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参数资料
| 型号： | L6996DTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | MO-153AD, TSSOP-24 |
| 文件页数： | 14/26页 |
| 文件大小： | 272K |
| 代理商： | L6996DTR |
21/26
L6996
With our parameter:
CVP1 = 7.8pF
No-load offset is obtained by RVP3 and of a current source internally connected to VFB+ pin. Thus:
Eq 25
where IOFFSET =5A.
The capacitor CVP3 in parallel to RVP3 is a filter which time constant can be the same as in Eq22, so
Eq 26
3.8 Input divider
The input divider can be selected with the Eq1, Eq2, Eq3 . Choosing a switching frequency around 270kHz it
results:
αOSC = 0.048.
R1 = 560K
R2 = 27K
3.9 Current limit resistor
From the Eq12 it can be set the current limit resistor, for the positive current limit; it results:
R10 + R11 = 120K
The negative current limit is set by the time available for the negative dynamic transition; a value around 30K
for R10 is a match between negative peak current and time to end the dynamic transition (around 80mS).
R10=150KW
R11=30KW
3.10 Softstart capacitor
The soft start capacitor is selected once the soft start time is imposed. It can be consider a soft start time around
1ms. The soft start capacitor is given by:
Eq 27
Where
VSS is the soft start active range and T is the soft stat time. From Eq 28 results: CSS = 10nF.
R
VP3
V
OUT I
,
0
=
V
PR OG
–
I
OF F SE T
-----------------------------------------------------
1
R
VP2
R
VP1
--------------
1
+
------------------------
=
C
VP 3
ESR C
OUT
C
OUT
R
VP3
------------------------------------------------ -
=
C
SS
I
li m
T
V
ss
--------------------
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6997 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:STEP DOWN CONTROLLER FOR LOW VOLTAGE OPERATIONS |
| L6997-28 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT |
| L6997-5 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT; Accessory Type:Tuning Element; For Use With:High Quality Variable Reactance Tuning Microwave Cavities, Filters & other Resonant Structures |
| L6997-9 | 制造商:Johanson Manufacturing 功能描述:TUNING ELEMENT |
| L6997D | 功能描述:DC/DC 开关控制器 Adjustable Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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