參數(shù)資料
型號(hào)： TC648VOA
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO8
封裝： 0.150 INCH, PLASTIC, SOIC-8
文件頁(yè)數(shù)： 6/28頁(yè)
文件大?。?/td> 602K
代理商： TC648VOA
TC648
DS21448C-page 14
2002 Microchip Technology Inc.
FIGURE 5-7:
Powering the Fan from a -12V Supply.
5.5
Latch-up Considerations
As with any CMOS IC, the potential exists for latch-up
if signals are applied to the device which are outside
the power supply range. This is of particular concern
during power-up if the external circuitry (such as the
sensor network, VAS divider or shutdown circuit) are
powered by a supply different from that of the TC648.
Care should be taken to ensure that the TC648’s VDD
supply powers up first. If possible, the networks
attached to VIN and VAS should connect to the VDD sup-
ply at the same physical location as the IC itself. Even
if the IC and any external networks are powered by the
same supply, physical separation of the connecting
points can result in enough parasitic capacitance and/
or inductance in the power supply connections to delay
one power supply “routing” versus another.
5.6
Power Supply Routing and
Bypassing
Noise present on the VIN and VAS inputs may cause
erroneous operation of the OTF output. As a result,
these inputs should be bypassed with a 0.01 F capac-
itor mounted as close to the package as possible. This
is especially true of VIN, which is usually driven from a
high impedance source (such as a thermistor). Addi-
tionally, the VDD input should be bypassed with a 1 F
capacitor and grounds should be kept as short as pos-
sible. To keep fan noise off the TC648 ground pin, indi-
vidual ground returns for the TC648 and the low side of
the fan drive device should be used.
Auto-Shutdown Mode Design Example
Step 1. Calculate R1 and R2 based on using an NTC
having a resistance of 10 k
at TMIN (25°C)
and 4.65 k
at TMAX (45°C) (see Figure 5-8).
R1 = 20.5 k
R2 = 3.83 k
Step 2. Set auto-shutdown level.
VAS = 1.8V
Limit the divider current to 100 A
R5 = 33 k
R6 = 18 k
Step 3. Design the output circuit
Maximum fan motor current = 250 mA.
Q1 beta is chosen at 50 from which
R7 = 800 .
5.7
Minimum Speed Mode Design
Example
Given:
Minimum speed = 40%(1.8V)
TMIN = 30°C, TMAX = 95°C
Thermistor = 100 k
at 25°C
RTMIN = 79.4 k, RTMAX = 6.5 k
Step 1: Calculate R1:
R1 = 7.9 k (Use closest standard value:
7.87 k
)
Calculate R2:
R2 = 4.05 k (Use closest standard value:
4.02 k
)
Step 2: Verify VMAX:
VMAX = 2.64V
GND
+5V
-12V
Q1*
VDD
VOUT
TC648
Fan
R2*
2.2 k
R4*
D1
NOTE: *Value depends on the specific application and is shown for example only.
12.0V
Zener
10 k
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC648VOA 制造商:Microchip Technology Inc 功能描述:Fan Management Controller IC Package/Cas
TC648VOA713 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Over-T Alert 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
TC648VPA 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Over-T Alert 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
TC648VPA 制造商:Microchip Technology Inc 功能描述:Fan Management Controller IC
TC648VUA 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Over-T Alert 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube
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