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参数资料
| 型号： | L6919E |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 8/33页 |
| 文件大小： | 644K |
| 代理商： | L6919E |
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L6919E
16/33
Figure 10. Soft Start
INPUT CAPACITOR
The input capacitor is designed considering mainly the input RMS current that depends on the duty cycle as
reported in figure 11. Considering the dual-phase topology, the input RMS current is highly reduced comparing
with a single phase operation.
Figure 11. Input RMS Current vs. Duty Cycle (D) and Driving Relationships
It can be observed that the input rms value is one half of the single-phase equivalent input current in the worst
case condition that happens for D = 0.25 and D = 0.75.
The power dissipated by the input capacitance is then equal to:
Input capacitor is designed in order to sustain the ripple relative to the maximum load duty cycle. To reach the
high RMS value needed by the CPU power supply application and also to minimize components cost, the input
capacitance is realized by more than one physical capacitor. The equivalent RMS current is simply the sum of
the single capacitor's RMS current.
Input bulk capacitor must be equally divided between high-side drain mosfets and placed as close as possible
Timing Diagram
Acquisition:
(CH1=LGATEx; CH2=VCC; CH3=VOUT;
VCC=VCCDR
VLGATEx
PGOOD
VOUT
t
Turn ON threshold
2048 Clock Cycles
0.50
0.75
0.25
0.50
0.25
Single Phase
Dual Phase
Duty Cycle (VOUT/VIN)
R
m
s
Cu
rr
en
t
No
rm
a
liz
e
d
(I
RM
S
/I
OU
T
)
>
<
=
0.5
D
if
D)
2
(2
1)
-
(2D
2
OUT
I
5
.
0
D
if
D)
2
(1
2D
2
OUT
I
rms
I
P
RM S
ESR
I
RM S
()
2
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6919ETR | 功能描述:DC/DC 开关控制器 5-Bit Dual Ph Contlr 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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| L6920 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
| L6920D | 功能描述:直流/直流开关转换器 0.6 to 5.5V Step-Up RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| L6920DB | 功能描述:直流/直流开关转换器 Synchronous Rectifer Step Up Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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