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參數(shù)資料
| 型號： | MAX6643LBFAEE+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 6/17頁 |
| 文件大小： | 208K |
| 描述： | IC CTLR PWM FAN-SPEED 16QSOP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 100 |
| 功能： | 風扇控制，溫度監(jiān)控器 |
| 傳感器類型： | 內(nèi)部和外部 |
| 感應溫度： | -40°C ~ 125°C，外部傳感器 |
| 精確度： | ±3.5°C 本地（最大），±3°C 遠程（最大） |
| 拓撲： | ADC，PWM 發(fā)生器，轉(zhuǎn)速計計數(shù)器 |
| 輸出類型： | PWM |
| 輸出警報： | 是 |
| 輸出風扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-QSOP |
| 包裝： | 管件 |
There are two options for the behavior of the PWM out-
puts at power-up. Option 1 (minimum duty cycle = 0):
at power-up, the PWM duty cycle is zero. Option 2
(minimum duty cycle = the start duty cycle): at power-
up, there is a startup delay, after which the duty cycle
goes to 100% for the spin-up period. After the startup
delay and spin-up, the duty cycle drops to its minimum
value. The minimum duty cycle is in the 0% to 50%
range (see the Selector Guide).
To control fan speed based on temperature, T
HIGH
is
set to the temperature beyond which the fan should spin
at 100%. T
LOW
is set to the temperature below which
the duty cycle can be reduced to its minimum value.
After power-up and spin-up (if applicable), the duty
cycle reduces to its minimum value (either 0% or the
start duty cycle). For option 1 (minimum duty cycle = 0),
if the measured temperature remains below T
HIGH
, the
duty cycle remains at zero (see Figure 1). If the temper-
ature increases above T
HIGH
, the duty cycle goes to
100% for the spin-up period, and then goes to the start
duty cycle (for example, 40%). If the measured temper-
ature remains above T
HIGH
when temperature is next
measured (4s later), the duty cycle begins to increase,
incrementing by 1.5% every 4s until the fan is spinning
fast enough to reduce the temperature below T
HIGH
.
For option 2 (minimum duty cycle = start duty cycle), if
the measured temperature remains below T
HIGH
, the
duty cycle does not increase and the fan continues to
run at a slow speed. If the temperature increases
above T
HIGH
, the duty cycle begins to increase, incre-
menting by 1.5% every 4s until the fan is spinning fast
enough to reduce the temperature below T
HIGH
(see
Figure 2). In both cases, if only a small amount of extra
cooling is necessary to reduce the temperature below
Automatic PWM Fan-Speed Controllers with
Overtemperature Output
6 _______________________________________________________________________________________
Table 2. Setting T
LOW
(MAX6643 and MAX6644)
STARTUP
TIME
TIME
T
HIGH
SPIN-UP
T
LOW
Figure 1. Temperature-Controlled Duty-Cycle Change with
Minimum Duty Cycle 30%
STARTUP
MAX664_B HAS 30% PWM_OUT DUTY CYCLE DURING STARTUP.
TIME
TIME
T
HIGH
T
LOW
SPIN-UP
Figure 2. Temperature-Controlled Duty-Cycle Change with
Minimum Duty Cycle 30%
TL2
TL1
T
LOW
(癈)
L SUFFIX
0
0
15
0
High-Z
20
0
1
25
High-Z
0
30
High-Z
High-Z
35
High-Z
1
40
1
0
45
1
High-Z
50
1
1
55
High-Z = High impedance.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6643LBFAEE+ | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Automatic PWM Fan Speed Controller RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| MAX6643LBFAEE+T | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Automatic PWM Fan Speed Controller RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| MAX6643LBFAEE-T | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6644LBAAEE | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6644LBAAEE+ | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Automatic PWM Fan Speed Controller RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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