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參數(shù)資料
| 型號： | L6920DCTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | LEAD FREE, MSOP-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 401K |
| 代理商： | L6920DCTR |
L6920DC
Detailed description
7/16
5
Detailed description
The L6920DC is a high efficiency, low voltage step-up DC/DC converter particularly suitable
for 1 to 3 cells (Li-Ion/ polymer, NiMH respectively) battery up conversion.
These performances are achieved via a strong reduction of quiescent current (10
A only)
and adopting a synchronous rectification that implies also a reduced cost in the application
(no external diode required).
Operation is based on maximum ON time - minimum OFF time control.
A simplified block diagram is shown here below.
Figure 5.
Simplified block diagram
5.1
Principle of operation
In L6920DC the control is based on a comparator that continuously checks the status of
output voltage.
If the output voltage is lower than the expected value, the control function of the L6920DC
directs the energy stored in the inductor to be transferred to the load. This is accomplished
by alternating between two basic steps:
●
TON phase: the energy is transferred from the battery to the inductor by shorting LX
node to ground via the N-channel power switch. The switch is turned off if the current
flowing in the inductor reaches the current limit or after a maximum on time set to 5
s.
●
TOFF phase: the energy stored in the inductor is transferred to the load through the
synchronous switch for at least a minimum off time equal to 1
s. After this, the
synchronous switch is turned off as soon as the output voltage goes lower than the
regulated voltage or the current flowing in the inductor goes down to zero.
R
Q
S
Ton max
5
sec
Toff min
1
sec
VBG
A
B
C
-
+
-
+
-
+
-
+
-
+
VOUT
ZERO CROSSING
OPAMP
(CR)
CURRENT LIMIT
OUT
FB
GND
VREF
LBI
LBO
D99IN1041
SHDN
LX
VIN
VOUT
GND
R1,R2
FB
Y
A
B
C
- +
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6920DTR | 功能描述:直流/直流開關轉(zhuǎn)換器 0.6 to 5.5V Step-Up RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| L6922-1 | 制造商:Thomas & Betts 功能描述:3/4 CORD GRIP CONNECTOR,EA |
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| L6924D_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Battery charger system with integrated power switch for Li-ION/Li-POLYMER |
| L6924D013TR | 功能描述:電池管理 Battery Charger Sys Li-Ion/Li-Poly RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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