TC646EUA Microchip Technology, TC646EUA Datasheet - Page 10

• Manufacturer Part Number: TC646EUA
• Description: IC PWM FAN SPEED CTRLR 8-MSOP
• Manufacturer: Microchip Technology
• Type: Controller - PWM Fanr

Specifications of TC646EUA

• Applications: Fan Controller, Brushless (BLDC)
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Motor Type: PWM
• No. Of Outputs: 1
• Output Current: 5mA
• Output Voltage: 4.4V
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: MSOP
• No. Of Pins: 8
• Operating Temperature Range: -40°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
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TC646
5.0
Designing with the TC646 involves the following:
(1) The temperature
(2) The auto-shutdown temperature must be set
(3) The output drive transistor and associated circuitry
(4) The SENSE network, R
(5) If shutdown capability is desired, the drive require-
FIGURE 5-1:
DS21446C-page 10
Shutdown**
configured to deliver 1.25V to 2.65V on V
to 100% of the temperature range to be regulated.
with a voltage divider on V
must be selected.
be designed for maximum efficiency while
delivering adequate signal amplitude.
ments of the external signal or circuit must be
considered.
NOTES:
TYPICAL APPLICATIONS
*See cautions regarding latch-up considerations in Section 5.0, "Typical Applications".
**Optional. See Section 5.0, "Typical Applications", for details.
+5V*
Typical Application Circuit.
sensor network must be
+5V
R
R
1
2
SENSE
R
R
AS
3
4
.
and C
C
0.01 F
C
0.01 F
B
NTC
B
C
1 F
F
SENSE
1
2
3
C
IN
V
V
F
AS
IN
for 0%
, must
V
DD
TC646
8
GND
The TC642 demonstration and prototyping board
(TC642DEMO)
(TC642EV) provide working examples of TC646 cir-
cuits and prototyping aids. The TC642DEMO is a
printed circuit board optimized for small size and ease
of inclusion into system prototypes. The TC642EV is a
larger board intended for benchtop development and
analysis. At the very least, anyone contemplating a
design using the TC646 should consult the documen-
tation for both TC642EV (DS21403) and TC642DEMO
(DS21401). Figure 5-1 shows the base schematic for
the TC642DEMO.
4
C
1 F
B
SENSE
FAULT
V
OUT
6
7
5
and
the
2002 Microchip Technology Inc.
Thermal
Shutdown
C
SENSE
TC642
R
BASE
R
Evaluation
SENSE
+12V
Fan
Q
1
Kit