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TMP815 Folha de dados(PDF) 7 Page - Texas Instruments

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Nome de Peças TMP815
Descrição Electrónicos  VARIABLE-SPEED SINGLE-PHASE FULL-WAVE FAN-MOTOR PRE-DRIVER
Download  13 Pages
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

TMP815 Folha de dados(HTML) 7 Page - Texas Instruments

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0 V
CPWM
FG
VTH voltage
RMI voltage
3 V
1.1 V
f = 30 kHz (CP = 220 pF)
PWM control
variable speed
Full speed
Rotation set to
minimum speed
(stop mode)
Low speed
High speed
ON Duty Cycle
100%
0%
TMP815
www.ti.com........................................................................................................................................................................................................ SLDS153 – MAY 2009
A.
Minimum speed setting (stop) mode. The low speed fan rotation occurs at the minimum speed set with the RMI pin.
When the minimum speed is not set (RMI pin pulled up to 5VREG), the motor stops.
B.
Low
↔ high speed. PWM control is made by comparing the CPWM oscillation voltage (1.1 V ↔ 3 V) and VTH
voltage. Both upper and lower output TRs are turned ON when the VTH voltage is low. The upper output TR is turned
OFF when the VTH voltage is high, regenerating the coil current in the lower TR. Therefore, as the VTH voltage
decreases, the output on duty cycle increases, causing an increase in the coil current, raising the motor rotation
speed. The rotation speed can be monitored with 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. The full-speed mode becomes effective when the VTH voltage is 1.1 V or less.
Set VTH = GND when the speed control is not used.
Figure 2. Speed Control Timing
Copyright © 2009, Texas Instruments Incorporated
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