TC642COA Microchip Technology, TC642COA Datasheet - Page 4

• Manufacturer Part Number: TC642COA
• Description: IC PWM FAN SPEED CONTRLR 8-SOIC
• Manufacturer: Microchip Technology
• Type: Controller - PWM Fanr

Specifications of TC642COA

• Package / Case: 8-SOIC (3.9mm Width)
• Operating Temperature: 0°C ~ 70°C
• Applications: Fan Controller, Brushless (BLDC)
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Product: Fan / Motor Controllers / Drivers
• Operating Supply Voltage: 6 V
• Supply Current: 1 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TC642
2.0
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
2.1
The thermistor network (or other temperature sensor)
connects to the V
2.65V (typical) on this pin drives an active duty cycle of
0% to 100% on the V
2.2
C
timing capacitor. The recommended C
30 Hz PWM operation.
2.3
An external resistor divider connected to the V
sets the minimum fan speed by fixing the minimum
PWM duty cycle (1.25V to 2.65V = 0% to 100%, typi-
cal). The TC642 enters shutdown mode when V
V
and supply current falls to 25 µA (typical). The TC642
exits shutdown mode when V
Section 5.0, “Typical Applications”).
DS21444C-page 4
Pin No.
1
2
3
4
5
6
7
8
SHDN
F
is the positive terminal for the PWM ramp generator
. During shutdown, the FAULT output is inactive
PIN DESCRIPTIONS
Analog Input (V
Analog Output (C
Analog Input (V
Symbol
SENSE
FAULT
V
GND
V
V
V
C
OUT
MIN
DD
IN
F
IN
PIN FUNCTION TABLE
input. A voltage range of 1.25V to
OUT
Analog Input
Analog Output
Analog Input
Ground Terminal
Analog Input
Digital (Open Collector) Output
Digital Output
Power Supply Input
pin.
IN
MIN
Description
)
F
)
)
MIN
F
is 1 µF for
V
REL
MIN
MIN
input
(see
2.4
GND denotes the ground terminal.
2.5
Pulses are detected at the SENSE pin as fan rotation
chops the current through a sense resistor. The
absence of pulses indicates a fault.
2.6
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. FAULT may be con-
nected to V
will also be asserted when the PWM reaches 100%
duty cycle, indicating that maximum cooling capability
has been reached and a possible over-temperature
condition may occur. This is a non-latching state and
the FAULT output will go high when the PWM duty
cycle goes below 100%.
2.7
V
the base of an external NPN transistor (via an appropri-
ate base resistor) or the gate of an N-channel MOS-
FET. This output has asymmetrical drive (see
Section 1.0, “Electrical Characteristics”).
2.8
V
(see Section 1.0, “Electrical Characteristics”).
OUT
DD
may be independent of the fan’s power supply
is an active high complimentary output that drives
Ground (GND)
Analog Input (SENSE)
Digital Output (FAULT)
Digital Output (V
Power Supply Input (V
MIN
if a hard shutdown is desired. FAULT
2002 Microchip Technology Inc.
OUT
)
DD
)