参数资料
型号: TC642VUA
元件分类: 运动控制电子
英文描述: BRUSHLESS DC MOTOR CONTROLLER, PDSO8
封装: PLASTIC, MSOP-8
文件页数: 7/28页
文件大小: 485K
代理商: TC642VUA
2002 Microchip Technology Inc.
DS21444C-page 15
TC642
5.7
Power Supply Routing and
Bypassing
Noise present on the VIN and VMIN 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 is possi-
ble. This is particularly true of VIN, which is usually
driven from a high impedance source (such as a ther-
mistor). In addition, the VDD input should be bypassed
with a 1 F capacitor. Grounds should be kept as short
as possible. To keep fan noise off the TC642 ground
pin, individual ground returns for the TC642 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 minimum fan speed VMIN = 1.8V.
Limit the divider current to 100 A from which
R5 = 33 k and 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
R6
18 k
R8
10 k
GND
Fan
Shutdown
(Optional)
Q1
Q2
+12V
+5V
VDD
VIN
VMIN
VOUT
RSENSE
2.2
CSENSE
0.1
F
C1
1
F
CF
TC642
Fan
CB
0.01 F
CB
0.01
F
+
CB
1
F
8
4
6
7
5
2
3
1
Fan/
Thermal Fault
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