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參數(shù)資料
| 型號： | L6910TR |
| 廠商： | 意法半導體 |
| 英文描述： | ADJUSTABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| 中文描述： | 可調(diào)降壓控制器采用同步整流 |
| 文件頁數(shù)： | 14/21頁 |
| 文件大?。?/td> | 453K |
| 代理商： | L6910TR |
L6910A L6910
14/21
Figure 12. Demo Board Efficiency @ V
in
= 5V
APPLICATION IDEA: 5V TO 12V INPUT; 3.3V / 25A OUTPUT
This is a typical application to replace the mag-amp in the silver box. The output voltage is programmed by the
switch to 3.3V and the maximum output current is of 25A DC. The power mosfet are configured with three
STS11NF30L (30V, 9m
typ @ V
gs
= 10V ) for high side and two of them for the low side.
Inductor selection
Since the maximum output current is 25A, to have a 20% ripple (5A) in worst case the inductor chosen is 1.1
μ
H.
An iron powder core (TO50-52B) with 6 windings has been chosen.
Output Capacitor
4 POSCAP capacitors, model 6TPB330M, are used, with a maximum ESR equal to 40m
each. Therefore the
resultant ESR is of 10m
. For load transient of 20A in the worst case the voltage drop is lower than 5%:
V
out
= 20 · 0.01 = 200mV
Input Capacitor
For I
OUT
= 25A and D = 0.5 (worst case for input ripple current), Irms is equal to 12.5A. Three OSCON electro-
lytic capacitors 6SP680M, with a maximum ESR equal to 13m
, are chosen to sustain the ripple. Therefore,
the resultant ESR is equal to 13m
/3 = 4.3m
. So the losses in worst case are:
P = ESR ·
= 670mW
Over-Current Protection
The peak current is in this case equal to 30A, substituting the demo board parameters in the relationship report-
ed in the relative section, (I
OCSMIN
= 170
μ
A; I
P
= 30A; R
DSONMAX
= 3m
) it results that R
OCS
= 530
.
60
65
70
75
80
85
90
95
0
2
4
6
8
10
Output Current [A]
E
Vout = 0.9V
Vout = 1.2V
Vout = 1.5V
Vout = 1.8V
Vout = 2.5V
Vout = 3.3V
I
rms
2
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| L6911 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE POWER SUPPLY CONTROLLER FOR PENTIUM II PROCESSOR |
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| L6911B | 制造商:STMicroelectronics 功能描述: |
| L6911C | 功能描述:DC/DC 開關(guān)控制器 5B PROGRAMMABLE STEP DOWN CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| L6911CTR | 功能描述:DC/DC 開關(guān)控制器 5B PROGRAMMABLE STEP DOWN CONTROLLER RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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