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TMP815PWR 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 TMP815PWR
상세설명  Variable-Speed Single-Phase Full-Wave Fan-Motor Predriver
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제조업체  TI1 [Texas Instruments]
홈페이지  http://www.ti.com
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TMP815PWR 데이터시트(HTML) 9 Page - Texas Instruments

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TMP815
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SLDS153B – MAY 2009 – REVISED NOVEMBER 2015
Feature Description (continued)
7.3.3 Lock Detection
When the rotor is locked by external means or load conditions, The lock detection feature helps to protect the
circuit by not allowing the current to rise beyond control. A hiccup mechanism is also provided. The lock
detection is enabled by a connection to the lock detection capacitor (see *10 in Figure 5) The constant current
charge and discharge circuits cause drive stop when the pin voltage rises to 3 V and unlocking the drive when
pin voltage falls to 1.1 V. If lock detection feature is not desired in the application, this pin needs to be connected
to ground.
7.3.4 Current Limit
Current limit resistor is connected in a return path of H Bridge connection. This input is connected to the SENSE
pin where the Current is limited when the voltage across this resistor crosses 200-mV threshold. The device
enters in lower regeneration mode (see *8 in Figure 5) If not used, this pin needs to be connected to ground.
7.3.5 Minimum Speed Setting
Minimum speed setting (see *6 in Figure 5) feature is use with the RMI pin in the device. Connect to 5VREG with
a pullup resistor if not used.
7.3.6 Speed Output
The speed of the motor while running can be observed at the FG pin which is an open collector output and
needs to be pulled high for using it.
7.3.7 Drive Frequency Selection
The P channel switches in the device are switched with higher frequency whose duty cycle is decided by the
speed control input. The frequency of the operation can be decided by the capacitor connected at the CPWM
pin. As this is used also for the current limiting canceling signal, be sure to connect the capacitor even when
speed control is not used.
7.4 Device Functional Modes
Table 1. Drive Lock Truth Table (1) (2)
IN–
IN+
CT
OUT1P
OUT1N
OUT2P
OUT2N
FG
MODE
H
L
L
L
L
OFF
H
L
OUT1
→ 2 drive
L
H
L
OFF
H
L
L
OFF
OUT2
→ 1 drive
H
L
H
OFF
L
OFF
H
L
Lock protection
L
H
H
OFF
H
OFF
L
OFF
(1)
For VTH, RMI, and S-S pins, see Figure 2.
(2)
CPWM = H, VTH = RMI = S-S = L
Table 2. Speed Control Truth Table (1) (2)
VTH, RMI
CPWM
IN–
IN+
OUT1P
OUT1N
OUT2P
OUT2N
MODE
L
H
H
L
L
L
OFF
H
OUT1
→ 2 Drive
L
H
L
H
OFF
H
L
L
OUT2
→ 1 Drive
H
L
H
L
OFF
L
OFF
H
Regeneration mode
H
L
L
H
OFF
H
OFF
L
(1)
For VTH, RMI, and S-S pins, see Figure 2.
(2)
CT = S-S = L
Copyright © 2009–2015, Texas Instruments Incorporated
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