参数资料
| 型号： | ISL6326BIRZ |
| 厂商： | Intersil |
| 文件页数： | 22/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 275kHz |
| 占空比： | 25% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页当前第22页第23页第24页第25页第26页第27页第28页第29页第30页
ISL6326B
The diagram of thermal monitoring function block is shown in
Figure 11. 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 the TM pin. As the temperature of the
power stage increases, the resistance of the NTC will
reduce, resulting in the reduced voltage at the TM pin.
Figure 12 shows the TM voltage over the temperature for a
typical design with a recommended 6.8k Ω NTC (P/N:
NTHS0805N02N6801 from Vishay) and 1k Ω resistor RTM1.
We recommend using those resistors for the accurate
temperature compensation.
There are two comparators with hysteresis to compare the
100%
90%
80%
70%
60%
50%
40%
30%
20%
V TM / V CC vs. Tem perature
TM pin voltage to the fixed thresholds for VR_FAN and
VR_HOT signals respectively. The VR_FAN signal is set to
0
20
40 60 80 100
Tem perature ( o C)
120
140
high when the TM voltage is lower than 33% of VCC voltage,
and is pulled to GND when the TM voltage increases to
above 39% of VCC voltage. The VR_FAN signal is set to
high when the TM voltage goes below 28% of VCC voltage,
and is pulled to GND when the TM voltage goes back to
above 33% of VCC voltage. Figure 13 shows the operation
FIGURE 12. THE RATIO OF TM VOLTAGE TO NTC
TEMPERATURE WITH RECOMMENDED PARTS
TM
of those signals.
0.39*Vcc
0.33*Vcc
0.28*Vcc
VCC
VR_FAN
VR_FAN
VR_HOT
Temperature
R TM1
0.33V CC
T1
T2
T3
TM
VR_HOT
FIGURE 13. VR_HOT AND VR_FAN SIGNAL vs TM VOLTAGE
o c
R NTC
0.28V CC
Based on the NTC temperature characteristics and the
desired threshold of the VR_HOT signal, the pull-up resistor
RTM1 of TM pin is given by:
FIGURE 11. BLOCK DIAGRAM OF THERMAL MONITORING
R TM1 = 2.75xR NTC ( T3 )
(EQ. 18)
FUNCTION
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:
R NTC ( T2 ) = 1.267xR NTC ( T3 )
R NTC ( T1 ) = 1.644xR NTC ( T3 )
(EQ. 19)
(EQ. 20)
With the NTC resistance value obtained from Equations 19
and 20, the temperature value T2 and T1 can be found from
the NTC datasheet.
22
FN9286.0
April 21, 2006
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6326IRZ | IC REG CTRLR BUCK PWM VM 40-QFN |
| ISL6327AIRZ | IC REG CTRLR BUCK PWM 48-QFN |
| ISL6327IRZ | IC REG CTRLR BUCK PWM 48-QFN |
| ISL6328AIRZ | IC VOLTAGE REGULATOR |
| ISL6328IRZ | IC CTRLR PWM SYNC BUCK DL 48QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6326BIRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326CRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326CRZ-T | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR COM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL6326CRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6326CRZ-T W/GOLD BOND WIRE ONLY - Tape and Reel |
| ISL6326IRZ | 功能描述:电流型 PWM 控制器 W/ANNEAL 4-PHS VR11 CNTRLR IND RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
发布紧急采购，3分钟左右您将得到回复。