参数资料
型号: ISL6336BCRZ
厂商: Intersil
文件页数: 23/31页
文件大小: 0K
描述: IC CTRLR PWM SYNC BUCK 48-QFN
标准包装: 43
应用: 控制器,Intel VR11.1
输入电压: 3 V ~ 12 V
输出数: 1
输出电压: 0.5 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: 管件
产品目录页面: 1248 (CN2011-ZH PDF)
ISL6336B
The NTC resistance at the set point T2 signal can be
calculated as:
VCC
R NTC ( t2 ) = 1.267xR NTC ( t3 )
R NTC ( t1 ) = 1.644xR NTC ( t3 )
(EQ. 21)
(EQ. 22)
With the NTC resistance value obtained from Equations 21
R
TM1
TM
VR_HOT
and 22, the temperature value t2 and t1 can be found from
the NTC datasheet.
Temperature Compensation
C
o
R
NTC
0.333V CC
ISL6336B supports inductor DCR sensing, or resistive
sensing techniques. The inductor DCR has a positive
temperature coefficient of about +0.385%/°C. Because the
FIGURE 14. BLOCK DIAGRAM OF THERMAL MONITORING
FUNCTION
100
90
80
70
60
50
40
30
voltage across inductor is sensed for output current
information, the sensed current has the same positive
temperature coefficient as the inductor DCR.
In order to obtain the correct current information, there
should be a way to correct the temperature impact on the
current sense component. The ISL6336B provides two
methods: integrated temperature compensation and external
temperature compensation.
Integrated Temperature Compensation
When the TCOMP voltage is equal to or greater than V CC /15,
ISL6336B will utilize the voltage at the TM and TCOMP pins to
compensate the temperature impact on the sensed current.
20
0
20
40
60
80
100
120
140
The block diagram of this function is shown in Figure 17.
TEMPERATURE (°C)
FIGURE 15. THE RATIO OF TM VOLTAGE TO NTC
TEMPERATURE WITH RECOMMENDED PARTS
V CC
I Sen6
TM
R TM1
TM
NON-LINEAR
A/D
CHANNEL
CURRENT
SENSE
I Sen5
I Sen4
I Sen3
I Sen2
0.391*V CC
0.333*V CC
o
c
R NTC
V CC
D/A
k i
I 6
I 5
I 4
I 3
I 2
I 1
I Sen1
VR_FAN
R TC1
VR_HOT
TEMPERATURE
TCOMP
4-BIT
A/D
DROOP IOUT AND
OVERCURRENT
t2 t3
FIGURE 16. VR_HOT SIGNAL vs TM VOLTAGE
R TC2
PROTECTION
Based on the NTC temperature characteristics and the
desired threshold of VR_HOT signal, the pull-up resistor
R TM1 of TM pin is given by Equation 20:
R TM1 = 2.75xR NTC ( t3 ) (EQ. 20)
R NTC(t3) is the NTC resistance at the VR_HOT threshold
temperature t3.
23
FIGURE 17. BLOCK DIAGRAM OF INTEGRATED
TEMPERATURE COMPENSATION
When the TM NTC is placed close to the current sense
component (inductor), the temperature of the NTC will track
the temperature of the current sense component. Therefore,
the TM voltage can be utilized to obtain temperature of the
current sense component.
FN6696.2
August 31, 2010
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