參數(shù)資料
型號(hào)： TC649VUA
元件分類： 運(yùn)動(dòng)控制電子
英文描述： BRUSHLESS DC MOTOR CONTROLLER, PDSO8
封裝： PLASTIC, MSOP-8
文件頁(yè)數(shù)： 7/28頁(yè)
文件大?。?/td> 478K
代理商： TC649VUA
2002 Microchip Technology Inc.
DS21449C-page 15
TC649
5.6
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 TC649.
Care should be taken to ensure that the TC649’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.
5.7
Power Supply Routing and
Bypassing
Noise present on the VIN and VAS inputs may cause
erroneous operation of the FAULT output. As a result,
these inputs should be bypassed with a 0.01 F
capacitor mounted as close to the package as possible.
This is especially true of VIN, which is usually drive from
a high impedance source (such as a thermistor). Addi-
tionally, the VDD input should be bypassed with a 1 F
capacitor with grounds being kept as short as possible.
To keep fan noise off the TC649 ground pin, individual
ground returns for the TC649 and the low side of the
fan current sense resistor should be used.
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 5-9).
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 .
FIGURE 5-9:
Design Example.
FAULT
SENSE
NTC
10 k
@ 25C
R1
20.5 k
R2
3.83 k
R5
33 k
R7
800
GND
RESET
Shutdown
(Optional)
Q1
+12V
+5V
VDD
VIN
VAS
VOUT
RSENSE
2.2
CSENSE
0.1 F
C1
1 F
CF
TC649
Fan
Fan Fault
CB
0.01 F
CB
0.01 F
CB
1 F
1
8
4
6
7
5
2
3
R6
18 k
Open-
Drain
Device
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