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参数资料
| 型号： | ISL6307BCRZ-T |
| 厂商： | Intersil |
| 文件页数： | 25/33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： | 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： | 48-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6307B
Based on the NTC temperature characteristics and the
desired threshold of VR_HOT signal, the pull-up resistor
RTM1 of TM pin is given by:
V CC
I sen6
R TM1 = 2.75xR NTC ( T3 ) (EQ. 18)
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
o c
R TM1
TM
R NTC
Non-linear
A/D
I 6
Channel current sense
I 5 I 4 I 3 I 2
I 1
I sen5
I sen4
I sen3
I sen2
I sen1
of VR_FAN signal can be calculated as:
R NTC ( T2 ) = 1.267xR NTC ( T3 )
(EQ. 19)
V CC
D/A
k i
R TC1
R NTC ( T1 ) = 1.644xR NTC ( T3 )
(EQ. 20)
TCOMP
4-bit
A/D
Droop, Iout &
Over current protection
With the NTC resistance value obtained from Equations 19
& 20, the temperature value T2 and T1 can be found from
the NTC datasheet.
Temperature Compensation
ISL6307B supports inductor DCR sensing, MOSFET
R DS(ON) sensing, or resistive sensing techniques. Both
inductor DCR and MSOFET R DS(ON) have the positive
temperature coefficient, which is about +0.38%/°C. Because
the voltage across inductor or MOSFET is sensed for the
output current information, the sensed current has the same
positive temperature coefficient as the inductor DCR or
MOSFET R DS(ON) .
In order to obtain the correct current information, there
should be a way to correct the temperature impact on the
current sense component. ISL6307B provides two methods:
integrated temperature compensation and external
temperature compensation.
Integrated Temperature Compensation
When TCOMP voltage is equal or greater than Vcc/15,
ISL6307B will utilize the voltage at TM and TCOMP pins to
compensate the temperature impact on the sensed current.
The block diagram of this function is shown in Figure 18.
25
R TC2
FIGURE 18. BLOCK DIAGRAM OF INTEGRATED
TEMPERATURE COMPENSATION
When the TM NTC is placed close to the current sense
component (inductor or MOSFET), the temperature of the
NTC will track 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, ISL6307B converts the TM pin
voltage to a 6-bit TM digital signal for temperature
compensation. With the non-linear A/D converter of
ISL6307B, 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 should be similar to that in Figure 16.
Depending on the location of the NTC and the air-flowing,
the NTC may be cooler or hotter than the current sense
component. 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, TCOMP voltage
can also be used to compensate for the difference between
the recommended TM voltage curve in Figure 16 and that of
the actual design. According to the Vcc voltage, ISL6307B
converts the TCOMP pin voltage to a 4-bit TCOMP digital
signal as TCOMP factor N.
TCOMP factor N is an integer between 0 and 15. The
integrated temperature compensation function is disabled for
N = 0. For N = 4, the NTC temperature is equal to the
temperature of the current sense component. For N < 4, the
NTC is hotter than the current sense component. The NTC is
cooler than the current sense component for N > 4. When
N>4, the larger TCOMP factor N, the larger the difference
between the NTC temperature and the temperature of the
current sense component.
FN9225.0
March 9, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6307BIRZ | 功能描述:软开关 PWM 控制器 W/ANNEAL 6-PHS VR11 CNTRLR INDUSTRIAL RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6307BIRZ-T | 功能描述:软开关 PWM 控制器 W/ANNEAL 6-PHS VR11 CNTRLR INDUSTRIAL RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| ISL6307CRZ | 功能描述:IC REG CTRLR BUCK PWM VM 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) |
| ISL6307CRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 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) |
| ISL6307IRZ | 功能描述:IC REG CTRLR BUCK PWM VM 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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