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LP5523 bảng dữ liệu(PDF) 45 Page - Texas Instruments

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tên linh kiện LP5523
Giải thích chi tiết về linh kiện  LP5523 Programmable 9-Output LED Driver
PDF  56 Pages
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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LP5523 bảng dữ liệu(HTML) 45 Page - Texas Instruments

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LP5523 INPUT
CURRENT 1 mA/DIV
PWM POWERSAVE
ENABLED
INPUT CURRENT ~50 éA
DURING PWM
POWERSAVE
LED CURRENT 5 mA/DIV
TIME 1 ms/DIV
LP5523
www.ti.com
SNVS550D – SEPTEMBER 2009 – REVISED MAY 2013
PWM Power-Save Mode
PWM cycle power-save mode is enabled when register 36 bit [2] PWM_PS_EN is set to “1”. In PWM power-save
mode analog blocks are powered down during the "down time" of the PWM cycle. Which blocks are powered
down depends whether the external or internal clock is used. While the Automatic Power-Save Mode (see
above) saves energy when there is no PWM activity at all, the PWM Power-Save mode saves energy during
PWM cycles. Like the Automatic Power-Save Mode, PWM Power-Save Mode also works during program
execution. Figure 27 shows the principle of the PWM power-save technique. An LED on D9 output is driven at
50%PWM, 5mA current (top waveform). After PWM Power-save enable, the LED-current remains the same, but
the LP5523 input current drops down to ~50 µA level when the LED is OFF, or to ~200 µA level when the
charge-pump-powered output(s) are used.
Figure 27. PWM Power-save Principle. External Clock, VDD = 3.6V
Copyright © 2009–2013, Texas Instruments Incorporated
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