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TMP816 Datasheet(PDF) 6 Page - Texas Instruments

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No. de pieza TMP816
Descripción Electrónicos  VARIABLE-SPEED SINGLE-PHASE FULL-WAVE FAN-MOTOR PRE-DRIVER
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TMP816 Datasheet(HTML) 6 Page - Texas Instruments

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0 V
CPWM
V
CC
FG
0 V
VTH voltage
RMI voltage
4.55 V
1.65 V
PWM-IN disconnected
ON duty small
f = 25 kHz (CP = 100 pF)
ON duty large
PWM control
variable speed
Full speed
12 V
Rotation set to
minimum speed
(stop mode)
Low speed
High speed
TMP816
SLVS787 – MAY 2009 ........................................................................................................................................................................................................ www.ti.com
A.
Minimum speed setting (stop) mode
PWM-IN input is filtered to generate the VTH voltage. At low speed, the fan rotates with the minimum speed set with
RMI during low speed. If the minimum speed is not set (RMI = 6VREG), the fan stops.
B.
Low
↔ high speed mode
PWM control is made through comparison of oscillation and VTH voltages with CPWM changing between 1.6 V
↔ 4.6
V.
Upper and lower TRs are turned ON when the VTH voltage is higher. The upper output TR is turned OFF when the
VTH voltage is lower, and the coil current is regenerated in the lower TR. Therefore, as the VTH voltage lowers, the
output ON duty increases, increasing the coil current and raising the motor speed. The rotation speed is fed back by
the FG output.
C.
Full speed mode
The full-speed mode becomes effective with the VTH voltage of 1.65 V or less. (VTH must be equal to GND when the
speed control is not used.)
D.
PWM-IN input disconnection mode
When the PWM-IN input pin is disconnected, VTH becomes 1.65 V or less and the output enables full drive at 100%.
The fan runs at full speed (see Figure 1).
Figure 2. Control Timing
6
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