TC649VOA Microchip Technology, TC649VOA Datasheet - Page 7
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TC649VOA
Manufacturer Part Number
TC649VOA
Description
IC PWM FAN SPD CONTRLR SD 8-SOIC
Manufacturer
Microchip Technology
Type
Controller - PWM Fanr
Datasheet
1.TC649EUA.pdf
(28 pages)
Specifications of TC649VOA
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
TC649VOA
Manufacturer:
MICROCHIP
Quantity:
12 000
Company:
Part Number:
TC649VOATR
Manufacturer:
MICROCHIP
Quantity:
12 000
4.0
The flowcharts describing the TC649’s behavioral
algorithm are shown in Figure 4-1. They can be
summarized as follows:
4.1
(1) Assuming the device is not being held in shutdown
(2) Turn V
(3) During this Start-up Timer, if a fan pulse is
(4) Activate the 32-cycle Start-up Timer one more
(5) Proceed to Fan Fault.
(6) End.
4.2
Normal Operation is an endless loop which may only
be exited by entering shutdown mode, auto-shutdown
mode or Fan Fault. The loop can be thought of as exe-
cuting at the frequency of the oscillator and PWM.
(1) Reset the missing pulse detector.
(2) Is TC649 in shutdown or auto-shutdown mode? If
(3) Drive V
(4) If a fan pulse is detected, branch back to the start
(5) If the missing pulse detector times out …
(6) Activate the 3-cycle Diagnostic Timer and look for
(7) Activate the 32-cycle Start-up Timer and look for
(8) Quit Normal Operation and go to Fan Fault.
(9) End.
2002 Microchip Technology Inc.
pulses; if a fan pulse is detected, branch back to
the start of the loop (1); if none are received…
a. V
b. FAULT is disabled.
c. Exit the loop and wait for V
cycle by cycle basis.
of the loop (1).
pulses; if a fan pulse is detected, branch back to
the start of the loop (1); if none are received…
or auto-shutdown mode (V
clock. This ensures that the fan will start from a
dead stop.
detected, branch to Normal Operation; if none are
received…
time and look for fan pulse; if a fan pulse is
detected, proceed to Normal Operation; if none
are received…
so…
resume operation.
OUT
SYSTEM BEHAVIOR
Power-Up
Normal Operation
OUT
OUT
duty cycle goes to zero.
output on for 32 cycles of the PWM
to a duty cycle proportional to V
IN
> V
IN
> (V
AS
)...
AS
+ V
HAS
IN
on a
) to
4.3
Fan Fault is an infinite loop wherein the TC649 is
latched in shutdown mode. This mode can only be
released by a reset (i.e., V
V
(1) While in this state, FAULT is latched on (low) and
(2) A reset sequence applied to the V
(3) End.
SHDN
the V
loop to Power-up.
, then above (V
Fan Fault
OUT
output is disabled.
AS
+ V
HAS
IN
) or by power-cycling).
being brought below
DS21449C-page 7
TC649
IN
pin will exit the