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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)： | 13/21頁 |
| 文件大?。?/td> | 453K |
| 代理商： | L6910TR |
13/21
L6910A L6910
Output Capacitor
In the demo 5 POSCAP capacitors, model 6TPB330M, are used, with a maximum ESR equal to 40m
each.
Therefore the resultant ESR is of 8m
. For load transient of 8A in the worst case the voltage drop is of:
V
out
= 8 · 0.008 = 64mV
The voltage drop due to the capacitor discharge during load transient, considering that the maximum duty cycle
is equal to 100% results in 16.4mV with 1.2V of programmed output.
Input Capacitor
For I
OUT
= 8A and D=0.5 (worst case for input ripple current), Irms is equal to 4A. Three OSCON electrolytic
capacitors 20SA100M, with a maximum ESR equal to 30m
, are chosen to sustain the ripple. Therefore, the
resultant ESR is equal to 30m
/3 = 10m
. So the losses in worst case are:
P = ESR ·
= 160mW
Over-Current Protection
The peak current is in this case equal to 12A, substituting the demo board parameters in the relationship report-
ed in the relative section, (I
OCSMIN
= 170
μ
A; I
P
= 12A; R
DSONMAX
= 9m
) it results that R
OCS
= 620
.
Table 1. Part List
R2
10k
R3
4.7k
R5
47k
R6
10
R7
620
R10
14k
R11
6.98k
R12
2.61k
R13
1.74k
C1
100
μ
C4…C11
330
μ
C12, C13, C15, C21
100n
C14
1n
C19
56n
L1
1.5
μ
L2
4.2
μ
U1
L6910
Q1, Q4
STS12NF30L
D1
1N4148
D2
STPS3340U
F1
251015A-15°
Efficiency
Figure 12 shows the measured efficiency versus load current for different values of output voltage. The measure
was done at V
in
= 5V for different values of the output voltage (0.9V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V). IC supply
voltage is of 12V.
In the application one mosfets STS12NF30L (30V, 10m
typ @ V
gs
= 4.5V) is used for both the low and the
high side.
Since the board has been layed out with the possibility to use up to three SO8 mosfets for both high and low
side switch, to increase efficiency at low output voltages, an additional mosfet on the low side can be considered
because of the duty cycle.
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
SMD 0805
Radial 10x10.5mm
SMD 7343
SMD 0805
SMD 0805
SMD 0805
1%
E96 1%
E96 1% (optional)
E96 1% (optional)
E96 1% (optional)
OSCON - 20SA100M
POSCAP - 6TPB330M
Ceramic
Ceramic
Ceramic
T44-52 Core, 7T-18AWG
SUMIDA CEE125 series
STMicroelectronics
STMicroelectronics
STMicroelectronics
STMicroelectronics
Littlefuse
SO16 NARROW
SO8
SOT23
SMB
AXIAL
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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