TC646VPA Microchip Technology, TC646VPA Datasheet - Page 7

• Manufacturer Part Number: TC646VPA
• Description: IC PWM FAN SPD CNTRLR SD 8-DIP
• Manufacturer: Microchip Technology
• Type: Controller - PWM Fanr

Specifications of TC646VPA

• Applications: Fan Controller, Brushless (BLDC)
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Motor Type: DC Brushless
• No. Of Outputs: 1
• Output Current: 5mA
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: DIP
• 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: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: TC646VPAR; TC646VPAR

FIGURE 3-1:
3.7
If an unconditional shutdown and/or device reset is
desired, the TC646 may be placed in shutdown mode
by forcing V
Figure 3-1). In this mode, all functions cease and the
FAULT output is unconditionally inactive. The TC646
should not be shut down unless all heat producing
activity in the system is at a negligible level. The TC646
exits shutdown mode when V
V
Entering shutdown mode also performs a complete
device reset. Shutdown mode resets the TC646 into its
power-up state. The Start-up and Fault Timers, and any
current faults, are cleared. FAULT is unconditionally
inactive in shutdown mode. Upon exiting shutdown
mode (V
and normal operation will resume, assuming no fault
conditions exist and V
Note: If V
mode, the fan will not restart as it will be in auto-shut-
down mode.
V
REL
2002 Microchip Technology Inc.
AS
V
IN
TC646
Status
V
, the release voltage.
+ V
V
SHDN
GND
2.6V
REL
V
1.2V
HAS
AS
IN
Shutdown Mode (Reset)
> V
IN
IN
< V
REL
to a logic low (i.e., V
AS
), the Start-up Timer will be triggered
Operation
Normal
when the device exits shutdown
IN
TC646 Nominal Operation.
> V
AS
IN
+ V
becomes greater than
HAS
IN
< V
Auto-Shutdown
SHDN
Mode
) (see
Time
If a fan fault has occurred and the device has latched
itself into shutdown mode, performing a reset will not
clear the fault unless V
greater than (V
mode, the fan will not be restarted. Consequently, there
is no way to establish that the fan fault has been
cleared. To ensure that a complete reset takes place,
the user’s circuitry must ensure that V
when the device is released from shutdown mode. A
recommended algorithm for management of the TC646
by a host microcontroller or other external circuitry is
given in Section 5.0, “Typical Applications”. A small
amount of hysteresis, typically one percent of V
(50 mV at V
V
V
include this hysteresis plus adequate margin to
account for normal variations in the absolute value of
the threshold and hysteresis.
Operation
CAUTION: Shutdown mode is unconditional. That is,
the fan will remain off as long as the V
held low or V
REL
REL
Normal
threshold. The levels specified for V
in Section 1.0, “Electrical Characteristics”,
DD
IN
t
RESET
Down
Shut-
= 5.0V), is designed into the V
< V
AS
AS
+ V
+ V
IN
HAS
> (V
HAS
) upon exiting shutdown
Operation
Normal
.
AS
+ V
HAS
IN
DS21446C-page 7
TC646
IN
> (V
). If V
pin is being
AS
SHDN
LO
TEMP.
IN
HI
+ V
SHDN
is not
HAS
and
DD
)
/