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
文件頁數(shù)： 23/28頁
文件大?。?/td> 478K
代理商： TC649VUA
TC649
DS21449C-page 4
2002 Microchip Technology Inc.
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
2.1
Analog Input (VIN)
The thermistor network (or other temperature sensor)
connects to the VIN input. A voltage range of 1.25V to
2.65V (typical) on this pin drives an active duty cycle of
0% to 100% on the VOUT pin. The TC649 enters shut-
down mode when VIN ≤ VSHDN. During shutdown, the
FAULT output is inactive, and supply current falls to
25 A (typical). The TC649 exits shutdown mode when
VIN ≥ VREL. See Section 5.0, “Typical Applications”, for
details.
2.2
Analog Output (CF)
CF is the positive terminal for the PWM ramp generator
timing capacitor. The recommended CF is 1 F for
30 Hz PWM operation.
2.3
Analog Input (VAS)
An external resistor divider connected to the VAS input
sets the auto-shutdown threshold. Auto-shutdown
occurs when VIN ≤ VAS. The fan is automatically
restarted when VIN ≥ (VAS + VHAS). See Section 5.0,
“Typical Applications”, for more details.
2.4
Ground (GND)
GND denotes the ground terminal.
2.5
Analog Input (SENSE)
Pulses are detected at the SENSE pin as fan rotation
chops the current through a sense resistor (RSENSE).
The absence of pulses indicates a fault. See
Section 5.0, “Typical Applications”, for more details.
2.6
Digital Output (FAULT)
The FAULT line goes low to indicate a fault condition.
When FAULT goes low due to a fan fault condition, the
device is latched in shutdown mode until deliberately
cleared or until power is cycled.
2.7
Digital Output (VOUT)
VOUT is an active high complimentary output that drives
the base of an external NPN transistor (via an appropri-
ate base resistor) or the gate of an N-channel
MOSFET. This output has asymmetrical drive (see
Section 1.0, “Electrical Characteristics”).
2.8
Power Supply Input (VDD)
VDD may be independent of the fan’s power supply
(see Section 1.0, “Electrical Characteristics”).
Pin No.
Symbol
Descriptiion
1VIN
Analog Input
2CF
Analog Output
3VAS
Analog Input
4
GND
Ground Terminal
5
SENSE
Analog Input
6FAULT
Digital (Open Collector) Output
7VOUT
Digital Output
8VDD
Power Supply Input
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