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参数资料
| 型号： | ISL6326CRZ |
| 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： | 0°C ~ 70°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 管件 |
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ISL6326
temperature coefficient, which is about +0.38%/°C. Since the
100
90
80
70
60
50
40
30
V TM /V CC vs TEMPERATURE
voltage across inductor is sensed for the 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. ISL6326 provides two methods:
1. Integrated temperature compensation
2. External temperature compensation
Integrated Temperature Compensation
When the TCOMP voltage is equal or greater than VCC/15,
20
0
20
40
60
80
100
120
140
ISL6326 will utilize the voltage at TM and TCOMP pins to
compensate the temperature impact on the sensed current.
TEMPERATURE (°C)
The block diagram of this function is shown in Figure 14.
FIGURE 12. THE RATIO OF TM VOLTAGE TO NTC
TEMPERATURE WITH RECOMMENDED PARTS
V CC
TM
0.39*V CC
0.33*V CC
R TM1
TM
NON-LINEAR
A/D
CHANNEL CURRENT
SENSE
ISEN4
ISEN3
ISEN2
ISEN1
0.28*V CC
°C
R NTC
I4
I3
I2
I1
VR_FAN
VR_HOT
TEMPERATURE
V CC
R TC1
D/A
ki
T1 T2 T3
FIGURE 13. VR_HOT AND VR_FAN SIGNAL vs TM VOLTAGE
TCOMP
4-BIT
A/D
DROOP AND
OVERCURRENT PROTECTION
R TC2
Based on the NTC temperature characteristics and the
desired threshold of the VR_HOT signal, the pull-up resistor
R TM1 of TM pin is given by Equation 17:
FIGURE 14. BLOCK DIAGRAM OF INTEGRATED
TEMPERATURE COMPENSATION
R TM1 = 2.75xR NTC ( T3 )
(EQ. 17)
When the TM NTC is placed close to the current sense
component (inductor), the temperature of the NTC will track
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 in Equations 18 and 19:
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, ISL6326 converts the TM pin voltage
R NTC ( T2 ) = 1.267xR NTC ( T3 )
R NTC ( T1 ) = 1.644xR NTC ( T3 )
(EQ. 18)
(EQ. 19)
to a 6-bit TM digital signal for temperature compensation.
With the non-linear A/D converter of ISL6326, the 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
With the NTC resistance value obtained from Equations 17
and 18, the temperature value T2 and T1 can be found from
the NTC datasheet.
Temperature Compensation
ISL6326 supports inductor DCR sensing, or resistive
sensing techniques. The inductor DCR has a positive
22
should be similar to that in Figure 12.
Depending on the location of the NTC and the airflow, the
NTC may be cooler or hotter than the current sense
component. The TCOMP pin voltage can be utilized to
correct the temperature difference between NTC and the
current sense component. When a different NTC type or
different voltage divider is used for the TM function, the
FN9262.1
May 5, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ISL6326IRZ-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 |
| ISL6327ACRZ | 功能描述:IC REG CTRLR BUCK PWM 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
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