--------
N
19
(EQ. 23)
FN9247.1
July 28, 2008
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| ISL8103CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
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