参数资料
型号: ISL6307CRZ
厂商: Intersil
文件页数: 25/34页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 48-QFN
标准包装: 43
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: 0°C ~ 70°C
封装/外壳: 48-VFQFN 裸露焊盘
包装: 管件
ISL6307
VCC
VR_FAN
V_IOUT, 200mV/DIV
R TM1
TM
0.33V CC
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
LOAD CURRENT CHANGES
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
temperature of the voltage regulator is too high and the CPU
should reduce its power consumption. VR_HOT signal may
FIGURE 15. BLOCK DIAGRAM OF THERMAL MONITORING
FUNCTION
V TM / V CC vs. Tem perature
100%
90%
80%
70%
60%
50%
40%
30%
be tied to the CPU’s PROCHOT# signal.
The diagram of thermal monitoring function block is shown in
20%
0
20
40 60 80 100
Tem perature ( o C)
120
140
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
when TM voltage is lower than 33% of Vcc voltage, and is
pulled to GND when TM voltage increases to above 39% of
Vcc voltage. VR_HOT is set to high when TM voltage goes
below 28% of Vcc voltage, and is pulled to GND when TM
voltage goes back to above 33% of Vcc voltage. Figure 17
shows the operation of those signals.
25
FIGURE 16. THE RATIO OF TM VOLTAGE TO NTC
TEMPERATURE WITH RECOMMENDED PARTS
FN9224.0
March 9, 2006
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