参数资料
型号: ISL6306CRZ-T
厂商: Intersil
文件页数: 25/33页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 40-QFN
标准包装: 4,000
PWM 型: 电压模式
输出数: 1
频率 - 最大: 275kHz
占空比: 66.7%
电源电压: 4.75 V ~ 5.25 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 40-VFQFN 裸露焊盘
包装: 带卷 (TR)
ISL6306
Temperature Compensation
100
90
80
70
60
50
40
30
V TM /V CC vs TEMPERATURE
ISL6306 supports inductor DCR sensing, MOSFET r DS(ON)
sensing, or resistive sensing techniques. Both inductor DCR
and MOSFET r DS(ON) have the positive temperature
coefficient, which is about +0.38%/°C. Because the voltage
across inductor or MOSFET is sensed for the output current
information, the sensed current has the same positive
temperature coefficient as the inductor DCR or MOSFET
r DS(ON) .
In order to obtain the correct current information, there
should be a way to correct the temperature impact on the
current sense component. ISL6306 provides two methods:
integrated temperature compensation and external
20
0
20
40
60
80
100
120
140
temperature compensation.
TEMPERATURE (°C)
FIGURE 15. THE RATIO OF TM VOLTAGE TO NTC
TEMPERATURE WITH RECOMMENDED PARTS
Integrated Temperature Compensation
When TCOMP voltage is equal or greater than VCC/15,
ISL6306 will utilize the voltage at TM and TCOMP pins to
compensate the temperature impact on the sensed current.
The block diagram of this function is shown in Figure 17.
TM
sense
0.39*V CC
0.33*V CC
0.28*V CC
VR_FAN
VR_HOT
TEMPERATURE (°C)
o c
V CC
R TM1
TM
R NTC
Non-linear
NON-LINEAR
A/D
CHANNEL
Channel current
CURRENT
SENSE
I 4 I 3 I 2
I 1
I sen4
I sen3
I sen2
I sen1
Droop &
T1 T2 T3
FIGURE 16. VR_HOT AND VR_FAN SIGNAL vs TM VOLTAGE
Based on the NTC temperature characteristics and the
desired threshold of VR_HOT signal, the pull-up resistor
RTM1 of TM pin is given by:
R TM1 = 2.75xR NTC ( T3 )
(EQ. 17)
V CC
R TC1
TCOMP
R TC2
D/A
4-BIT
4-bit
A/D
k i
DROOP AND OVERCURRENT
current
Over PROTECTION protection
R NTC(T3) is the NTC resistance at the VR_HOT threshold
temperature T3.
The NTC resistance at the set point T2 and release point T1
of VR_FAN signal can be calculated as:
FIGURE 17. BLOCK DIAGRAM OF INTEGRATED
TEMPERATURE COMPENSATION
When the TM NTC is placed close to the current sense
R NTC ( T2 ) = 1.267xR NTC ( T3 )
R NTC ( T1 ) = 1.644xR NTC ( T3 )
(EQ. 18)
(EQ. 19)
component (inductor or MOSFET), the temperature of the
NTC will track the temperature of the current sense
component. Therefore the TM voltage can be utilized to
obtain the temperature of the current sense component.
Based on VCC voltage, ISL6306 converts the TM pin voltage
With the NTC resistance value obtained from Equations 18
and 19, the temperature value T2 and T1 can be found from
the NTC datasheet.
25
to a 6-bit TM digital signal for temperature compensation.
With the non-linear A/D converter of ISL6306, TM digital
signal is linearly proportional to the NTC temperature. For
accurate temperature compensation, the ratio of the TM
voltage to the NTC temperature of the practical design
should be similar to that in Figure 15.
FN9226.1
May 5, 2008
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