- 您現在的位置：買賣IC網 > PDF目錄361487 > TK65425M (TOKO Inc.) STEP-DOWN CONVERTER WITH BATTERY MONITOR PDF資料下載
參數資料
| 型號： | TK65425M |
| 廠商： | TOKO Inc. |
| 英文描述： | STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| 中文描述： | 降壓轉換器與電池監(jiān)視器 |
| 文件頁數： | 23/28頁 |
| 文件大?。?/td> | 762K |
| 代理商： | TK65425M |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁當前第23頁第24頁第25頁第26頁第27頁第28頁
September 1999 TOKO, Inc.
Page 23
TK654xx
ADVANCED INFORMATION
APPLICATION INFORMATION (CONT.)
Toko Inc. has come up with such a proprietary architecture implemented in their TK654XX switching step down converter.
This device is full of features as itemized in the following section:
TK654XX Features
1)
2)
Minimum pin count. Only 6 pins in a SOT23L package
Minimum external components required:
Coil and Filter cap
Synchronous Rectification
Extremely low operating current (25uA).
18uA Standby Currents
Internal power devices good for greater than 200mA loads
Inherent short circuit protection
No instabilities
Fast transient response
High efficiencies up to 95%
Regulation down to 1.8V
Proprietary architecture specifically aims at low ripple voltage.
Low Dropout operation (100% Duty Cycle)
Designed for battery operated equipment
Battery Monitor included
Easy to design with (Reduce the coil to increase the load current)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
Explanation of Figs. 10, 11, 12 follows:
Figure 10, shows a battery operated system with communications capability. The microcontroller is programmed to turn
on / off the Linear Low Dropout regulators (LDOs) at the appropriate time. This enabling capability is useful in extending
the battery life. Please note the LDO C, which powers the microcontroller is always active.
Figure 11, takes advantage of LDO C having to be active continuously and replaces it with a PWM step down controller.
Though the PWM is always active like the LDO C of Figure 10, the PWM is more efficient and therefore is penetrating the
Wireless market in order to increase battery life. It must be pointed out in Figure 11, the role of the LDOs is important to
maintain the clean voltages for Transmission and reception modes. Figure 11 also points out that if there is small activity
with the microcontroller which controls the other LDOs, the system could trip to the “Burst Mode” taunted by semiconductor
manufacturers. This mode is intended to reduce the current consumption of the PWM and
increase
the overall battery
life. Unfortunately, the speed that this Burst mode-to-PWM mode can react in is not very fast. Those systems, which are
compromised to increase response time, will inevitably hurt in ripple and therefore noise performance.
Figure 12, replaces the PWM with a Buck (step down) converter which has a unique architecture to respond very fast from
“Burst mode” to full load operation and a linear in parallel, rather than in series which can be enabled at the time the system
requires to transmit or receive. It is only due to the clean RF that the LDO is necessary. The majority of the time these
wireless systems are in a mode which can operate with some noise in the main voltage line. Some readers may have
noticed that Figure 12 only requires 1 LDO versus 3 LDOs in Figure 11. This principal may point out that the overall system
may turn out to be more cost effective. The system shown in Figure 12, therefore not only extends the overall battery life
by allowing the system to go into standby modes where the overall current is in the order of 25 uA, but at full load can run
in the 95% efficiency (no Transmission / Receive mode). Figure 12 can maintain the clean RF requirements for wireless
communications and reduce the overall cost.
相關PDF資料 |
PDF描述 |
|---|---|
| TK65425MTL | STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65426 | STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65427 | STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65427M | STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65427MTL | STEP-DOWN CONVERTER WITH BATTERY MONITOR |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TK65425MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65425MTL/425 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65426 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65426M | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR |
| TK65426MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-DOWN CONVERTER WITH BATTERY MONITOR |
發(fā)布緊急采購，3分鐘左右您將得到回復。