TC646VOA Microchip Technology, TC646VOA Datasheet - Page 5

• Manufacturer Part Number: TC646VOA
• Description: IC PWM FAN SPD CNTRLR SD 8-SOIC
• Manufacturer: Microchip Technology
• Type: Controller - PWM Fanr

Specifications of TC646VOA

• Applications: Fan Controller, Brushless (BLDC)
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Motor Type: DC Brushless
• No. Of Outputs: 1
• Output Current: 5mA
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: SOIC
• No. Of Pins: 8
• Operating Temperature Range: 0°C To +85°C
• Product: Fan / Motor Controllers / Drivers
• Operating Supply Voltage: 3 V to 5.5 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

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
down mode when V
FAULT output is inactive, and supply current falls to
25 µA (typical). The TC646 exits shutdown mode
when V
Applications”, for details).
2.2
C
timing capacitor. The recommended C
30 Hz PWM operation.
1
2
3
4
5
6
7
8
Pin No.
F
2002 Microchip Technology Inc.
is the positive terminal for the PWM ramp generator
IN
Analog Input (V
Analog Output (C
PIN DESCRIPTIONS
V
Symbol
SENSE
FAULT
REL
V
GND
V
V
V
C
OUT
AS
DD
IN
F
(see Section 5.0, “Typical
IN
PIN FUNCTION TABLE
IN
input. A voltage range of 1.25V to
OUT
Analog Input
Analog Output
Analog Input
Digital (Open Collector) Output
Digital Output
Power Supply Input
Ground Terminal
Analog Input
V
pin. The TC646 enters shut-
SHDN
IN
. During shutdown, the
)
Description
F
)
F
is 1 µF for
2.3
An external resistor divider connected to the V
sets the auto-shutdown threshold. Auto-shutdown
occurs when V
restarted when V
“Typical Applications”, for more details).
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 (R
The absence of pulses indicates a fault (see
Section 5.0, “Typical Applications”, for more details).
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 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
Analog Input (V
Ground (GND)
Analog Input (SENSE)
Digital Output (FAULT)
Digital Output (V
Power Supply Input (V
IN
IN
V
(V
AS
AS
. The fan is automatically
+ V
AS
OUT
HAS
)
) (see Section 5.0,
)
DS21446C-page 5
TC646
DD
)
AS
SENSE
input
).