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參數(shù)資料
| 型號： | TPS65820RSHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC56 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, QFN-56 |
| 文件頁數(shù)： | 76/98頁 |
| 文件大小： | 2290K |
| 代理商： | TPS65820RSHT |
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Enabling the SM3 Converter
Overvoltage Protection
Undervoltage Lockout Operation
Thermal Shutdown Operation
PWM DRIVERS
PWM Pin Driver
LED_PWM Pin Driver
LED_PWM,>50%DUTY CYCLE
LED_PWM,50%DUTY CYCLE
LED_PWM,<50%DUTY CYCLE
REPETITIONPERIOD
SLVS663B – MAY 2006 – REVISED APRIL 2008 .............................................................................................................................................................. www.ti.com
The SM3_SET I2C register controls the SM3 LED switch duty cycle. If the register is set to all zeros SM3 is set to
OFF mode. When the host writes a value other than 00 in SM3_SET the SM3 converter is enabled, entering the
soft start phase and then normal operation. The SM3 converter can operate with duty cycles varying from 0.4%
to 99.6%, with LED switch frequencies of 122 Hz or 180 Hz. The LED switch operating frequency is set by bit
SM3_LF, in the SOFT_RESET register.
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 overvoltage threshold VOVP3. The converter returns to normal operation
when V(SM3) < VOVP3 – VHYS(OVP3).
When the TPS65820 enters the UVLO mode, the SM3 converter is set to OFF mode with the power stage
MOSFET switch and the LED switch open (off).
When the TPS65820 enters the thermal shutdown mode, the SM3 converter is set to OFF mode with the power
stage MOSFET switch and the LED switch open (off).
The TPS65820 offers one low-frequency, open-drain PWM driver, capable of driving up to 150 mA. The PWM
frequency and duty cycle are defined by the PWM I2C register settings. The PWM parameters are set in I2C
register PWM. Available frequency values range from 500 Hz to 15 kHz, with 8 frequency values and 16 duty
cycle options (6.25% each).
The TPS65820 has another PWM driver output (pin LED_PWM), which is optimized to drive a backlight LED.
The LED_PWM driver controls the external LED current intensity using a pulse-width control method, with duty
cycle being set by the I2C register LED_PWM.
The pulse width method implemented generates a burst of high frequency pulses, with a pattern that is repeated
periodically. For a duty cycle of 50%, all of the high -frequency pulses have a 50% duty cycle. The duty cycle
control sets individual pulses to 100% duty cycle when increasing the LED_PWM output duty cycle; for
decreasing LED_PWM output duty cycles individual pulses are set to 0% duty cycle. An example of distinct duty
cycles is shown in Figure 56; the sum of the individual pulses on/off time over the repetition period is equivalent
to the duty cycle obtained with traditional single-pulse duty cycle circuits.
Figure 56. Example of Distinct Duty Cycles
The repetition period can be set using the register SOFT_RESET control bit SM3_LF_OSC to either 183 Hz (HI)
or 122 Hz (LO). Each repetition period has a total of 256 pulses, enabling a resoltuion of 0.4% when
programming the duty cycle. The LED_SET register enables control of the duty cycle via I2C, with duty cycle
ranging from 0.4% to 99.6%. Setting the LED_SET register to all zeros forces the LED_PWM pin to 0% duty
cycle (OFF).
78
Copyright 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65820
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