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參數(shù)資料
| 型號： | L6910TR |
| 廠商： | 意法半導(dǎo)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)： | 9/21頁 |
| 文件大小： | 453K |
| 代理商： | L6910TR |
9/21
L6910A L6910
Output Capacitor
The output capacitor is a basic component for the fast response of the power supply. In fact, during load tran-
sient, for first few microseconds they supply the current to the load. The controller recognizes immediately the
load transient and sets the duty cycle at 100%, but the current slope is limited by the inductor value. The output
voltage has a first drop due to the current variation inside the capacitor (neglecting the effect of the ESL):
A minimum capacitor value is required to sustain the current during the load transient without discharge it. The
voltage drop due to the output capacitor discharge is given by the following equation:
Where D
MAX
is the maximum duty cycle value that is 100%. The lower is the ESR, the lower is the output drop
during load transient and the lower is the output voltage static ripple.
Input Capacitor
The input capacitor has to sustain the ripple current produced during the on time of the upper MOS, so it must
have a low ESR to minimize the losses. The rms value of this ripple is:
Where D is the duty cycle. The equation reaches its maximum value with D = 0.5. The losses in worst case are:
Compensation network design
The control loop is a voltage mode (figure 7). The output voltage is regulated to the input Reference voltage
level (EAREF). The error amplifier output V
COMP
is then compared with the oscillator triangular wave to provide
a pulse-width modulated (PWM) wave with an amplitude of V
IN
at the PHASE node. This wave is filtered by the
output filter. The modulator transfer function is the small-signal transfer function of V
OUT
/V
COMP
. This function
has a double pole at frequency F
LC
depending on the L-C
out
resonance and a zero at F
ESR
depending on the
output capacitor ESR. The DC Gain of the modulator is simply the input voltage V
IN
divided by the peak-to-peak
oscillator voltage
V
OSC
.
V
OUT
I
OUT
ESR
=
V
OUT
I
2
L
2 C
OUT
V
INMIN
D
MAX
V
OUT
–
(
)
---------------------------------------------------------------------------------------------
=
I
rms
I
OUT
D
1
D
–
(
)
=
P
ESR I
rms
2
=
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| L6911D | 5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| L6911DTR | 5 BIT PROGRAMMABLE STEP DOWN CONTROLLER WITH SYNCHRONOUS RECTIFICATION |
| L6918 | 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| L6918A | 5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| L6911A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| 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(fēng)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(fēng)格: 封裝 / 箱體:CPAK |
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