參數(shù)資料
型號(hào)： TK65431M
廠商： TOKO Inc.
英文描述： STEP-DOWN CONVERTER WITH BATTERY MONITOR
中文描述： 降壓轉(zhuǎn)換器與電池監(jiān)視器
文件頁(yè)數(shù)： 21/28頁(yè)
文件大?。?/td> 762K
代理商： TK65431M
September 1999 TOKO, Inc.
Page 21
TK654xx
ADVANCED INFORMATION
APPLICATION INFORMATION (CONT.)
New microprocessors are earnestly addressing this power issue by reducing the voltage. Battery manufacturers are
waking up right before the end of the century with the introduction of the “polymer electrolyte battery” which allows for higher
volumetric and gravimetric densities. Furthermore, these types of batteries come with much better form factors.
Unfortunately the wireless transmit and receive section of the portable system is very sensitive and requires very clean
analog voltages to keep a clean reception and transmission. This RF requirement reigns over the power management
section of the system and creates a dilemma to the system engineer. How do you extend the battery life with “efficient
switchers” when they are so “dirty” in performance compared to “l(fā)inears”
The industry has made attempts to get away from a sole linear system shown in Fig. 10 by considering a “PWM” switcher
in front of the linear as shown if Fig. 11.
The system of Fig. 10 has the advantage of very clean voltages for the RF section, but lacks high efficiency. Specifically
as the processor voltage drops and the battery makers refine the Li-Polimer battery (which ranges from 2.7V min to 4.2V
max).
The system of Fig. 11 has the advantage of high efficiency followed by clean RF due to the linears, but lacks the ability
to turn off (turn on) fast when the system is in standby operation. This is specifically due to the PWM architecture which
uses Continuous Conduction Mode (CCM) to build up the current in the coil.
WIRELESS PORTABLE SYSTEM USING PWM SWITCHER TO IMPROVE EFFICIENCY
FIGURE 11: PWM Switcher embedded to improve wireless system efficiency
Power
Amp
Enable A
Enable B
Enable C
μ Controller
Enable A
Enable B
Enable C
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TK65431MTL 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65431MTL/431 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65432 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65432M 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65432MTL 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR
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