参数资料
型号: ISL6307BIRZ-T
厂商: Intersil
文件页数: 24/33页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 48-QFN
标准包装: 4,000
PWM 型: 电压模式
输出数: 6
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: -40°C ~ 85°C
封装/外壳: 48-VFQFN 裸露焊盘
包装: 带卷 (TR)
ISL6307B
VCC
V_IOUT, 200mV/DIV
R TM1
TM
0.33V CC
VR_FAN
VR_HOT
o c
R NTC
0.28V CC
0A
50A
100A
FIGURE 14. VOLTAGE AT IOUT PIN WITH A NTC NETWORK
PLACED BETWEEN IOUT TO GROUND WHEN
FIGURE 15. BLOCK DIAGRAM OF THERMAL MONITORING
FUNCTION
LOAD CURRENT CHANGES
V TM / V CC vs. Tem perature
Thermal monitoring (VR_HOT/VR_FAN)
There are two thermal signals to indicate the temperature
status of the voltage regulator: VR_HOT and VR_FAN. Both
VR_FAN and VR_HOT are open-drain output, and external
pull-up resistors are required.
VR_FAN signal indicates that the temperature of the voltage
regulator is high and more cooling airflow is needed.
VR_HOT signal can be used to inform the system that the
100%
90%
80%
70%
60%
50%
40%
temperature of the voltage regulator is too high and the CPU
should reduce its power consumption. VR_HOT signal may
be tied to the CPU’s PROCHOT# signal.
30%
20%
0
20
40 60 80 100
120
140
The diagram of thermal monitoring function block is shown in
Figure 15. One NTC resistor should be placed close to the
power stage of the voltage regulator to sense the operational
temperature, and one pull-up resistor is needed to form the
voltage divider for TM pin. As the temperature of the power
stage increases, the resistance of the NTC will reduce,
resulting in the reduced voltage at TM pin. Figure 16 shows
the TM voltage over the temperature for a typical design with
a recommended 6.8k ? NTC (P/N: NTHS0805N02N6801
from Vishay) and 1k ? resistor RTM1. We recommend using
those resistors for the accurate temperature compensation.
There are two comparators with hysteresis to compare the
TM pin voltage to the fixed thresholds for VR_FAN and
VR_HOT signals respectively. VR_FAN signal is set to high
Tem perature ( o C)
FIGURE 16. THE RATIO OF TM VOLTAGE TO NTC
TEMPERATURE WITH RECOMMENDED PARTS
TM
0.39*Vcc
0.33*Vcc
0.28*Vcc
VR_FAN
when TM voltage is lower than 33% of Vcc voltage, and is
pulled to GND when TM voltage increases to above 39% of
VR_HOT
Temperature
Vcc voltage. VR_HOT is set to high when TM voltage goes
below 28% of Vcc voltage, and is pulled to GND when TM
T1
T2
T3
voltage goes back to above 33% of Vcc voltage. Figure 17
shows the operation of those signals.
24
FIGURE 17. VR_HOTAND VR_FAN SIGNAL vs TM VOLTAGE
FN9225.0
March 9, 2006
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