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TPS658620ZQZT датащи(PDF) 69 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS658620ZQZT датащи(HTML) 69 Page - Texas Instruments

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3.57.5 OVERVOLTAGE PROTECTION
3.57.6 UNDER VOLTAGE LOCKOUT OPERATION
3.57.7 SM3 OUTPUT CURRENT - HIGH AND LOW CURRENT SETTINGS
3.58 RGB AND PWM DRIVERS
3.58.1 PWM PIN DRIVER
TPS658620
Advanced Power Management Unit
www.ti.com
SLVS993 – OCTOBER 2009
The output voltage of the boost converter is sensed at pin SM3, and the integrated power stage switch is
turned OFF when V(SM3) exceeds the internal over-voltage threshold V(OVP3). The converter returns to
normal operation when V(SM3) < V(OVP3) – VHYS(OVP3).
The power stage mosfet switch and the LED switch are open (off) when the TPS658620 enters the sleep
mode or if the SM3 converter is set to OFF mode.
A dedicated, open-drain pin (ISM3G) enables I2C selection of a low and high brightness setting for the
SM3 output current, by modifying the external FB3 resistor value. See application diagram for details. This
pin is configured as an open drain and it can be turned on/off with bit SM3_IGAIN on register SM3_SET1.
The TPS658620 has integrated open drain and push-pull drivers with programmable duty cycle and
frequency, targeted at driving external RGB drivers, keyboard LED's, vibrator motor and other system
peripherals.
Figure 3-20. RGB and PWM Driver Blocks
The TPS658620 offers one high current (150mA max) open-drain PWM driver. The PWM driver is enabled
when PWM_EN is 1 in register PWM.
Table 3-41. PWM Control
PWM [Addr 0x5B]
Default to 0
Bit
B7
B6
B5
B4
B3
B2
B1
B0
Number
Bit Name
PWM_EN
PWM_F[2]
PWM_F[1]
PWM_F[0]
PWM_D[3]
PWM_D[2]
PWM_D[1]
PWM_D[0]
Function
PWM DRIVER ON/OFF
PWM DRIVER FREQUENCY
PWM DRIVER DUTY CYCLE
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DETAILED DESCRIPTION
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